Conversion of biogas to methanol by methanotrophs immobilized on chemically modified chitosan

Bioresource Technology
Sanjay K S PatelJung-Kul Lee

Abstract

In this study, chitosan modified with glutaraldehyde (GLA), 3-aminopropyltriethoxysilane (APTES), polyethyleneimine, and APTES followed by GLA (APTES-GLA) as a support material was used to improve methanol production from biogas. Among these support materials, chitosan-APTES-GLA showed the highest increase in immobilization yield and relative efficiency of Methylomicrobium album up to 56.4% and 97.7%, respectively. Maximum cell loading of 236 mg dry cell mass per g-support was observed for M. album., which is 7.7-fold higher than that of chitosan. The immobilized M. album maintained a 23.9-fold higher methanol production compared to free cells after 8 cycles of reuse; it also produced 6.92 mmol·L-1 methanol from biogas that originated from anaerobic digestion of rice straw, thereby validating its industrial application. This is the first report on the immobilization of methanotrophs on chemically modified chitosans to improve cell loading and relative efficiency, and its potential applications in the conversion of greenhouse gases to methanol.

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Citations

Jul 24, 2021·Indian Journal of Microbiology·Priyanka BokadeAbhay Bajaj
Jul 30, 2021·Bioresource Technology·Mirko CucinaFabrizio Adani
Sep 1, 2021·Journal of Bioscience and Bioengineering·Pranav Pradip KulkarniAnand Rameshchandra Ghosalkar
Sep 21, 2021·Frontiers in Microbiology·Monali C RahalkarJyoti A Mohite
Oct 8, 2021·Frontiers in Microbiology·Immad AnsariMuhammad Sohail

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