1. Tung Oil-Based Production of High 3-Hydroxyhexanoate-Containing Terpolymer Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate-co-3-Hydroxyhexanoate) Using Engineered Ralstonia eutropha
- Author
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Hun-Suk Song, Yun-Gon Kim, Sun Mi Lee, Ranjit Gurav, Sol Lee Park, Shashi Kant Bhatia, Yung-Hun Yang, Kwon-Young Choi, Hye-Soo Lee, June-Hyung Kim, Hyun-Joong Kim, and Tae-Rim Choi
- Subjects
0106 biological sciences ,Ralstonia eutropha ,antioxidant ,Polymers and Plastics ,PHA ,02 engineering and technology ,01 natural sciences ,Bioplastic ,Polyhydroxyalkanoates ,Article ,lcsh:QD241-441 ,chemistry.chemical_compound ,Ralstonia ,lcsh:Organic chemistry ,Poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate) ,010608 biotechnology ,tung oil ,Copolymer ,Organic chemistry ,Eutropha ,biology ,polyhydroxyalkanoates ,Substrate (chemistry) ,General Chemistry ,021001 nanoscience & nanotechnology ,biology.organism_classification ,Monomer ,chemistry ,α-eleostearic acid ,0210 nano-technology - Abstract
Polyhydroxyalkanoates (PHAs) are attractive new bioplastics for the replacement of plastics derived from fossil fuels. With their biodegradable properties, they have also recently been applied to the medical field. As poly(3-hydroxybutyrate) produced by wild-type Ralstonia eutropha has limitations with regard to its physical properties, it is advantageous to synthesize co- or terpolymers with medium-chain-length monomers. In this study, tung oil, which has antioxidant activity due to its 80% α-eleostearic acid content, was used as a carbon source and terpolymer P(53 mol% 3-hydroxybytyrate-co-2 mol% 3-hydroxyvalerate-co-45 mol% 3-hydroxyhexanoate) with a high proportion of 3-hydroxyhexanoate was produced in R. eutropha Re2133/pCB81. To avail the benefits of α-eleostearic acid in the tung oil-based medium, we performed partial harvesting of PHA by using a mild water wash to recover PHA and residual tung oil on the PHA film. This resulted in a film coated with residual tung oil, showing antioxidant activity. Here, we report the first application of tung oil as a substrate for PHA production, introducing a high proportion of hydroxyhexanoate monomer into the terpolymer. Additionally, the residual tung oil was used as an antioxidant coating, resulting in the production of bioactive PHA, expanding the applicability to the medical field.
- Published
- 2021