Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (6): 1245-1255.DOI: 10.3969/j.issn.1004-1524.20230204

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Optimization and antioxidant activity of liquid medium of extracellular polysaccharides from Sanghuangporus sanghuang JM-1

CAO Naixin1,2(), LUO Yanglan1,*(), YAN Yong1, XIE Xiuchao2, ZHANG Wenlong1   

  1. 1. Microbiology Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
    2. School of Biological Science and Technology, Shaanxi University of Technology, Hanzhong 723000, Shaanxi, China
  • Received:2023-02-22 Online:2024-06-25 Published:2024-07-02

Abstract:

In order to optimize the liquid fermentation medium formula of Sanghuangporus sanghuang JM-1 extracellular polysaccharide and explore its antioxidant activity in vitro, JM-1 was purified and identified by tissue separation method. The liquid medium condition of extracellular polysaccharides from S.sanghuang JM-1 fermentation was optimized by Box-Behnken response surface methods. And the antioxidant activity of the produced extracellular polysaccharides was determined in vitro. The results showed that the optimized liquid medium formula was cornmeal 5.4 g·L-1, glucose 17.0 g·L-1, peptone 5.8 g·L-1, vitamin B1 (VB1) 10.0 mg·L-1, KH2PO4 3.0 g·L-1, MgSO4·7H2O 5.0 g·L-1. Under the experimental conditions, the content of extracellular polysaccharide was 5.918 g·L-1, which was increased by 13.63% than the basal medium. The extracellular polysaccharide produced by JM-1 had the reducing capacity and the scavenging ability of DPPH free radical and hydroxyl radical. At the mass concentration of 5 mg·mL-1, the reduction ability was 3.187 mmol·L-1, and the scavenging rate were 63.9% and 54.3% for DPPH free radical and hydroxyl radical, respectively. This study provided scientific reference for the development and utilization of Sanghuangporus sp. resources.

Key words: Sanghuangporus sp., extracellular polysaccharides, Plackett-Burman design, Box-Behnken response surface method, antioxidant activities

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