| Full text | |
| Author(s): |
Inoque, Neilio
;
Araujo, Diele A. G.
;
de Lima, Debora Machado
;
Sousa, Raquel Maria Ferreira
;
Paixao, Thiago Regis Longo Cesar
;
Munoz, Rodrigo A. A.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | ACS FOOD SCIENCE & TECHNOLOGY; v. 4, n. 6, p. 9-pg., 2024-06-04. |
| Abstract | |
This paper describes a new analytical method based on laser-induced graphene (LIG) electrodes for evaluating antioxidant capacity in tea by quantifying the consumption of the 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical. The LIG electrodes were produced by pyrolysis using a CO2 infrared laser source (10 electrodes were produced in 5 min). The LIG sensor was coupled to a three-dimensional (3D)-printed batch-injection analysis cell to amperometrically detect the remaining DPPH. The sensing properties included a linear range from 2 to 900 mu mol L-1 (R-2 > 0.99), adequate limit of detection (LOD = 0.6 mu mol L-1), fast responses (similar to 10 s), and good precision relative standard deviation (RSD < 4.0%). The efficient concentration of tea samples necessary to reduce the initial DPPH concentration by 50% (EC50) was determined after incubation with DPPH radicals for 30 min. The results of EC50 showed good agreement with the conventional spectrophotometric results. Therefore, LIG electrodes are a powerful analytical tool for applications in teas. (AU) | |
| FAPESP's process: | 22/01810-5 - 3D-PRINTING AND TEXTILE THREADS-BASED MICROFLUIDIC PLATFORMS FOR ELECTROANALYSIS OF CLINICAL, ENVIRONMENTAL AND BIOLOGICAL SAMPLES |
| Grantee: | Diele Aparecida Gouveia Araújo |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications |
| Grantee: | Mauro Bertotti |
| Support Opportunities: | Research Projects - Thematic Grants |