"Study On The Sourness Of Food And Its Electrochemical Measurement. 7. Conductometric Flow Injection Analysis Of The Organic Acid Content In Citrus Fruits"
Agric. Biol. Chem.
1984 Volume 48, Issue 9 Pages 2211-2215
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Kiyoshi MATSUMOTO, Koh-ichi ISHIDA, Takakazu NOMURA and Yutaka OSAJIMA
Abstract:
A flow injection system, incorporating a flow-through four-electrode cell for controlled-potential conductance measurements, is described. For the analysis, a sample (35 µL) of pure centrifuged fruit juice was injected into the carrier stream (flow rate 20 mL min-1), and the mixing-coil length was 100 cm. There was good correlation (r = 0.992) between peak conductance and acid content (as shown by addition of malic and citric acids to the juice). By this method, 50 samples could be analyzed in 1 h, and the coefficient of variation of the results for any given juice was 0.5% (n = 20). To reduce the viscosity of the juice, dilution (1:3 or 1:4) before injection is recommended.
Acids, carboxylic
Juice
Standard additions calibration
Viscosity
