二维界面上偶氮苯糖脂的光响应行为

发布时间：2018-05-01 03:25

本文选题：LB技术 + 偶氮苯糖脂　；参考：《物理化学学报》2017年04期

【摘要】：设计合成了含偶氮苯基团的糖脂Gal-azo-Cn,通过Langmuir Blodgett(LB)膜、原子力显微镜技术对该糖脂在气液界面上的光异构化行为进行研究。实验表明,气液界面上的纯偶氮苯糖脂及与磷脂混合形成单分子膜的偶氮苯糖脂均具有反-顺、顺-反异构化行为。紫外光引起的异构化过程导致表面压力上升,但是由于二维界面上膜压的存在对其反-顺异构化行为有抑制作用,膜压越大,压力上升越小,黑暗环境中顺-反异构化过程则越快。对比纯偶氮苯糖脂的界面异构化行为,混合体系中磷脂分子与偶氮苯糖脂分子间的相互作用,对二维界面上糖脂的反-顺异构化有促进作用,提高了偶氮苯糖脂的反-顺异构化程度。磷脂-糖脂混合体系中,混合组分中含不饱和碳链的磷脂含量越高,膜的流动性越强,稳定性越差,对偶氮苯糖脂异构化行为的促进作用越弱。
[Abstract]:The glycolipid Gal-azo-Cn containing azophenyl group was designed and synthesized. The photoisomerization behavior of glycolipid at the gas-liquid interface was studied by Langmuir Blodgett-LB film and atomic force microscopy. The results show that the pure azobenzene glycolipid at the gas-liquid interface and the azobenzene glycolipid mixed with phospholipid have transisomerization behavior. The isomerization process induced by ultraviolet light causes the surface pressure to rise, but the existence of membrane pressure at the two-dimensional interface can inhibit the transcis-isomerization behavior, the higher the membrane pressure, the smaller the pressure rise. The faster the process of cis-trans isomerization in dark environment. Compared with the interfacial isomerization behavior of pure azobenzene glycolipid, the interaction between phospholipids and azobenzene glycolipid molecules in the mixed system can promote the trans-cis-isomerization of glycolipid at the two-dimensional interface. The degree of trans-cis isomerization of azobenzene glycolipid was improved. The higher the phospholipid content of unsaturated carbon chain, the stronger the fluidity and stability of the membrane, and the weaker the effect on the isomerization of azobenzene glycolipid.
【作者单位】：华东理工大学化学与分子工程学院结构可控先进功能材料及其制备教育部重点实验室;
【基金】：国家自然科学基金(21276074,91334203) 中央高校基本科研基金资助项目~~
【分类号】：O647.2

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