Abstract
A modification of the Lowry assay for the quantitative protein measurement in the presence of interfering materials has been developed. The method is based on a precipitation with a single-phase hexane:isopropanol solvent system and later resuspension of protein pellets with sodium dodecyl sulfate and deoxycholate. The new procedure eliminates the interference caused by Triton X-100, phospholipids, or dithiothreitol providing yields higher than 95% and seems to be especially suitable for protein determination on membrane preparations in samples with small volumes and/or very low protein concentrations.
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