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- W1982160785 abstract "A number of substances commonly found in solutions in which deoxyribonucleic acid (DNA) is to be measured were tested for their effects on the color developed during the assay for DNA by methods using the indole, diphenylamine, and cysteine reactions. Mercaptoethanol and dithiothreitol produced marked changes in the color developed by all the reactions. Other compounds which seriously affected the color developed by one or more of the reactions included sodium citrate, tris(hydroxymethyl)aminomethane, ethylenediaminetetraacetate, sodium nitrate, sodium phosphate, and ammonium sulfate. An equation was derived which relates the absorbance that is observed in the presence of a known concentration of an interfering substance to the absorbance that would be observed in its absence. The constants necessary for solving this equation were determined for 18 substances that interfere with one or more of the reactions studied. The range of concentrations of DNA over which Beer's law applies, and therefore over which the equation is valid, was estimated for some of the substances tested. The data obtained for this study were also used to estimate the precision and sensitivity of these colorimetric methods. The Dische diphenylamine method was found to provide the best combination of precision and ease of performance for many routine purposes. The Burton diphenylamine method and a method based on the indole reaction were found to be the most precise and sensitive of those studied. The Burton method is easy to perform under routine conditions, but the results of analysis are delayed by a lengthy incubation and the reagents require careful purification. Both diphenylamine methods were found to be subject to interference by many substances commonly present in solutions of DNA. The method based on the indole reaction was found to be relatively free from interference. It requires more manipulations than the others, but it is often the best choice when interfering substances are present. A method based on the cysteine reaction showed poor reproducibility under routine use and it proved to be the most troublesome of the four to perform." @default.
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- W1982160785 date "1968-11-01" @default.
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- W1982160785 title "Effect of interfering substances on colorimetric reactions for deoxyribonucleic acid" @default.
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- W1982160785 doi "https://doi.org/10.1016/0003-2697(68)90336-9" @default.
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