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HERO ID
157667
Reference Type
Journal Article
Title
Effects of nano-anatase TiO2 on absorption, distribution of light, and photoreduction activities of chloroplast membrane of spinach
Author(s)
Mingyu, S; Fashui, H; Chao, L; Xiao, W; Xiaoqing, L; Liang, C; Fengqing, G; Fan, Y; Zhongrui, L
Year
2007
Is Peer Reviewed?
Yes
Journal
Biological Trace Element Research
ISSN:
0163-4984
EISSN:
1559-0720
Volume
118
Issue
2
Page Numbers
120-130
Language
English
PMID
17873354
DOI
10.1007/s12011-007-0006-z
Web of Science Id
WOS:000249290200004
Abstract
The effects of nano-anatase TiO2 on light absorption, distribution, and conversion, and photoreduction activities of spinach chloroplast were studied by spectroscopy. Several effects of nano-anatase TiO2 were observed: (1) the absorption peak intensity of the chloroplast was obviously increased in red and blue region, the ratio of the Soret band and Q band was higher than that of the control; (2) the great enhancement of fluorescence quantum yield near 680 nm of the chloroplast was observed, the quantum yield under excitation wavelength of 480 nm was higher than the excitation wavelength of 440 nm; (3) the excitation peak intensity near 440 and 480 nm of the chloroplast significantly rose under emission wavelength of 680 nm, and F 480 / F 440 ratio was reduced; (4) when emission wavelength was at 720 nm, the excitation peaks near 650 and 680 nm were obviously raised, and F 650 / F 680 ratio rose; (5) the rate of whole chain electron transport, photochemical activities of PSII DCPIP photoreduction and oxygen evolution were greatly improved, but the photoreduction activities of PSI were a little changed. Together, the studies of the experiments showed that nano-anatase TiO2 could increase absorption of light on spinach chloroplast and promote excitation energy to be absorbed by LHCII and transferred to PSII and improve excitation energy from PSI to be transferred to PSII, thus, promote the conversion from light energy to electron energy and accelerate electron transport, water photolysis, and oxygen evolution.
Keywords
nano-anatase TiO2; spinach; chloroplast; energy distribution; photochemical activity
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