Determination of pentahydroxyflavones using coated chitosan multi-wall carbon nanotubes and an ionic liquid glassy carbon electrode by adsorption stripping voltammetry (AdSV)

• Morin could be determined in real samples.
• Ionic liquids improved sensitivity.
• The modified electrode showed good reproducibility.
• Metal ions such as Pb and Cd did not produce significant interference.
• The presence of quinones produced considerable interference.

In this work, the determination of pentahydroxyflavones on a glassy carbon electrode modified with chitosan and multi-walled carbon nanotubes (Ch–MWCNT) was studied. The presence of ionic liquids (LIs) on the surface of the modified electrode (Ch–MWCNT–LI–GCE) increased the oxidation current by nearly 20%. The pH and electrochemical parameters (adsorptive potential and time accumulation) were optimized based on the oxidation of morin to obtain the following values: pH, 3.2; Eads, − 0.10 V; and tads, 70 s. The detection limit was 0.54 × 10− 7 mol L− 1 and the RSD was 1.7%. The new method was used to quantify pentahydroxyflavones in plant tissue samples.

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