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Biophysical Journal 3: 99-113 (1963)
© 1963 the Biophysical Society

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Studies of Colloidal Chlorophyll in Aqueous Dioxane

Bruce B. Love and T. T. Bannister

ABSTRACT

The preparation and properties of a colloidal state of pure chlorophyll a in aqueous dioxane are described. The red absorption maximum is at 685± 1 mµ, depending on buffer concentration. The typical 672 mµ colloid (obtained by diluting an acetone solution with water) can be converted directly to the 685 mµ colloid by the addition of 1 M dioxane. The 672 -> 685 mµ conversion is irreversible and is second order with respect to both 672 colloid and dioxane. It is shown that the formation of the 685 mµ colloid of chlorophyll a requires the Mg atom; no dioxane species is obtained with pheophytin or ethyl pheophorbide. Furthermore, of the transition metal salts of chlorophyll, Cu, Co, Ni, and Zn, only the Zn salt interacts with dioxane.






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Copyright © 1963 by the Biophysical Society.