Abstract
The method of protein determination reported by Lowry et al. (1951, J. Biol. Chem. 193, 265–275) has been adapted for use with 96-well microtiter plates and an automatic microplate spectrophotometer. The spectrophotometer has been interfaced with a computer which plots the standard curve and calculates the protein content of each sample. The adapted method offers advantages over previously reported methods in that it is more rapid and uses a smaller sample volume (100 μl) for samples containing 3–300 μg/ml (0.3–30 μg/assay) of protein. The method of Bensadoun and Weinstein (1976, Anal. Biochem. 70, 241–252) for precipitating microgram amounts of protein away from substances which interfere with the Lowry assay has also been adapted to this microplate procedure. These techniques should be particularly useful for laboratories where large numbers of samples containing a wide range of protein concentrations are assayed.
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