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Agressott EV, Blätte D, Cunha FA, Noronha VT, Ciesielski R, Hartschuh A, Paula AJD, Fechine PB, Souza Filho A, Paschoal AR. Vibrational Spectroscopy and Morphological Studies on Protein-Capped Biosynthesized Silver Nanoparticles. ACS Omega 2020; 5:386-393. [PMID: 31956786 PMCID: PMC6964295 DOI: 10.1021/acsomega.9b02867] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 10/28/2019] [Indexed: 05/26/2023]
Abstract
Silver nanoparticles (AgNPs) have a large number of applications in technology and physical and biological sciences. These nanomaterials can be synthesized by chemical and biological methods. The biological synthesis using fungi represents a green approach for nanomaterial production that has the advantage of biocompatibility. This work studies silver nanoparticles (AgNPs) produced by fungi Rhodotorula glutinis and Rhodotorula mucilaginosa found in ordinary soil of the Universidade Federal do Ceará campus (Brazil). The biosynthesized AgNPs have a protein-capping layer involving a metallic Ag core. The focus of this paper is to investigate the size and structure of the capping layer, how it interacts with the Ag core, and how sensitive the system (core + protein) is to visible light illumination. For this, we employed SEM, AFM, photoluminescence spectroscopy, SERS, and dark-field spectroscopy. The AgNPs were isolated, and SEM measurements showed the average size diameter between 58 nm for R. glutinis and 30 nm for R. mucilaginosa. These values are in agreement with the AFM measurements, which also provided the average size diameter of 85 nm for R. glutinis and 56 nm for R. mucilaginosa as well as additional information about the average size of the protein-capping layers, whose found values were 24 and 21 nm for R. mucilaginosa and R. glutinis nanoparticles, respectively. The protein-capping layer structure seemed to be easily disturbed, and the SERS spectra were unstable. It was possible to identify Raman peaks that might be related to α-helix, β-sheet, and protein mixed structures. Finally, dark-field microscopy showed that the silver cores are very stable, but some are affected by the laser energy due to heating or melting.
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Affiliation(s)
| | - Dominic Blätte
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Francisco Afrânio Cunha
- Grupo de Química de Materiais
Avançados (GQMat), Departamento de Química Analítica
e Físico-Química, Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
- Laboratório
de Microbiologia de Leveduras da Faculdade de Farmácia da Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
| | - Victor T. Noronha
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Richard Ciesielski
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Achim Hartschuh
- Department
of Chemistry and Center for NanoScience (CeNS), LMU Munich, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Amauri Jardim de Paula
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Pierre Basílio
Almeida Fechine
- Grupo de Química de Materiais
Avançados (GQMat), Departamento de Química Analítica
e Físico-Química, Universidade
Federal do Ceara (UFC), Campus do Pici, CEP 60451-970 Fortaleza, CE, Brazil
| | - Antônio
Gomes Souza Filho
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
| | - Alexandre Rocha Paschoal
- Departamento
de Física, Universidade Federal do
Ceará, Campus do Pici, P.O. Box 6030, 65455-900 Fortaleza, CE, Brazil
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