Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 191, Issue -, Pages 211-221Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.09.077
Keywords
Bacterial cellulose; Komagataeibacter; Kitchen waste
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A cellulose-producing bacterium K15 isolated from kombucha tea shows strong cellulose production abilities with different carbon sources and survival mechanisms in nitrogen-free conditions. Cultivating K15 in a kitchen waste medium successfully produced cellulose with good crystallinity and chemical structure, providing a viable alternative strategy for cost-effective bacterial cellulose production using agroindustrial residues.
A cellulose-producing bacterium Komagataeibacter rhaeticus K15 was isolated from kombucha tea, and its metabolic pathways and cellulose synthesis operon were analyzed by genome sequencing. Different from the reported K. rhaeticus, the K15 produced little gluconic acid (2.26 g/L) when glucose was the sole carbon source and has the capacity for high cellulose production (4.76 g/L) with other carbon sources. Furthermore, six nitrogen-fixing genes were found to be responsible for the survival of K15 on a nitrogen-free medium. Based on its fermentation characteristics, K15 was cultured in a kitchen waste medium as a strategy for green and sustainable bacterial cellulose production. The SEM, XRD, and FTIR results indicated that synthesized cellulose has a mean diameter of 40-50 nm nanofiber, good crystallinity, and the same chemical structure. The K15 strain provides a highly viable alternative strategy to reduce the costs of bacterial cellulose production using agroindustrial residues as nutrient sources.
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