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| Isolation of PBAT plastic-degrading bacteria and their degradation characteristics |
| Received:July 29, 2020 |
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| KeyWord:polyadipate/butylene terephthalate;microbiological degradation;agricultural film;plastic mulch |
| Author Name | Affiliation | E-mail | | LIU Jia-xi | College of Life Sciences, Northwest A&F University, Yangling 712100, China | | | HOU Li-jun | College of Life Sciences, Northwest A&F University, Yangling 712100, China | | | LIU Ting-ting | College of Science, Northwest A&F University, Yangling 712100, China | | | WANG Pei-yuan | College of Life Sciences, Northwest A&F University, Yangling 712100, China | | | GAO Xiang | College of Innovation and Experiment, Northwest A&F University, Yangling 712100, China | | | LIN Yan-bing | College of Life Sciences, Northwest A&F University, Yangling 712100, China | linyb2004@nwafu.edu.cn |
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| Abstract: |
| PBAT(polyadipate/butylene terephthalate)mulch is one of the most common biodegradable mulches. It is eco-friendly and has good heat resistance and ductility. PBAT mulch has gradually been commercialized, and the output of it is currently increasing year by year. We obtained bacterial resources that could efficiently degrade PBAT mulch film, by isolating plastic-degrading bacteria from environments where plastics have existed for a long time. A total of 6 potential PBAT plastic-degrading bacterial strains were isolated, and two highly efficient PBAT-degrading strains(Pseudomonas sp. RD1-3 and Pseudomonas sp. N1-2)were identified based on their PBAT degradation performance. After 8 weeks of degradation at 28℃, strains RD1-3 and N1-2 showed PBAT degradation rates of 6.88%±0.06% and 6.49%±0.01%, respectively. The two strains increased the surface roughness of the PBAT mulch and formed many gullies, pits, and folds on the surface. In addition, the two strains reduced the hydrophobicity of the PBAT plastic mulch surface, and introduced new polar functional groups such as -C≡N, -C=C- and -OH into the mulch. The strains RD1-3 and N1-2 are preliminarily determined to have good PBAT degradation ability. The results of this study expand the resource library of PBAT plastic degradation bacteria and provide theoretical support for further research into PBAT plastic degradation. |
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