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Solvent effects on CD and MCD spectra of phenylalanine and its related compounds

✍ Scribed by Tomoko Komiyama; Makoto Miwa

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
187 KB
Volume
18
Category
Article
ISSN
0020-7608

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✦ Synopsis

Abstract

Solvent effects and pH effects on CD and MCD spectra of phenylalanine and its derivatives were observed. CD spectra of N‐acetyl‐L‐phenylalanine ethyl ester in various solvents were analyzed using the rotamer population determined by NMR. The magnitude of optical activity due to each rotamer was determined for two CD bands. The signs of Cotton effect of rotamers I and II are positive and that of rotamer II is negative. The optical activity is greater in polar than in nonpolar solvents. MCD spectra of phenylalanine reveal a remarkable pH effect. In the alkaline pH range it is of the toluene type, from which it turns to a weak spectrum in the acid pH range.

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