Covalent and Ionic Bonding between Tannin and Collagen in Leather making and shrinking: A MALDI-ToF study - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Journal of Renewable Materials Année : 2021

Covalent and Ionic Bonding between Tannin and Collagen in Leather making and shrinking: A MALDI-ToF study

Résumé

Collagen powder hydrolysates were reacted with a solution of commercial mimosa bark tannin extract. The mix- ture was prepared at ambient temperature and prepared at 80°C to determine what reactions, if any, did occur between the collagen protein through its amino acids and the polyphenolic condensed tannin. The reaction pro- ducts obtained were analyzed by matrix assisted laser desorption ionization time-of-flight (MALDI ToF) mass spectrometry. Reactions between the two materials did appear to occur, with the formation of a relatively small proportion of covalent and ionic linkages at ambient temperature but a considerable proportion of covalent lin- kages tannin-protein amino acids and the disappearance of ionic bonds. The linkages between the two materials appeared to be by amination of the phenolic –OHs of the tannin by the amino groups of the non-skeletal side chains of arginine, and by esterification by the –COOH groups of glutamic and aspartic acid of the aliphatic alcohol-OH on the C3 site of the flavonoid units heterocycle of the tannin. The proportion of covalent linkages increases markedly and predominate with increasing temperatures. This tightening of the tannin-protein covalent network formed may be an additional contributing factor both to leather wear resistance and performance as well to leather shrinking when this is subjected to excessive temperatures.
Fichier principal
Vignette du fichier
2021 Pizzi Tannin Collagen Leather MALDI JRM final Online.pdf (2.22 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03153869 , version 1 (26-02-2021)

Licence

Identifiants

Citer

Antonio Pizzi. Covalent and Ionic Bonding between Tannin and Collagen in Leather making and shrinking: A MALDI-ToF study. Journal of Renewable Materials, 2021, ⟨10.32604/jrm.2021.015663⟩. ⟨hal-03153869⟩
42 Consultations
468 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More