Characterization of glucomannan from some Amorphophallus species in Vietnam

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• 作者：Nguyen Tien An ; Do Truong Thien ; Nguyen Thi Dong ; Pham Le Dung ; Nguyen Van Du
• 关键词：Amorphophallus paeoniifolius ; Konjac glucomannan ; Konjac flour
• 刊名：Carbohydrate Polymers
• 出版年：2010
• 出版时间：25 March 2010
• 年：2010
• 卷：80
• 期：1
• 页码：308-311
• 全文大小：378 K

文摘

In this work, konjac glucomannans (KGM) have been isolated from Amorphophallus tubers (used three Amorphophallus species: Amorphophallus panomensis, Amorphophallus paeoniifolius and Amorphophallus tonkinensis) by a simple method without using toxic chemicals. The konjac glucomannan content was about 5–9 % (w/w) of original Amorphophallus tubers. The structure, moisture uptake, molecular weight of konjac glucomannan were investigated by nuclear magnetic resonance spectroscopy (NMR), differential scanning calorimetry (DSC) and viscosimetry. The results indicated that the main component of konjac flour was glucomannan. The mannose/glucose molar ratio and molecular weight (M_w) of glucomannan isolated from Amorphophallus paeoniifolius, Amorphophallus panomensis and Amorphophallus tonkinensis were 1/0.13; (M_w = 1.115 × 10⁶), 1/0.10; (M_w = 1.023 × 10⁶) and 1/0.25; (M_w = 1.043 × 10⁶), respectively. The moisture uptake of konjac glucomannans was about 7.5–9.2 % .