The Proteins of Hevea Brasiliensis. 1. Analysis of a Product Isolated from Dried Latex
Abstract A protein has been isolated from dried Hevea latex and analyzed for amido-nitrogen, tyrosine, tryptophan, cystine, methionine, the basic amino-acids and the dicarboxylic acids. The dicarboxylic acids were estimated in 4.0 grams of protein, experiments on casein having shown that, under such conditions, approximately 90% of the glutamic acid and aspartic acid was recovered as crystalline derivatives. It was also found possible to estimate arginine and lysine in the filtrate from the calcium salts of the dicarboxylic acids. The protein is, in many respects, similar to the proteins found in leaves of other plants (Table IV). Further work is in progress to investigate the relationship of the isolated protein to the total protein of latex.