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Outline
Polydimethylsiloxane (PDMS) is widely applied in daily-use products, medical treatment and power industry. In order to achieve its harmless disposal, the microbial green degradation approach was explored, and the pyrolysis characteristics, composition, production mechanism and surface hydrophobicity (CSH) of microbial cell membrane during the degradation process were analyzed. Results demonstrated that CGMCC 0452 strain exhibited strong tolerance to high-viscosity PDMS when polydimethylsiloxane (PDMS) was treated with Pseudomonas aeruginosa strain (CGMCC 0452). With the extension of degradation days, the CSH increased to 16%, and the CO stretching vibration of the carbonyl group in the chemical structure of the rhamnolipid chain was detected at 1712 cm-1 by Fourier transform infrared spectroscopy. Gel permeation chromatography analysis revealed that the weight-average molecular weight and number-average molecular weight of PDMS decreased by 29130 Da and 21701 Da, respectively. Based on the above results, combined with comprehensive analysis of gas chromatography-mass spectrometry, it was determined that the long chain of polysiloxane was mainly degraded into cyclosiloxane oligomers (D5, D6, D8, D9), and the degradation products did not appear toxic and harmful substances. Finally, the CSH enhancement mechanism (rhamnolipid adsorption and cell membrane lipopolysaccharide loss) and cyclosiloxane oligomer formation mechanism were revealed from the micro level. This paper provides a novel research idea for the efficient and harmless treatment of polysiloxane, and offers a valuable reference for investigating the biodegradation mechanism of polymers.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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