Chemical composition of aubergine peel indicates that this biomass is high in pectin, with galacturonic acid having high degree of esterification, delphinidin and it`s glycosides, as well as phenolic compounds. Rich phytochemical profile of this biowaste makes it an interesting source for food, cosmetic and other applications. Chemical characterization of aubergine peel extract was carried out after extraction with hot compressed water, applying an extraction temperature of 130°C for 30 minutes. Total phenols quantified in extracts were 355.6±2.02 mg GAE/l, whereas total flavonoids and anthocyanins were 136.3±3.5 mg RE/l and 8.2±0.9 mg C-3-G, respectively. Extract exhibited good antioxidant and antiradical properties. Total antioxidant activity was 905.25±18.03 AAE/l, while activity against DPPH radicals was 532.36±0.02 AAE/l, and for ABTS radicals IC50 was 7.69±0.5. Pectin represented 3.99±0.2% in extract. Phytochemical screening of aubergine peel extract indicated the presence of free flavonoids, tannins, gallic tannins, O- and c-heterosides, coumarins and alkaloids.

Tanja Brezo-Borjan, Jaroslava Švarc-Gajić*, Marina Čobanov, Milana Maričić, Dragana Kovačević, Milan Stokrpa ; Faculty of Technology, University of Novi Sad, 21 000 Novi Sad, Serbia