CDR DrinkLab is a quick, reliable and easy analysis system for the quality and process control of the beverage sector

Determination of Citric Acid in Tea

In the production of industrial teas, citric acid is often added as an acidity regulator or preservative. Ensuring that levels are within regulatory limits is essential to ensure product safety and compliance with food standards.

Method

Sample treatment

The sample must be centrifuged (code 222061) before the analysis.

Principle of the test

Through an enzymatic reaction, citric acid is converted to oxaloacetate and then to malate which reacts with NADH to produce NAD+. The decrease in absorbance, measured at 366 nm (end-point), of the NADH solution is proportional to the amount of citric acid present in the sample.

Calibration curve

The calibration curve of the CDR DrinkLab system, carried out using HPLC as a reference method, confirmed excellent linearity of the system throughout the measurement range.

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Reagent test Kits

Measuring range

AnalysesMeasuring rangeResolutionRepeatability

The perfect system for you

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CDR DrinkLab

  • Complete analysis panel, supplied already configured

  • Up to 16 determinations simultaneously

  • Possibility of carrying out analyses of the same sample

  • Integrated printer

  • Full connections (LAN - USB - Bluetooth barcode/QR code reader)