Effect of water and methanol on the dissolution and gelatinization of corn starch in [MMIM][(MeO)HPO₂]

Abstract

The effect of water and methanol on the dissolution and gelatinization of corn starch in [MMIM][(MeO)HPO2] was investigated by optical microscopy and differential scanning calorimetry. The presence of appropriate amount of water can accelerate the dissolution while the methanol is just opposite. The [MMIM][(MeO)HPO2]/water mass ratio of 7/3 is the best ratio for corn starch to disperse in [MMIM][(MeO)HPO2]-water mixture, since it can dissolve starch at lower temperature. When methanol was added to the mixture of [MMIM][(MeO)HPO2]/water 8/2 (w/w), methanol can accelerate the dissolving process of corn starch, since it can penetrate into the starch granules and swelled the out layer of granules with water. It is demonstrated that [MMIM][(MeO)HPO2]/water/methanol 8/2/3 (w/w/w) is a good mixed solvent like [MMIM][(MeO)HPO2]/water 7/3 (w/w) for corn starch.

Use of Ionic Liquids and Deep Eutectic Solvents in Polysaccharides Dissolution and Extraction Processes towards Sustainable Biomass Valorization

“…This discovery can explain the role of DMSO both in starch and cellulose dissolution as referred to above [ 212 ]. This effect was also noticed by Gao et al [ 213 ], who demonstrated a decrease either in temperature or time needed to solubilize 10 wt% of starch when DMSO was added to [C 2 C 1 im]Cl (1:1 in wt). However, it was noted that a complete destruction of the structure of starch granules may occur at high DMSO contents [ 213 ].…”

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“…Moreover, the presence of water in the solvent can affect the dissolution behavior. Liu et al, reported that the ratio of IL and water can improve the gelatinization or dissolution of corn starch in [MMIM][(MeO)·HPO 2 ] [21]. In this work, to avoid the risk of viscosity increase and precipitation of cellulose in the spinneret, preparation of cellulose/EmimAc solution was conducted in a nitrogen glove box, to precisely control the solution composition for the subsequent spinning.…”

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“…8). Shen et al 94 found that the presence of an appropriate amount of water can accelerate the dissolution while the methanol is just the opposite. Their results showed that methanol can promote the dissolution of starch in the 8:2:3 (wt./wt./wt.)…”

“…mixture of [Mmim][(MeO)HPO2]/water/methanol as methanol can penetrate into the starch granules and swell the outer layer of the granules. 94 They demonstrated that this ternary mixture is as good as the 7:3 (wt./wt.) [Mmim][(MeO)HPO2]/water mixture to dissolve maize starch at a lower temperature.…”