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Vol. 28 No. 6 (2016): Vol 28 Issue 6

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Determination of Solubility of Starch in Selected Ionic Liquids by Turbidimetry

https://doi.org/10.14233/ajchem.2016.19705
Zhigang Luo
Carbohydrate Lab, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, P.R China
Guangyin Ji
Carbohydrate Lab, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, P.R China
Xuanxuan Lu
Carbohydrate Lab, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, P.R China

Corresponding Author(s) : Zhigang Luo

zhgluo@scut.edu.cn

Asian Journal of Chemistry, Vol. 28 No. 6 (2016): Vol 28 Issue 6

Abstract

A novel method was investigated to determine the solubility of starch in ionic liquids based on the turbidity of the solution. This method was used to monitor the dissolving capability of 1-butyl-3-methylimidazolium chloride ([C4C1im][Cl]) and 1-butyl-3-methyl-imidazolium acetate ([C4C1im][Ac]). Quantitative solubility of three starches (normal maize starch, waxy maize starch and high-amylose maize starch) in two selected ionic liquids (ILs) was studied. The solubilities of normal maize, waxy maize and high-amylose maize starches measured by turbidimetry were 10.750, 10.252 and 11.003 g/100 g of [C4C1im][Cl] at 100 °C, respectively. In [C4C1im][Ac], the solubility measured was 9.501, 9.250 and 9.752 g/100 g of ionic liquid at 100 °C, respectively. The influence of water content on the real dissolution of starch in these two ionic liquids was investigated. The theoretical amount of anhydrous starch dissolved in ionic liquid at different temperatures was also determined by extrapolation methodology.

Keywords

Starch dissolution Ionic liquids Turbidimetric measurements
Luo, Z., Ji, G., & Lu, X. (2016). Determination of Solubility of Starch in Selected Ionic Liquids by Turbidimetry. Asian Journal of Chemistry, 28(6), 1361–1366. https://doi.org/10.14233/ajchem.2016.19705
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