The proteins of Hevea brasiliensis

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Abstract
A protein isolated from dried Hevea latex was analysed for amide-N, tyrosine, tryptophan, cystine, methionine, the basic ammo-acids and the dicarboxylic acids. The dicarboxylic acids were estimated in 4 g. protein, expts. on casein having shown that, under such conditions, 90% of the glutamic acid and aspartic acid are recovered as crystalline derivatives. Arginine and lysine in the filtrate were estimated from the Ca salts of the dicarboxylic acids. The protein is similar to those in leaves of other plants.