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RESEARCH PRODUCT
Screening and authentication of tea varieties based on microextraction-assisted voltammetry of microparticles
Antonio Doménech-carbóIrene Domínguezsubject
Detection limitChromatographyChemistryMetals and Alloysfood and beveragesCondensed Matter Physicscomplex mixturesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsMaterials ChemistryHerbal preparationsElectrical and Electronic EngineeringInstrumentationVoltammetrydescription
Abstract A simple electrochemical methodology for screening and authentication of green, black and red tea varieties is proposed. It is based on the record of the voltammetric response of microparticulate films of antioxidant compounds resulting from an ethanolic micro-extraction of commercial tea herbal preparations in contact with aqueous buffers. The obtained voltammetric responses led us to differentiate between diverse tea varieties upon application of bivariant and multivariant chemometric techniques, including discrimination of mixtures of teas with sensitivity estimated of 5.0 μA mg −1 with a detection limit of 0.01 mg of tea sample. Under the proposed conditions 100% discrimination rate was achieved for binary mixtures of teas between 10:1 and 1:10 w/w composition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-04-01 | Sensors and Actuators B: Chemical |