Different Extraction Techniques on the Characteristic Properties of Valonea Tannin

Year 2018, Volume: 14 Issue: 4, 435 - 442, 28.12.2018

Ersin Önem Ali Yorgancıoğlu Onur Yılmaz

https://doi.org/10.18466/cbayarfbe.449605

Abstract

Valonea
extract is a natural tannage widely applied in leather industry which is
produced via conventional hot water extraction method. On the otherhand more
environmental friendly methods have started to be used in extraction technology
recently. Present paper reports on the effect of different extraction methods
on the properties of valonea extracts. For this purpose, conventional solvent
extraction (CSE) (methanol/water mixture), supercritical CO₂ (scCO₂)
extraction and pressurized fluid extraction (PFE) (water/CO₂ binary
system) techniques have been employed on valonea and the obtained extracts have
been characterized. Molecular weight of the tannins was determined by gel
permeation chromatography (GPC), particle size was examined by Malvern
Zetasizer instrument, chemical structure by Fourier Transform Infrared
Spectroscopy (FTIR). Tannin content was also examined and the results were compared
with commercial valonea extract (CVT). The results showed that especially
particle size of the tannins was affected by the applied extraction method and
the smallest particle size was obtained by PFE method as 505.3 nm compared to
commercial tannin as 983.0 nm of average particle size. PFE method was also
provided more uniform extract according to the polydispersity index values. GPC
and FTIR analyses showed slightly differences on the characteristics of tannins.

Keywords

conventional solvent extraction, supercritical CO2 extraction, pressurized fluid extraction, Leather, valonea tannin

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