Effects of additives on the structure of rhamnolipid (biosurfactant): A small-angle neutron scattering (SANS) study

被引：53

作者：

Dahrazma, Behnaz ^{[2
]}

Mulligan, Catherine N. ^{[1
]}

Nieh, Mu-Ping ^{[3
]}

机构：

[1] Concordia Univ, Dept Bldg Civil & Environm Engn, Montreal, PQ H3G 1M8, Canada

[2] Shahrood Univ Technol, Fac Earth Sci, Dept Geol Environm, Shahrood 31636199951, Iran

[3] Canadian Neutron Beam Ctr, Natl Res Council Canada, Steacie Inst Mol Sci, Chalk River, ON K0J 1J0, Canada

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2008年 / 319卷 / 02期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

SANS; rhamnolipids; heavy metals; soil remediation; micelle structure;

D O I：

10.1016/j.jcis.2007.11.045

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Pollution of soils and sediments by heavy metals is an environmental concern. Among the remedial techniques, soil washing is proving to be reliable. Biosurfactant rhammolipid has shown its potential as a washing agent. In this research, small angle neutron scattering (SANS) was employed to investigate the size and morphology of rhamnolipid aggregates and micelle structure in the presence of heavy metals Cu, Zn, and Ni. The results indicate the importance of the pH of the system in the morphology of the ag regates in the rhamnolipid solution. Creation of a basic condition by addition of 1% NaOH led to the formation of large aggregates (>2000 angstrom) + micelles with R-G similar to 17 angstrom while in the acidic environment with 1% NaCl, large polydisperse vesicles with a radius about 550-600 angstrom were formed. The size of the aggregates in both acidic and C basic condition is fine enough to ease the flow of the rhamnolipid solution through the porous media with the pore sizes as small as 200 nm. (c) 2007 Elsevier Inc. All rights reserved.

引用

页码：590 / 593

页数：4

共 21 条

[1]

Endotoxin-like properties of a rhamnolipid exotoxin from Burkholderia (Pseudomonas) plantarii:: immune cell stimulation and biophysical characterization [J].