Regeneration of native collagen from hazardous waste: chrome-tanned leather shavings by acid method

Eco‐friendly polymer composites: A review of suitable methods for waste management

“…Alternative methods to chrome shavings management are the collagen extract that reaches more than 95% of dechroming degree by acid routes. [ 99,100 ] Heavy metals are also removed from leather sludge by pyrolysis in a torch plasma reactor combined to precipitation methods or adsorption over organic materials. [ 101 ]…”

“…Alternative methods to chrome shavings management are the collagen extract that reaches more than 95% of dechroming degree by acid routes. [99,100] Heavy metals are also removed from leather sludge by pyrolysis in a torch plasma reactor combined to precipitation methods or adsorption over organic materials. [101] The use of chrome-tanned leather wastes as fillers in rubber blends revealed an increase in tear strength attributed to the fibrous features of the waste.…”

Green Biocompatible Method for the Synthesis of Collagen/Chitin Composites to Study Their Composition and Assembly Influence on Fibroblasts Growth

“…The XRD (Figure S4) diffractograms of pure chitin (C100) showed peaks at 2θ of 8.4° and 19.5° at pH 3 and 8. Pure collagen (C00) presented a diffraction peak at 7.6°, associated with the intermolecular lateral packing distance between collagen molecular chains, and a broad peak at around 20°, attributed to diffused scattering. , At both the pH levels, the 8.4° chitin diffraction peak and the 7.6° collagen diffraction peak appeared to coexist in the composites, being one overlapped on the other. The 19.5° chitin diffraction peak, instead, got broader by increasing the collagen amount until it completely interconverted into the broad collagen diffraction peak.…”

“…The major absorption bands associated with collagen were amide I (1653 cm −1 ), II (1544 cm −1 ), III (1237 cm −1 ), A (3321 cm −1 ), and B (3080 cm −1 ). 44 Chitin showed intense absorption bands for amide I (1653 cm −1 ) and II (1558 cm −1 ), CH bending (1374 cm −1 ), four signals related to ring stretching (1155, 1112, 1069, and 1031 cm −1 ), N−H stretching (3277 cm −1 ), and O− H stretching (3447 cm −1 ). 14 Moving from C100 to C00, an increase in the relative intensity of the collagen absorption bands was observed along with a decrease in that of chitin ones.…”

“…The ATR-FTIR spectra (Figure S3) of C00 and C100 showed the typical absorption bands of chitin and collagen, as reported in the literature. The major absorption bands associated with collagen were amide I (1653 cm –1 ), II (1544 cm –1 ), III (1237 cm –1 ), A (3321 cm –1 ), and B (3080 cm –1 ) . Chitin showed intense absorption bands for amide I (1653 cm –1 ) and II (1558 cm –1 ), CH bending (1374 cm –1 ), four signals related to ring stretching (1155, 1112, 1069, and 1031 cm –1 ), N–H stretching (3277 cm –1 ), and O–H stretching (3447 cm –1 ) .…”