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The effect of ethidium bromide on the liquid crystalline phases of aqueous DNA
Author(s) -
Gottarelli Giovanni,
Spada Gian Piero,
Mariani Paolo,
De Morais Monica Miranda
Publication year - 1991
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.530030404
Subject(s) - chemistry , ethidium bromide , aqueous solution , bromide , dna , combinatorial chemistry , chromatography , organic chemistry , biochemistry
The influence of the intercalation of ethidium bromide (EB) on the characteristics of the DNA cholesteric and hexagonal mesophases is studied by optical microscopy, circular dichroism, and X‐ray diffraction. The distance between DNA rods in the hexagonal phase is not modified by the presence of EB whereas the pitch of the cholesteric mesophase is considerably shortened by the dye. This seems to be related to the stereochemical effect of the intercalation rather than to the presence of a random distribution of the positive charge of the dye.