The Identification On The Wines From Geographic Origin Of Changli Using Multi-Frequency Amplitude Pulse Electronic Tongue

The style of the wine is closely related to the ecological conditions of the variety and producing area, the grape chemical component of composition different from producing area, and the different enology of different factory has aggravated the chemical composition difference. Wine have many kinds of styles because a large number of different varieties, and plant under many kinds of soil and climatic conditions. The chemical composition in the wine can be compared to a complicated "black case " system, only analyze the single one, a small amount or several kinds of highest chemical composition, can not really reflect the characteristic of this wine. Any kind of chemical composition can't reflect the whole characteristic of the wine, and the more imperceptible the one that analyzed is, the farther the distance from its whole characteristic is. So, the research of the wine characteristic should not merely include analyze the chemical component of composition, but should also include the study on whole characteristic of wine.In this paper, a novel electronic tongue,multi-frequency amplitude pulse electronic tongue (MFP-ET) was used to detect the different dry red wine produce in ChangLi origin area : produced in different year ,with different producer and different variety. By the detection of MFP-ET, we get the generality of the ChangLi origin red wine, and can set up the electronic tongue fingerprint of ChangLi origin red wine. in this way, we can find a lower expenses differentiation method which is more convenient and more science reliable. It not only can provide scientific basis of china origin wine protection, but also can offer a new technological method for appraising and measuring and analyzing in whole characteristic of the wine.In this study different wine (produced in different year ,with different producer and different variety) were discriminated with MFP-ET through a sensor array of platinum, gold, silver , titanium, palladium, cadmium, aluminum and cuprum electrodes under the mentioned three frequency segments of 1 Hz, 10 Hz and 100 Hz. Principal component analysis was used to process the data. The results showed that the wine could be successfully discriminated by combining together gold electrode in 10 Hz, silver electrode in 100 Hz, cadmium electrode in 1 Hz and titanium electrode in 100 Hz.MFP-ET based on selecting the appropriate sensor array composed of the different non-modified metal electrodes and combining together the different frequency segments of multifrequency large amplitude pulse voltammetry, showed a promising application in qualitative and quantitative analysis of wine.