title: [Formation of dipeptides--a side reaction in racemization of phenylalanine].
abstract: It was shown that acetylated dipeptides, Ac-D-Phe-D-Phe-OH, Ac-L-Phe-L-Phe-OH, Ac-D-Phe-L-Phe-OH, and Ac-L-Phe-D-Phe-OH, are formed during D-phenylalanine racemization. The overall content of these dipeptides in the reaction mixture ranged from 40 to 60% depending on the reaction conditions. We concluded that, like alpha-aminoisobutyric acid, phenylalanine is prone to polymerization under racemization conditions.
authors.affiliation: State Research Institute of Genetics and Selection of Industrial Microorganisms, Moscow, Russia. lab11@vnigen.msk.su
authors.forename: E K
authors.initials: EK
authors.lastname: Kotlova
authors.forename: E A
authors.initials: EA
authors.lastname: Timokhina
authors.forename: G G
authors.initials: GG
authors.lastname: Chestukhina
authors.forename: V M
authors.initials: VM
authors.lastname: Stepanov
mesh_terms: D002851:Chromatography, High Pressure Liquid; D013058:Mass Spectrometry; D010649:Phenylalanine / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D010649:Phenylalanine