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Microwave-irradiated tanning reaction of aluminum with collagen

机译：微波照射铝与胶原铝的鞣制反应

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Given the toxicity of chrome tanning in leather industry, ecologically compatible alternatives are intensively researched, in particular on the side of aluminum tanning. Herein, the tanning reaction of aluminum with collagen was investigated using microwave irradiation as a new heating method, and the traditional water bath heating (WBH) was used as control. Results from dynamic light scattering and very-positive differential scanning calorimetry (DSC) analysis reveal that, microwave heating led to larger particle size and increased main denaturing transition temperature of collagen clusters crosslinked by aluminum sulfate. The aluminum-tanned collagen products obtained under microwave and WBH methods were further compared and characterized using many techniques including circular dichroism, fluorescence spectroscopy, atomic force microscope, and Fourier transform infrared spectroscopy, DSC, and thermogravimetry. Results verified that both heating methods accelerate the crosslinking reaction of aluminum with collagen and increase the crosslinking degrees. The crosslinked products exhibited improved thermal stability, but no change was observed concerning the binding mode of aluminum with collagen. However, compared to WBH microwave heating has a more positive effect on the aluminum-tanning processes for the improvement of collagen crosslinking processes and product performances, probably due to both thermal and nonthermal effects of microwave irradiation. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48682.
机译：鉴于铬鞣制在皮革工业中的毒性，生态兼容的替代方案都集中研究，特别是在铝晒黑的一侧。这里，使用微波辐射作为一种新的加热方法研究了铝与胶原铝的鞣制反应，并使用传统的水浴加热（WBH）作为对照。由动态光散射和非常正差分扫描量热法（DSC）分析结果显示，微波加热导致较大的粒度和通过硫酸铝交联的胶原簇的主要变性温度增加。进一步比较了在微波和WBH方法下获得的铝鞣胶原产品，并使用包括圆形二色性，荧光光谱，原子力显微镜和傅里叶变换红外光谱，DSC和热重定测定的许多技术。结果证实，两种加热方法都加速了铝与胶原铝的交联反应并增加交联度。交联的产品表现出改善的热稳定性，但没有观察到胶原铝的结合方式没有变化。然而，与WBH微波加热相比，对改善胶原蛋白交联工艺和产品性能的铝制过程具有更大的影响，可能是由于微波辐射的热和非热效应。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48682。

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