Determination of L-Malic acid in cider

By analyzing L-Malic acid and L-Lactic acid, it is possible to assess the correct progress of the malolactic fermentation.

With CDR CiderLab, a cider analysis system, the analytical method for determining L-Malic Acid is simpler than the reference method while based on the same principles.

Method

Test Principle

Enzymatic reaction involved in the determination of malic acid in cider and must


L-Malic acid is oxidized in an alkaline environment through an enzymatic reaction and converted into oxaloacetic acid, which in turn produces NADH. The increase of absorbance, measured at 366 nm (end-point), is directly proportional to the concentration of L-Malic acid in the sample.

Calibration curve

The calibration curve of CDR CiderLab, obtained using reference methods, confirms the excellent linearity of the system over the whole testing range.

CDR CiderLab calibration curve for the analysis of L-Malic acid in cider, obtained using reference methods. R² = 0.9837

Reagent test Kits

Measuring range

AnalysesMeasuring rangeResolutionRepeatability

The Analyzers for process and quality control in cider production

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CDR CiderLab

  • 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)
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CDR CiderLab Jr

  • Partial analysis panel, supplied configured with 3 analyses of your choice, implementable
  • Up to 3 determinations simultaneously
  • Wireless connection to external printer
  • USB connections
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