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
|