UTILIZATION OF POULTRY FEATEHRS IN FOOD AND FEED. 3. CHEMICAL EVALUAION OF PROTEIN ISOLATES, PREPARED BY TWO METHODS FROM FEATHERS OF DIFFERENT POULTRIES

Document Type : Original Article

Authors

1 Department of Animal production, Faculty of Agricultural, Moshtohor, Zagazig University, Egypt

2 Food Technology Research institute, Agricultural Research Centre, Giza, Egypt.

10.21608/ejar.1993.466165

Abstract

Protein isolate was prepared from feathers of chicken, goose and duck by NaOH hydrolysis (NaOH-F.P.I., Treatment 1) or KOH hydrolysis (KOH-F.P.I., Treatment 2) followed by isoelectric precipitation with or­thophosphoric acid. the moisture content ranged from 4.87 to 6.61 % on dry weight basis (D.W.) protein, fat ash and carbohydrate ranges were 90.15-94.02%, 0.56-0.80%, 2.87-6.11% and 1.89-3.86% respec­tively . Energy value on WW and DW were 357-368 and 379-391 cal/ 100gm. Highest protein and best physical characteristics were found for chicken KOH-F.P.I. The main source of energy is the protein which con­stiluted more than 94% of the total energey, while fat plus carbohydrate contributed less than 6% of the total energy . Essential amino acids (EAA) concentration and amino acids scores ( A.S.) were higher for chicken than goose or duck F.P.I. and KOH- F.P.I. showed abetter profile of EAA compostition than NaOH-F.P.I. Chicken KOH-NaOH was deficient in 5 EAA, first limiting EAA was lysine, This sample showed highest cal­culated essential amino acid index ( E.A.A.1.) , biological value ( B.V.) and protein efficiency ratio (PER) values. ( When compared with F.P.I., Hy­drolyzed feather meal ( HFM) products which was defficient in 6 - 8 EA A could be considered as either protein concentrate ( not less than 70% protein or defatted meal ( not less than 50% protein ) but never consid­ered P. 1. ( not less than 50% protein) . E.P.I. is recommended to be used in man's diet, while be used in human food as meat substitute .

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