Abstract
Chitosan, a cationic carbohydrate polymer manufactured from chitin in shrimp and crab wastes, coagulated suspended solids in cheese whey as effectively or more so than ten commercial synthetic polymers. Concentrations of suspended solids after settling were reduced over 90% by coagulation at pH 6.0 with a ratio of chitosan to suspended solids of 2.15% (1:46.5). The yield of coagulated solids was approximately 2,270 mg/liter. The proximate composition of the coagulated solids after freeze drying was 73% protein, 6% lactose, 10% ash, and 7% moisture. Without the aid of a coagulating agent, setting for 1 or 3 h reduced suspended solids by only 34% and 49%, respectively. Rat feeding studies showed nn significant differences in the protein efficiency ratio of casein, coagulated whey solids containing chitosan, and whey solids containing no polymer. These results provide evidence of utility for coagulated whey solids as a protein supplement.
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