Optimum Carbon and Nitrogen Sources for Enhancing Bioactive Compound Production of Isaria tenuipes

Authors

  • Yada Woraphokanunt Faculty of Science, King Mongkut's Institute of Technology Ladkrabang.
  • Marisa Jatupornpipat
  • Aree Rittiboon

Abstract

The objective of this study was to find out the optimal carbon and nitrogen sources for enhancing bioactive compound production of Isaria tenuipes, Snow-flake Dongchunghacho. Isaria tenuipes was cultivated on five different carbon sources - Riceberry rice, Sungyod rice, Hom Nil rice, Mun-pu rice, and Luem Pua glutinous rice. The significantly highest dry weight (p≤0.5) of Isaria tenuipes itself was from Riceberry rice carbon source, at 2.16 ± 0.11 g/100 g of substrate. The highest yields of bioactive compounds were the following: cordycepin (1.03 ± 0.04 mg/g), adenosine (7.5 ± 0.04 mg/g) and polysaccharides (0.23 ± 0.01 mg/g) obtained from Luem Pua Glutinous rice carbon source. Riceberry rice carbon source also provided the highest yield of adenosine. In another experiment, six nitrogen sources were assessed—yeast extract, peptone, egg, ground soybean, tryptone, and yeast extract combined with peptone. The highest yields of I. tenuipes and the bioactive compounds were the following: dry weight of the fruiting body (1.81 ± 0.03 g/100 g of substrate), yield of cordycepin (1.39 ± 0.10 mg/g), yield of adenosine (14.86 ± 1.52 mg/g) and yield of polysaccharides (0.24 ± 0.003 mg/g), all of which were obtained from egg nitrogen source. These findings may directly benefit to small farms and industrial scales of I. tenuipes cultivations in their effort to harvest the highest amount of its bioactive compounds.

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Published

2021-09-07