Comparison among several fiber coating for a solid phase microextraction (SPME) based electronic nose applied to wine discrimination

A comparison among several types of fiber coatings for solid-phase micro-extraction applied to an electronic nose is performed. Four different types of fiber coating have been used: 100 mum polydimethylsiloxane (PDMS), 65 mum polydimethylsiloxane/divinylbenzene (PDMS/DVB), 85 mum polyacrilate and 75 mum carboxen/polydimetilsiloxane (CAR/PDMS). The cell containing a tin dioxide multisensor was mounted inside the chromatograph oven connected to the gas chromatograph injector, by replacing the chromatographic column. Samples of five different wines elaborated with the majority varieties of the origin denomination (O.D.) "Vinos de Madrid" have been used for testing the discrimination capability of the system. Multivariate analyses as principal component analysis (PCA) and artificial neural networks (ANN) have been applied to the data to discriminate among the different wine samples