Advanced

A study of the recovery of the dietary fibres from olive mill wastewater and the gelling ability of the soluble fibre fraction

Galanakis, Charis M.; Tornberg, Eva LU and Gekas, Vassilis (2010) In LWT- Food Science and Technology 43(7). p.1009-1017
Abstract
A novel method of the recovery of a dietary fibre containing material from olive mill wastewater (OMW) was developed. Extraction was based on thermal treatment with mixtures of ethanol and acids, prior to the isolation of the alcohol insoluble residue (AIR). Different mixtures were tested and the extracted residues were characterized. The maximum AIR recovery accounted 64.8 g/100 g OMW dry matter, while the corresponding total fibre content was 5.1 g/100 g of the AIR. Despite the high potassium (8.4 g/100 g) and the low galacturonic acid content (3.3 g/100 g), AIR was able to form gels after a simple isolation and concentration of the soluble fraction. The soluble fibres were exclusively composed of pectin (93.9 and 6.1 mol/100 mol... (More)
A novel method of the recovery of a dietary fibre containing material from olive mill wastewater (OMW) was developed. Extraction was based on thermal treatment with mixtures of ethanol and acids, prior to the isolation of the alcohol insoluble residue (AIR). Different mixtures were tested and the extracted residues were characterized. The maximum AIR recovery accounted 64.8 g/100 g OMW dry matter, while the corresponding total fibre content was 5.1 g/100 g of the AIR. Despite the high potassium (8.4 g/100 g) and the low galacturonic acid content (3.3 g/100 g), AIR was able to form gels after a simple isolation and concentration of the soluble fraction. The soluble fibres were exclusively composed of pectin (93.9 and 6.1 mol/100 mol galacturonic acid and arabinose, respectively) with 59 mol/100 mol GalA degree of methylation. The viscoelastic properties of the gels were evaluated as a function of galacturonic acid content, where the gel rigidity and elasticity was found to increase exponentially with this parameter. A further treatment of the pectin material with citric acid during its concentration, allowed the formation of more rigid, but less elastic gels. (C) 2010 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gel, Olive pectin, Ethanol, Dietary fibres, Olive mill wastewater, Viscoelastic properties
in
LWT- Food Science and Technology
volume
43
issue
7
pages
1009 - 1017
publisher
Elsevier
external identifiers
  • wos:000278202300002
  • scopus:77955394941
ISSN
0023-6438
DOI
10.1016/j.lwt.2010.01.005
language
English
LU publication?
yes
id
e0e10678-d5f2-4a54-8e44-0816ed80b121 (old id 1631824)
date added to LUP
2010-07-21 10:54:57
date last changed
2018-05-29 09:23:36
@article{e0e10678-d5f2-4a54-8e44-0816ed80b121,
  abstract     = {A novel method of the recovery of a dietary fibre containing material from olive mill wastewater (OMW) was developed. Extraction was based on thermal treatment with mixtures of ethanol and acids, prior to the isolation of the alcohol insoluble residue (AIR). Different mixtures were tested and the extracted residues were characterized. The maximum AIR recovery accounted 64.8 g/100 g OMW dry matter, while the corresponding total fibre content was 5.1 g/100 g of the AIR. Despite the high potassium (8.4 g/100 g) and the low galacturonic acid content (3.3 g/100 g), AIR was able to form gels after a simple isolation and concentration of the soluble fraction. The soluble fibres were exclusively composed of pectin (93.9 and 6.1 mol/100 mol galacturonic acid and arabinose, respectively) with 59 mol/100 mol GalA degree of methylation. The viscoelastic properties of the gels were evaluated as a function of galacturonic acid content, where the gel rigidity and elasticity was found to increase exponentially with this parameter. A further treatment of the pectin material with citric acid during its concentration, allowed the formation of more rigid, but less elastic gels. (C) 2010 Elsevier Ltd. All rights reserved.},
  author       = {Galanakis, Charis M. and Tornberg, Eva and Gekas, Vassilis},
  issn         = {0023-6438},
  keyword      = {Gel,Olive pectin,Ethanol,Dietary fibres,Olive mill wastewater,Viscoelastic properties},
  language     = {eng},
  number       = {7},
  pages        = {1009--1017},
  publisher    = {Elsevier},
  series       = {LWT- Food Science and Technology},
  title        = {A study of the recovery of the dietary fibres from olive mill wastewater and the gelling ability of the soluble fibre fraction},
  url          = {http://dx.doi.org/10.1016/j.lwt.2010.01.005},
  volume       = {43},
  year         = {2010},
}