Magnesium sulfate was used in order to ensure dryness of the sample by means of an exothermic reaction, leading to phase separation and extraction of the compounds by the acetonitrile:ethyl acetate solution. To remove the matrix interference, a clean-up step was also performed. A dispersive solid phase extraction employing PSA together with Florisil was performed. PSA had the ability to retain matrix components, such as polar organic acids, sugars and fatty acids. Florisil improved sample clean-up, due to the sugars interaction with the polar surface of this sorbent (Koesukwiwat, Sanguankaew, & Leepipatpiboon, 2008; Kujawski et al., 2014; Prestes et al., 2009).