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Vetterlein C, Vásquez R, Bolaños K, Acosta GA, Guzman F, Albericio F, Celis F, Campos M, Kogan MJ, Araya E. Exploring the influence of Diels-Alder linker length on photothermal molecule release from gold nanorods. Colloids Surf B Biointerfaces 2018; 166:323-329. [PMID: 29625410 DOI: 10.1016/j.colsurfb.2018.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 02/01/2018] [Accepted: 03/17/2018] [Indexed: 11/30/2022]
Abstract
We studied the photothermal release of carboxyfluorescein (CF) linked to the gold surface of gold nanorods (GNRs) by two Diels-Alder adducts of different lengths (n = 4 and n = 9). The functionalized GNRs were irradiated with infrared light to produce photothermal release of CF by a retro-Diels-Alder reaction. The adducts were chemisorbed on the GNRs and the functionalized nanoparticles were characterized by UV-vis, DLS, zeta potential and Raman and surface-enhanced Raman spectroscopy (SERS). On the basis of the degree of nanoparticle functionalization and the SERS results, we inferred the orientation of CF on the surface of the gold nanoparticle. Moreover, we determined the photothermal release profiles of CF from the gold surface by laser irradiation. The release was faster for the longer linker (n = 9). SERS revealed that, for the shorter linker (n = 4), molecules are oriented perpendicularly with respect to the gold surface, thereby maintaining the CF far from the surface. In contrast, the longer linker was observed to be tilted, thus maintaining CF close to the gold surface and therefore potentially favoring the photothermal transfer of energy. These results are relevant for the future development of the spatial and temporal controlled release of drugs by means of gold nanoparticles.
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Affiliation(s)
- Claudia Vetterlein
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago, Chile; Advanced Center for Chronic Diseases (ACCDiS), Santos Dumont 964, Independencia, Santiago, Chile
| | - Rodrigo Vásquez
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago, Chile; Advanced Center for Chronic Diseases (ACCDiS), Santos Dumont 964, Independencia, Santiago, Chile; Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile
| | - Karen Bolaños
- Advanced Center for Chronic Diseases (ACCDiS), Santos Dumont 964, Independencia, Santiago, Chile; Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile
| | - Gerardo A Acosta
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Scientific Park, Baldiri Reixac 10, Barcelona 08028, Spain; Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1-11, Barcelona 08028, Spain
| | - Fanny Guzman
- Núcleo de Biotecnología Curauma, Pontificia Universidad Católica de Valparaiso, Av Universidad 330 Curauma, Valparaiso, Chile
| | - Fernando Albericio
- CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Scientific Park, Baldiri Reixac 10, Barcelona 08028, Spain; Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1-11, Barcelona 08028, Spain; School of Chemistry & Physics, University of Kwazulu-Natal, Durban 4001, South Africa
| | - Freddy Celis
- Departamento de Química y Centro de Estudios Avanzados, Universidad de Playa Ancha, Casilla 34-V, Valparaíso, Chile
| | - Marcelo Campos
- Department of Chemistry, Faculty of Sciences, University of Chile, POBox 653, Santiago, Chile
| | - Marcelo J Kogan
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago, Chile; Advanced Center for Chronic Diseases (ACCDiS), Santos Dumont 964, Independencia, Santiago, Chile.
| | - Eyleen Araya
- Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile.
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