Preparation of some protein samples from the fresh leaves of plants and the sulphur distributions of the preparations

BOTH from a general standpoint and from the particular one of nutrition, the compositions of the proteins which are present in the leaves of plants are of very considerable interest. In the present article, methods for determining sulphur- distributions, particularly in their bearing upon the estimations of cystine, cysteine and methionine, are examined and applied to several leaf protein preparations.