期刊
FOOD HYDROCOLLOIDS
卷 40, 期 -, 页码 9-15出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2014.02.001
关键词
Konjac glucomannan; Heterogeneous deacetylation; Characterization; Solubility uevaluation
资金
- National Natural Science Foundation of China [31371841]
Deacetylated konjac glucomannan (Da-KGM) powder was prepared in heterogeneous system. Kinetics of heterogeneous deacetylation was investigated to predict the optimum reaction conditions. The results indicated that: heterogeneous deacetylation was influenced by the kind and amount of alkali, ethanol concentration, temperature and reaction time. Meanwhile, it followed first-order kinetics and the apparent activation energy was 15.59 kJ/mol. The properties of Da-KGM were studied by Fourier-transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and X-ray diffraction (XRD), which proved that there was no significant difference of primary structure, thermal properties and crystal properties among Da-KGMs. The solubility was also analyzed and evaluated. As deacetylation degree (DD) increased, the solubility of KGM showed exponential decrease. In addition, lower temperature was more effective to promote the dissolution of Da-KGM. (C) 2014 Elsevier Ltd. All rights reserved.
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