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Model studies on the acriflavine-Feulgen reaction

EM van Ingen, HJ Tanke and JS Ploem

The specificity and quantitative reliability of the Feulgen-acriflavine- SO2 procedure was tested on polyacrylamide model films containing DNA. Noncovalent binding of acriflavine to DNA was observed when the washing procedure, as used in the classical way, was applied. The noncovalently bound acriflavine could be removed with an extra wash in acid-ethanol. The presence of SO2 in the staining solution has been found to enhance covalent binding significantly. The absorbance of films stained by our Feulgen-acriflavine-SO2 procedure is directly proportional to that obtained by the classical Feulgen-pararosanilline-SO2 procedure. The acriflavine-Feulgen procedure has also been tested using a commercial and a purified dye. The use of purified acriflavine, compared to a commercial sample did not result in a significant difference in the maximum absorbance value of stained DNA nor in the absorption or the fluorescence emission spectra of acriflavin covalently bound to DNA.

Volume 27, Issue 1, pp. 80-83, 01/01/1979
Copyright © 1979 by The Histochemical Society


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