Abstract
The structural disorganization of different starches in a 1-ethyl-3-methylimidazolium acetate ([Emim][OAc])/water mixture (1:6 mol./mol.) at room temperature (25 °C) was studied. For normal cereal starches, which have pinholes randomly dispersed on the granule surface or only in the outermost annular region (wheat starch), the aqueous ionic liquid (IL) completely destroyed the granule structure within 1–1.5 h. Pea starch (PeS) granules with cracks were destroyed by the aqueous IL within 6 h. High-amylose maize starch (HAMS), as well as potato and purple yam starches (PoS and PYS), which have a dense and thick outer granule layer, were even more resistant to the action of the solvent. Structural disorganization was accompanied by increased viscosity and controlled the binding of water molecules with starch chains. From this study, we concluded that the surface characteristics of starch granule are an important factor affecting starch structural disorganization in an aqueous IL.
Highlights
There has been huge interest in developing biodegradable polymeric materials based on natural biopolymers due to the desire for achieving sustainability and taking advantage of the unique properties of these natural biopolymers (Seoud, Koschella, Fidale, Dorn, & Heinze, 2007)
Organophosphates were detected in all starches, with the greatest amount observed for potato starch mainly due to the presence of phosphate groups (Blennowa, Nielsen, Baunsgaard, Mikkelsen, & BEngelsen, 2002)
The results indicated that the mobility of water molecules in these starch suspensions was changed to a much smaller degree compared with other starch suspensions, consistent with the starch structural changes caused by the aqueous ionic liquid (IL)
Summary
There has been huge interest in developing biodegradable polymeric materials based on natural biopolymers due to the desire for achieving sustainability and taking advantage of the unique properties of these natural biopolymers (Seoud, Koschella, Fidale, Dorn, & Heinze, 2007). Na 3.2 Crystalline structures of starch samples treated with aqueous [Emim][OAc] ur Native MiS, WMS, NMS, and WS exhibited a typical A-type diffraction pattern with reflections at Jo 15°, 17°, 18°, and 23° (2θ) (Fig. 1A).
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