Highly sensitive and selective electrochemical detection of caffeine, theophylline and guaiacol in green tea, green coffee, coffee, and tea extracts using a SnS₂ nanoflake-modified electrode

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Tin( iv ) sulfide (SnS 2 ) nanoflakes modified glassy carbon electrode was utilized for the electrochemical detection of caffine, theophylline and guaiacol. This study was carried out using commercially available samples of green tea, green coffee, tea and coffee extracts.