کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
744978 894409 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
SPME coupled to an array of MOS sensors: Reduction of the interferences caused by water and ethanol during the analysis of red wines
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
SPME coupled to an array of MOS sensors: Reduction of the interferences caused by water and ethanol during the analysis of red wines
چکیده انگلیسی

A solid phase microextraction (SPME) system has been coupled to an array of metal oxide sensors. The influence of the experimental conditions used in the injection system in the response of the sensors has been analysed. Moreover, with the help of data obtained from gas chromatography, the system has been optimized to reduce the presence of water and ethanol in the sensors chamber while efficiently retaining and concentrating other volatiles present in wine. The best results in terms of elimination of water and ethanol, reproducibility of the signals and discrimination capability are obtained using a polar absorbent fiber such as the polyacrilate fiber. The performance of the sensory system is drastically improved if the thermal desorption is carried out in two steps (a first desorption at low temperature to dry the fiber followed by a thermal desorption at high temperature). Principal component analysis of the signals obtained using the optimized conditions has allowed the discrimination of five red wines elaborated using the same vinification and ageing methods (vintage 2000) being the only variable modified the variety of grape. The results agree with obtained gas chromatography. These facts demonstrate that the experimental conditions of SPME have to be adapted to the particular requirements of the resistive sensors in order to improve the capability of discrimination of the arrays of sensors.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 120, Issue 1, 14 December 2006, Pages 278–287
نویسندگان
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