Lignin is considered an underutilized natural biomass, and efficient and economical techniques are required for the total transformation of lignin into high-value products. In this study, the bacteria capable of transforming lignin-derived aromatics into functional, beneficial, or economically valuable compounds from the seawater after the Great East Japan Earthquake-caused tsunami were isolated. One of the isolates, Pseudomonas sp. ITH-SA-1, produced novel non-aromatic polymeric substances with fluorescent activity (NAPSFA) from the lignin-derived aromatic.
This research includes three keys for scientific importance: 1) NAPSFA are organic chemically rare fluorescent substances. This finding is surprising in view of the fact that fluorescence is typically associated with aromatic organic compound. Despite the absence of aromatic molecule’s structure, NAPSFA has a fluorescent activity. 2) NAPSFA are organic-conjugated polymers with light-emitting. Such polymers are known to be usefully utilized in the optoelectronic and electrochemical fields. 3) NAPSFA are produced from lignin-derived aromatics through bioconversion. These information will contribute to the development of new basic techniques for effective utilization of lignin and lignin-derived aromatic using biotechnology.
The authors believe that the discoveries made in the study will assist in the long-term recovery and reconstruction of the area affected by tsunami following the Great East Japan Earthquake, and contribute to the recovery effort by enhancing the growth of an industry devoted to the development of novel application.
Noriyuki Iwabuchi*1, Hajime Takiguchi1, Takashi Hamaguchi1, Hayato Takihara1, Michio Sunairi1, Hiroshi Matsufuji*2Show Affiliations
- Department of Applied Biological Science, College of Bioresource Sciences,Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
- Department of Food Bioscience and Biotechnology, College of Bioresource Sciences,Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
We examined bacteria capable of transforming lignin-derived compounds into industrially or economically valuable substances from the seawater after the Great East Japan Earthquake-caused tsunami. Pseudomonas sp. ITH-SA-1 produced water-soluble fluorescent substances from the lignin-derived aromatic, syringaldehyde (SYAL). They: are polymeric substances derived from 3-O-methyl gallate produced through transformation of syringaldehyde via syringate; are not known compounds reported previously; have excitation/emission peaks at 365/498 nm, respectively; and have an average molecular weight of 7.2 kDa. Despite the fact that aromatic structure generally plays an important role in the planarity and rigidity of organic fluorescent substance, the spectroscopic analyses revealed that aromatic rings were not detected in the molecules. Their activity is particularly rare and the biotransforming capabilities will contribute to the development of new basic techniques for the effective utilization of lignin.
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