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IN 1939 K6gl and Erxleben (1939a) published the first of a series of papers on the optical configuration of amino-acids in proteins from tumours. It was found that the optical rotations of some amino-acids, which had been isolated by the classical methods and purified by recrystallisation, did not correspond with the values in the literature. It was concluded that the preparations contained the " unnatural " D-isomer in addition to the " natural " or L-isomer. The calculated proportion of D-isomer was largest in serine and glutamic acid. The authors considered that serine had probably been partly racemised during hydrolysis of the proteins or during subsequent purification. Glutamic acid on the other hand was considered resistant to racemisation in acid solution. Glutamic

The Optical Form of Glutamic Acid in Tumours