SILAR-10 C as a Liquid Phase for Gas-liquid Chromatography of Alditol Acetates

It is known that amino acid esters added in a protein hydrolysate are covalently incorporated during the plastein reaction. As its modification, a novel simplified process was developed which permitted incorporation of l-methionine directly into soy protein during treatment with papain. This process is characterized by its requirement for a very high substrate (protein) concentration and an alkaline pH condition. Racemic dl-methionine ethyl ester could be used to incorporate the l-isomer only. The amount of l-methionine incorporated varied depending on the amount of formulation of l-methionine ethyl ester; it was easily feasible to obtain final products with almost expected methionine contents. From an economic point of view, defatted soy flour was used as starting material, with a satisfactory result that the methionine level was enhanced in a large measure.