Abstract
The adsorption of cationic surfactans onto keratin powder was studies to determine differences in alkyl chain length (C10C18). The adsorption isotherms of C10C14 cationics were of the Langmuir-type. Those of C16 and C18 cationics showed much stronger interaction with keratin powder than those of C10C14 cationics. Irreversible adsorption was also observed in the former. The kinetic frictional coefficient of keratin powder-adsorbed C10C18 cationics was measured. For C16 and C18 cationics, the values were less than those of C10C14 cationics. The amount of saturated adsorption, the sum of both hydrophobic and irreversible adsorption, increased in the order : C14>C16, C18>C12>C10.The antibacterial capacity of cationic surfactants against Staphylococcus aureus was assessed and interactions between cationic surfactants and ovalbumin were studied. The results in each case were found to be related to saturated adsorption. C14 showed the highest activity toward Staphylococcus aureus, ovalbumin and keratin powder regarless of the type of protein.
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