| Abstract
| - The present study was conducted to establish a sensitive, rapid,reliable, and accurate method fordetermining the acidity of coffee by flow injection analysis (FIA)using an electrochemical detectorwith a glassy carbon electrode and a carrier solution of ethanolcontaining 38 mM LiClO4 and 3mM 2-methyl-1,4-naphthoquinone (vitamin K3,VK3). FIA signals for 21 coffee samplesshowedgood correlation with titratable acidity, a common chemical measure ofthe sourness of coffee. FIAsignals were also related with sourness intensity determined by sensorypanel test. Change in theacidity of coffee, due to roasting of coffee beans, was monitored byFIA. The present method wasfound adequate for determining coffee acidity. Keywords: Coffee; acidity; titratable acidity; electrochemicaldetection
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