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Issue 12, 2009
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Demetalation kinetics of natural chlorophylls purified from oxygenic photosynthetic organisms: effect of the formyl groups conjugated directly to the chlorin π-macrocycle

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Abstract

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 × 10−3 M at 25 °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.

Graphical abstract: Demetalation kinetics of natural chlorophylls purified from oxygenic photosynthetic organisms: effect of the formyl groups conjugated directly to the chlorin π-macrocycle

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Publication details

The article was received on 10 Jun 2009, accepted on 27 Sep 2009 and first published on 19 Oct 2009


Article type: Paper
DOI: 10.1039/B9PP00018F
Citation: Photochem. Photobiol. Sci., 2009,8, 1701-1707
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    Demetalation kinetics of natural chlorophylls purified from oxygenic photosynthetic organisms: effect of the formyl groups conjugated directly to the chlorin π-macrocycle

    Y. Hirai, H. Tamiaki, S. Kashimura and Y. Saga, Photochem. Photobiol. Sci., 2009, 8, 1701
    DOI: 10.1039/B9PP00018F

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