“…One of the higher-value options is the recovery of bioactive plant food constituents such as polyphenols, which have antioxidant properties and could be used in the pharmaceutical, cosmetics and food industries. In spite of the numerous studies found in the literature on solid-liquid extraction (the most commonly used technology) of natural antioxidants from plant materials, data on the optimisation, modelling and simulation of this process are scarce, and often optimisation has been carried out by statistical approaches (Bucić -Kojić et al, 2007;Cacace and Mazza, 2003;Herodež et al, 2003;Ku and Mun, 2008;Liao et al, 2008;Pinelo et al, 2005;Simeonov et al, 1999;Spigno and De Faveri, 2009). However, there is a need for mathematical modelling, which, as a useful engineering tool, considerably facilitates the optimisation, simulation, design and control of processes and contributes to better utilisations of energy, time and solvent.…”