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Abstract in aqueous dimethyl sulfoxide(DMSO) solution, chlorophyll a (chl a) aggregated to give several colloidal forms; these were spectroscopically characterized as A-683, A-695, and colorless one. The water/DMSO ratio was the determining factor of the type of form obtained. The spectrum of A-683, which formed in 30–50 v/v % aqueous DMSO solution, was conspicuous bacause of its very high and narrow absorption band at 683±1 nm. The spectroscopic transition among these aggregated forms of chl a in aqueous DMSO is described.
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Uehara et al. (1982) studied this question.
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