Statistical optimization of culture medium for production of exopolysaccharide from endophytic fungus Bionectria ochroleuca and its antitumor effect in vitro

Authors

  • Yun Li School of Life Sciences and Food Technology, Hanshan Normal University, Chaozhou, Guangdong 521041, China
  • Shoujun Guo School of Life Sciences and Food Technology, Hanshan Normal University, Chaozhou, Guangdong 521041, China
  • Hui Zhu School of Life Sciences and Food Technology, Hanshan Normal University, Chaozhou, Guangdong 521041, China

DOI:

https://doi.org/10.17179/excli2016-154

Keywords:

endophytic fungi, Bionectria ochroleuca, exopolysaccharide, antitumor activity

Abstract

Endophytic fungi have been recognized as possible useful sources of bioactive metabolites. However, exopolysaccharide (EPS) production from endophytic fungi and its antitumor activity have been less explored. In the present study, endophtic fungus Bionectria ochroleuca M21 was exploited for the production of EPS in submerged culture. Among tested medium components, glucose, yeast extract, MgSO4 and Tween80 were found to be effective and significant on EPS production. Response surface methodology (RSM) was employed to optimize medium composition. The results showed that the significant factors were glucose, yeast extract and Tween80. The optimal medium was observed at the composition of glucose 55.7 g/L, yeast extract 6.04 g/L, MgSO4 0.25g/L and Tween80 0.1 % (v/v). Using the optimized medium, EPS production was achieve at 2.65 ± 0.16 g/L after 4 days fermentation in a 5L bioreactor. Examination of cytotoxicity showed that the EPS from B. ochroleuca M21 did not have cytotoxic activity on human liver HL-7702 cells at concentration 0.025-1.6 mg/mL. In contrast, the EPS exhibited antiproliferative activities against cell lines of liver cancer (HepG2), gastric cancer (SGC-7901) and colon cancer (HT29) in a dose- and time-dependent manner in the concentration ranges of 0.1-0.45 mg/mL.

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Published

2016-03-11

How to Cite

Li, Y., Guo, S., & Zhu, H. (2016). Statistical optimization of culture medium for production of exopolysaccharide from endophytic fungus Bionectria ochroleuca and its antitumor effect in vitro. EXCLI Journal, 15, 211–220. https://doi.org/10.17179/excli2016-154

Issue

Vol. 15 (2016)

Section

Original articles

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