NMR and rheological study of Aloe barbadensis partially acetylated glucomannan

被引：86

作者：

Campestrini, L. H. ^{[1
]}

Silveira, J. L. M. ^{[1
]}

Duarte, M. E. R. ^{[1
]}

Koop, H. S. ^{[1
]}

Noseda, M. D. ^{[1
]}

机构：

[1] Univ Fed Parana, Dept Bioquim & Biol Mol, BR-81531980 Curitiba, Parana, Brazil

来源：

CARBOHYDRATE POLYMERS | 2013年 / 94卷 / 01期

关键词：

Aloe barbadensis; Partially acetylated glucomannan; Chemical structure; Rheology behavior; Aloe polysaccharide; Aloe pulp; BIOACTIVE POLYSACCHARIDE ACEMANNAN; CELL-WALL POLYMERS; GELATION; GALACTOGLUCOMANNAN; MILLER; LEAVES; GEL; DEACETYLATION; ASSIGNMENT; ACID;

D O I：

10.1016/j.carbpol.2013.01.020

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The structural and rheological properties of the Aloe extract (AE) and the polysaccharidic fraction (PF) obtained from the leaves pulp of Aloe barbadensis Miller were investigated. Structural analyses carried out by composition, methylation analysis and NMR spectroscopy showed that PF is mainly constituted by a partially acetylated 4-linked beta-D-glucomannan. The acetyl groups are located at C-2, C-2 and C-3, C-3 and/or C-6. The acetylation pattern of this type of polysaccharide was for the first time established using bidimensional NMR analyses. AE and PF aqueous solutions at 25 degrees C showed a non-Newtonian behavior (with pseudoplastic characteristics), however PF showed higher apparent viscosity than AE. Dynamic oscillatory analyses showed that both samples, at the same concentration, behaved as a concentrated solution. PF presented higher values of G' compared with those of AE and this behavior could be consequence of its higher content in partially acetylated glucomannan. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：511 / 519

页数：9

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