Aerobic biodegradation of poly(lactic acid) (PLA) in thermoplastic starch (TPS) blends in soil induced by gelatin

IF 4.1 2区环境科学与生态学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY International Biodeterioration & Biodegradation Pub Date : 2024-06-14 DOI:10.1016/j.ibiod.2024.105831

Ricardo Camacho Muñoz, Héctor Samuel Villada Castillo, José Luis Hoyos Concha, José Fernando Solanilla Duque

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Abstract

PLA is a biopolymer with great potential for use in agriculture, but its biodegradability in soil is slow. PLA degrading microorganisms exist in soil and their activity can be improved with the addition of proteins. The aim of this work was to study the effect of gelatin addition on the final biodegradation of TPS/PLA blends in soil. After 180 days, the final biodegradation percentages for TPS, GE and PLA were 96%, 79% and 0%, respectively. The extruded blends of TPS/PLA/GE, TPS/PLA and PLA/GE, presented ultimate biodegradability of 63%, 57% and 25% respectively. The biodegradation rate during the initial stages was reduced due to the interaction of the components, without affecting the final values. There was rapid biodegradation of the TPS and gelatin fractions in the materials, while PLA did not undergo any mineralization process in the soil. The inclusion of gelatin in the matrix and in the soil did not increase the biodegradability of the PLA fraction in the extruded, nor in the control blends because the microorganisms present in the inoculum did not assimilate the PLA.

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明胶诱导热塑性淀粉（TPS）混合物中的聚乳酸（PLA）在土壤中的有氧生物降解

聚乳酸是一种生物聚合物，在农业领域具有巨大的应用潜力，但其在土壤中的生物降解能力较慢。土壤中存在可降解聚乳酸的微生物，添加蛋白质可提高它们的活性。这项工作的目的是研究添加明胶对 TPS/PLA 混合物在土壤中最终生物降解的影响。180 天后，TPS、GE 和 PLA 的最终生物降解率分别为 96%、79% 和 0%。TPS/PLA/GE、TPS/PLA 和 PLA/GE 挤压混合物的最终生物降解率分别为 63%、57% 和 25%。由于各成分之间的相互作用，初始阶段的生物降解率有所降低，但不影响最终值。材料中的 TPS 和明胶组分的生物降解速度很快，而聚乳酸在土壤中没有任何矿化过程。在基质和土壤中加入明胶并没有提高挤压和对照混合物中聚乳酸部分的生物降解性，因为接种物中的微生物没有同化聚乳酸。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Biodeterioration & Biodegradation 生物-环境科学

CiteScore

9.60

自引率

10.40%

发文量

107

审稿时长

21 days

期刊介绍： International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.