Cellulose nanocrystals coated with a tannic acid-Fe 3+ complex as a significant medium for efficient CH 4 microbial biotransformation

• Published in: Carbohydrate polymers 2021-04, Vol.258, p.117733
• Main Authors: Kang, Eungsu, Je, Hwa Heon, Moon, Eunjoo, Na, Jeong-Geol, Kim, Min Sik, Hwang, Dong Soo, Choi, Yoo Seong
• Format: Article
• Language: English
• ISSN: 1879-1344

Microbial biotransformation of CH gas has been attractive for the production of energy and high-value chemicals. However, insufficient supply of CH in a culture medium needs to be overcome for the efficient utilization of CH . Here, we utilized cellulose nanocrystals coated with a tannic acid-Fe complex (TA-Fe CNCs) as a medium component to enhance the gas-liquid mass-transfer performance. TA-Fe CNCs were well suspended in water without agglomeration, stabilized gas bubbles without coalescence, and increased the gas solubility by 20 % and the k a value at a rapid inlet gas flow rate. Remarkably, the cell growth rate of Methylomonas sp. DH-1 as model CH -utilizing bacteria improved with TA-Fe CNC concentration without any cytotoxic or antibacterial properties, resulting in higher metabolite production ability such as methanol, pyruvate, formate, and succinate. These results showed that TA-Fe CNCs could be utilized as a significant component in the culture medium applicable as a promising nanofluid for efficient CH microbial biotransformation.