How can the use of detergents within a protein assay effect the protein concentrations?

Detergent solution used in this protein assay to make up samples containing a specified concentration of BSA, aswell as detergent.
Answers:
The presence of nonionic and cationic detergents interfered in the Lowry method of protein estimation by causing precipitate formation. The addition of 0.5% sodium dodecylsulphate contained by the alkali reagent prevented this precipitation without affecting colour development, and allowed the method to be used on detergent treated membrane preparations.

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