Improvement of the water brewing of Vietnamese green tea by pretreatment with supercritical carbon dioxide

► New methods have been proposed for preliminary supercritical CO2 circulation and decompression treatment of plant feedstock that improve the extractivity of goal components during brewing. ► The proposed treatment improves the extractivity of caffeine in the water phase during brewing Vietnamese green tea by 25-30%. ► CO2-treatment of plant feedstock proved to have antibacterial impact.