Bioactive components and antioxidant properties of γ-aminobutyric acid (GABA) tea leaves

► The 50% ethanol at 50-95 °C gave higher extraction yield. ► The 50-75% ethanol at 75-95 °C gave higher total phenols and catechins of extracts. ► Water at 50-75 °C gave higher GABA and theanine contents of extracts. ► Water extracts have the higher chelating ability on ferrous ions in all extracts. ► The 75% ethanol extract gave the higher scavenging ability on DPPH radicals.