Eucalyptus globulus Bark as Source of Tannin Extracts for Application in Leather industry
authors Pinto, PCR; Sousa, G; Crispim, F; Silvestre, AJD; Neto, CP
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords Eucalyptus globulus bark; Biorefinery; Phenolic compounds; Tannins; Water extraction; Retanning; Leather
keywords E-RUDIS; POLYPHENOLIC COMPOSITION; MASS-SPECTROMETRY; CAMALDULENSIS; CHROMATOGRAPHY; CHEMISTRY; WOOD
abstract This paper reports the extraction of Eucalyptus globulus bark and a concentration strategy to obtain a phenolic-rich extract for application in the leather tanning industry. The profiles of total phenolic compounds (TPC) and tannins contents in water and dilute alkali as a function of extraction temperature and time led to the selection of the best conditions concerning extraction yield and selectivity. The selectivity profile for TPC and tannins was established, and a maximum of 20 g per kg of bark was found, representing 2.5 g per L of extract produced. On the basis of these results, the conditions selected to produce the extract for the application envisaged in this work were: water, 140 degrees C and 120 min. To increase the extract concentration, recirculation of the extracts over fresh bark (similar to a continuous bark extraction process) was performed and evaluated. The increment in phenolic compounds was about 4, attaining the final concentration of 8.6 g/L for TPC and 6.5 g/L for tannins. The final extracts showed leather retanning aptitude equivalent to a commercial extract of chestnut and revealed good performance in the production of leather articles like box-calf and nubuck.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2013
volume 1
issue 8
beginning page 950
ending page 955
digital object identifier (doi) 10.1021/sc400037h
web of science category Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000322863100011
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journal impact factor 7.632
5 year journal impact factor 7.741
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