How to Ensure Taste and Safety of Non-Alcoholic Beverages and Softdrinks

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For very precise Brix measurements (e.g., concentrates, molasses) thermostatted instruments are the best choice. The reading occurs at a user-defined target temperature (typically 20°C). Thus, any temperature compensation error is omitted. Modern digital benchtop meters have built-in solid state thermostats. This keeps the temperature of the measuring cell and the sample constant at the selected temperature precisely. Brix readings as precise as ±0.003 Brix are possible.

Acid corrected Brix

As explained before, Brix applies to solutions of sucrose and water only. Fruit juices, however, contain other substances such as acids as well. These substances also influence the refractive index and lead to lower Brix readings. Thus, Brix values have to be corrected to compensate the contributions by the acids and represent the true sugar content of the sample.

An acidity based correction table stored in the refactometer is applied to calculate the acid corrected Brix value. The acidity is typically determined by titration. Citric acid is the main acidic component of the very popular citrus fruit juices.

Analysis systems combining refractometer with titrator and sample changer provide fully automated acid corrected Brix determinations (multiparameter systems). A single sample automation system is recommended for concentrates and other viscous samples. Fruit juices and beverages (i.e., consumer products) are analysed using multiple sample automation systems which can easily absorb sample series.

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