Determination of Rutin in Black Tea by Adsorption Voltammetry (AdV) in the Presence of Morin and Quercetin

Abstract

This paper presents a sensitive method to rutin determination on a screen-printed multi-walled carbon nanotube electrode modified with poly(3,4-ethylenedioxythiophene) and ionic liquid (SMWCNT-PEDOT-IL). Several studies show that rutin may be absorbed onto the surface of electrodes modified with PEDOT. On the other hand, the presence of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF 4 ) on the surface of the modified electrode increased the oxidation current by nearly 30 % and facilitates the oxidation of rutin to values less positive potential compared with the modified electrode only with PEDOT. Cyclic voltammetry was used to quantify and characterize the modified electrode. pH and electrochemical parameters, potential adsorption, time adsorption, and scan rate were optimized based on the oxidation of rutin to obtain the following values: pH 6.0; Eads, −0.10 V; tads, 80 s; and scan rate 50 mV s −1 . The detection limit (3σ) was 7.7 × 10 −8 mol L −1 and the RSD was 1.5 %. The new method was used to quantify rutin in black tea samples in the presence of others flavones with consistent results.

Thermodynamics and Kinetics ofCamellia sinensisExtracts and Constituents: An Untamed Antioxidant Potential

“…Literature reports that C. sinensis extracts showcase anodic peaks at electric potentials bellow 0.5 V when analyzed under voltammetry [17,18,30,31,41], which is nonetheless a remarkable feature. Considering that most of the endogenous antioxidant arsenal operates at electric potentials close to this value, the reductive power of C. sinensis constituents is noteworthy, since they could undergo oxidation thereby stabilizing ROS or restituting endogenous antioxidants [8,10,27,42].…”

Determinación De Morina en Té Verde Y Café Por Voltamperometría De Adsorción Utilizando Electrodos De Carbono Modificados Con Poli (3,4-Etilendioxitiofeno) Y Líquido Iónico

“…Estos resultados indican que la presencia de BMIMBF 4 en la superficie de PEDOT/SPCE favoreció la transferencia de electrones para el sistema Fe 3+ + e -↔ Fe 2+ aunque requiere más energía. Resultados similares fueron reportados previamente usando PEDOT e IL en nanotubos de carbono de pared simple 11 .…”

Selective detection of rutin in the presence of ascorbic acid with a carbon nanotube electrode

“…tablets. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The analysis of orange juice, [16][17][18] black tea 19) and fruit 20) with the intentional addition of rutin is reported. However, it is not a real food sample, but designed food.…”