KRİTİK ALTI SU İLE FINDIK ATIKLARINDAN ANTİOKSİDAN BİLEŞİKLERİN EKSTRAKSİYONU

Turkey is the world leader in hazelnut production and export. Large amount of wastes such as shell, husk and prunings are produced during the agriculture and processing of hazelnuts. Treatment of hazelnut wastes using an eco-friendly technology and production of valuable products can add value to those. In this study, total phenolic content (TPC) and total antioxidant activity (TAA) in the liquors of hazelnut wastes from subcritical water extraction at different temperature (150-200C) and time (0-45 min.) values were analyzed. Generally, higher yields were obtained by subcritical water extraction compared to solvent extraction. As temperature increased, TPC and TAA obtained from shells increased. Increase in time did not have a statistically significant effect at 180C; however, TPC increased significantly with time at 190C (P <0.05). The combined effect of temperature and time on hazelnut shells was examined in a single variable by calculating logarithmic value of severity factor (log Ro). TPC (905.3-2115.7 mg GAE/100 g shell) and TAA (8163.9-12261.5 mg TE/100 g shell) increased with log Ro.