双分子膜上染料的吸附性质及对膜结构的影响

系统地研究了染料甲基橙和达旦黄在含席夫碱基囊泡双分子膜阳离子表面上的吸附和聚集，以及由此产生的对膜聚集结构的影响，染料的吸附和聚集可经电子吸收光谱的因吸附产生的沉淀证实，并且ＭＯ的聚集结构的Ｈ－聚集，ＴＹ的聚集结构为Ｊ－聚集。改变ｐＨ的研究表明ＭＯ在变色ｐＨ值以及因形成阳离子而解聚，ＴＹ在酸性条件下亦因离子化程度减弱和部分质子化而使聚集被削弱，但在碱性条件下其聚集产生更大的红移。温度变化的结果显示

Adsorption, Aggregation of Dye Anions on the Surface of Aqueous Vesicle Bilayer and their Influence on Membrane Structure

Adsorption, aggregation and membrane structure of dye anions such as methyl orange(MO) and titan yellow(TY) on the cationic surface of vesicle bilayers containing schiff base were studied systen1etically. The adsorption and aggregation wcre revealed through the wavelength shift of absorption 1l1axinmm and precipitation produced in bianery mirture. Blue shift and red shift showed that the aggregate structure was H-aggregate for MO and J-aggregation for TY respectively. pH dependences of dyes in mixture systems indicatcd that the MO aggregates formed at high pH would be destroyed under low pH, which resulted from the cationic structure formation. TY aggregates were also disaggregated in considerable scale at low pH because of partial protonation, bnt strong red shitt occurred at high pH. With temperature mcreasing, the aggregation of (lyes would gradmally he disintegrated following tlle change states of vesicle bilayer from gel to liquid crystal and finally to molecular dnspersion.Differential Scann Scanning Calormetery(DSC) showed tllat the adsorption of dyes an action to decreasc the phase transition temperature of vesicle and tlle differntial spectra confirmed that the aggregate interaction of vesicle bilayer was weakened.