离子表面活性剂和胶原间的相互作用(英文)

INTERACTION OF IONOGENIC SURFACTANTS WITH TANNED COLLAGEN

研究了二十烷基苯磺酸钠 (SDBS)和溴化十六烷基吡啶翁 (CPB)表面活性剂同胶原纤维(BAT)的反应。在酸性环境 (pH =3 )和等电点条件 (CrBATpH =6.5 ,SBATPH =4)决定了吸附作用等温线。同时 ,研究了底物的膨胀变化 (用αm表示膨胀度 )。已经证实了离子表面活性剂对铬鞣和植物鞣胶原的吸收。发现SDBS对CrBAT的吸收与反应的 pH值无关而取决于铬进一步吸收的活性位置的含量。在酸性区域 ,结合SDBS不使CrBAT纤维膨胀 ,而CrBAT在等电点条件下存在较轻微的膨胀。CPB与CrBAT的结合量较小 ,在同样的反应条件下 ,CPB在 pH =6.5时的吸收实际与其对未鞣的BAT的吸收相同。靠SBAT在高 pH值下的稳定性 ,离子表面活性剂对SBAT的吸收要在 pH =4时有效。预测SBDS的吸收更低 ,但等温线是S形相对于c.m .c .SDBS有一个滞后的段。CPB—SBAT和SDBS—BAT反应 。

The object of study was an interaction of anionactive (sodium dodecyLbenzene sulphonate-SDBS)and cationactive(Cetylpyridinium bromide-(CPB)surfactants with collagen fibres (BAT) tanned with Cr (Ⅲ)salts(CrBAT)and/or synthetic tanning agent Kortan FB(SBAT).Sorption isotherms were determined in an acid environment(pH=3)and under isoelectric conditions(pH=6.5 for CrBAT,pH=4 for SBAT).At the same time,changes in swelling of both substrates were investigated(expressed as mass swelling degree α m).Well-known facts were confirmed related to sorption of iongenic surfactants to chrome-tanned and vegetable-tanned collagen.Sorption of SDBS to CrBAT was found to depend,heedless of reaction pH,on content of Cr fulfilling the role of a further active sorption site.In the acid region,bound SDBS causes deswelling of Cr BAT fibres,while CrBAT under isoelectric conditions exhibits no marked swelling.CPB is bound to CrBAT is a minor quantity.Sorption of CPB at pH=6.5 is practically the same as sorption of CPB to untanned BAT under same reaction conditions.Sorption of both surfactants to SBAT was performed only at pH=4 owing to instability of SBAT at higher pH values.As expected,sorption of SBDS is lower,but the isotherm is S-shaped with a lag phase corresponding to c.m.c. SBDS .Isotherm of the CPBSBAT system has the same shape(S-isotherm).The bound amout of CPB exceeds concentration of anticipated sorption sites,which is explained by the existence of further centres in the complex of synthetic tanning agent-collagen.As opposed to SDBS-CrBAT and SDBS-BAT interactions,a slight fibre swelling takes place during sorption of CPB to BAT.