A fluorescence study of the interactions between sodium alginate and surfactants

被引：43

作者：

Neumann, MG ^{[1
]}

Schmitt, CC ^{[1
]}

Iamazaki, ET ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

CARBOHYDRATE RESEARCH | 2003年 / 338卷 / 10期

基金：

巴西圣保罗研究基金会;

关键词：

alginates; surfactants; pre-micelles; hydrophobic microdomains;

D O I：

10.1016/S0008-6215(03)00051-X

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The interactions between the polysaccharide alginate with charged ionic surfactants (anionic and cationic) in aqueous solution have been investigated using pyrene as a photophysical probe. Static fluorescence determinations have been used to obtain information about the new microenvironments arising by these interactions. Micropolarity studies using the I-1/I-3 ratio of the vibronic bands and IEIM ratio between the excimer and monomer emissions of pyrene shows the formation of hydrophobic domains. The interactions between the natural polyelectrolytes and the oppositely charged surfactants lead to the formation of pre-micelles at surfactant concentrations lower than the CMC of the surfactants. The aggregation process is assumed to be due to electrostatic attraction. On the other side, systems containing an anionic surfactant do not show the same behaviour at low concentrations. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：1109 / 1113

页数：5