OPTICAL ROTATORY DISPERSION OF CHLOROPHYLL IN SOLUTION AND IN CHLOROPLAST SUBUNITS

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Abstract
The ORD spectrum of pigmented lamellar fragments (quantasome aggregates) from spinach chloroplasts showed a number of strong Cotton effects associated with absorption bands in the red and blue regions of the spectrum. In the corresponding spectrum of a pigment extract these Cotton effects were strongly attenuated and reversed in sign. Purified chlrophyll a in solutions in carbon tetrachloride, an aggregating solvent, exhibited profound changes in its optical rotatory dispersion spectrum with changing concentration, and large Cotton effects are observed to be present at high concentrations where chlorophyll dimers are known to be stable. The observed dispersions in quanta-somes are interpreted to arise from strong interactions among aggregated pigment molecules in their lipoprotein matrix.

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