A kinetic approach to predict the potential effect of malaxation time-temperature conditions on extra virgin olive oil extraction yield. (February 2017)

• Record Type: Journal Article
• Authors: Trapani, S.; Guerrini, L.; Masella, P.; Parenti, A.; Canuti, V.; Picchi, M.; Caruso, G.; Gucci, R.; Zanoni, B.
• Is Part Of: Journal of food engineering. Volume 195(2017)
• Page Start: 182
• Page End: 190
• Publication Date: 2017-02
• Subjects: Coalescence -- Yield -- Kinetics -- Malaxation -- Olive oil -- Modelling; Food industry and trade -- Periodicals; Food -- Analysis -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Analyse -- Périodiques; Aliments -- Recherche -- Périodiques; 664.005
• DOI: 10.1016/j.jfoodeng.2016.09.032
• Languages: English
• ISSNs: 0260-8774

Abstract

Abstract: An original kinetic study of both oil coalescence phenomena and potential extra virgin olive oil extraction yield (i.e. apparent Extractability Index) was carried out at different malaxation time-temperature conditions using Abencor lab equipment to process olives (Frantoio cv) of a known degree of ripeness. The apparent Extractability Index was modelled at every malaxation temperature by pseudo first-order kinetics, where the yield rate constant was temperature dependent following the Arrhenius equation ( k 0 = 7.50 10 7 min −1 ; Ea = 54512 J/mol). Oil droplet coalescence, which was expressed as a relative variation in the percentage of oil droplets with a diameter of >30 μm, proved to be an time-dependent phenomenon only; the pseudo zero-order kinetics modelling was statistically significant, where the coalescence rate constant was equal to 0.033 min −1 . The above kinetics were applied in order to propose a synoptic chart to predict the potential effect of malaxation in isothermal conditions on EVOO extraction yield. Highlights: An original experimental approach was used to study olive paste malaxation. A time-temperature kinetic study was applied to predict malaxation phenomena. An apparent Extractability Index and oil droplet coalescence phenomena were considered. A synoptic chart was proposed to predict the potential effect of malaxation on yield. Phenomena that condition oil extraction yield changed as a function of temperature.