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A simple micromethod for collagen and total protein determination in formalin-fixed paraffin-embedded sections
A Lopez-De Leon and M Rojkind
A simple, sensitive, and quantitative procedure is described for the measurement of collagen and protein content in tissue sections prepared from formalin-fixed paraffin-embedded samples. The method can detect as little as 5.7 micrograms of collagen per mg of protein. It is based on the selective binding of Sirius red F3BA and Fast green FCF to collagen and noncollagenous components, respectively, when the sections are stained with both dyes dissolved in aqueous saturated picric acid. Both dyes are eluted readily and simultaneously with NaOH-methanol and the absorbances obtained at 540 and 605 nm can be used to determine the amount of collagen and protein. The color equivalence of each dye was determined after destaining the sections and measuring the collagen content by hydroxyproline analysis and the amount of protein by the micro-Kjeldahl procedure. When several sections prepared from five rat tissues were analyzed first by the dye binding method and then by the chemical procedure, comparable results were obtained. This method could be of use in measuring collagen in tissue specimens and could be helpful in assessing the degree of fibrosis in tissue samples and in evaluating the effects of antifibrogenic drugs currently in use.
Volume 33,
Issue 8,
pp. 737-743,
08/01/1985
Copyright © 1985 by The Histochemical Society
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