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Chemical compositions and bioactivities of crude polysaccharides from tea leaves beyond their useful date

Authors
Journal
International Journal of Biological Macromolecules
0141-8130
Publisher
Elsevier
Publication Date
Volume
49
Issue
5
Identifiers
DOI: 10.1016/j.ijbiomac.2011.09.013
Keywords
  • Camellia Sinensis
  • Tea Leaves Beyond Their Useful Date
  • Crude Polysaccharides
  • Antioxidant Activity
  • Free Radical Scavenging Activity
Disciplines
  • Biology
  • Chemistry

Abstract

Abstract The chemical compositions and bioactivities of crude tea polysaccharides (TPS) from the out-of-date tea leaves (beyond their useful date), namely Xihu Longjing (XTPS), Anxi Tieguanyin (TTPS), Chawentianxia (CTPS) and Huizhoulvcha (HTPS), in market were investigated. These TPS showed similar neutral sugar content and different distribution of molecular weight (1–800kD). These crude TPS were mainly composed of rhamnose, arabinose, galactose, glucose, xylose, mannose, and galacturonic acid. IR spectra confirmed that these crude TPS were composed of polysaccharide, protein and uronic acids. These TPS showed similar DPPH scavenging activity and exhibited lower DPPH scavenging activities than Vc within 25–200μg/mL. However, these TPS with higher concentrations (200–400μg/mL) showed similar DPPH scavenging activity with Vc. HTPS exhibited significant higher superoxide anion scavenging activity than others TPS and gallic acid. XTPS showed significant higher inhibitory effects on α-glucosidase and α-amylase with inhibitory percentages of 64.35% and 82.24% than others TPS. TTPS, XTPS, and HTPS exhibited similar inhibition ability on α-d-glucosidase and α-amylase. The overdue tea leaves can be a resource of tea polysaccharides as function food.

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