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Proceedings Paper

Exciton collision and fluorescence quenching in R-phycoerythrin
Author(s): Xiguang Zheng; He Zhou Wang; Fuli Zhao; Zhaolan Gao; Zhenxin Yu; Jinchang Zhu; Andong Xia; Lijin Jiang
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Paper Abstract

Single ps pulse spectroscopic techniques have been employed to investigate excited-state dynamics of R-phycoerythrin (R-PE) isolated from two red algae Polysiphonia urceolata and Porphyra yezoensis, respectively, at various excitation photon densities in a range of 8 X 1014 $AP 1 X 1017 photons/cm2. The fluorescence quantum yields of the R-PE from the two algae are found to decrease in logarithm with increasing of excitation intensity due to S1-S1 exciton collision. A fast component in addition to a slow one recorded at low excitation density and a large initial anisotropy are observed at higher excitation density. Different dynamical characteristics of exciton collision between the cases of Polysiphonia urceolata and Porphyra yezoensis are shown and proposed to be owing to different numbers of excited pigments available and chromophore architectrue in R-PE from different biological sources.

Paper Details

Date Published: 17 August 1994
PDF: 8 pages
Proc. SPIE 2137, Time-Resolved Laser Spectroscopy in Biochemistry IV, (17 August 1994); doi: 10.1117/12.182764
Show Author Affiliations
Xiguang Zheng, Zhongshan Univ. (China)
He Zhou Wang, Zhongshan Univ. (China)
Fuli Zhao, Zhongshan Univ. (China)
Zhaolan Gao, Zhongshan Univ. (China)
Zhenxin Yu, Zhongshan Univ. (China)
Jinchang Zhu, Institute of Photographic Chemistry (China)
Andong Xia, Institute of Photographic Chemistry (China)
Lijin Jiang, Institute of Photographic Chemistry (China)


Published in SPIE Proceedings Vol. 2137:
Time-Resolved Laser Spectroscopy in Biochemistry IV
Joseph R. Lakowicz, Editor(s)

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