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Frontiers in microbiology
2022;13 1015913.

Pigment production by a newly isolated strain SYBC-L7 in solid-state fermentation.

Di Meng, Xuan Shao, Shou-Peng Luo, Qiao-Peng Tian, Xiang-Ru Liao
Author Information
  1. Di Meng: Henan Provincial Engineering Research Center for Development and Application of Characteristic Microorganism Resources, Shangqiu Normal University, Shangqiu, China.
  2. Xuan Shao: Henan Provincial Engineering Research Center for Development and Application of Characteristic Microorganism Resources, Shangqiu Normal University, Shangqiu, China.
  3. Shou-Peng Luo: Hua Tian Engineering & Technology Corporation, MCC, Nanjing, China.
  4. Qiao-Peng Tian: Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.
  5. Xiang-Ru Liao: Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.
PMID: 36338084 DOI: 10.3389/fmicb.2022.1015913

Abstract

Natural pigments are playing important roles in our daily lives. They not only make products colorful but also provide various health benefits for humans. In addition, genus, listed as food- and cosmetic-grade microorganism, is one of the promising organisms for developing natural pigments. In this study, a new fungal strain with high efficiency in producing intense orange pigments was isolated and identified as SYBC-L7. Different agro-industrial wastes were applied to evaluate the growth and pigment production of strain SYBC-L7. SYBC-L7 can grow rapidly and effectively produce pigments using wood chips as substrate in solid-state fermentation (SSF). Culture conditions were also optimized for value-added pigments production and the optimum production conditions were glucose as carbon source, ammonium tartrate as nitrogen source, initial pH 6.0, and relative humidity of 65%. Pigment components, cinnabarinic acid, tramesanguin, and 2-amino-9-formylphenoxazone-1-carbonic acid were confirmed by liquid chromatography-mass spectrometry. Meanwhile, an agar plate diffusion assay was performed to evaluate the antimicrobial activity of the pigment. These pigments showed more significant inhibition of Gram-positive than Gram-negative bacteria. The results showed that SYBC-L7 was able to cost-effectively produce intense natural orange pigments with antibacterial activity in SSF, which is the basis of their large-scale production and application.

Keywords

Pycnoporus sanguineus agro-industrial wastes cinnabarinic acid food- and cosmetic-grade microorganism natural pigment

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