Abstract: The properties of alkyl polyxylosidase (AX) with different carbon chain length and average polymerization degree (DP) were evaluated.The results show that AX can reduce the surface tension of water to below 26 mN/m.The critical micelle concentration (cmc) and surface excess concentration (Г_max) of AX are decreased with the increasing length of carbon chain,and the Г_max is higher than that of alkyl polyglycoside (APG) with the same carbon chain.The foaming ability,foam stability,hard water resistance and wetting power of AX are all superior to that of APG with the same carbon chain.With the increase of DP of AX,the cmc and the surface tension at cmc (γ_cmc) are both increased,and the Г_max is decreased.The DP of AX has no significant effect on the foaming ability.However,the hard water resistance,wetting power and emulsifying ability of AX are enhanced with the decrease of DP.

Key words: alkyl polyxylosidase, surface activity, average polymerization degree, application performance