ANTIOXIDANT CAPACITY AND FLAVOR PRESERVED HAZELNUT EXTRACT, MACERATION AND SC-CO2 EXTRACTION AND COMPARISON OF EXTRACTION METHODS

Abstract

In this study, Tombul type hazelnuts (Corylus avellana L.) were extracted by supercritical carbondioxide (SC-CO2) extraction and maceration method. The extraction yielded in 8.5% by SC-CO2 extraction when 0.84% by maceration. Extracted hazelnuts were analyzed by Dynamic Headspace Analysis/Gas Chromatography-Mass Spectrometry and 24 volatile compounds were detected after SC-CO2 method while 41 compounds were detected after maceration. Flavour and antioxidant value preserved Hazelnut extract by SC-CO2 technique showed better radical scavenging ability in 2,2-Diphenyl-1-picrylhydrazyl (DPPH) than the one by maceration. Antioxidant activities of the extracts obtained by SC-CO2 (12.35±0.06 μg/mL) and by maceration (8.79±0.23 μg/mL) had a medium impact compared with the synthetic antioxidant standards (P< 0.05). No significant difference was observed between the total phenolic contents of the hazelnut extracts obtained by SC-CO2 method and by maceration (P < 0.05). As a result, SC-CO2 technique for extraction of Tombul type hazelnuts was concluded to be more beneficial and suitable compared to maceration technique.