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Abstract: In this work, we report a facile and convenient approach for the synthesis of a molecular imprinted electrode for detecting total theaflavin (TF), an important chemical constituent of black tea. The proposed electrode is prepared from co-polymer of acrylamide and divinylbenzene along with graphite and it is imprinted with TF. The molecular imprinted polymer (MIP) is characterized by fourier transform infra-red (FTIR) and field emission scanning electron microscope (FESEM) techniques. Cyclic voltammetric and differential pulse voltammetry analysis were performed in order to study the performance of the electrode. The MIP electrode is found to have a good detection limit of 14 μM (S/N = 3) and a linear range of 20-100 μM. The electrode also showed an excellent selectivity and sensitivity to TF from its structural analogues. The analytical performance of the MIP electrode has been observed to be reasonably good and has adequate repeatability and reproducibility. The proposed electrode is employed to determine the TF content in black tea samples by correlating with HPLC data using partial least square regression technique and a prediction accuracy of 94% is obtained
Template and target information: theaflavin, TF
Author keywords: molecularly imprinted polymer, Total theaflavin, voltammetry, tea, Partial least square technique