色素与唾液相互作用的吸附动力学研究

时间:2022-10-12 01:26:37

色素与唾液相互作用的吸附动力学研究

[摘要] 目的 通过表面等离子体共振(SPR)技术在分子水平上原位、实时和动态监测茶黄素(TF)、姜黄素(Cur)和矢车菊素(Cy)吸附于人全唾液(WS)表面的过程。方法 运用SPR技术和Langmuir、Freundlich模型确定色素与WS之间的亲和力及色素吸附于WS表面的结合速率常数ka、解离速率常数kd、结合平衡常数KA和解离平衡常数KD。数据用单因素方差分析和SNK-q检验处理。结果 3种色素之间的ka、kd、KA和KD的差异具有统计学意义(PCur>Cy(P

[关键词] 唾液; 色素; 表面等离子体共振技术

[中图分类号] R 339.1 [文献标志码] A [doi] 10.3969/j.issn.1000-1182.2012.03.004

Adsorption dynamics study on interactions of pigments and human whole saliva Li Shuigen1, Yao Jiangwu1,2. (1. Dept. of Prosthodontics, School of Stomatology, Fujian Medical University, Fuzhou 350002, China; 2. Dept. of Prosthodontics, Xiamen Stomatological Hospital, Xiamen 361003, China)

[Abstract] Objective In situ, real timely and dynamically monitoring the processes of theaflavin(TF), curcumin

(Cur) and cyanidin(Cy) binding to human whole saliva(WS) surface has been investigated by surface plasmon resonance(SPR) technique at the molecular level. Methods The affinity between pigments and WS, association rate constant(ka), dissociation rate constant(kd), association equilibrium constant(KA) and dissociation equilibrium constant(KD) of pigments binding on WS surface had been determined by SPR and the Langmuir model as well as the Freundlich mo-del. The data were analyzed by one-way ANOVA and SNK-q test. Results There were significant differences among TF, Cur and Cy in ka, kd, KA and KD(P

surface could be better described by the Freundlich model than the Langmuir model. The pigments adsorption on WS surface was dominant by specific interactions, such as hydrogen bonding. The affinity of pigments to WS were TF>Cur>Cy(P

[Key words] saliva; pigment; surface plasmon resonance technique

在日常生活中,茶、红酒和食用色素是天然牙最易接触到的着色物。茶黄素(theaflavin,TF)、姜黄素(curcumin,Cur)和矢车菊素(cyanidin,Cy)是分别来自于茶叶、姜黄和葡萄的提取物,广泛应用于食品添加剂中[1]。作为色源体的天然色素与人全唾液

(whole saliva,WS)作用,可以沉积于牙面形成色渍,还可以与唾液蛋白结合,抑制蛋白质的活性,使口腔黏膜产生干燥和皱缩感[2]。表面等离子体共振(sur-face plasmon resonance,SPR)技术可以将蛋白质分子自组装于SPR传感器芯片表面,特别适合于研究聚合物高分子与蛋白质之间的相互作用。本研究利用SPR技术,将WS自组装于芯片表面,考察色素TF、Cur和Cy吸附于WS表面的动态全过程,分析色素与WS蛋白质分子之间的相互作用和亲合力,探讨物体表面着色物形成和干燥及皱缩感产生的机制。

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