Bekasova OD, Stein-Margolina VA, Kurganov BI. Ag
0 Nanoparticles Synthesized in R-phycoerythrin: Change in Bioconjugate Properties upon Ripening of Nanoparticles.
Curr Pharm Biotechnol 2018;
19:422-427. [PMID:
29866004 DOI:
10.2174/1389201019666180604103203]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 04/05/2018] [Revised: 05/23/2018] [Accepted: 05/28/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND
Bioconjugates prepared from photoactive molecules and metal nanoparticles are suitable for the development of new optoelectronic devices and for theranostic applications in medicine.
METHODS
We produced a bioconjugate of R-phycoerythrin (R-PE), a photosynthetic pigment of red algae, with Ag0 nanoparticles (Ag0 NPs) synthesized in its tunnel cavities by mixing aqueous solutions of AgNO3 and R-PE without exogenous reductant. In freshly prepared bioconjugate (Ag0⋅R-PE), the diameter of Ag0 NPs measured in electron microscopic images was 6.5 ± 0.5 nm, being commensurate with the length of R-PE tunnel cavity, and they were found to emit bright visible fluorescence.
RESULT
The initial aggregation temperature (T0) of freshly prepared Ag0⋅R-PE was decreased, compared to that of native R-PE (33 vs. 44°C). Upon the ripening of Ag0 NPs, their fluorescence was almost entirely quenched, and giant surface-enhanced Raman scattering was recorded. The bioconjugate self-assembled into nanorods 25 ± 5 nm long and could withstand heating to 90°C. Further heating (90°C → 100°C) resulted in the formation of filaments which are 0.5 ± 0.2 μm long and spherical aggregates 60 ± 10 nm in diameter.
CONCLUSION
These data can contribute to the development of practical applications for the Ag0⋅R-PE bioconjugate.
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