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The promiscuous activity of alpha-amylase in biodegradation of low-density polyethylene in a polymer-starch blend

机译：α-淀粉酶在聚合物-淀粉共混物中低密度聚乙烯生物降解中的混杂活性

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摘要

Blending polyolefins with certain types of natural polymers like starch can be beneficial to their biodegradation. The impact of alpha-amylase on the biodegradation of low-density polyethylene (LDPE)-starch blend samples in an aqueous solution was investigated through characterizing their physical, mechanical and chemical properties. Results indicated that the weight and tensile strength of the enzyme treated samples were reduced by 48% and 87% respectively. Moreover, differential scanning calorimetry (DSC) showed an increase in fusion enthalpy of degraded samples which means that the crystallinity has been increased. The biodegradation of LLDPE appeared in Fourier-transform infrared spectroscopy (FT-IR) through the reduction in the intensity of the related peaks. This observation was supported by energy dispersive x-ray spectroscopy (EDXS) analysis where decreasing the percentage of carbon atoms in the treated blend was obtained. Likewise, the gel permeation chromatography (GPC) results pointed to a significant reduction in both the molecular weight and viscosity of LDPE more than 70% and 60% respectively. Furthermore, thermal gravimetric analysis (TGA) affirmed the function of amylase in degradation of the blend. On the basis of the obtained results, it can be claimed that the main backbone of the polymer, as well as the side branches, have been scissored by the enzyme activity. In other words, alpha-amylase has a promiscuous cometabolic effect on biodegradation of LDPE in polymer-starch blends.
机译：将聚烯烃与某些类型的天然聚合物（如淀粉）共混可能有益于其生物降解。通过表征其物理，机械和化学特性，研究了α-淀粉酶对水溶液中低密度聚乙烯（LDPE）-淀粉共混物样品生物降解的影响。结果表明，经酶处理的样品的重量和抗张强度分别降低了48％和87％。此外，差示扫描量热法（DSC）显示降解样品的熔融焓增加，这意味着结晶度增加。通过降低相关峰的强度，LLDPE的生物降解出现在傅立叶变换红外光谱（FT-IR）中。能量色散x射线光谱法（EDXS）分析支持了这一观察结果，在该分析中，减少了处理混合物中碳原子的百分比。同样，凝胶渗透色谱法（GPC）的结果表明，LDPE的分子量和粘度均显着降低分别超过70％和60％。此外，热重分析（TGA）证实了淀粉酶在共混物降解中的功能。根据获得的结果，可以声称聚合物的主要主链以及侧支链已经被酶活性剪掉了。换句话说，α-淀粉酶对聚合物-淀粉共混物中的LDPE生物降解具有混杂的代谢作用。

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  • 期刊名称 Scientific Reports
  • 作者

    M. Karimi; D. Biria;

  • 作者单位
  • 年(卷),期 -1(9),-1
  • 年度 -1
  • 页码 2612
  • 总页数 10
  • 原文格式 PDF
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