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• W2188993468 abstract "Crayfish are fresh water crustacean that look like a tiny lobster, Fresh water crayfish (Procombarus clarkii) had been introduced accidentally and appear in the River Nile and its tributars all over Egypt during the last years. Therefore,the objective of this study to evaluate the chemical quality and composition of crayfish as a human food, and to introduce a new high quality crustacean organism as a new cheap source of animal proteins. Hundred and fiffty crayfish samples were collected from different farms in Behera and Alexandria Governorates , and were analysed for total protein, amino acids using amino acids analyzer, fat, cholesterol, fatty acids (using GLC), Ash and minerals using atomic absorption spectrophotometer. Total volatile basic nitrogen, pH, free fatty acids and thiobarbituric acid value as a chemical quality index, were also determined. The obtained results revealed good freshness and high chemical quality of crayfish, with regard to their ranges of total volatile basic nitrogen (49-58mg/100g), pH (5.9-6.2), thiobarbituric acid (0.123-0.637) mg molanaldhyde/ kg and free fatty acids (0.93-1.56). Chemical composition and nutritive value of crayfish possessed mean values of total protein, fat, ash and cholesterol contents 13.88%, 1.76%, 1.52% and 13.575mg/100g respectively. Minerals concentrations level were 1.32%, 506.33 and 415.63 ug/g for phosphorous, iron and magnesium respectively. Amino acid pattern showed that Glutamic, Aspartic, Arginine and leucine were abundant essential amino acids and oleic acid represented 44% of total fatty acids. Crayfish showed high nutritional value as respect to higher content of total unsaturated fatty acids (73.689%) with 56.56% and 15.08% monoioneic and polyioneic (with w3 and w6) fatty acids, and also, high quality of protein which contain 55.703% essential amino acids. Also, the present study showed that heavy metals concentration residue decreased in this order zinc > manganese > cadmium > copper > chromium > Nikle > lead. Copper, chromium, cadmium concentration were within the Egyptian permissible limits in all samples, but lead levels exceeded the maximum permissible limits in all samples and zinc exceeded this limit in 75% of examined samples. Results obtained in the present study can be assist in developing quality standard for fresh crayfish in Egypt and recommended rules for it and safety food." @default.
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• W2188993468 date "2009-01-01" @default.
• W2188993468 modified "2023-09-26" @default.
• W2188993468 title "Study on chemical Quality and Nutrition Value of Fresh Water Cray Fish (Procambarus clarkii)" @default.
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