Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)
Abstract
:1. Introduction
2. Experimental Section
2.1. General Information
2.2. Synthesis of Ag Nanoparticles
2.2.1. Ag Nanostars (AgNSs)
2.2.2. Ag Nanospheres (AgNPs)
2.2.3. Ag Nanoplates (AgNPLs)
2.3. SERS Measurements
2.4. Data Analysis—Multidimensional Projections
2.5. Electrochemical Measurements
3. Results and Discussion
3.1. Characterization of the Ag Nanoparticles: AgNS, AgNP and AgNPL
3.2. SERS Measurements for Detecting L-Dopa
3.3. Multidimensional Projections
3.4. Effect of Nanoparticles Shape on Electrochemical Oxidation of L-Dopa
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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AgNS + L-Dopa (cm−1) | AgNP + L-Dopa (cm−1) | AgNPL + L-Dopa (cm−1) | Assignments | Ref. |
---|---|---|---|---|
- | - | 167 | C-C-C in-plane bending; C-C-N stretching | [73] |
929 | - | 930 | C-C stretching of L-Dopa ring; C-C stretching | [73] |
1160 | - | - | C-H in-plane bending; C-C stretching of Dopa ring; O-H out-of-plane bending | [73,74] |
1160 | 1154 | 1169 | C-H in-plane bending; C-C stretching of L-Dopa ring; O-H out-of-plane bending | [73,74] |
- | - | 1257 | C-N-H and C-C-H in-plane bending; C-C stretching of L-Dopa ring | [73,75] |
- | 1296 | - | C-C stretching of L-Dopa ring; C-C-H in-plane bending | [73] |
- | 1355 | - | C-C stretching of L-Dopa ring; O-H out-of-plane bending | [73,75,76] |
- | - | 1534 | C-H in-plane bending and C-C stretching of L-Dopa ring | [73] |
- | - | 1589 | C-C stretching and C-H in-plane bending of L-Dopa ring | [73,75] |
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Rubira, R.J.G.; Camacho, S.A.; Martin, C.S.; Mejía-Salazar, J.R.; Reyes Gómez, F.; da Silva, R.R.; Oliveira Junior, O.N.d.; Alessio, P.; Constantino, C.J.L. Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS). Sensors 2020, 20, 15. https://doi.org/10.3390/s20010015
Rubira RJG, Camacho SA, Martin CS, Mejía-Salazar JR, Reyes Gómez F, da Silva RR, Oliveira Junior ONd, Alessio P, Constantino CJL. Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS). Sensors. 2020; 20(1):15. https://doi.org/10.3390/s20010015
Chicago/Turabian StyleRubira, Rafael Jesus Gonçalves, Sabrina Alessio Camacho, Cibely Silva Martin, Jorge Ricardo Mejía-Salazar, Faustino Reyes Gómez, Robson Rosa da Silva, Osvaldo Novais de Oliveira Junior, Priscila Alessio, and Carlos José Leopoldo Constantino. 2020. "Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)" Sensors 20, no. 1: 15. https://doi.org/10.3390/s20010015