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Pheophytinization of Chlorophyll a and Chlorophyll a ′ in Aqueous Acetone

1988; Oxford University Press; Volume: 61; Issue: 8 Linguagem: Inglês

10.1246/bcsj.61.2969

1348-0634

Hitoshi Mazaki, Tadashi Watanabe,

Light effects on plants

Abstract Chlorophyll (Chl) a and its C-10 epimer, Chl a′, are compared for pheophytinization (demetallation) kinetics in aqueous acetone containing HCl. For each pigment the pheophytinization rate is of second order with respect to proton, and under identical conditions Chl a′ is pheophytinized by roughly 50% faster than Chl a, due probably to weaker Mg–N bonds in Chl a′.