Modification of collagen with three novel tannages, sulfonated calix[4]arenes

International Journal of Biological Macromolecules
Yongxiang ZhouHuijun Ren

Abstract

Chromium (III) salts are the most extensively used tanning agents due to the higher quality and stabilization ability to leather collagen. However, chromium (III) salts tanning agent has a strong impact on the environment owing to the pollution of wastewater and the solid waste containing chrome. In order to crosslink the collagen by a cleaner method, three kinds of sulfonated calix[4]arenes {sulfonated calix[4]arene (SC), sulfonated tetraphenyl calix[4]resorcinarene (STCR), and sulfonated tetramethylene tetraphenyl calix[4]resorcinarene(STTCR)} were prepared and utilized for the collagen crosslinking and leather tanning. The collagen crosslinking degree of sulfonated calix[4]arenes was investigated by fourier transform infrared (FTIR), thermogravimetric analysis (TG), differential scanning calorimetry (DSC), scanning electron micrograph (SEM), and X-ray photoelectron spectroscopy (XPS). The results show that the collagen can be crosslinked by phenol hydroxyl groups on sulfonated calix[4]arenes. Moreover, STCR shows better crosslinking effects than others because the number of phenol hydroxyl groups and the position of sulfonic groups on sulfonated calix[4]arenes play important roles in the crosslinking process. These results c...Continue Reading

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