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.

Determination of Citric Acid in Tea

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

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CDR DrinkLab

Test type: End Point.
Testing time: [uni].
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR DrinkLab.

Method

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

Sample treatment

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.

Principle of the test

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.

Calibration curve

Calibration Curve Citric Acid of CDR DrinkLab Method with the Reference Method

Reagent test Kits

Measuring range

The perfect system for you

Citric Acid

Oils and fats

Frying oils and fried snacks

Fish Oil

Olive oil

Palm oil

Bakery products and spreads

Nuts

Milk and dairy products

Egg products

Tomato derivatives

Vinegar

Food

Wine

Beer

Cider

Kombucha

Coffee Fermentation

Green coffee, roasted coffee and beverage

Water for coffee preparation

Analyses of Soft Drinks with CDR DrinkLab

Soft Drinks

Analyses of Fruit Juices with CDR DrinkLab

Fruit Juices

Tea Analysis from Leaves to Drink with CDR DrinkLab

Analyses of Plant-based Beverages with CDR DrinkLab

Plant-based Beverages 

Kefir

Analyses of Drinking Water with CDR DrinkLab