Gamma glutamyl dipeptide content in soybean protein products and other commodities
1978
Wang, L.C. | Cavins, J.F. | Wolf, W.J.
The amount of .gamma.-glutamyl dipeptides (.gamma.-glutamyl tyrosine and .gamma.-glutamyl phenylalanine) present in soybeans and other commodities was measured by a method consisting of alchol extraction, preliminary purification and determination with an automated amino acid analyzer. Defatted soybean flakes of 4 varieties and 1 commericial sample contained 1.17-1.60 mg of the dipeptides/g. Most of the dipeptides in soybean concentrates and isolates were lost through processing. Corn, wheat, cottonseed meal, pork, beef, chicken and lamb appeared to contain only traces, but peanut flour has a content of 0.20 mg/g. The method adequately measures 50 .mu.g of the dipeptides and recovers more than 95% of .gamma.-glutamyl phenylalanine standard added to samples of soybean flour and meat-soybean flour mixtures.
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