Abstract
The determination of available lysine was studied using 2,4,6-trinitrobenzene-sulfonic acid (TNBS) as a reagent for free epsilon amino group of lysine. By establishing optimal conditions for the hydrolysis of TNP-labelled protein, a modification of a previously described TNBS-method was proposed. The changes reduced the analytical variations substantially from the original method and made it possible to obtain in a simple and rapid way quite reproducible values for the contents of available lysine in casein and rapeseed protein concentrates.
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