Biodegradation of Dananhu low-rank coal by Planomicrobium huatugouensis: Target metabolites possessing degradation abilities and their biodegradation pathways

Jie Yang, Xiangrong Liu, Zaiwen Yang and Shunsheng Zhao

Energy, 2023, vol. 276, issue C

Abstract: Biodegradation of coal by microorganism is a green way to convert coal into fine chemicals with high added values. The metabolites of microorganism are the main substances of coal degradation, which determine the biodegradation rate and pathway of coal. In this work, the metabolomics approach was used to identify the metabolites of P. huatugouensis after addition of Dananhu low-rank coal. The results indicated that 43 upregulated and 38 downregulated metabolites (VIP >1, p < 0.05) were identified compared to the metabolites of P. huatugouensis alone. 6 target metabolites secreted by P. huatugouensis, which were alkaline substances (Ammonia, Tyramine, N-acetylcadaverine, L-carnitine, Betaine) and chelator (Citrate), were found to have biodegradation activities on Dananhu low-rank coal. Hence, there were alkali pathway and chelator pathway in the degradation process of Dananhu low-rank coal. Analysis of the coal degradation products by UV–Vis and GC-MS suggested that the above 6 target metabolites could act on the ester, ether, and metal linkages of Dananhu low-rank coal to depolymerize macromolecular structure into liquid organic molecules such as alcohols, aldehydes and ketones (81.82%). This study determined the target metabolites of microorganism and their biodegradation pathways of coal by means of metabolomics, which provided a basis for promoting efficient biodegradation of coal through regulation of targeted metabolites in the future.

Keywords: Planomicrobium huatugouensis; Dananhu low-rank coal; Biodegradation pathways; Target metabolites; Metabolomics (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:276:y:2023:i:c:s0360544223010368

DOI: 10.1016/j.energy.2023.127642

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