Published 2011
| Version v1
Publication
Valorisation of olive oil solid waste using high pressure-high temperature reactor
Contributors
Description
Response surface methodology was used to optimise the combined effects of malaxation time (t) and
aqueous citric acid solution (CA) added at the beginning of the malaxation step on total polyphenols
(TP) and o-diphenols (OD) content and the antiradical power (ARP) of the olive oil extracted from the Italian
olive fruits of Coratina cultivar. Different tests were performed according to a 32 full factorial design,
varying t from 30 to 90 min and the CA from 5 to 15 ml/kgpaste. Overall optimal conditions identified by a
numerical optimisation for the three responses were found to be at t = 30 min and CA = 13.79 ml/kgpaste
under which the model predicted TP = 604.52 lgCAE/goil, OD = 80.44 lgCAE/goil and ARP = 28.73
lgDPPH/llextract. There were also linear correlations between TP (R2 = 0.8176) and OD (R2 = 0.8633) values
of olive oil and waste water. The results of this study demonstrate that considerably short malaxation
time and relatively small amounts of citric acid were required to enhance the quality of olive oil. The outcome
of our study will therefore be of great value for the commercial production of olive oil with high
level of polyphenols and o-diphenols.
Additional details
Identifiers
- URL
- http://hdl.handle.net/11567/277389
- URN
- urn:oai:iris.unige.it:11567/277389