| Full text | |
| Author(s): |
Sarto, Gabrielle
;
Cervantes, Thiago N. M.
;
Slonski, Maiara M.
;
V. Martins, Joao
;
Soto, Pablo C.
;
de Santana, Henrique
;
de Almeida, Lucio C.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | VIBRATIONAL SPECTROSCOPY; v. 134, p. 12-pg., 2024-07-14. |
| Abstract | |
The synthesis of TiO2 nanotubes film decorated with Ag nanoparticles (TiO2NTs/AgNPs) and its potential applicability as a SERRS (Surface-Enhanced Raman Resonance Scattering) substrate for detection and speciation of anthocyanins species in grape skin extracts is reported. Preliminary spectrophotometric analysis in the UV-Vis region allowed to identify the maximum absorption bands at 527 and 620 nm, related to the flavylium cation (AH+) and quinoidal base (A-), respectively. The increase in the ratio AgNPs/extract concentration in colloidal solutions of AgNPs promoted the intensification of the vibrational modes of anthocyanins species, due to the SERRS effect. From deconvolutions of these SERRS spectra, a linear relationship (R2 = 0.993) for the intensity ratio of the vibrational modes A-/AH+ (i.e., for the ratio 1631-1640/1648-1659 cm-1) as a function of the grape skin extract dilutions at colloidal solutions of AgNPs was found. The deposition of the extracts onto TiO2NTs/ AgNPs surface promoted an additional SERRS signal intensification for A- in detriment to AH+. The deconvolution of these SERRS spectra showed again a linear relationship (R2 = 0.999) between the intensity bands ratio A-/AH+ and grape skin extract dilutions in the range of 0.1-1.0 %. The SERRS technique using the TiO2NTs/ AgNPs substrate was more sensitive for anthocyanins quantification compared to the spectrophotometric one. The results revealed that the TiO2NTs/AgNPs films are versatile, efficient, and promising platforms for SERRS quantification and speciation of anthocyanin species in situ. (AU) | |
| FAPESP's process: | 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies |
| Grantee: | Maria Valnice Boldrin |
| Support Opportunities: | Research Projects - Thematic Grants |