Dehydrated olive-waste cake as a source of high value-added bioproduct: Drying kinetics, physicochemical properties, and bioactive compounds

ELSA URIBE; LEMUS MONDACA, ROBERTO; ALEX PASTEN; SEBASTIAN ASTUDILLO; ANTONIO VEGA-GÁLVEZ; LUIS PUENTE DÍAZ; DI SCALA, KARINA

CHILEAN JOURNAL OF AGRICULTURAL RESEARCH

INST INVESTIGACIONES AGROPECUARIAS

Lugar: Chillán; Año: 2014 vol. 74 p. 293 - 301

0718-5820

Olive oil processing produces significant amount of waste that can be utilized for the production of high value-added ingredients for various industrial applications. In this work, the effects of temperature on drying kinetics and quality indexes of the olive-waste cake during convective dehydration (40-90 °C) were investigated. Results on effective moisture diffusivity, physicochemical parameters, fatty acid profile, total phenolic, flavonoid and flavanol contents as well as antioxidant capacity are also reported. Most of the fatty acids increased their content with respect to control sample with a temperature increase, i.e. oleic and linoleic acids increased with 48% and 43% at 70 and 40 °C, respectively. Total flavanol content increased with temperature (from 48 to 62 mg CTE 100 g-1 d.m.) excepting at 80 °C. Total phenolic and total flavonoid contents were highly correlated to antioxidant capacity (0.923< r < 0.992), except at 70 and 80 °C, the rest of the samples maintained their initial antioxidant capacity by ORAC analysis. Thus, these parameters show that dried olive-waste has a high bioactive compound content with a potential use as additives for the food or other industries.