Journal
FOOD CHEMISTRY
Volume 119, Issue 4, Pages 1626-1632Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2009.09.055
Keywords
Cyclocarya paliurus (Batal.) Iljinskaja; Polysaccharide; Purification; Monosaccharide composition; Antioxidant activity
Funding
- Changjiang Scholars and Innovative Research Team in University [IRT0540]
- Natural Science Foundation of Jiangxi Province [9920029]
- Nanchang University Testing Fund [2005002]
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A water-soluble polysaccharide was isolated from the water extract of Cyclocarya paliurus (Batal.) Iljinskaja, which is a well-known native health tea in China. This polysaccharide was named as CPP-1. The molecular weight of CPP-1 was determined by high-performance gel permeation chromatography, with an average molecular weight of about 1167 kDa. The analysis of monosaccharide composition in the polysaccharide by gas chromatography revealed that it was a heteropolysaccharide and consisted of D-xylose, L-arabinose, D-glucose, D-galactose, L-rhamnose and D-mannose in a molar ratio of 1.00:9.67:9.65:4.96:3.29:2.70. Furthermore, CPP-1 contains 8.44% of protein and 17 general amino acids, and it is rich in glutamic acid, asparagic acid, leucine, glycine, arginine, tyrosine and alanine. The antioxidant activity of CPP-1 was also evaluated. It was found that CPP-1 exerted significant scavenging effects on DPPH radicals with a value of around 91.4%, compared to the reference controls of BHT (91.2%) and ascorbic acid (98.9%) at a concentration of 400 mu g/ml, and with EC50 values of 52.3 mu g/ml. (C) 2009 Elsevier Ltd. All rights reserved.
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