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CO 2 laser infrared optothermal spectroscopy for quantitative adulteration studies in binary mixtures of extra‐virgin olive oil
Author(s) -
Favier Jan Paul,
Bicanic Dane,
Cozijnsen Jan,
Veldhuizen Beb,
Helander Per
Publication year - 1998
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-998-0053-4
Subject(s) - spectroscopy , sunflower oil , olive oil , wavelength , analytical chemistry (journal) , interference (communication) , laser , chemistry , infrared , materials science , infrared spectroscopy , chromatography , optics , food science , optoelectronics , physics , organic chemistry , channel (broadcasting) , quantum mechanics , electrical engineering , engineering
Optothermal window spectroscopy at CO 2 laser infrared wavelengths was used to detect the extent of adulteration of extra‐virgin olive oil by sunflower and safflower oils. A good linearity between the strength of optothermal signal and the concentration of each adulterating compound was found. Predicted limits of detection presently attainable by this new method are 6 (w/w) and 4.5% (w/w) for extra‐virgin olive oil adulterated with safflower oil and sunflower oil, respectively, and were confirmed experimentally; the corresponding relative errors were 0.3 and 0.18%. Interference effects are comparable to those encountered in other spectroscopic methods at the same wavelength.