Journal
CARBOHYDRATE POLYMERS
Volume 152, Issue -, Pages 70-78Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.06.090
Keywords
Artemisia sphaerocephala; Selenized polysaccharide; Solution conformation; Anti-tumor activity
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Funding
- National Science Foundation of China [51463022]
- Natural Science Foundation of Gansu Province, China [1308RJZA200]
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It has been reported in our previous work that selenized Artemisia sphaerocephala polysaccharides (SeASPs) with the Se content range of 168-1703 mu g/g were synthesized by using Na2SeO3/HNO3/BaCl2 system. In the present work, the solution property of SeASP was studied by using size exclusion chromatography combined with multi angle laser light scattering (SEC-MALLS). A decrease in df values indicated that SeASPs with different conformational features that were highly dependent on Mw. SeASPs exhibited a more rigid conformation (df value of 1.29-1.52) in low molecular weight range (Mw of 1.026-1.426 x 10(4) g/mol) and compact spherical conformation in high molecular weight range (Mw of 2.268-4.363 x 10(4) g/mol). It could be due to the degradation of polysaccharide chains in HNO3, which was supported in monosaccharide composition analysis. Congo red (CR) spectrophotometric method and atomic force microscopy (AFM) results also confirmed the conformational transition and the evidence on the shape of the rigid chains. In vitro anti-tumor assays, SeASP2 displayed greater anti-proliferative effects against three tumor cell lines (hepatocellular carcinoma HepG-2 cells, lung adenocarcinom A549 cells and cervical squamous carcinoma Hela cells) in a dose-dependent manner. This suggested that selenylation could significantly enhance the anti-tumor activities of polysaccharide derivatives in vitro. (C) 2016 Elsevier Ltd. All rights reserved.
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