Oxidation of Ascorbic Acid by Rutin at a Glassy Carbon Electrode Modified with Lipid Films

Determination of the absolute redox potential of Rutin: Experimental and theoretical studies

“…Previous studies indicate that the response of the Rutin film is pH dependent, and the cyclic voltammograms of Rutin in different pH phosphate buffer contain a single pair of oxidation-reduction peaks, which correspond to the oxidation of 3′, 4′-dihydroxy substituent on the ortho-ring of Rutin and the reduction of the 3′, 4′-diquinone respectively [18]. It was recently reported that the electrochemical behaviour of a Rutin film deposited at the MWCNT modified GCE is reversible, [17] while the Rutin film deposited at the GCE has shown quasireversible behaviour [28]. In the present work, in order to determine the exact conditional formal potential (E°′) of Rutin, the electrochemical behaviour of RMWCNT modified GCE was investigated in different pH buffered solutions.…”

Catechol‐Based Biomimetic Functional Materials

“…Different mechanisms to attach redox mediators to electrode surfaces have been tried so far, among which direct adsorption464, 465 or covalent binding466–468 of monolayers of the redox mediator, in situ electropolymerization,469, 470 immobilization in a pre‐cast lipidic film,471, 472 direct mix in a carbon paste,473 and deposition of a polymer bearing redox moieties 474. Examples of catecholic compounds explored as suitable redox shuttles include pyrocatechol,475–478 3,4‐dihydroxybenzaldehyde,479 3,4‐dihydroxybenzylamine,480, 481 dopamine,467, 468, 471, 481, 482 norepinephrine,472, 481 L‐DOPA,483 serotonin,484 several arylalkylcatechols,464, 465 chlorogenic acid,485 caffeic acid,486 nordihydroguaiaretic acid,487 pyrocatechol violet,488 lignosulfonic acid,489 and catecholic flavonoids, such as rutin490 and quercetin 468, 491. A recent study by Bartlett and co‐workers on the reversible catalytic oxidation of NADH systematically screened 13 different dihydroxybenzene derivatives covalently linked to GCEs by means of two different spacers, showing how the substitution pattern of the aryl ring affects both the redox potential and the surface coverage of the electrode 492.…”

“…A recent study by Bartlett and co‐workers on the reversible catalytic oxidation of NADH systematically screened 13 different dihydroxybenzene derivatives covalently linked to GCEs by means of two different spacers, showing how the substitution pattern of the aryl ring affects both the redox potential and the surface coverage of the electrode 492. As far as the final analyte is concerned, NADH has been studied preferentially, although other redox active species have been successfully detected with catechol‐based electrochemical sensors, such as ascorbic acid,472, 490 phenylalanine,473 dopamine468, 481 and captopril 493. Finally, although much work has been done on the modification of glassy carbon, graphite and metal electrodes with catecholic species, more recent work has explored the use of carbon nanotubes for the encapsulation of such materials for the detection of dopamine,491 redox‐sensitive drugs,493 the electrocatalyzed oxidation of hydrazine,478 and the catalyzed oxidation of NADH 484, 494.…”

Preparation and electrochemical application of rutin biosensor for differential pulse voltammetric determination of NADH in the presence of acetaminophen

“…The electrochemical behavior of rutin, 26,27 the preparation of a few rutin modified electrodes and the investigation of their electrocatalytic effect for some important species [28][29][30][31] were reported. Rutin, as a biological important molecule, is a derivative of catechol and has the basic structure of many natural products with physiological activities.…”