Analysis of K270 parameter in Olive Oil
In addition to providing useful information on the quality of oil and on its degree of oxidation, this test enables to identify rectified oil added to virgin olive oil, by leveraging the fact that mechanically extracted oils do not contain double or triple conjugated bonds that typically form during rectification.
Rectified oils therefore exhibit high UV absorbance values, specifically in the 270 nm region, which are significantly higher as compared to those of virgin and extra virgin oils. The greater absorption in the 270 nm region, during the most advanced oxidation stages, is determined also by the formation of ketone groups.
Method
Sample treatment
Use oil as is.
Principle of the test
The oil sample is dissolved in an appropriate solvent and the absorbance of the solution is read at 270 nm. Absorbance values are expressed as specific extinction E 1% 1 cm (1% extinction of a fatty substance in the prescribed solvent at a thickness of 1 cm), which is generally indicated as K and sometimes called extinction factor.
Calibration curve
The test calibration curve, obtained using reference methods, confirms the excellent linearity of the system in all the testing range.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
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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, customisable configuration
Up to 3 determinations simultaneously
Wireless connection to external printer
USB connections