Salmi Omar, Laudisa Giulia, Rossi Filippo, Masi Maurizio
Dipartimento di Chimica, Materiali e Ingegneria Chimica "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Materials (Basel). 2025 Apr 18;18(8):1858. doi: 10.3390/ma18081858.
The tanning of hides is a practice deeply rooted in ancient times, but in the early 20th century, transitioning to an industrial model of leather and hide production, chrome tanning expanded globally due to its practicality, quality, and versatility. However, in recent decades, there has been a growing attention paid to the potential oxidation of the free chromium present in tanned leather, which could transform from an unharmful trivalent status into its carcinogenic hexavalent status. This phenomenon occurs in a very small fraction of hides, which is yet sufficient to exhibit significant activity. Hence, there is an evident need to explore further alternatives that allow avoiding oxidation. In this work, the performance of a sequence of selected antioxidants is evaluated in different oxidation conditions: simple stirring, UV-Vis-IR irradiation, and heating up to 75 °C. The official diphenylcarbazide-UV tool norm was used to quantify the hexavalent chromium amount. The results underline the effectiveness of 2,6-di-tert-butylphenol, and that its greatest preventative method of addition during the tanning process is together with the tanning agent. This approach will pave the way for researching alternative concepts and exploring perspectives to inhibit chromium issues.
皮革鞣制的做法在古代就已深深扎根，但在20世纪初，随着向皮革和兽皮生产的工业模式转变，铬鞣制因其实用性、质量和多功能性而在全球范围内得到扩展。然而，近几十年来，人们越来越关注鞣制皮革中游离铬的潜在氧化问题，游离铬可能从无害的三价状态转变为致癌的六价状态。这种现象在极少数皮革中出现，但仍足以表现出显著的活性。因此，显然有必要进一步探索能够避免氧化的替代方法。在这项工作中，对一系列选定的抗氧化剂在不同氧化条件下的性能进行了评估：简单搅拌、紫外-可见-红外辐照以及加热至75°C。使用官方的二苯卡巴肼-紫外工具标准来定量六价铬的含量。结果强调了2,6-二叔丁基苯酚的有效性，并且其在鞣制过程中最大程度的预防添加方法是与鞣剂一起使用。这种方法将为研究替代概念和探索抑制铬问题的前景铺平道路。
