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′.
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Mazaki et al. (1988) studied this question.
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