Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (3): 479-489.DOI: 10.3969/j.issn.1004-1524.2021.03.13

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Antibacterial activities and optimization of fermentation conditions of lipopeptides produced by Aureobasidium pullulans PA-2

YUE Denggao, CHENG Liang*(), GUO Qingyun   

  1. Academy of Agriculture and Forestry Science of Qinghai University, Key Laboratory of Agricultural Integrated Pest Management of Qinghai Province, Scientific Observing and Experimental Station of Crop Pest of Ministry of Agriculture and Rural Affairs, Xining 810016, China
  • Received:2020-07-26 Online:2021-04-02 Published:2021-03-25
  • Contact: CHENG Liang

Abstract:

The antibacterial activities of lipopeptides from Aureobasidium pullulans PA-2 was explored, and the fermentation conditions were optimized with the output of lipopeptides as the response value, laying a theoretical foundation for the production and application of lipopeptides. The lipopeptides was crudely extracted by acid precipitation method. The crude extract of lipopeptide was qualitatively detected by in-situ acid hydrolysis and ninhydrin colorimetry. Antibacterial activities were measured by the method of agar drilling diffusion. The fermentation conditions were optimized by central composite design (CCD). Finally, the crude extract was identified as cyclic lipopeptide. The lipopeptides had obvious effects on Staphylococcus aureus, Saccharomyces cerevisiae, Escherichia coli, Mycosphaerella cerasella, Pyrenophorateres drechsler and antibacterial circle were 3.65, 1.95, 2.15, 1.35 and 2.18 cm respectively. The optimal fermentation conditions were: inoculation amount 6.8%, rotation speed 216 r·min -1, culture temperature 26 ℃, liquid volume 125 mL and initial pH 7.Under this condition, predicting yield of antibacterial lipopeptides by the model was 0.94 g·L -1, actually 0.92 g·L -1, which was 51% more than that of before(0.61 g·L -1). The optimized fermentation conditions increase the yield of the lipopeptide and reduce the fermentation cost, which may be applied to the control of strains with inhibitory effect above

Key words: Aureobasidium pullulans PA-2, lipopeptides, antibacterial activity, optimization of fermentation

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