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Influence of the surfactant headgroup on the activity of horseradish peroxidase(HRP)was investigated after incubating the protein in buffered(10 mM phosphate solution)sodium dodecyl sulfate(SDS),dodecyl trimethyl ammonium bromide(DTAB)and N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate(SB3-12),which have the same hydrophobic tail but different hydrophilic headgroups.