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자료유형
학술저널
저자정보
Hirai, Yuki (Department of Chemistry, Faculty of Science and Engineering, Kinki University) Tamiaki, Hitoshi (Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University) Kashimura, Shigenori (Department of Chemistry, Faculty of Science and Engineering, Kinki University) Saga, Yoshitaka (Department of Chemistry, Faculty of Science and Engineering, Kinki University)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제12호
발행연도
2009.1
수록면
1,701 - 1,707 (7page)

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Demetalation kinetics of natural chlorophyll (Chl) d purified from Acaryochloris marina was first studied and compared with those of Chls a and b. The demetalation rate constant of Chl d, which possessed a formyl group at the 3-position, was five-fold smaller than that of Chl a possessing a vinyl group at the same position in aqueous acetone at the proton concentration of $1.2{\times}10^{-3}M$ at $25^{\circ}C$. In contrast, the demetalation rate constant of Chl b possessing a formyl group at the 7-position was 26 times smaller than that of Chl a. The activation energy of demetalation reaction of Chl d was larger than that of Chl a, but smaller than that of Chl b. These indicate that the substitution effect of 3-formyl group on the acidic removal of central magnesium in Chls was smaller than that of 7-formyl group.

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