Interaction of DNA with cationic micelles: Effects of micelle surface charge density, micelle shape, and ionic strength on complexation and DNA collapse

被引：85

作者：

Wang, YL ^{[1
]}

Dubin, PL ^{[1
]}

Zhang, HW ^{[1
]}

机构：

[1] Indiana Univ Purdue Univ, Dept Chem, Indianapolis, IN 46202 USA

来源：

LANGMUIR | 2001年 / 17卷 / 05期

关键词：

D O I：

10.1021/la0010673

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Complexation between DNA and cationic/nonionic micelles of dodecyldimethylamine oxide (DMDAO) at various ionic strengths (I) was studied by monitoring turbidity or dynamic light scattering as a function of pH at various ionic strengths (I). Complexation takes place at a critical degree of micelle protonation (beta (c)) and is therefore primarily controlled by the ratio of cationic:nonionic surfactant, not by the ratio of surfactant:DNA. beta (c) corresponds to a critical micelle surface charge density (sigma (c)), which increases nearly linearly with I. The dependence of beta (c) on I displays a discontinuity when the DMDAO micelle shape changes from spherical to rodlike. The proximity of the complexation boundary to the coil/coil-globule coexistence boundary reported from fluorescence microscopy(1) indicates that the DNA-micelle complexation observed by scattering also corresponds to micelle-induced collapse of DNA.

引用

页码：1670 / 1673

页数：4

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