Development of a voltammetric electronic tongue for discrimination of edible oils.
In this paper, we propose a novel strategy to perform cyclic voltammetric measurements with a platinum microelectrode directly in edible oil samples. The microelectrode was employed as an electronic tongue that, along with the application of chemometrics to the current-potential responses, proved useful for discriminating oils on the basis of their quality and geographical origin. The method proposed here is based on the use of suitable room temperature ionic liquids, added to oils as supporting electrolytes to provide conductivity to the low-polarity samples. The entire voltammograms, recorded directly on the oil/RTIL mixtures, were processed via principal component analysis and a classification technique (K nearest neighbors), to extract information on samples characteristics. Data processing showed that oils having different nature (i.e. maize and olive) or geographical origin (i.e. olive oils coming from different regions) can be distinguished.
Oliveri
Paolo
P
Department of Pharmaceutical and Food Chemistry and Technology, University of Genoa, Via Brigata Salerno 13, 16147 Genoa, Italy.
Baldo
M Antonietta
MA
Daniele
Salvatore
S
Forina
Michele
M
D003314:Corn Oil / Q000032:analysis*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D004573:Electrolytes / Q000737:chemistry; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D052578:Ionic Liquids / Q000737:chemistry; D008839:Microelectrodes; D000069463:Olive Oil; D010938:Plant Oils / Q000032:analysis*; D010984:Platinum / Q000737:chemistry; D013696:Temperature
D004573:Electrolytes; D052578:Ionic Liquids; D000069463:Olive Oil; D010938:Plant Oils; D010984:Platinum; D003314:Corn Oil