Degradation of Bioplastics in Soil and Their Degradation Effects on Environmental Microorganisms
| Autor: | Motoki Kubo, Dinesh Adhikari, Takamitsu Kai, Nobuyuki Kaneko, Kenzo Kubota, Masaki Mukai, Kiwako S. Araki |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Microorganism
food and beverages chemistry.chemical_element Biomass 02 engineering and technology 010501 environmental sciences Biodegradation 021001 nanoscience & nanotechnology complex mixtures 01 natural sciences Bioplastic Nitrogen Lactic acid chemistry.chemical_compound Agronomy chemistry Soil water Degradation (geology) Food science 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Agricultural Chemistry and Environment. :23-34 |
| ISSN: | 2325-744X 2325-7458 |
| DOI: | 10.4236/jacen.2016.51003 |
| Popis: | Degradation of three kinds of bioplastics and their effects on microbial biomass and microbial diversity in soil environment were analyzed. The degradation rate of bioplastic in soil was closely related to the main components in the bioplastics. Poly (butylene succinate)-starch (PBS-starch) and poly (butylene succinate) (PBS) were degraded by 1% to 7% after 28 days in a soil with an initial bacterial biomass of 1.4 × 109 cells/g-soil, however poly lactic acid (PLA) was not degraded in the soil after 28 days. When the powdered-bioplastics were examined for the degradation in the soil, PBS-starch also showed the highest degradability (24.4% degradation after 28 days), and the similar results were obtained in the case of long-term degradation experiment (2 years). To investigate the effect of bacterial biomass in soil on biodegradability of bioplastics, PBS-starch was buried in 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 bacterial biomass in soil. 16S rDNA PCR-DGGE analysis indicated that the bacterial diversity in the soil was not affected by the degradation of bioplastics. Moreover, the degradation of bioplastic did not affect the nitrogen circulation activity in the soil. |
| Databáze: | OpenAIRE |
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