1961 Volume 34 Issue 3 Pages 422-426
To examine the structures of polyanhydro-L-glutamic acid and polyanhydro-L-aspartic acid, we have studied their monolayer properties and compared them with those of poly-DL-pyrrolidone-2-carboxylic acid and poly-L-succinimide. It was found that polyanhydro-L-glutamic acid is not identical with polypyr-rolidone carboxylic acid but with poly-L-glutarimide, which has a rigidly folded configuration even in monolayer. This conclusion is in agreement with the results obtained by other methods. It was shown, however, that polyanhydro-L-aspartic acid can not be identified with poly-L-succinimide but it might be a copolymer of L-succinimide and L-aspartic acid.
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