Characterisation and tanning effects of purified chestnut and sulfited quebracho extracts.

ABSTRACT: Vegetable tannins are environmentally friendly tanning agents. However, they generally impart a dark colour to the tanned leather and highly contribute to the organic load in wastewaters. In this study, we employed a purification protocol separately on chestnut tannin (CT) and sulfited quebracho tannin (QT) to obtain the purified fractions (PCT and PQT). These samples were characterised by GPC, ¹H NMR, ¹³C NMR, FT-IR, and HPLC-DAD techniques and applied for tanning tests. Through the purification process, non-tannin components and smaller molecules such as gallic acid, glucopyranose, and catechin were effectively removed from CT and QT, which consequently led to the reduced moisture content, pH value, and lighter colour of purified fractions. The crust leathers proces

SUBMITTER: Conca S 

PROVIDER: S-EPMC11378616 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature