Tea Abstract

Abstract—
The present article aims towards the development of a new approach for identification of tea sample by experimentation with electronic tongue and following pulse voltametry method. Six different IS certified tea samples were considered for experimentation using The PCA score of unknown tea sample is undergone through different pair-wise (binary) classification by SVM for fifteen times according to rule (i.e. ½[M[M-1], M being number of categories) for training . The PCA score of unknown sample is then tested with 15 binary SVM-classifiers .The result of classification is a six membership grades. Finally these membership grades are analyzed by decision directed acrylic graph method (DDAG) for decision making task about the exact

PC, microcontroller based system etc.) A potentiostat is used for electrochemical analysis of redox active species and in evaluating thermodynamic and kinetic parameters of electron transfer events. A potentiostat is an electronic instrument capable of imposing electrical potential waveforms across a working electrode relative to a reference electrode. It also measures the resultant current through the cell at the third electrode [2, 5]. In operation, the potentiostat is commonly interfaced to a three-electrode setup containing reference electrode, working electrode and counter electrode. The reference electrode is used for producing a constant reference potential in the electrochemical cell, against which the working electrode potential may be determined with relatively high precision.. Minimal current is drawn through the reference electrode because its current signal is made input to a very-high–impedance electrometer, thus ensuring the constant potential condition .From the surface of the working electrode the electron transfer of interest occurs. Current flowing toward the counter electrode due to electron transfer events is measured The working electrode must be geometrically larger enough so that it does not limit the current density at the working electrode. However the electron transfer events at the counter electrode surface is ignored as they do not

Brookbond, Double-diamond, Godrej, Lipton, Lipton-Darjeeling and Marvel). Three separate stocks of tea liquor of different categories, volume 100mL have been prepared after adding 5 gm tea to 150mL water and boiling for 5 minutes. During experiment, the temperature of tea samples are maintained at 200C and pH values of all tea samples are maintained at 6.0 by adding buffer solution. The experiment were performed each time in a standard three electrodes configuration, containing four working electrodes (e.g. AG, PT, AU and GC ) having 5 mm length and diameter of 1 mm, counter electrode (made of stainless steel) having a dimension of 20x50 mm2, and Ag/AgCl, 3M KCL as reference electrode. The electrodes were immersed into tea liquor contained in 150mL electrochemical cell of potentiostat (make Gammry, Model: G 300). The current response from counter electrode was captured by DAS hardware connected to PC and PHE200 Physical Electrochemistry software package. In pulse voltametry method, the input waveform is formed by potential pulses of varying amplitudes with a base potential in between. Different amplitudes are used to increase the sensitivity and improve the discrimination between samples so that all substances that are electrochemically active below base the applied potential will add to the measured current. The current response from an input