Abstract
Twelve different orthodox Indian tea samples were collected from tea growing and processing sites of Kangra (Valley), India. The percentage of major chemical constituents responsible for the tea quality has been determined by HPLC and UV-vis spectrophotometer. Impedance response using Platinum (Pt), Gold (Au), Silver (Ag), Glassy Carbon (GC), Polyaniline (PANI) (emraldine salt) and Poly Pyrrole (PPY) working electrodes in tea infusions in the frequency range of 1 Hz to 100 kHz has been measured for 30 days on each tea sample. The impedance response of these working electrodes along with the determined chemical concentrations was subjected to Principal Component Analysis (PCA). It was possible to map the antioxidant levels in these tea samples with few exceptions from the score plot of PCA.
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