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

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 firstorder kinetics, where the yield rate constant was temperature dependent following the Arrhenius equation (k0 ¼ 7.50 107 min1; Ea ¼ 54512 J/mol). Oil droplet coalescence, which was expressed as a relative variation in the percentage of oil droplets with a diameter of >30 mm, proved to be an timedependent phenomenon only; the pseudo zero-order kinetics modelling was statistically significant, where the coalescence rate constant was equal to 0.033 min1. 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.