Structure identification of a polysaccharide purified from litchi (Litchi chinensis Sonn.) pulp

•The precise structure of a arabinogalactan was identified from litchi pulp.•The polysaccharide was comprised of Ara, Gal, Rha and GalA.•The NMR information of this arabinogalactan was revealed. As a health-beneficial fruit, litchi is widely accepted by people in subtropical and tropical regions. Ho...

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Bibliographic Details
Published in:Carbohydrate polymers 2016-02, Vol.137, p.570-575
Main Authors: Yang, Bao, Prasad, K. Nagendra, Jiang, Yueming
Format: Article
Language:English
Subjects:
Arabinogalactan
Carbohydrate Sequence
Litchi
Litchi - chemistry
Molecular Sequence Data
Monosaccharides - analysis
Plant Extracts - chemistry
Polysaccharide
Polysaccharides - chemistry
Structure
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Summary:•The precise structure of a arabinogalactan was identified from litchi pulp.•The polysaccharide was comprised of Ara, Gal, Rha and GalA.•The NMR information of this arabinogalactan was revealed. As a health-beneficial fruit, litchi is widely accepted by people in subtropical and tropical regions. However, the critical chemicals responsible for the health benefits are not clear yet. As a large amount of polysaccharides are present in litchi, they might play an important role in the health benefits. In this work, the main water-soluble polysaccharide (LPPBa) was purified from litchi pulp. The chemical structure was characterized as arabinogalactan by gas chromatography and nuclear magnetic resonance spectrometry (NMR). NMR data revealed the glycosidic linkages and their locations in backbone and branches. The precise structure was putatively identified as below, and it was different to those commonly occurred arabinogalactans. The molecular weight was determined to be 2.4×106Da by gel permeation chromatography. [Display omitted]
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2015.10.088