The taste characteristic of Shiikuwasha juice was measured witha taste sensor method.11 Briefly, 50mL of reference solution of30 mmol L−1 KCl containing 0.3 mmol L−1 tartaric acid, whichcorresponded to human saliva, was used to immerse the tastesensor and reference probes in a taste sensor system (SA402B,Intelligent Sensor Technology, Inc., Kanagawa, Japan) for 30 s