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Circular dichroism and structure of the complex of acridine orange with poly(L-glutamic acid)

✍ Scribed by Toyoko Imae; Shoichi Ikeda

Publisher
Wiley (John Wiley & Sons)
Year
1976
Tongue
English
Weight
646 KB
Volume
15
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

Circular dichroism and absorption spectra have been measured on solutions of acridine orange and poly(L‐glutamic acid) mixed at two molar ratios of carboxyl group‐to‐dye, P/D 25 and 0.8, and at different pH's. Characteristic circular dichroism is induced at the absorption bands of acridine orange when the P/D is 25 and the solution is acidic. Another type of circular dichroism is manifest at neutral and alkaline pH when P/D is 0.8. For the induction of the former type of circular dichroism, a helical array of acridine‐orange dimers bound to the α‐helix is postulated, in which the dye molecular planes are almost perpendicular to the helical axis. Assuming the helical geometry and optical parameters, combined with the observed magnitude of transition electric moment, the rotatory strength of the complex is calculated to the zeroth order approximation, and the observed circular dichroism spectra have been reproduced.

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