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  • Effect of the ionic liquid 1-ethyl-3-methylimidazolium acetate on the phase transition of starch: dissolution or gelatinization?

Effect of the ionic liquid 1-ethyl-3-methylimidazolium acetate on the phase transition of starch: dissolution or gelatinization?

Carbohydrate polymers (2013-04-03)
Sainimili Mateyawa, David Fengwei Xie, Rowan W Truss, Peter J Halley, Timothy M Nicholson, Julia L Shamshina, Robin D Rogers, Michael W Boehm, Tony McNally
ABSTRACT

This work revealed that the interactions between starch, the ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), and water might contribute to the phase transition (gelatinization, dissolution, or both) of native starch at reduced temperature. Using mixtures of water and [Emim][OAc] at certain ratios (7.2/1 and 10.8/1 mol/mol), both the gelatinization and dissolution of the starch occur competitively, but also in a synergistic manner. At lower [Emim][OAc] concentration (water/[Emim][OAc] molar ratio≥25.0/1), mainly gelatinization occurs which is slightly impeded by the strong interaction between water and [Emim][OAc]; while at higher [Emim][OAc] concentration (water/[Emim][OAc] molar ratio≤2.8/1), the dissolution of starch is the major form of phase transition, possibly restricted by the difficulty of [Emim][OAc] to interact with starch.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Starch, puriss. p.a., from potato, reag. ISO, reag. Ph. Eur., soluble
Sigma-Aldrich
Amylose from potato, used as amylase substrate
Supelco
Starch from corn, for use with Total Dietary Fiber Control Kit, TDF-C10
Supelco
Starch from corn, analytical standard, analytical standard for Starch Assay Kits SA-20 and STA-20
Sigma-Aldrich
Starch from corn
Sigma-Aldrich
Starch from potato, Powder
Sigma-Aldrich
Starch from corn, practical grade
Sigma-Aldrich
Starch from corn, Unmodified waxy corn starch of essentially pure amylopectin; contains only trace amounts of amylose.
Sigma-Aldrich
Starch from rice
Sigma-Aldrich
Starch from wheat, Unmodified
Sigma-Aldrich
Starch from potato, suitable for electrophoresis
Sigma-Aldrich
Starch from potato, Soluble
Sigma-Aldrich
Starch, from potato, tested according to Ph. Eur.