Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 56, Issue 16, Pages 7384-7387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf800933x
Keywords
umami taste; taste sensor; poly(vinylpolypyrrolidone)
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A method for evaluating the umami taste intensity of green tea by a taste sensor system was established. Interference in the measurement from catechins was solved by removing the catechins from sample solutions with poly(vinylpolypyrrolidone). A 5.00 mM aqueous solution of glutamic acid monosodium salt was used as the standard solution. Sensor outputs were converted into EITuma, (estimated intensity of taste concerning umami) values. One unit on the EITuma, scale was defined as the amount of the sensor output corresponding to a difference in 1.2 times the concentration of the standard substance (glutamic acid monosodium salt). The umami taste intensity of green tea was classified into six grades on the EITuma scale. Sensory tests proved that the EITuma value had a high correlation to the human gustatory sense.
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