Free radical scavenging and apoptotic effects of Cordyceps sinensis fractionated by supercritical carbon dioxide

Be Jen Wang*, Shen Jeu Won, Zer Ran Yu, Chun Li Su

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

111 引文 斯高帕斯(Scopus)

摘要

Supercritical carbon dioxide (SC-CO2) was used as the elution solvent for fractioning ethanolic extract (E) of Cordyceps sinensis (CS), a traditional Chinese herbal remedy, into R, F1, F2, and F3 fractions. This extractive fractionation method is amenable to large scale and is nontoxic. These four fractions were characterized in terms of total polysaccharides and cordycepin concentrations, scavenging ability of free radicals, and anti-tumor activities. Experimental results demonstrated that fractionation altered the distributions of total polysaccharides and cordycepin in fractions. Fraction R was the most active fraction to scavenge free radicals and inhibit the proliferation of carcinoma cells, followed by the fraction F1 and the extract E. The effect of scavenging on 1,1-diphenyl-2-picryl hydrazyl (DPPH) of CS extract and fractions at 2 mg/ml was R (93%), F1 (75%), E (66%), F2 (47%), and F3 (27%). The IC50 (50% cell growth inhibitory concentration) of tumor cell proliferation and colony formation on human colorectal (HT-29 and HCT 116) and hepatocellular (Hep 3B and Hep G2) carcinoma cells by fraction R were around 2 μg/ml. Conversely, R did not affect the growth of normal dividing human peripheral blood mononuclear cells (PBMC) by exhibiting a large value of IC 50 over 200 μg/ml. Accumulation of tumor cells at sub-G 1 phase and the fragmentation of DNA, typical features of programmed cell death, were observed in a time and dose dependent manner. Scavenging of free radicals and anti-cancer activity (value of IC50) correlated closely with the quantities of polysaccharides (Spearman's rho = 0.901 and -0.870, respectively). Taken together, our findings suggest that fraction R, obtained by SC-CO2 fluid extractive fractionation, showed strong scavenging ability and selectively inhibited the growth of colorectal and hepatocellular cancer cells by the process of apoptosis.

原文英語
頁(從 - 到)543-552
頁數10
期刊Food and Chemical Toxicology
43
發行號4
DOIs
出版狀態已發佈 - 2005 四月

ASJC Scopus subject areas

  • 食品科學
  • 毒理學

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