We have previously reported work on the influence of optical isomerism on the utilization of essential amino acids for growth. As an extension of this program we have devised a method for the resolution of di-lysine and have fed the d and the l modifications to rats as supplements to diets deficient in lysine, but otherwise complete. The unnatural l-lysine proved to be unable to stimulate growth. In this respect it is like the unnatural modification (d) of cystine, but differs from the unnatural isomers of tryptophane (d) and histidine (d).
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Berg, Clarence P.
"Growth Promoting Ability of d- and l-Lysine,"
Proceedings of the Iowa Academy of Science, 43(1), 201-201.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/42