Metal Organic Framework Enzyme-Based Unhairing of Skins: A Step Toward Sustainable Leather Processing,ACS Sustainable Chemistry & Engineering

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Metal Organic Framework Enzyme-Based Unhairing of Skins: A Step Toward Sustainable Leather Processing
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-01-12 , DOI: 10.1021/acssuschemeng.3c07118
Anithabanu Palanisamy _{1,

2} , Thanikaivelan Palanisamy _{1,

2} , Vaidyanathan Vaidyanathan Ganesan _{1,

2}

Affiliation

Sustainability of the leather industry demands a paradigm shift from existing chemical-based processing to bio-based degradable systems. Enzyme-based unhairing systems are evolving as an eco-friendly alternative to sodium sulfide- and lime-based conventional unhairing process. However, factors such as uncontrolled enzyme activity over the skin thus resulting in poor quality of leather, cost, and poor recyclability limit their commercial exploitation. To overcome these challenges, herein, we synthesized zinc-based metal organic framework as a supporting matrix, immobilized the protease, and studied its efficiency and recyclability for unhairing of skins. ZnMOF and ZnMOF-protease (ZnMOF-Enz) were prepared and characterized by FTIR, DLS, XRD, XPS, HR-TEM, and FESEM analyses. The activity of the immobilized enzyme on ZnMOF was studied at different temperatures and pHs and optimized. The application of ZnMOF-Enz for unhairing of the goat skin was studied, and the hair removal efficiency was found to be efficient even after the four recycles with supplemented ZnMOF-Enz. The microscopic analysis results of the protease-treated and ZnMOF-Enz-treated skin reveal that the efficiency of ZnMOF-Enz was comparable to that of the protease-treated one even after a fourth cycle. The present study provides an insight into the usage of enzymes immobilized on MOFs as an alternative and sustainable approach for the unhairing process with a good recyclability factor.

中文翻译：

金属有机框架酶法脱毛：迈向可持续皮革加工的一步

皮革行业的可持续性需要从现有的基于化学的加工到基于生物的可降解系统的范式转变。基于酶的脱毛系统正在发展成为基于硫化钠和石灰的传统脱毛工艺的环保替代品。然而，诸如皮革上不受控制的酶活性等因素导致皮革质量差、成本高和可回收性差等因素限制了它们的商业开发。为了克服这些挑战，我们合成了锌基金属有机框架作为支撑基质，固定了蛋白酶，并研究了其对皮肤脱毛的效率和可回收性。制备了 ZnMOF 和 ZnMOF-蛋白酶 (ZnMOF-Enz)，并通过 FTIR、DLS、XRD、XPS、HR-TEM 和 FESEM 分析进行表征。在不同温度和pH下研究了ZnMOF上固定化酶的活性并进行了优化。研究了 ZnMOF-Enz 在山羊皮脱毛中的应用，发现即使在补充 ZnMOF-Enz 的四次回收后，脱毛效率仍然有效。蛋白酶处理和 ZnMOF-Enz 处理的皮肤的显微分析结果表明，即使在第四个周期后，ZnMOF-Enz 的效率也与蛋白酶处理的皮肤相当。本研究提供了关于使用固定在 MOF 上的酶作为脱毛过程的替代和可持续方法的见解，并具有良好的可回收性。

更新日期：2024-01-12

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