Compositional characteristics of materials recovered from whole gutted silver carp (Hypophthalmichthys molitrix) using isoelectric solubilization/precipitation.
Isoelectric solubilization/precipitation (ISP) at acidic and basic pH was applied to whole carp, yielding proteins, lipids, and insolubles. The objective was to characterize composition of recovered materials. Crude protein was concentrated to 89-90% in proteins recovered at acidic pH and to 94-95% at basic pH. Basic pH yielded proteins with more (P < 0.05) essential amino acids (EAAs). EAA content in recovered proteins met FAO/WHO/UNO requirements. ISP did not affect fatty acid (FA) composition. Lipids recovered at acidic pH contained 88-89% of total fat and at basic pH, 94-97%. Total fat in recovered proteins was low, with EPA and DHA at the highest (P < 0.05) percentage for pH 11.5. ISP, particularly basic pH, effectively removed impurities such as bones and scales from whole carp. This is indicated by 3.8-5.8% of ash in recovered proteins compared to 11.2% for whole carp and 5.4% for boneless/skinless carp fillets. Basic pH yielded less (P < 0.05) Ca, P, and Mg in recovered proteins. These minerals were more (P < 0.05) concentrated in insolubles recovered with basic pH. This study indicates that materials recovered from whole carp using ISP have high nutritional value and may be useful in the development of human food and animal feeds.
Faculty of Fisheries, Department of Fish Processing Technology, Ege University, 35100 Bornova Izmir, Turkey.
Latif
L
Taskaya
Yi-Chen
YC
Chen
Sarah
S
Beamer
Janet C
JC
Tou
Jacek
J
Jaczynski
D000596:Amino Acids / Q000032:analysis; D000601:Amino Acids, Essential / Q000032:analysis; D000818:Animals; D002347:Carps; D011232:Chemical Precipitation; D005223:Fats / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis; D005395:Fish Oils / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008460:Meat / Q000032:analysis*; D008903:Minerals / Q000032:analysis; D009124:Muscle Proteins / Q000032:analysis*; D009753:Nutritive Value; D012995:Solubility
D000596:Amino Acids; D000601:Amino Acids, Essential; D005223:Fats; D005227:Fatty Acids; D005395:Fish Oils; D008903:Minerals; D009124:Muscle Proteins