Effect of ionic liquid on the polarity and size of the reverse micelles in supercritical CO2

Li, Junchun; Zhang, Jianling; Han, Buxing; Gao, Yanan; Dong, Song; Wu, Zhonghua

doi:10.1016/j.colsurfa.2006.01.005

Cited by 27 publications

(23 citation statements)

References 32 publications

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“…As a result, water-soluble drug molecules can be encapsulated inside the reverse micellar core. Structure of the reverse micelles has been found to be much bigger than the empty micelles 51 . Besides, water has been shown to induce micellization in nonaqueous systems 52 .…”

Section: Methodsmentioning

confidence: 99%

Structure of Diglycerol Polyisostearate Nonionic Surfactant Micelles in Nonpolar Oil Hexadecane: A SAXS Study

Shrestha

Oyama

et al. 2010

J. Oleo Sci.

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Using a small-angle X-ray scattering technique, shape and size, and internal structure of diglycerol polyisostearate nonionic surfactant micelles in nonpolar oil n-hexadecane (HD) were investigated at 25 . Furthermore, the effect of added water on the structure of host reverse micelles was also investigated. The scattering data were evaluated by the generalized indirect Fourier transformation (GIFT) method and model fi ttings. It was found that diglycerol polyisostearate (abbreviated as (iso-C 18 ) n G 2 , where n = 2-4 represent the number of isostearate chain per surfactant molecule) spontaneously form reverse micelles in HD at 25 and their geometry (shape and size, and internal structure) could fl exibly be controlled by a small change in the lipophilic tail architecture of the surfactant, temperature, and water addition. Increasing number of isostearate chain per surfactant molecule decreases the micelles size favoring prolate-to-sphere type transition. This phenomenon could be best understood due to voluminous lipophilic part of the surfactant. Increasing temperature decreases the size of the reverse micelles due to enhanced interpenetration of the surfactant chain and the oil and also due to dominant hydrophobic character of the surfactant at higher temperatures. In the studies of effect of added water on the structure of micelles, it was found that the reverse micelles swell with water causing two dimensional micellar growths.

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Section: Methodsmentioning

confidence: 99%

Structure of Diglycerol Polyisostearate Nonionic Surfactant Micelles in Nonpolar Oil Hexadecane: A SAXS Study

Shrestha

Oyama

et al. 2010

J. Oleo Sci.

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“…The micro-polarity and the size of the reversed micelles, in general, increase considerably with the increase in amount of solvent, even for very low salt concentrations. 132 Although the application of reversed micellar systems in biotechnological extraction/purification processes is recent, its success is well documented in the literature. One of the first works describes the extraction of concanavalin A with the anionic surfactant AOT and a biological surfactant as the affinity cosurfactant.…”

Section: Reversed Micellar Systemsmentioning

confidence: 99%

“…One of the first works describes the extraction of concanavalin A with the anionic surfactant AOT and a biological surfactant as the affinity cosurfactant. 132 The authors' research group has been working on reversed micellar extraction for over a decade and some interesting results were obtained, especially regarding enzyme purification. In one of the first investigations, the extraction of the enzyme inulinase from K. marxianus into a reversed micelle phase of the cationic surfactant BDBAC in isooctane/hexanol was demonstrated, with a recovery yield of 87% and a purification factor of 2.8.…”

Section: Reversed Micellar Systemsmentioning

confidence: 99%

Liquid–liquid extraction of biomolecules: an overview and update of the main techniques

Mazzola

Lopes

Hasmann

et al. 2007

J of Chemical Tech & Biotech

205

119

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Two-phase systems can be exploited in separation science for the extraction/purification of desired biomolecules. This article reviews recent experimental work on the use of aqueous two-phase polymer systems, two-phase aqueous micellar systems and reversed micellar systems for the extraction/purification of biomolecules. The experimental partitioning behavior of different biomolecules is reviewed and new results with nisin and lipopolysaccharides are presented. An extensive description of each system is presented, based on the biomolecules behavior and the tools employed to improve their extraction and purification.

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“…Ionic liquids and supercritical fluids are widely used non-conventional systems which have been used in many different fields of applications, as well as microemulsion research (Zhang et al, 2006, Tingey et al, 1991, Eastoe et al, 1991, Johnston et al, 1996. Among the supercritical fluids, carbon dioxide, because of its non-toxicity, cheapness and easy availability, has been used as solvent for different purposes, such as extraction and polymerizations.…”

Section: Microemulsions In Non-conventional Systemsmentioning

confidence: 99%

Microemulsions - A Brief Introduction

Najjar¹

2012

Microemulsions - An Introduction to Properties and Applications

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Effect of ionic liquid on the polarity and size of the reverse micelles in supercritical CO2

Cited by 27 publications

References 32 publications

Structure of Diglycerol Polyisostearate Nonionic Surfactant Micelles in Nonpolar Oil Hexadecane: A SAXS Study

Structure of Diglycerol Polyisostearate Nonionic Surfactant Micelles in Nonpolar Oil Hexadecane: A SAXS Study

Liquid–liquid extraction of biomolecules: an overview and update of the main techniques

Microemulsions - A Brief Introduction

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