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A new resonance light scattering (RLS) assay of proteins is presented. In the citric acid-NaOH (pH 2.35) buffer, the RLS of Resorcinol yellow (RY)-protein system can be greatly enhanced by addition of nonionic surfactant OP, owing to the interaction between OP and RY-protein. The enhanced RLS is in proportion to the concentration of proteins in the range 0.02-4.0 μg ml -1 for both bovine...
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