October 2008 - A valid alternative to the Rancimat method
In order to predict olive oil shelf-life, it is necessary to determine its resistance to oxidation, i.e. its oxidative stability. The official method employed to measure this parameter is the approved method that determines oil stability index, commonly known as Rancimat.
The study [1] published in the Journal of AOAC International [Vol. 91, No 4, 2008] validated the OxiTester photometric method for the determination of oil polyphenol content/stability index after comparing it with the Rancimat method.
This study, carried out by Minerva S.A. and N. Asteriadis S.A. enterprises in partnership with the University of Athens, has shown that the OxiTester method, used for the determination of polyphenol content/stability index, offers a valid alternative to the Rancimat method. In fact, the researchers determined a good correlation between the two methods for a wide range of virgin and extra virgin oil samples.
The study defines the OxiTester system as "A new photometric method for evaluation of oxidative stability of olive oil". In fact, OxiTester evaluates oil antioxidant power via the measurement of the amount of polyphenols contained in oil, in unaltered environmental conditions, thanks to the free radicals present in the reagent. In other words, the natural oxidation process that oil is prone to is simulated in a tube, while the Rancimat method foresees that oil is oxidized in a forced way.
Furthermore, another innovative feature of the OxiTester system is its capability of highlighting oil organoleptic characteristics since test results are correlated to polyphenol total content.
Oil stability index can be determined in just 6 minutes using the OxiTester system, while the Rancimat method requires delays of up to 10-12 hours. A further advantage offered by the OxiTester method lies in the fact that it does not require the instrumentation to be flushed.
For more information about Poliphenols/OSI analysis and OxiTester, please contact us
RESOURCES
"A new photometric method for evaluation of oxidative stability of olive oil" White Paper writed by CDR technicians.
[1] A novel photometric method for evaluation of the oxidative stability of virgin olive oils Journal of AOAC International, July-August, 2008, by Vassilis N. Kamvissis, Emmanouil G. Barbounis, Nikolaos C. Megoulas, Michael A. Koupparis .
The study [1] published in the Journal of AOAC International [Vol. 91, No 4, 2008] validated the OxiTester photometric method for the determination of oil polyphenol content/stability index after comparing it with the Rancimat method.
This study, carried out by Minerva S.A. and N. Asteriadis S.A. enterprises in partnership with the University of Athens, has shown that the OxiTester method, used for the determination of polyphenol content/stability index, offers a valid alternative to the Rancimat method. In fact, the researchers determined a good correlation between the two methods for a wide range of virgin and extra virgin oil samples.
The study defines the OxiTester system as "A new photometric method for evaluation of oxidative stability of olive oil". In fact, OxiTester evaluates oil antioxidant power via the measurement of the amount of polyphenols contained in oil, in unaltered environmental conditions, thanks to the free radicals present in the reagent. In other words, the natural oxidation process that oil is prone to is simulated in a tube, while the Rancimat method foresees that oil is oxidized in a forced way.
Furthermore, another innovative feature of the OxiTester system is its capability of highlighting oil organoleptic characteristics since test results are correlated to polyphenol total content.
Oil stability index can be determined in just 6 minutes using the OxiTester system, while the Rancimat method requires delays of up to 10-12 hours. A further advantage offered by the OxiTester method lies in the fact that it does not require the instrumentation to be flushed.
For more information about Poliphenols/OSI analysis and OxiTester, please contact us
RESOURCES
"A new photometric method for evaluation of oxidative stability of olive oil" White Paper writed by CDR technicians.
[1] A novel photometric method for evaluation of the oxidative stability of virgin olive oils Journal of AOAC International, July-August, 2008, by Vassilis N. Kamvissis, Emmanouil G. Barbounis, Nikolaos C. Megoulas, Michael A. Koupparis .