Introduction
Nutritive Composition of the Major Groups of Seafood and
Their Health Attributes
Composition
Macronutrients
Micronutrients
Other Components
Health Attributes
Biochemistry of Glycogen Degradation
Biochemistry of Protein Degradation
Sarcoplasmic Proteins
Myofibrillar Protein Deterioration
Stromal Protein Deterioration
Biochemical Changes in Nonprotein Nitrogenous Compounds
Lipids in Seafoods
Lipid Composition
Lipids and Quality Problems
Minimization of Lipid-Derived Quality Problems
Biochemical Changes in Pigments During Handling, Storage,
and Processing
Epithelial Discoloration
Hemoglobin
Hemocyanin
Myoglobin
Carotenoids
Melanosis (Melanin Formation)
Biochemical Indices
Lactic Acid Formation with Lowering of pH
Nucleotide Catabolism
Degradation of Myofibrillar Proteins
Collagen Degradation
Dimethylamine Formation
Free Fatty Acid Accumulation
Yerlikaya P, Gokoglu N. 2010. Inhibition effects of green tea and grape seed
extracts on lipid oxidation in bonito fillets during frozen storage. Int J Food Sci
Technol 45(2): 252–257.
Tyrosine Accumulation
Biochemical and Physicochemical Changes in Seafood
During Freezing and Frozen Storage
Protein Denaturation
Ice Crystal Effect
Dehydration Effect
Solute Concentration Effect
Reaction of Protein with Intact Lipids
Reaction of Proteins with Oxidized Lipids
Lipid Oxidation and Hydrolysis
Degradation of Trimethylamine Oxide
Summary
Biochemistry of Dried, Fermented, Pickled, and Smoked
Seafood
Biochemistry of Thermal-Processed Products
References
Abstract: Seafood is valued for its nutritive components and desirable
sensory attributes. However, quality of seafood is vulnerable
to rapid degradation if no appropriate postharvest handling or processing
methods are used. It is important to understand the basic
biochemical reactions of the relevant components in seafood in order
that their quality can be best preserved. Biochemical changes in
glycogen, protein, lipids, and pigments are discussed in detail and
how such changes could affect the quality of seafood. Metabolic
changes from the activity of enzymes can be used as indices of
freshness and be monitored by biochemical or chemical methods.
Three different manufacturing process techniques, (1) freezing, (2)
dehydration, and (3) thermal are discussed with respect to the biochemical
changes.
INTRODUCTION
Most of us like to eat seafood, especially when it is fresh, although
processed products are also favorites of many consumers.
In addition to sensory attributes, the preference for seafood now
IntroductionNutritive Composition of the Major Groups of Seafood andTheir Health AttributesCompositionMacronutrientsMicronutrientsOther ComponentsHealth AttributesBiochemistry of Glycogen DegradationBiochemistry of Protein DegradationSarcoplasmic ProteinsMyofibrillar Protein DeteriorationStromal Protein DeteriorationBiochemical Changes in Nonprotein Nitrogenous CompoundsLipids in SeafoodsLipid CompositionLipids and Quality ProblemsMinimization of Lipid-Derived Quality ProblemsBiochemical Changes in Pigments During Handling, Storage,and ProcessingEpithelial DiscolorationHemoglobinHemocyaninMyoglobinCarotenoidsMelanosis (Melanin Formation)Biochemical IndicesLactic Acid Formation with Lowering of pHNucleotide CatabolismDegradation of Myofibrillar ProteinsCollagen DegradationDimethylamine FormationFree Fatty Acid AccumulationYerlikaya P, Gokoglu N. 2010. Inhibition effects of green tea and grape seedextracts on lipid oxidation in bonito fillets during frozen storage. Int J Food SciTechnol 45(2): 252–257.Tyrosine AccumulationBiochemical and Physicochemical Changes in SeafoodDuring Freezing and Frozen StorageProtein DenaturationIce Crystal EffectDehydration EffectSolute Concentration EffectReaction of Protein with Intact LipidsReaction of Proteins with Oxidized LipidsLipid Oxidation and HydrolysisDegradation of Trimethylamine OxideSummaryBiochemistry of Dried, Fermented, Pickled, and SmokedSeafoodBiochemistry of Thermal-Processed ProductsReferencesAbstract: Seafood is valued for its nutritive components and desirablesensory attributes. However, quality of seafood is vulnerableto rapid degradation if no appropriate postharvest handling or processingmethods are used. It is important to understand the basicbiochemical reactions of the relevant components in seafood in orderthat their quality can be best preserved. Biochemical changes inglycogen, protein, lipids, and pigments are discussed in detail andhow such changes could affect the quality of seafood. Metabolicchanges from the activity of enzymes can be used as indices offreshness and be monitored by biochemical or chemical methods.Three different manufacturing process techniques, (1) freezing, (2)dehydration, and (3) thermal are discussed with respect to the biochemicalchanges.INTRODUCTIONMost of us like to eat seafood, especially when it is fresh, althoughprocessed products are also favorites of many consumers.In addition to sensory attributes, the preference for seafood now
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