UV Light Degradation of Polylactic Acid Kickstarts Enzymatic Hydrolysis

IF 5.7 Q2 CHEMISTRY, PHYSICAL ACS Materials Au Pub Date : 2023-11-02 DOI:10.1021/acsmaterialsau.3c00065
Margaret H. Brown, Thomas D. Badzinski, Elizabeth Pardoe, Molly Ehlebracht and Melissa A. Maurer-Jones*, 
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Abstract

Polylactic acid (PLA) and bioplastics alike have a designed degradability to avoid the environmental buildup that petroplastics have created. Yet, this designed biotic-degradation has typically been characterized in ideal conditions. This study seeks to relate the abiotic to the biotic degradation of PLA to accurately represent the degradation pathways bioplastics will encounter, supposing their improper disposal in the environment. Enzymatic hydrolysis was used to study the biodegradation of PLA with varying stages of photoaging. Utilizing a fluorescent tag to follow enzyme hydrolysis, it was determined that increasing the amount of irradiation yielded greater amounts of total enzymatic hydrolysis by proteinase K after 8 h of enzyme incubation. While photoaging of the polymers causes minimal changes in chemistry and increasing amounts of crystallinity, the trends in biotic degradation appear to primarily be driven by photoinduced reduction in molecular weight. The relationship between photoaging and enzyme hydrolysis appears to be independent of enzyme type, though commercial product degradation may be impacted by the presence of additives. Overall, this work reveals the importance of characterizing biodegradation with relevant samples that ultimately can inform optimization of production and disposal.

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紫外线降解聚乳酸启动酶水解作用
聚乳酸(PLA)和生物塑料都具有设计的降解性,以避免石油塑料造成的环境污染。然而,这种设计的生物降解通常是在理想条件下进行的。本研究试图将聚乳酸的非生物降解与生物降解联系起来,以准确反映生物塑料在环境中不当处置时会遇到的降解途径。酶水解法用于研究聚乳酸在不同光老化阶段的生物降解。利用荧光标签跟踪酶水解,结果表明,在酶培养 8 小时后,辐照量的增加会导致蛋白酶 K 的总酶水解量增加。虽然聚合物的光老化会导致化学性质的微小变化和结晶度的增加,但生物降解的趋势似乎主要是由光诱导的分子量降低引起的。光老化与酶水解之间的关系似乎与酶的类型无关,但商业产品的降解可能会受到添加剂的影响。总之,这项研究揭示了利用相关样本描述生物降解特征的重要性,最终可为优化生产和处理提供信息。
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ACS Materials Au
ACS Materials Au 材料科学-
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5.00
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期刊介绍: ACS Materials Au is an open access journal publishing letters articles reviews and perspectives describing high-quality research at the forefront of fundamental and applied research and at the interface between materials and other disciplines such as chemistry engineering and biology. Papers that showcase multidisciplinary and innovative materials research addressing global challenges are especially welcome. Areas of interest include but are not limited to:Design synthesis characterization and evaluation of forefront and emerging materialsUnderstanding structure property performance relationships and their underlying mechanismsDevelopment of materials for energy environmental biomedical electronic and catalytic applications
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