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(F?tIENDB`? %/0REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$( Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t   +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lu: ": "" 9CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGEB:    JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,    5External Factors Influencing Growth of MicroorganismsWInitial Microorganism Population. Characteristics of the Food Effects Of Processing. LX!$$$$$ Initial Microorganism Population!!The type and number of microorganisms present during refrigerated storage is important in determining shelf life in refrigerated foods. In general, more microbes present initially results in decreased storage life. Characteristics of the FoodFactors influencing shelf life of refrigerated foods Water activity pH nutrient content for microbial growth preservative content Low pH, low water activity, and proper formulation can lengthen refrigerated storage time of foods. .5Effects Of ProcessingTemperature Pretreatment (i.e., pasteurization) pH adjustment Drying (reducing water activity) Addition of preservatives Storage atmosphere. Refrigerated storage is focused on spoilage bacteria, however pathogens may be present. X !DETERIORATION OF PRODUCT QUALITY " Chemical Reactions Lipid Oxidation/Maillard Browning Biochemical Reactions Enzymic Browning Glycolysis/Poteolysis/Lipolysis. Physicochemical Reactions or Processes Component Migration/Phase Change. Nutritional Changes in Refrigerated Foods 73'N!"1'"!+b$!   xLipid OxidationaIn meats, poultry, dairy,fish products ,lipid oxidation is a significant quality factor during refrigerated storage. Lipid oxidation causes a characteristic oxidized flavor, or rancidity, through a complex series of reactions. Degree of unsaturation of fatty acids, their availability, and the presence of activators or inhibitors are primary factors affecting the rate of lipid oxidation. Lipid oxidation can be prevented using the following techniques: addition of antioxidants, modified atmosphere storage (exclusion of oxygen), or vacuum packaging. the rate of lipid oxidation decreases with temperature. bZb i Maillard Browning This complex chemical reaction between reducing sugars and proteins, leading to brown discoloration, may also occur at refrigerated temperatures. However, the rate of Maillard browning is significantly reduced at low temperature$ 6!Enzymic Browning Enzymic browning occurs in fruits and vegetables after bruising or process preparations, such as cutting, peeling, or slicing. Phenolases contained within the tissue react with phenolic compounds in the presence of oxygen to produce a yellowish--brown pigment. The rate and extent of browning depends on the enzyme content the type of product pH, availability of oxygen, packaging conditions, and presence of inhibitors. Vacuum packaging or modified atmosphere packaging, and addition of inhibitors such as sulphites, citric acid, or ascorbic acid, can greatly reduce the effects of browning, typically, enzyme reactions are reduced at low temperature. $ZZHw ' A " Glycolysis  In living tissue, breakdown of glycogen is an important aspect of cell function and structure. After harvest or slaughter, this process still takes place, but changes in oxygen content direct this reaction to different end points, which cause breakdown of tissues and softening of structure, among other things. As with all biochemical reactions, the rate of glycolysis is decreased at refrigeration temperatures, and physical changes associated with continued ripening are slowed.  f s# Proteolysis  Proteases present in foods can alter flavor and texture of many products, including meat and fish, dairy products, and cheese. These enzymes attack protein matter in the food, breaking them down into peptides or shorter chain amino acid sequences. Many of these peptides contribute greatly to flavor changes during storage, while stiffness or texture may also be affected. In meats, for example, proteolysis is in part responsible for softening of tissue after slaughter. This process may take place over a 2 to 5week period in refrigerated storage. In cheese, proteolysis is thought to contribute to generation of characteristic flavors through release of peptides from casein. Z$  Lipolysis  Lipases, whether already present or added as part of a product formulation, catalyse hydrolysis of triacylglycerols into fatty acids and other glyceride breakdown products (mono- and diglycerides). Since many fatty acids have characteristic flavors and odors, some of them unpleasant lipolysis causes loss of product quality. An exception to this occurs in certain types of cheeses, where these lipid breakdown products enhance the flavor of the final product after ripening. 0ZZbK   X %!Component Migrationqmigration of components can cause changes to product quality. The most important and mobile food component is water. Foods may either pick up or lose moisture from the environment, depending on storage conditions and product characteristics. Moisture migration between structural elements in a food, as in pizza crust and tomato sauce in a refrigerated pizza, can also occur and cause loss of product quality The rate of moisture migration depends on the differences in water activity or vapor pressure, Appropriate packaging (vacuum packaging and moisture barriers) can greatly reduce rates of drying of refrigerated foods. $qZZr&" Phase Change In some products, phase changes occurring slowly over time can cause loss of product quality due to associated physical changes. Staling of bread involves slow crystallization of elements of the starch molecule and is thought to lead to firming of the bread matrix. Other examples of phase changes influencing storage life in refrigerated foods include blooming of chocolates and hardening of butter due to lipid crystallization at low temperatures. 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(F?tIENDB`? %":REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$( Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t   +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lu: ": "" 9CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGEB:    JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,    5External Factors Influencing Growth of Microorgani  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghsjklmnopqrstuvwxyz{|}~4PowerPoint Document(i<DocumentSummaryInformation8 SOes New Roman\bbv 0b( 0g DWingdingsRoman\bbv 0b( 0g0DArialngsRoman\bbv 0b( 0g" `(.  @n?" dd@  @@`` ZR/&        !"#%&b$$ M."S.b$n3!ߞ"dx S.R$4/h =W.b$|MX@Qr`_[i.b$WB0+|iE!hy.b$wp]G.b$AͰRT2 9R.b$O\$޸=i|:].b$}yz( g)X1.b$'Hڜt*$TyȱZ.b$xS>uCHPLTE{{{BBBkkk)1199)))cccsssޜRRR֥֭֜{ΜkΥ絜cRBcBB99ZZZJJJ﵄kƌkƌέZ{9!11ƜBƵޥBc!JΥ9{9޵ƌcƌZRΔέkΌRﵵs9ֵֽƜJ΄1Z޵Ɣ޽{έJs)!sֵֽ֥kJ֭sνΥJBZ9Ɣc tRNS0J cmPPJCmp0712-4IDAT(I+)eh80R(R qPROʖq"1<` ##LUuvE$b6ۧ|\ѥ.׍eUTBfӘ/B:@.޳ 9ՆFz;}q6ZGwB?N(Ơoue>yToew߀Bd2=߯QKD Au[ 4Y+21R*PȺ DCUs*ScLvSMIENDB`n5ߢ:DwA]PNG  IHDR lΤPLTEffStRNS0J cmPPJCmp0712Om"IDATc01`! (F?tIENDB`? %87REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$( Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t   +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lu: ": "" 9CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGEB:    JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,    5External Factors Influencing Growth of MicroorganismsWInitial Microorganism Population. Characteristics of the Food Effects Of Processing. LX!$$$$$ Initial Microorganism Population!!The type and number of microorganisms present during refrigerated storage is important in determining shelf life in refrigerated foods. In general, more microbes present initially results in decreased storage life. Characteristics of the FoodFactors influencing shelf life of refrigerated foods Water activity pH nutrient content for microbial growth preservative content Low pH, low water activity, and proper formulation can lengthen refrigerated storage time of foods. .5Effects Of ProcessingTemperature Pretreatment (i.e., pasteurization) pH adjustment Drying (reducing water activity) Addition of preservatives Storage atmosphere. Refrigerated storage is focused on spoilage bacteria, however pathogens may be present. X !DETERIORATION OF PRODUCT QUALITY " Chemical Reactions Lipid Oxidation/Maillard Browning Biochemical Reactions Enzymic Browning Glycolysis/Poteolysis/Lipolysis. Physicochemical Reactions or Processes Component Migration/Phase Change. Nutritional Changes in Refrigerated Foods 73'N!"1'"!+b$!   xLipid OxidationaIn meats, poultry, dairy,fish products ,lipid oxidation is a significant quality factor during refrigerated storage. Lipid oxidation causes a characteristic oxidized flavor, or rancidity, through a complex series of reactions. Degree of unsaturation of fatty acids, their availability, and the presence of activators or inhibitors are primary factors affecting the rate of lipid oxidation. Lipid oxidation can be prevented using the following techniques: addition of antioxidants, modified atmosphere storage (exclusion of oxygen), or vacuum packaging. the rate of lipid oxidation decreases with temperature. bZb i Maillard Browning This complex chemical reaction between reducing sugars and proteins, leading to brown discoloration, may also occur at refrigerated temperatures. However, the rate of Maillard browning is significantly reduced at low temperature$ 6!Enzymic Browning Enzymic browning occurs in fruits and vegetables after bruising or process preparations, such as cutting, peeling, or slicing. Phenolases contained within the tissue react with phenolic compounds in the presence of oxygen to produce a yellowish--brown pigment. The rate and extent of browning depends on the enzyme content the type of product pH, availability of oxygen, packaging conditions, and presence of inhibitors. Vacuum packaging or modified atmosphere packaging, and addition of inhibitors such as sulphites, citric acid, or ascorbic acid, can greatly reduce the effects of browning, typically, enzyme reactions are reduced at low temperature. $ZZHw ' A " Glycolysis  In living tissue, breakdown of glycogen is an important aspect of cell function and structure. After harvest or slaughter, this process still takes place, but changes in oxygen content direct this reaction to different end points, which cause breakdown of tissues and softening of structure, among other things. As with all biochemical reactions, the rate of glycolysis is decreased at refrigeration temperatures, and physical changes associated with continued ripening are slowed.  f s# Proteolysis  Proteases present in foods can alter flavor and texture of many products, including meat and fish, dairy products, and cheese. These enzymes attack protein matter in the food, breaking them down into peptides or shorter chain amino acid sequences. Many of these peptides contribute greatly to flavor changes during storage, while stiffness or texture may also be affected. In meats, for example, proteolysis is in part responsible for softening of tissue after slaughter. This process may take place over a 2 to 5week period in refrigerated storage. In cheese, proteolysis is thought to contribute to generation of characteristic flavors through release of peptides from casein. Z$  Lipolysis  Lipases, whether already present or added as part of a product formulation, catalyse hydrolysis of triacylglycerols into fatty acids and other glyceride breakdown products (mono- and diglycerides). Since many fatty acids have characteristic flavors and odors, some of them unpleasant lipolysis causes loss of product quality. An exception to this occurs in certain types of cheeses, where these lipid breakdown products enhance the flavor of the final product after ripening. 0ZZbK   X %!Component Migrationqmigration of components can cause changes to product quality. The most important and mobile food component is water. Foods may either pick up or lose moisture from the environment, depending on storage conditions and product characteristics. Moisture migration between structural elements in a food, as in pizza crust and tomato sauce in a refrigerated pizza, can also occur and cause loss of product quality The rate of moisture migration depends on the differences in water activity or vapor pressure, Appropriate packaging (vacuum packaging and moisture barriers) can greatly reduce rates of drying of refrigerated foods. $qZZr&" Phase Change In some products, phase changes occurring slowly over time can cause loss of product quality due to associated physical changes. Staling of bread involves slow crystallization of elements of the starch molecule and is thought to lead to firming of the bread matrix. Other examples of phase changes influencing storage life in refrigerated foods include blooming of chocolates and hardening of butter due to lipid crystallization at low temperatures. ZESTABLISHING SHELF-LIFE$"  '#Factors Affecting Storage LifeThe nature and type of raw materials Product formulation and assembly The hygienic nature of processing steps Package material and integrity Storage and distribution conditions How the product is handled by consumer ($Product Formulation & Assembly(MProper formulation minimize negative physicochemical reactions that shorten shelf life Water migration between components of different water activity is a common factor limiting shelf life of foods, Proper formulation and assembly can minimize shelf life problems, for example through use of water--barrier films between components.  MN)%The hygiene of processing stepssThe initial microbial content Pasteurization of milk reduces the M. population Post-process contamination decrease shelf life. Blanching of vegetables inactivate enzymes Proper hygiene in the processing plant is also critical to maintaining shelf life. Poor hygiene results in contaminated foods that significantly decrease shelf life, as well as posing health risks.  st*&_Use the best packaging possible. An excellent product with potential for extended shelf life can be ruined through use of improper packaging. Appropriate barrier properties for packaging films must be determined for each product. Limiting transfer of moisture, oxygen, and other gases, as well as limiting light can significantly increase shelf life. `Z`Predicting Shelf Life 0$(  r  S +TP T r  S +T` T H  0޽h ? H$֛3ff    $(   r  S O  O r  S OYx O H  0޽h ? H$֛3ff  P($(  (r ( S x]T  T r ( S ^TYx T H ( 0޽h ? H$֛3ff  `$$(  $r $ S 8T  T r $ S `TYx T H $ 0޽h ? H$֛3ff  <$(  <r < S R*T( V,I( / 00DTimes New Roman\bbv 0b( 0gD[SOes New Roman\bbv 0b( 0g DWingdingsRoman\bbv 0b( 0g0DArialngsRoman\bbv 0b( 0g" `(.  @n?" dd@  @@`` jb1(        !"#%&'(b$$ M."S.b$n3!ߞ"dx S.R$4/h =W.b$|MX@Qr`_[i.b$WB0+|iE!hy.b$wp]G.b$AͰRT2 9R.b$O\$޸=i|:].b$}yz( g)X1.b$'Hڜt*$TyȱZ.b$xS>uCHPLTE{{{BBBkkk)1199)))cccsssޜRRR֥֭֜{ΜkΥ絜cRBcBB99ZZZJJJ﵄kƌkƌέZ{9!11ƜBƵޥBc!JΥ9{9޵ƌcƌZRΔέkΌRﵵs9ֵֽƜJ΄1Z޵Ɣ޽{έJs)!sֵֽ֥kJ֭sνΥJBZ9Ɣc tRNS0J cmPPJCmp0712-4IDAT(I+)eh80R(R qPROʖq"1<` ##LUuvE$b6ۧ|\ѥ.׍eUTBfӘ/B:@.޳ 9ՆFz;}q6ZGwB?N(Ơoue>yToew߀Bd2=߯QKD Au[ 4Y+21R*PȺ DCUs*ScLvSMIENDB`n5ߢ:DwA]PNG  IHDR lΤPLTEffStRNS0J cmPPJCmp0712Om"IDATc01`! (F?tIENDB`? %":REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$( Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t   +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lu: ": "" 9CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGEB:    JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,    5External Factors Influencing Growth of MicroorganismsWInitial Microorganism Population. Characteristics of the Food Effects Of Processing. LX!$$$$$ Initial Microorganism Population!!The type and number of microorganisms present during refrigerated storage is important in determining shelf life in refrigerated foods. In general, more microbes present initially results in decreased storage life. Characteristics of the FoodFactors influencing shelf life of refrigerated foods Water activity pH nutrient content for microbial growth preservative content Low pH, low water activity, and proper formulation can lengthen refrigerated storage time of foods. .5Effects Of ProcessingTemperature Pretreatment (i.e., pasteurization) pH adjustment Drying (reducing water activity) Addition of preservatives Storage atmosphere. Refrigerated storage is focused on spoilage bacteria, however pathogens may be present. X !DETERIORATION OF PRODUCT QUALITY " Chemical Reactions Lipid Oxidation/Maillard Browning Biochemical Reactions Enzymic Browning Glycolysis/Poteolysis/Lipolysis. Physicochemical Reactions or Processes Component Migration/Phase Change. Nutritional Changes in Refrigerated Foods 73'N!"1'"!+b$!   xLipid OxidationaIn meats, poultry, dairy,fish products ,lipid oxidation is a significant quality factor during refrigerated storage. Lipid oxidation causes a characteristic oxidized flavor, or rancidity, through a complex series of reactions. Degree of unsaturation of fatty acids, their availability, and the presence of activators or inhibitors are primary factors affecting the rate of lipid oxidation. Lipid oxidation can be prevented using the following techniques: addition of antioxidants, modified atmosphere storage (exclusion of oxygen), or vacuum packaging. the rate of lipid oxidation decreases with temperature. bZb i Maillard Browning This complex chemical reaction between reducing sugars and proteins, leading to brown discoloration, may also occur at refrigerated temperatures. However, the rate of Maillard browning is significantly reduced at low temperature$ 6!Enzymic Browning Enzymic browning occurs in fruits and vegetables after bruising or process preparations, such as cutting, peeling, or slicing. Phenolases contained within the tissue react with phenolic compounds in the presence of oxygen to produce a yellowish--brown pigment. The rate and extent of browning depends on the enzyme content the type of product pH, availability of oxygen, packaging conditions, and presence of inhibitors. Vacuum packaging or modified atmosphere packaging, and addition of inhibitors such as sulphites, citric acid, or ascorbic acid, can greatly reduce the effects of browning, typically, enzyme reactions are reduced at low temperature. $ZZHw ' A " Glycolysis  In living tissue, breakdown of glycogen is an important aspect of cell function and structure. After harvest or slaughter, this process still takes place, but changes in oxygen content direct this reaction to different end points, which cause breakdown of tissues and softening of structure, among other things. As with all biochemical reactions, the rate of glycolysis is decreased at refrigeration temperatures, and physical changes associated with continued ripening are slowed.  f s# Proteolysis  Proteases present in foods can alter flavor and texture of many products, including meat and fish, dairy products, and cheese. These enzymes attack protein matter in the food, breaking them down into peptides or shorter chain amino acid sequences. Many of these peptides contribute greatly to flavor changes during storage, while stiffness or texture may also be affected. In meats, for example, proteolysis is in part responsible for softening of tissue after slaughter. This process may take place over a 2 to 5week period in refrigerated storage. In cheese, proteolysis is thought to contribute to generation of characteristic flavors through release of peptides from casein. Z$  Lipolysis  Lipases, whether already present or added as part of a product formulation, catalyse hydrolysis of triacylglycerols into fatty acids and other glyceride breakdown products (mono- and diglycerides). Since many fatty acids have characteristic flavors and odors, some of them unpleasant lipolysis causes loss of product quality. An exception to this occurs in certain types of cheeses, where these lipid breakdown products enhance the flavor of the final product after ripening. 0ZZbK   X %!Component Migrationqmigration of components can cause changes to product quality. The most important and mobile food component is water. Foods may either pick up or lose moisture from the environment, depending on storage conditions and product characteristics. Moisture migration between structural elements in a food, as in pizza crust and tomato sauce in a refrigerated pizza, can also occur and cause loss of product quality The rate of moisture migration depends on the differences in water activity or vapor pressure, Appropriate packaging (vacuum packaging and moisture barriers) can greatly reduce rates of drying of refrigerated foods. $qZZr&" Phase Change In some products, phase changes occurring slowly over time can cause loss of product quality due to associated physical changes. Staling of bread involves slow crystallization of elements of the starch molecule and is thought to lead to firming of the bread matrix. Other examples of phase changes influencing storage life in refrigerated foods include blooming of chocolates and hardening of butter due to lipid crystallization at low temperatures. ZESTABLISHING SHELF-LIFE$"  '#Factors Affecting Storage LifeThe nature and type of raw materials Product formulation and assembly The hygienic nature of processing steps Package material and integrity Storage and distribution conditions How the product is handled by consumer ($Product Formulation & Assembly(MProper formulation minimize negative physicochemical reactions that shorten shelf life Water migration between components of different water activity is a common factor limiting shelf life of foods, Proper formulation and assembly can minimize shelf life problems, for example through use of water--barrier films between components.  MN)%The hygiene of processing stepssThe initial microbial content Pasteurization of milk reduces the M. population Post-process contamination decrease shelf life. Blanching of vegetables inactivate enzymes Proper hygiene in the processing plant is also critical to maintaining shelf life. Poor hygiene results in contaminated foods that significantly decrease shelf life, as well as posing health risks.  st*&Package material and integrityXUse appropriated package. An excellent product with potential for extended shelf life can be ruined through use of improper packaging. Appropriate barrier properties for packaging films must be determined for each product. Limiting transfer of moisture, oxygen, and other gases, as well as limiting light can significantly increase shelf life. +'Temperature & Relative humilitythe importance of temperature and time on the kinetics of negative quality reactions is clear. 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(F?tIENDB`? %J:REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$( Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t   +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lu: ": "" 9CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGEB:    JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,    5External Factors Influencing Growth of MicroorganismsWInitial Microorganism Population. Characteristics of the Food Effects Of Processing. LX!$$$$$ Initial Microorganism Population!!The type and number of microorganisms present during refrigerated storage is important in determining shelf life in refrigerated foods. In general, more microbes present initially results in decreased storage life. Characteristics of the FoodFactors influencing shelf life of refrigerated foods Water activity pH nutrient content for microbial growth preservative content Low pH, low water activity, and proper formulation can lengthen refrigerated storage time of foods. .5Effects Of ProcessingTemperature Pretreatment (i.e., pasteurization) pH adjustment Drying (reducing water activity) Addition of preservatives Storage atmosphere. Refrigerated storage is focused on spoilage bacteria, however pathogens may be present. X !DETERIORATION OF PRODUCT QUALITY " Chemical Reactions Lipid Oxidation/Maillard Browning Biochemical Reactions Enzymic Browning Glycolysis/Poteolysis/Lipolysis. Physicochemical Reactions or Processes Component Migration/Phase Change. Nutritional Changes in Refrigerated Foods 73'N!"1'"!+b$!   xLipid OxidationaIn meats, poultry, dairy,fish products ,lipid oxidation is a significant quality factor during refrigerated storage. Lipid oxidation causes a characteristic oxidized flavor, or rancidity, through a complex series of reactions. Degree of unsaturation of fatty acids, their availability, and the presence of activators or inhibitors are primary factors affecting the rate of lipid oxidation. Lipid oxidation can be prevented using the following techniques: addition of antioxidants, modified atmosphere storage (exclusion of oxygen), or vacuum packaging. the rate of lipid oxidation decreases with temperature. bZb i Maillard Browning This complex chemical reaction between reducing sugars and proteins, leading to brown discoloration, may also occur at refrigerated temperatures. However, the rate of Maillard browning is significantly reduced at low temperature$ 6!Enzymic Browning Enzymic browning occurs in fruits and vegetables after bruising or process preparations, such as cutting, peeling, or slicing. Phenolases contained within the tissue react with phenolic compounds in the presence of oxygen to produce a yellowish--brown pigment. The rate and extent of browning depends on the enzyme content the type of product pH, availability of oxygen, packaging conditions, and presence of inhibitors. Vacuum packaging or modified atmosphere packaging, and addition of inhibitors such as sulphites, citric acid, or ascorbic acid, can greatly reduce the effects of browning, typically, enzyme reactions are reduced at low temperature. $ZZHw ' A " Glycolysis  In living tissue, breakdown of glycogen is an important aspect of cell function and structure. After harvest or slaughter, this process still takes place, but changes in oxygen content direct this reaction to different end points, which cause breakdown of tissues and softening of structure, among other things. As with all biochemical reactions, the rate of glycolysis is decreased at refrigeration temperatures, and physical changes associated with continued ripening are slowed.  f s# Proteolysis  Proteases present in foods can alter flavor and texture of many products, including meat and fish, dairy products, and cheese. These enzymes attack protein matter in the food, breaking them down into peptides or shorter chain amino acid sequences. Many of these peptides contribute greatly to flavor changes during storage, while stiffness or texture may also be affected. In meats, for example, proteolysis is in part responsible for softening of tissue after slaughter. This process may take place over a 2 to 5week period in refrigerated storage. In cheese, proteolysis is thought to contribute to generation of characteristic flavors through release of peptides from casein. Z$  Lipolysis  Lipases, whether already present or added as part of a product formulation, catalyse hydrolysis of triacylglycerols into fatty acids and other glyceride breakdown products (mono- and diglycerides). Since many fatty acids have characteristic flavors and odors, some of them unpleasant lipolysis causes loss of product quality. An exception to this occurs in certain types of cheeses, where these lipid breakdown products enhance the flavor of the final product after ripening. 0ZZbK   X %!Component Migrationqmigration of components can cause changes to product quality. The most important and mobile food component is water. Foods may either pick up or lose moisture from the environment, depending on storage conditions and product characteristics. Moisture migration between structural elements in a food, as in pizza crust and tomato sauce in a refrigerated pizza, can also occur and cause loss of product quality The rate of moisture migration depends on the differences in water activity or vapor pressure, Appropriate packaging (vacuum packaging and moisture barriers) can greatly reduce rates of drying of refrigerated foods. $qZZr&" Phase Change In some products, phase changes occurring slowly over time can cause loss of product quality due to associated physical changes. Staling of bread involves slow crystallization of elements of the starch molecule and is thought to lead to firming of the bread matrix. Other examples of phase changes influencing storage life in refrigerated foods include blooming of chocolates and hardening of butter due to lipid crystallization at low temperatures. ZESTABLISHING SHELF-LIFE$"  '#Factors Affecting Storage LifeThe nature and type of raw materials Product formulation and assembly The hygienic nature of processing steps Package material and integrity Storage and distribution conditions How the product is handled by consumer ($Product Formulation & Assembly(MProper formulation minimize negative physicochemical reactions that shorten shelf life Water migration between components of different water activity is a common factor limiting shelf life of foods, Proper formulation and assembly can minimize shelf life problems, for example through use of water--barrier films between components.  MN)%The hygiene of processing stepssThe initial microbial content Pasteurization of milk reduces the M. population Post-process contamination decrease shelf life. Blanching of vegetables inactivate enzymes Proper hygiene in the processing plant is also critical to maintaining shelf life. Poor hygiene results in contaminated foods that significantly decrease shelf life, as well as posing health risks.  st*&Package material and integrityXUse appropriated package. An excellent product with potential for extended shelf life can be ruined through use of improper packaging. Appropriate barrier properties for packaging films must be determined for each product. Limiting transfer of moisture, oxygen, and other gases, as well as limiting light can significantly increase shelf life. +'Temperature & Relative humilitythe importance of temperature and time on the kinetics of negative quality reactions is clear. Each product has its own optimal storage conditions at which shelf life is maximized ,(&How the product is handled by consumerJThe time between when the consumer removes the product from the refrigerated retail cabinet to when he places the product in the home refrigerator significantly influences storage life Even when the product is in the home refrigerator, significant variability can occur, as temperature in these units is not consistent or stable KKPredicting Shelf Life-)  bZ(  r  S S  S    ` ?"@E@   bA?|| X SH  0޽h ? H$֛3ffr-) -K( / 00DTimes New RomanTT$0ܖ 0ܖgD[SOes New RomanTT$0ܖ 0ܖg DWingdingsRomanTT$0ܖ 0ܖg0DArialngsRomanTT$0ܖ 0ܖ@(.  @n?" dd@  @@`` 2)  .*+-02/1"*  ,-02%&'()b$$ M."Sb$n3!ߞ"dx SR$4/h =Wb$|MX@Qr`_[ib$WB0+|iE!hyb$wp]Gb$AͰRT2 9Rb$O\$޸=i|:]b$}yz( g)X1b$'Hڜt*$TyȱZb$xS>uCHPLTE{{{BBBkkk)1199)))cccsssޜRRR֥֭֜{ΜkΥ絜cRBcBB99ZZZJJJ﵄kƌkƌέZ{9!11ƜBƵޥBc!JΥ9{9޵ƌcƌZRΔέkΌRﵵs9ֵֽƜJ΄1Z޵Ɣ޽{έJs)!sֵֽ֥kJ֭sνΥJBZ9Ɣc tRNS0J cmPPJCmp0712-4IDAT(I+)eh80R(R qPROʖq"1<` ##LUuvE$b6ۧ|\ѥ.׍eUTBfӘ/B:@.޳ 9ՆFz;}q6ZGwB?N(Ơoue>yToew߀Bd2=߯QKD Au[ 4Y+21R*PȺ DCUs*ScLvSMIENDB`n5ߢ:DwA]PNG  IHDR lΤPLTEffStRNS0J cmPPJCmp0712Om"IDATc01`! (F?tIENDB`? %r;REFRIGERATED STORAGE $$INTRODUCTION PRINCIPLES OF REFRIGERATED STORAGE CONTROL OF MICROBIAL GROWTH DURING REFRIGERATEED STORAGE ESTABLISHING SHELF-LIFE IN REFRIGERATED FOODS DETERIORATION OF PRODUCT QUALITY 2 INTRODUCTION $Primary purpose of refrigerating foods is to extend shelf life by slowing down degradation reactions and limiting microbial growth. Through reduction in rates of chemical, biochemical, and microbial kinetics, low--temperature storage can extend the shelf life of fresh and processed foods By holding food in the temp. range of -l to 8!.  RSPDeferent Food s Optimal Storage Temp. &)&$(  Slow Down The Reaction Ratelimits the rate of chemical, biochemical, and physicochemical changes. rates of lipid oxidation nonenzymatic browning sugar conversion enzymic browning respiration reactions The sum of all these effects results in extended shelf life for refrigerated foods. 4ZZZ>a t     +GENERAL PRINCIPLES OF REFRIGERATED STORAGE ,*Pretreatment Chilling Processes Chilling of Solid Foods. Chilling of Liquid Food Refrigerated Storage Temperature. Air Circulation. Air Composition.   "   *GENERAL PRINCIPLES OF REFRIGERATED STORAGE++Refrigerated Transport Mechanical Refrigeration Systems. Eutectic Plate Systems. Liquid Nitrogen. Retail Storage Refrigerated Cabinets for Food Service Home Refrigeration lv:!": ," 8CONTROL OF MICROBIAL GROWTH DURING REFRIGERATED STORAGEB9    $  JLow temperatures slow the rate of each step in the microbial growth cycle, resulting in longer lag phase, slower growth in the exponential phase, and reducing the generation time Some pathogens can grow at low temperatures (Clostridium botulinum type E at 5.5!; Listeria moncytogenes at 3!) Bs ,      5External Factors Influencing Growth of MicroorganismsWInitial Microorganism Population. Characteristics of the Food Effects Of Processing. LX!$$$$$ Initial Microorganism Population!!The type and number of microorganisms present during refrigerated storage is important in determining shelf life in refrigerated foods. In general, more microbes present initially results in decreased storage life. Characteristics of the FoodFactors influencing shelf life of refrigerated foods Water activity pH nutrient content for microbial growth preservative content Low pH, low water activity, and proper formulation can lengthen refrigerated storage time of foods. .5Effects Of ProcessingTemperature Pretreatment (i.e., pasteurization) pH adjustment Drying (reducing water activity) Addition of preservatives Storage atmosphere. Refrigerated storage is focused on spoilage bacteria, however pathogens may be present. X     !DETERIORATION OF PRODUCT QUALITY " Chemical Reactions Lipid Oxidation/Maillard Browning Biochemical Reactions Enzymic Browning Glycolysis/Poteolysis/Lipolysis. Physicochemical Reactions or Processes Component Migration/Phase Change. Nutritional Changes in Refrigerated Foods 73'N!"1' " !+b$!   xLipid OxidationaIn meats, poultry, dairy,fish products ,lipid oxidation is a significant quality factor during refrigerated storage. Lipid oxidation causes a characteristic oxidized flavor, or rancidity, through a complex series of reactions. Degree of unsaturation of fatty acids, their availability, and the presence of activators or inhibitors are primary factors affecting the rate of lipid oxidation. Lipid oxidation can be prevented using the following techniques: addition of antioxidants, modified atmosphere storage (exclusion of oxygen), or vacuum packaging. the rate of lipid oxidation decreases with temperature. bZb i Maillard Browning This complex chemical reaction between reducing sugars and proteins, leading to brown discoloration, may also occur at refrigerated temperatures. However, the rate of Maillard browning is significantly reduced at low temperature$ 6!Enzymic Browning Enzymic browning occurs in fruits and vegetables after bruising or process preparations, such as cutting, peeling, or slicing. Phenolases contained within the tissue react with phenolic compounds in the presence of oxygen to produce a yellowish--brown pigment. The rate and extent of browning depends on the enzyme content the type of product pH, availability of oxygen, packaging conditions, and presence of inhibitors. Vacuum packaging or modified atmosphere packaging, and addition of inhibitors such as sulphites, citric acid, or ascorbic acid, can greatly reduce the effects of browning, typically, enzyme reactions are reduced at low temperature. $ZZHw ' A " Glycolysis  In living tissue, breakdown of glycogen is an important aspect of cell function and structure. After harvest or slaughter, this process still takes place, but changes in oxygen content direct this reaction to different end points, which cause breakdown of tissues and softening of structure, among other things. As with all biochemical reactions, the rate of glycolysis is decreased at refrigeration temperatures, and physical changes associated with continued ripening are slowed.  f s# Proteolysis  Proteases present in foods can alter flavor and texture of many products, including meat and fish, dairy products, and cheese. These enzymes attack protein matter in the food, breaking them down into peptides or shorter chain amino acid sequences. Many of these peptides contribute greatly to flavor changes during storage, while stiffness or texture may also be affected. In meats, for example, proteolysis is in part responsible for softening of tissue after slaughter. This process may take place over a 2 to 5week period in refrigerated storage. In cheese, proteolysis is thought to contribute to generation of characteristic flavors through release of peptides from casein. Z$  Lipolysis  Lipases, whether already present or added as part of a product formulation, catalyse hydrolysis of triacylglycerols into fatty acids and other glyceride breakdown products (mono- and diglycerides). Since many fatty acids have characteristic flavors and odors, some of them unpleasant lipolysis causes loss of product quality. An exception to this occurs in certain types of cheeses, where these lipid breakdown products enhance the flavor of the final product after ripening. 0ZZbK   X %!Component Migrationqmigration of components can cause changes to product quality. The most important and mobile food component is water. Foods may either pick up or lose moisture from the environment, depending on storage conditions and product characteristics. Moisture migration between structural elements in a food, as in pizza crust and tomato sauce in a refrigerated pizza, can also occur and cause loss of product quality The rate of moisture migration depends on the differences in water activity or vapor pressure, Appropriate packaging (vacuum packaging and moisture barriers) can greatly reduce rates of drying of refrigerated foods. $qZZr&" Phase Change In some products, phase changes occurring slowly over time can cause loss of product quality due to associated physical changes. Staling of bread involves slow crystallization of elements of the starch molecule and is thought to lead to firming of the bread matrix. Other examples of phase changes influencing storage life in refrigerated foods include blooming of chocolates and hardening of butter due to lipid crystallization at low temperatures. ZESTABLISHING SHELF-LIFE$"   '#Factors Affecting Storage LifeThe nature and type of raw materials Product formulation and assembly The hygienic nature of processing steps Package material and integrity Storage and distribution conditions How the product is handled by consumer  ($Product Formulation & Assembly(MProper formulation minimize negative physicochemical reactions that shorten shelf life Water migration between components of different water activity is a common factor limiting shelf life of foods, Proper formulation and assembly can minimize shelf life problems, for example through use of water--barrier films between components.  MN)%The hygiene of processing stepssThe initial microbial content Pasteurization of milk reduces the M. population Post-process contamination decrease shelf life. Blanching of vegetables inactivate enzymes Proper hygiene in the processing plant is also critical to maintaining shelf life. Poor hygiene results in contaminated foods that significantly decrease shelf life, as well as posing health risks.  st*&Package material and integrityXUse appropriated package. An excellent product with potential for extended shelf life can be ruined through use of improper packaging. Appropriate barrier properties for packaging films must be determined for each product. Limiting transfer of moisture, oxygen, and other gases, as well as limiting light can significantly increase shelf life. +'Temperature & Relative humilitythe importance of temperature and time on the kinetics of negative quality reactions is clear. 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