Researchers have designed a laser-based sensor that can detect counterfeit olive oil labeled as extra virgin or protected designation of origin.
The tool, described in the journal Talanta, can distinguish between apparently similar oils that present notable differences in quality.
This is possible thanks to the use of laser diodes because the fluorescence emitted by adulterated oils is slightly different to that of pure extra virgin olive oils.
The 3D-printed tool is inexpensive both to use and to manufacture, said researchers at the Complutense University of Madrid (UCM) in Spain and the Scintillon Institute in the US.
One example of fraudulent practice, noted Torrecilla, is adulterating fresh, pure virgin olive oil with inferior, cheaper olive oil or oils of another botanical origin.
Researchers mixed single-varietal, protected designation of origin oils with other protected designation of origin oils that were past their “best before” date. All the oils were purchased from shopping center stores.
Subsequently, mixtures were made using oils with between 1 and 17 percent acidity that were also past their “best before” date.
Measurements were performed using the sensor, which was manufactured with a 3D printer, and an analysis was conducted of the results obtained by means of chaotic algorithms.