[天青A与十二烷基硫酸钠在胶束形成前颜色变化机制的研究]

[Study on the mechanism of color changes of Azur A and sodium dodecyl sulphate before micelle formation].

作者信息

Cao Wen-Gen, Jiao Qing-Cai

机构信息

Department of Chemistry and Life Science, Suzhou College, Suzhou 234000, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Jan;28(1):134-7.

PMID:18422136

Abstract

The mechanism of color changes of sodium dodecyl sulphate(SDS) and Azur A (AA) before micelle formation was studied by spectral probe. The changes in the absorption spectra of SDS-AA and chondroitin sulfate(CS)-AA complexes were compared. The influence of ethanol and NaCl on the absorption spectra of SDS-AA complex was investigated. It was found that SDS-AA system showed color changes from blue to amaranth to blue due to the difference in the spatial orientation aggregative degree of AA binding on SDS regular aggregate. The critical concentration of premicelle formation (CPC) was found to be 1.0 x 10(-4) mol x L(-1) by the relation between c(SDS) and deltaA498/deltac(SDS).

摘要

采用光谱探针研究了十二烷基硫酸钠（SDS）与天青A（AA）在胶束形成前颜色变化的机制。比较了SDS - AA和硫酸软骨素（CS） - AA复合物吸收光谱的变化。研究了乙醇和氯化钠对SDS - AA复合物吸收光谱的影响。结果发现，由于AA在SDS规则聚集体上结合的空间取向聚集程度不同，SDS - AA体系呈现出从蓝色到紫红色再到蓝色的颜色变化。通过c（SDS）与ΔA498/Δc（SDS）之间的关系，发现预胶束形成的临界浓度（CPC）为1.0×10⁻⁴ mol·L⁻¹。