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Extraction and structural identification of alkali-soluble polysaccharides of longan (Dimocarpus longan Lour.) fruit pericarp

文献类型： 外文期刊

作者： Jiang, Guoxiang 1 ; Prasad, K. Nagendra 1 ; Jiang, Yueming 1 ; Yang, Bao 1 ; Jia, Yongxia 1 ; Sun, Jian 2 ;

作者机构： 1.Chinese Acad Sci, S China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China

2.Guangxi Acad Agr Sci, Inst Hort Res, Nanning 530007, Peoples R China

关键词： GC/MS;Infrared spectrum;Longan;Alkali-soluble polysaccharide

期刊名称：INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES （ 影响因子：5.916； 五年影响因子：6.159 ）

ISSN： 1466-8564

年卷期： 2009 年 10 卷 4 期

页码：

收录情况： SCI

摘要： Two alkali-soluble polysaccharide fractions (ASPS I and II) were extracted from longan fruit pericarp in this work. The results of chemical composition indicated that ASP I and II fractions comprised mainly of polysaccharides. proteins and lignins. Four monosaccharides, namely Xyl. Ara, Glc and Gal, were identified for both ASPS I and II. Xyl was the dominant monosaccharide in the two alkali-soluble polysaccharides with relative molar percentages of > 60%. It constructed the backbone in combination with Ara for both ASPS I and II. The analysis of glycosidic linkage indicated that Xyl had two linkages, -> 3)-Xyl-(1 -> and -> 3, 4)-Xyl-(1 ->. The substitution at C-4 position indicated that Xyl was of pyranose structure. The infrared spectra of ASPS I and II showed the characteristic bands at approximate 897 cm(-1) which indicated the beta-linkage configuration of Xyl. Industrial relevance: Hemicellulose has been suggested as an important polysaccharide with good pharmaceutical properties, including immune modulation and anti-cardiovascular diseases. In this work, alkali-soluble polysaccharides were extracted from longan fruit pericarp and fractionated. The structural characteristics were identified by gas chromatography/mass spectrometry and infrared spectrophotometry. The results will be helpful for application of hemicellulose in functional food industry. (C) 2009 Elsevier Ltd. All rights reserved.

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