The performance of cathodically pretreated boron-doped diamond electrode in cationic surfactant media for enhancing the adsorptive stripping voltammetric determination of catechol-containing flavonoid quercetin in apple juice.
Talanta
; 187: 156-164, 2018 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-29853029
ABSTRACT
In the present paper, an electroanalytical methodology was developed for the determination of an important catechol-containing flavonoid derivative, quercetin using adsorptive stripping voltammetry at a cathodically pretreated boron-doped diamond electrode. In cyclic voltammetry, the compound showed a couple of oxidation/reduction peak at low positive potentials, and additional two oxidation peaks at more positive potentials. The sensitivity of the stripping voltammetric measurements was significantly improved when the cationic surfactant, cetyltrimethylammonium bromide (CTAB) was present in the electrolyte solution. Using square-wave stripping mode, a highly linear analytical curve was obtained for quercetin determination in 0.1â¯M acetate buffer solution (pH 4.7) containing 3â¯×â¯10-4 M CTAB at +â¯0.37â¯V (vs. Ag/AgCl) (after 30â¯s accumulation at open-circuit condition) in the range of 0.5-200â¯ngâ¯mL-1 (1.7â¯×â¯10-9-3.3â¯×â¯10-7 M), with a detection limit of 0.132â¯ngâ¯mL-1 (4.4â¯×â¯10-10 M). As an example, the practical applicability of proposed method was successfully tested with the measurement of quercetin concentration in commercial apple juice samples.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Quercetina
/
Tensoativos
/
Boro
/
Catecóis
/
Técnicas Eletroquímicas
/
Sucos de Frutas e Vegetais
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article