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Powdered hide model for vegetable tanning II: hydrolyzable tannin
- Brown, Eleanor M., Taylor, Maryann M., Bumanlag, Lorelie
- Journal of the American Leather Chemists Association 2015 v.110 no.1 pp. 19-22
- Castanea, collagenase, leather tanning, models, plant extracts, tannins, vegetables
- Vegetable tannages employ both condensed and hydrolyzable tannins. As part of our exploration of tanning mechanisms, we reported last year on interactions of the condensed tannin, quebracho, with powdered hide. In this study, the interactions of chestnut extract, a hydrolyzable tannin, with powdered hide samples are reported and compared with those of the condensed tannin. Hydrothermal stability of powdered hide treated with the hydrolyzable tannin reached a maximum of 75 deg C at a 40% offer, compared with 84 deg C for a similar offer of condensed tannin. The hydrolyzable tannin was much more effective at improving collagenase resistance, with nearly complete protection at <10% offer.