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Degradation of three kinds of bioplastics and their effects on microbial biomass and microbial diversityin soil environment were analyzed. The degradation rate of bioplastic in soil was closelyrelated to the main components in the bioplastics. Poly butylene succinate-starch PBS-starchand poly butylene succinate PBS were degraded by 1% to 7% after 28 days in a soil with an initialbacterial biomass of 1.4 × 109 cells-g-soil, however poly lactic acid PLA was not degraded inthe soil after 28 days. When the powdered-bioplastics were examined for the degradation in thesoil, PBS-starch also showed the highest degradability 24.4% degradation after 28 days, and thesimilar results were obtained in the case of long-term degradation experiment 2 years. To investigatethe effect of bacterial biomass in soil on biodegradability of bioplastics, PBS-starch was buriedin three kinds of soils differing in bacterial biomass 7.5 × 106, 7.5 × 107, and 7.5 × 108 cells-g-soil.The rate of bioplastic degradation was enhanced accompanied with an increase of the bacterialbiomass in soil. 16S rDNA PCR-DGGE analysis indicated that the bacterial diversity in the soilwas not affected by the degradation of bioplastics. Moreover, the degradation of bioplastic did notaffect the nitrogen circulation activity in the soil.

KEYWORDS

Bioplastics, Biodegradation, Soil Microorganisms, Bacterial Diversity

Cite this paper

Adhikari, D., Mukai, M., Kubota, K., Kai, T., Kaneko, N., Araki, K.S. and Kubo, M. 2016 Degradation of Bioplastics in Soil and Their Degradation Effects on Environmental Microorganisms. Journal of Agricultural Chemistry and Environment, 5, 23-34. doi: 10.4236-jacen.2016.51003.





Autor: Dinesh Adhikari, Masaki Mukai, Kenzo Kubota, Takamitsu Kai, Nobuyuki Kaneko, Kiwako S. Araki, Motoki Kubo*

Fuente: http://www.scirp.org/



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