| Full text | |
| Author(s): |
de Castro Viana Pereira, Elaine Renata
[1]
;
Bessegato, Guilherme Garcia
[1]
;
Yamanaka, Hideko
[1]
;
Boldrin Zanoni, Maria Valnice
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Estadual Paulista, UNESP, Inst Chem, Dept Analyt Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Analytical Letters; v. 49, n. 9, p. 1398-1411, 2016. |
| Web of Science Citations: | 4 |
| Abstract | |
Poly-L-lysine incorporated in the nanocavities of polysiloxane-poly(propylene) oxide is reported as an electrochemical sensor for quercetin. A glassy carbon electrode coated by poly-L-lysine/polysiloxane-poly(propylene) oxide accumulated quercetin through hydrogen bonding in pH 2 ethanol/Britton-Robinson buffer. The catecol oxidation was monitored at 0.45V as a reversible two electron peak. The voltammetric response using the film electrode was 80% higher compared to a bare electrode. Square wave voltammetry was employed using an accumulation time of 8min and a linear relationship was obtained for concentrations of quercetin from 1.0x10(-8)mol L-1 to 1.0x10(-6)mol L-1. The limit of detection was 2.76 +/- 0.5x10(-9)mol L-1. The method was employed to determine quercetin in green tea, but did not show selectivity to catechin, which was oxidized at a similar potential. The measurements were validated by high-performance liquid chromatography. (AU) | |
| FAPESP's process: | 12/18357-0 - Study of photoeletrocatalytic degradation of cosmetic dyes with TiO2 nanotube electrodes undoped and doped Sb2S3 |
| Grantee: | Guilherme Garcia Bessegato |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 08/10449-7 - Assessment of occurrence, toxicity/genotoxicity and degradation processes of dyes in effluents and surface water |
| Grantee: | Maria Valnice Boldrin |
| Support Opportunities: | Research Projects - Thematic Grants |