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International Journal of Medicinal Mushrooms
Impact-faktor: 1.423 5-jähriger Impact-Faktor: 1.525 SJR: 0.433 SNIP: 0.661 CiteScore™: 1.38

ISSN Druckformat: 1521-9437
ISSN Online: 1940-4344

Volumes:
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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.v19.i5.40
pages 419-431

Efficient Accumulation and In Vitro Antitumor Activities of Triterpene Acids from Submerged Batch−Cultured Lingzhi or Reishi Medicinal Mushroom, Ganoderma lucidum (Agaricomycetes)

Xiao-Ling Wang
Hunan Provincial Key Laboratory for Forestry Biotechnology, College of Life Science and Technology, Central South University of Forestry & Technology, Changsha, P.R. China
Zhong-Yang Ding
National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, PR. China
Yan Zhao
Hunan Provincial Key Laboratory for Forestry Biotechnology, College of Life Science and Technology, Central South University of Forestry & Technology, Changsha, P.R. China
Gao-Qiang Liu
Hunan Provincial Key Laboratory for Forestry Biotechnology, College of Life Science and Technology, Central South University of Forestry & Technology, Changsha, P.R. China; Hunan Provincial Key Laboratory for Control of Forest Diseases and Pests, Central South University of Forestry & Technology, Changsha, PR. China
Guo-Ying Zhou
Hunan Provincial Key Laboratory for Forestry Biotechnology, College of Life Science and Technology, Central South University of Forestry & Technology, Changsha, P.R. China; Hunan Provincial Key Laboratory for Control of Forest Diseases and Pests, Central South University of Forestry & Technology, Changsha, PR. China

ABSTRAKT

Triterpene acids are among the major bioactive constituents of lucidum. However, submerged fermentation techniques for isolating triterpene acids from G. lucidum have not been optimized for commercial use, and the antitumor activity of the mycelial triterpene acids needs to be further proven. The aim of this work was to optimize the conditions for G. lucidum culture with respect to triterpene acid production, scaling up the process, and examining the in vitro antitumor activity of mycelial triterpene acids. The key conditions (i.e., initial pH, fermentation temperature, and rotation speed) were optimized using response surface methodology, and the in vitro antitumor activity was evaluated using the MTT method. The optimum key fermentation conditions for triterpene acid production were pH 6.0; rotation speed, 161.9 rpm; and temperature, 30.1°C, resulting in a triterpene acid yield of 291.0 mg/L in the validation experiment in a 5-L stirred bioreactor; this yield represented a 70.8% increase in titer compared with the nonoptimized conditions. Furthermore, the optimized conditions were then successfully scaled up to a production scale of 200 L, and a triterpene productivity of 47.9 mg/L/day was achieved, which is, to our knowledge, the highest reported in the large-scale fermentation of G. lucidum. In addition, the mycelial triterpene acids were found to be cytotoxic to the SMMC-7721 and SW620 cell lines in vitro. Chemical analysis showed that the key active triterpene acid compounds, ganoderic acids T and Me, predominated in the extract, at 69.2 and 41.6 mg/g, respectively. Thus, this work develops a simple and feasible batch fermentation technique for the large-scale production of antitumor triterpene acids from G. lucidum.


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