CDR OxiTester - the analysis system of olive oil used at the olive oil mill without specialised personnel or a chemical laboratory

Analysis of the Acidity of Olive Oil

The acid content of olive oil is given by the quantity of free fatty acids deriving from the hydrolytic rancidity of triglycerides. As this alteration occurs in unsuitable conditions for the processing and preservation of oil, acidity represents a basic indicator of the genuineness of the product. The test is particularly important for the definition of product categories. This test has the same accuracy and yet it is easier than AOCS Official Method Ca 5a-40.

Features and benefits of CDR OxiTester

With the method developed by the CDR laboratories, it is possible to easily carry out acidity (FFA) analysis of olive oil and extra virgin olive oil in 1 minute, not only in the laboratory, but also along the production line of an oil mill, at acceptance or at the purchase and sale stage. The CDR method simplifies and speeds up the official procedure, the results are correlated with the reference AOCS method.


Principle of the test

Free fatty acids of the sample, at pH<7,0, react with a chromogenic compound and decrease its color. The decreasing of color, read at 630 nm, is proportional to the acid concentration of the sample, expressed as % of oleic acid.

Calibration Curve

The calibration curve of the CDR OxiTester analytical method with the titration reference method was very good.


Reagent test Kits

Measuring range

AnalysesMeasuring rangeResolutionRepeatability

Analyzers for quality control of olive oil


CDR OxiTester

  • 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)

CDR OxiTester 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