Photosensitized isomerization of all-trans spheroidene and electronic absorption spectra of the isomers

Abstract

All-trans-spheroidene was extracted from the cells of Rhodobacter sphaeroides 2.4.1 and a set of cis-trans isomers [9,13'-cis (peak A), 5,13-cis+13,9'-cis (peak B), 13-cis (peak C), 5,13'-cis (peak E1), 9-cis (peak E2), 13'-cis (peak F), 5,9'-cis (peak G), 9'-cis (peak H), all-trans (peak I)] were separated from an isomeric mixture obtained by iodine-sensitized photo-isomerization of the all-trans isomer by high-pressure liquid chromatography (HPLC) using a calcium hydroxide column. The effect of isomeric structures on electronic absorption spectra and retention of HPLC was studied and peak E1 was identified as 5,13'-cis. The mechanism of photosensitized isomerization of all-trans spheroidene was also discussed.

Key words: PHOTOSENSITIZATION, REACTION MECHANISM, HIGH SPEED LIQUID CHROMATOGRAPHY, ISOMERIZATION

CLC Number:

O644

Cite this article

JIANG YUESHUN;XIAO SHANTAI. Photosensitized isomerization of all-trans spheroidene and electronic absorption spectra of the isomers[J]. Acta Chimica Sinica, 1997, 55(2): 172-177.

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