COMPOSITION, PROPERTIES, AND STRUCTURE OF PROTEINS, AMINO ACIDS, AND PEPTIDES
Semi-annual progress rept. 1 Jul-31 Dec 1952
COLUMBIA UNIV NEW YORK COLL OF PHYSICIANS AND SURGEONS
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L-and D-Amino acids D-Glutamic acid I, D-valine, and D-tyro sine were prepared by enzymic or alkaloid resolutions. Difficulties encountered with the enzymic procedure necessitated the alkaloid preparation of D-ornithine, I, and D-serine. Peptides Tripeptides were synthesized without racemization by coupling Z. Ala.OH with H.Ala-Ala.OBz. The synthesis of hydrocholrides of pentapeptide and decapeptide corresonding to Gramiciden-S are reported.