Preparation of water‐soluble starch oligomers from variable starch species in 1‐allyl‐3‐methylimidazolium chloride

Abstract

Native wheat, barley, rice, maize, wx maize, and potato starch species were modified by depolymerization in 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) ionic liquid (IL) using oil bath or microwave heating. Reactions were catalyzed with p-toluenesulfonic acid (p-TsOH). Reaction times varied depending on the starch species and its concentration, the heating method, and volume of the reaction mixture. Depolymerization products were analyzed with HPLC-ELSD. All starch species mostly degraded into water-soluble 1500-2000 Da-sized starch oligomers. Glucose and other short-chained sugars did not precipitate along with starch oligomers due to their high solubility in IL. This property was utilized in the purification of commercial maltodextrins. Produced water-soluble, low MW starch oligomers might be used, e.g., in bacterial cultivations as a glucose source.

Binding of some heavy metal ions in aqueous solution with cationized or sulphonylated starch or waste starch

“…1‐Allyl‐3‐methylimidazolium chloride was prepared by using the known methods , dried before use overnight in high vacuum (60°C) and stored in a desiccator. Allyl chloride (Reagent Plus®, 99%, product code 236306) and 1‐methylimidazole (≥99%, 336092) were purchased from Sigma–Aldrich.…”

“…In our previous research, we developed a method to produce water‐soluble starch oligomers, e.g . from native barley starch in various ionic liquids . In this study, we first functionalized the barley starch oligomers further by cationization in an ionic liquid media.…”

Morphology and phase transition of waxy cornstarch in solvents of 1-allyl-3-methylimidazolium chloride/water

“…Recently, IL 1-allyl-3-methylimidazolium chloride (AMIMCl) (see Fig. 1), which is a good solvent for cellulose, has also been applied for starch modification and processing [8,9]. This IL has low vapor pressure, high thermal stability and relatively low viscosity at room temperature, enabling it to be processed with starch over a wide range of work conditions.…”

Thermal-sensitive Starch-g-PNIPAM prepared by Cu(0) catalyzed SET-LRP at molecular level

“…In 2000, Zhuo and co-workers prepared temperature-sensitive hydrogels with improved surface property by polymerization of NIPAM with gelated corn starch. Recently, ionic liquid, employed as an environmentally benign green solvent, instead of classical organic ones, [5][6][7][8][9][10][11] has attracted increasingly attentions in the eld of dissolution and modication of natural polymers, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] which makes the gra polymerization at molecular level and the improvement of gra ratio possible. 2 In 2010, poly(NIPAM-co-DMAAm) graed starch microspheres were prepared by Fundueanu and coworkers as well.…”