Abstract：
Ethanol is a common solvent to isolate glucomannan from porang (Amorphophallus muelleri Blume) flour (NPF). This study investigated the use of natural deep eutectic solvents (NADESs) in glucomannan isolation from NPF. NADESs formed by the hydrogen bond acceptors (choline chloride and betaine) and the hydrogen bond donors (glycerol, 1,2-propanediol, formic acid, and acetic acid) in varying molar ratios of 1:2, 1:3, and 1:4 were characterized to optimize glucomannan isolation. The results showed that higher molar ratios of NADES tended to yield porang glucomannan flour (PGF) with higher glucomannan content and viscosity. The gel of PGF exhibited pseudoplastic behavior. The FTIR spectra indicated that betaine-based NADES removed the acetyl groups from glucomannan chains. The PGF obtained from NADESs with a molar ratio of 1:4 was comparable to those obtained from ethanol with a glucomannan content of 87.34 %-93.28 % and a weight-average molecular weight of 9.12 × 105-1.20 × 106 g/mol.
摘要：
乙醇是从porang（AmorphophallusmuelleriBlume）面粉（NPF）中分离葡甘露聚糖的常用溶剂。这项研究调查了天然深共晶溶剂（NADESs）在从NPF中分离葡甘露聚糖中的用途。由氢键受体（氯化胆碱和甜菜碱）和氢键供体（甘油，1,2-丙二醇,甲酸,和乙酸）以1：2、1：3和1：4的不同摩尔比进行表征，以优化葡甘露聚糖的分离。结果表明，较高的NADES摩尔比倾向于生产具有较高葡甘露聚糖含量和粘度的葡糖葡甘露聚糖粉（PGF）。PGF的凝胶表现出假塑性行为。FTIR光谱表明，基于甜菜碱的NADES从葡甘露聚糖链中除去了乙酰基。从摩尔比为1：4的NADESs获得的PGF与从葡甘露聚糖含量为87.34％-93.28％，重均分子量为9.12×105-1.20×106g/mol的乙醇获得的PGF相当。
