Abstract
Methanol, the simplest aliphatic molecule of the alcohol family, finds diverse range of applications as an industrial solvent, a precursor for producing other chemicals (e.g., dimethyl ether, acetic acid and formaldehyde), and a potential fuel. There are conventional chemical routes for methanol production such as, steam reforming of natural gas to form syngas, followed by catalytic conversion into methanol; direct catalytic oxidation of methane, or hydrogenation of carbon dioxide. However, these chemical routes are limited by the requirement for expensive catalysts and extreme process conditions, and plausible environmental implications. Alternatively, methanotrophic microorganisms are being explored as biological alternative for methanol production, under milder process conditions, bypassing the requirement for chemical catalysts, and without imposing any adverse environmental impact. Methanotrophs possess inherent metabolic pathways for methanol production via biological methane oxidation or carbon dioxide reduction, thus offering a surplus advantage pertaining to the sequestration of two major greenhouse gases. This review sheds light on the recent advances in methanotrophic methanol production including metabolic pathways, feedstocks, metabolic engineering, and bioprocess engineering approaches. Furthermore, various reactor configurations are discussed in view of the challenges associated with solubility and mass transfer limitations in methanotrophic gas fermentation systems.
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(Adapted from Sahoo et al. 2021). MMO: methane monooxygenase; MDH: methanol dehydrogenase; FaDH: formaldehyde dehydrogenase; FDH: formate dehydrogenase; PQQ: pyrroloquinoline quinone; PQQH2: pyrroloquinoline quinol; NADH: nicotinamide adenine dinucleotide hydrogen; RuMP: ribulose monophosphate; CBB: Calvin-Benson-Bassham
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Krishna Kalyani Sahoo is thankful to Ministry of Education, Government of India for her research fellowship.
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Sahoo, K.K., Katari, J.K. & Das, D. Recent advances in methanol production from methanotrophs. World J Microbiol Biotechnol 39, 360 (2023). https://doi.org/10.1007/s11274-023-03813-y
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DOI: https://doi.org/10.1007/s11274-023-03813-y