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在水解过程中从嵌入酶的可生物降解聚中释放的纳米塑料和微塑料

Ling Ma¹, Zi-Yang Fan¹, Wen-Qian Lian¹

¹College of Polymer Science and Engineering, Sichuan University, State Key Laboratory of Polymer Materials Engineering, Chengdu, Sichuan 610065, China.

Journal of hazardous materials

|February 19, 2025

概括

嵌入酶的可生物降解聚烯释放的微塑料 (MP) 和纳米塑料 (NP) 比使用外部酶的聚烯更多. 这些塑料颗粒持续存在,凸显了可生物降解材料的环境问题.

科学领域:

聚合物科学聚合物科学
环境科学环境科学
材料化学材料化学

背景情况:

可生物降解的聚烯为传统塑料提供了一个可持续的替代品.
酶介导的水解加速了这些材料的降解.
微塑料 (MP) 和纳米塑料 (NP) 从降解聚合物中释放是一种新兴的环境问题.

研究的目的:

调查MPs和NPs在化嵌入酶的聚乙烯 (PCL) 的过程中的形成和演变.
为了比较PCL释放的MPs和NPs与嵌入式酶与外部酶的释放.
评估由酶嵌入PCL产生的MP和NP的长期命运.

主要方法:

在PCL膜中嵌入脂酶PS酶.
监测PCL膜的消失和水解率.
随着时间的推移,使用粒子计数技术量化MP和NP.
分析国会议员和国民议员的大小分布.

主要成果:

嵌入的酶加速了PCL水解,导致膜在96小时内消失.
在96小时内,与外部酶PCL相比,嵌入酶PCL释放的MPs (2.4倍) 和NP (10倍) 量显著增加.
130天后,MP和NP持续存在,其数量与外部酶样本相比,MP的平均大小为1μm.

结论:

在可生物降解的聚合物中嵌入酶导致大量的MP和NP释放.
宏观侵蚀和微观链裂都会导致聚合物分解和颗粒形成.
管理MP和NP释放对于嵌入酶的可生物降解材料的环境安全至关重要.

关键词:

嵌入酶的可生物降解聚乙烯.水解是指水解过程中的水解.纳米塑料和微塑料的使用

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