The project system of the present invention provide be rich in flavor go coffee therefore for the purpose of coffee.The settling mode system what of the present invention goes coffee therefore to blend ethyl isovalerate in coffee. When removing coffee therefore coffee being the kenel of coffee bean, opposite what coffee bean full dose, the mixing proportion of ethyl isovalerate is 1 ppb or more.本發明之課題係提供極富風味的去咖啡因之咖啡為目的。本發明之解決方式係於去咖啡因之咖啡中摻混異戊酸乙酯。去咖啡因之咖啡為咖啡豆之型態時,相對於咖啡豆全量,異戊酸乙酯的摻混比例為1 ppb以上。
