聚乳酸
生物降解
对苯二甲酸
水解
脂肪酶
降级(电信)
聚酯纤维
己二酸
材料科学
化学工程
化学
高分子化学
有机化学
酶
聚合物
工程类
电信
计算机科学
作者
Jia Hao,Min Zhang,Yunxuan Weng,Chengtao Li
标识
DOI:10.1016/j.jhazmat.2020.123679
摘要
A cocultivation of the Pseudomonas mendocina with Actinomucor elegans was developed and investigated to improve the biodegradation of polylactic acid/polybutylene adipate-co-terephthalate (PLA/PBAT). And the coculture system could produce an efficient PLA/PBAT-degrading enzymes system to degrade PLA/PBAT films. The results showed that the protease activity (11.50 U/mL) and lipase activity (40.46 U/mL) of the coculture exceeded that of the monoculture (P. mendocina of 7.31 U/mL, A. elegans of 32.47 U/mL). The degradation rate of PLA/PBAT films using the coculture system was 18.95 wt% within 5 days, which was considerably higher than that of P. mendocina (12.94 wt%) and A. elegans (9.27 wt%) individually, suggesting that P. mendocina and A. elegans had synergistic degradation. In addition, P. mendocina and A. elegans could secrete proteases and lipases, respectively, which could catalyze the ester bonds of PLA1 and PBAT in PLA/PBAT films, respectively, and hydrolyze them into different monomers and oligomers as nutrition sources. Therefore, the PLA/PBAT films could be completely degraded. In this study, the PLA/PBAT films were efficiently degraded in the coculture system for the first time, which significantly improved the biodegradation of PLA/PBAT films.
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