Influence of Heating on the Liberation of Certain Amino Acids from Whole Soybeans.

Abstract
Boiling up to 12 hrs. did not affect the release by acid hydrolysis of alpha-amino N and of arginine, cystine, histidine, leucine, lysine, methionine, and tryptophan. Boiling for 15 min. caused a slight increase in the release of alpha-amino N and amino acids by pancreatic digestion but boiling for 1-12 hrs. resulted in a marked increase. The increase in enzymatic liberation of amino acids in periods over 1 hr. was about twice that from raw soybean. Boiling as long as 12 hrs. with definite browning did not decrease the enzymatic liberation of amino acids from the "overcooked" soybean.