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An evaluation of Coomassie Brilliant Blue as a stain for quantitative microdensitometry of protein in section

AH Cawood, U Potter and HG Dickinson

The specificity and stoichiometry of the binding of Coomassie Brilliant Blue (CBB) to protein in section has been examined using both frozen protein matrices and plant material. The maximum adsorbance of the stain, bound and in solution, was found to be 620 nm although variation in the results at this wavelength necessitated measurements to be made at 600 nm. After enzyme treatments of sectioned plant material embedded in resin, all CBB-binding biological material was shown to be sensitive to non-specific protease. The relationship between optical density at 600 nm and section thickness was tested statistically against the Lambert-Beer law, using microdensitometry of cryostat-sectioned, frozen genatine solution. The analyses showed conclusively that, under these conditions, CBB adheres strongly to the Lambert-Beer relationship. CBB may thus be considered as a very specific protein stain, eminently suited both to cytological observation and quantitative microdensitometry.

Volume 26, Issue 8, pp. 645-650, 08/01/1978
Copyright © 1978 by The Histochemical Society


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