Faculty of Animal Science and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, 13635-900 Pirassununga, SP, Brazil; Food Research Center (FoRC), University of São Paulo, Rua do Lago, 250, Semi-industrial building, block C, 05508-080, São Paulo, SP, Brazil.
Department of Animal Reproduction, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil.
Int J Biol Macromol. 2020 Dec 1;164:1399-1412. doi: 10.1016/j.ijbiomac.2020.07.309. Epub 2020 Aug 5.
Biodegradation tests of chitosan (CH), polybutylene adipate terephthalate (PBAT) and high density polyethylene (HDPE) polymers were carried out using the standard OECD 301D guidelines. The results showed that the CH samples biodegraded faster than those of PBAT. Photographs registered exhibited the complete or partial disintegration of the samples, and a more opaque color was observed with the increase of biodegradation. FTIR analysis showed some changes in the intensity of the typical bands of the HDPE sample. The presence of P. nitroreducens bacteria was revealed on the PBAT sample surface by SEM studies. Additionally, a clear increase in elastic modulus (EM) and tensile strength (TS) values were observed in PBAT and HDPE samples on day 3, which decreased significantly at the end of the study. Furthermore, an increase in the crystallinity of the HDPE sample was observed on day 28.
采用 OECD 301D 标准指南对壳聚糖（CH）、聚对苯二甲酸丁二醇酯（PBAT）和高密度聚乙烯（HDPE）聚合物进行了生物降解测试。结果表明，CH 样品的生物降解速度快于 PBAT 样品。所记录的照片显示出样品的完全或部分崩解，并且随着生物降解的增加，观察到颜色变得更不透明。FTIR 分析显示 HDPE 样品典型谱带的强度发生了一些变化。通过 SEM 研究揭示了 PBAT 样品表面存在 P. nitroreducens 细菌。此外，在第 3 天，PBAT 和 HDPE 样品的弹性模量（EM）和拉伸强度（TS）值明显增加，在研究结束时显著降低。此外，在第 28 天观察到 HDPE 样品的结晶度增加。
