Microwave-assisted extraction of antioxidant compounds from sunflower hulls

IZQUIERDO, NATALIA; FLORES, DAVID CHÁVEZ; RODRÍGUEZ, MARCELA; MASCHERONI, RODOLFO; RAMOS, ARMANDO QUINTERO; NOLASCO, SUSANA; MADRIGAL, MIGUEL SANCHEZ

HEAT AND MASS TRANSFER

SPRINGER

Lugar: Berlin; Año: 2019 vol. 55 p. 3017 - 3027

0947-7411

The objective was to determine the adequate conditions for the microwave-assisted extraction of antioxidant compounds from theseed hull of sunflower hybrids. The existence of genetic and environmental variability in the phenolic content obtained under theselected extraction conditions was also analyzed. The extractions were carried out at 70 °C-20 and 90 °C-10 min, using water assolvent and a power of 600 W. The total phenol, flavonoid and antioxidant activity were evaluated. The microwave extractionprocess at 90 °C-10 min gave significantly higher values of total phenol (407.13 ± 6.11?512.71 ± 23.54 mg gallic acid⋅100 g−1hull), flavonoids (210.09 ± 6.15?297.64 ± 5.68 mg catechin⋅100 g−1 hull) and antioxidant activity (76.73 ± 4.40?110.80 ±3.51 μmol TE⋅g−1 hull) than those obtained at 70 °C-20 min. The cultivation environment also significantly affected theantioxidant yield, with total phenol and flavonoid contents being significantly higher for the hybrids grown in Balcarce thanfor those from Tandil. A significant interaction between hybrids and cultivation environmental was also observed for theantioxidant activity, indicating that the environmental effects were not similar among hybrids. The results of this study providevaluable information related to giving added value to a residue of the oil industry.