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Smart colloids containing ensembles of gold nanoparticles conjugated with κ-carrageenan.
Gasilova, Ekaterina R; Aleksandrova, Galina P; Volchek, Boris Z; Vlasova, Elena N; Baigildin, Vadim A.
Afiliación
  • Gasilova ER; Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy pr. 31, 199004 St. Petersburg, Russian Federation. Electronic address: gasilova@imc.macro.ru.
  • Aleksandrova GP; A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Division, Russian Academy of Sciences, Favorsky str. 1, 664033 Irkutsk, Russian Federation.
  • Volchek BZ; Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy pr. 31, 199004 St. Petersburg, Russian Federation.
  • Vlasova EN; Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy pr. 31, 199004 St. Petersburg, Russian Federation.
  • Baigildin VA; St. Petersburg State University, University pr. 26, Peterhof, 198504 St. Petersburg, Russian Federation.
Int J Biol Macromol ; 137: 358-365, 2019 Sep 15.
Article en En | MEDLINE | ID: mdl-31260775
We study colloids of nanobiocomposites (NBC) containing Au nanoparticles (NP) obtained by reduction of gold precursor with functional groups of κCAR. The AuNPs content was changed from 2.0 to 5.6 w/w %. Hydrolysis of κCAR during reduction of gold ions produced carboxylate groups supporting nanobioconjugation (FT-IR data) and electrostatic stabilization through increased negative ζ-potential. The self-assembly of AuNPs took place after storing NBC, as shown by UV/vis. extinction and transmission electron microscopy. Analysis of the structure-sensitive Rg/Rh ratios obtained by dynamic and static light scattering showed that the colloids have core-shell structure. The macromolecules in the shell exhibited polyelectrolyte expansion at [NaCl] and [KCl] < 0.02 M. Above 0.02 M, the difference between non-specific sodium and specific potassium ions on the shell thickness was registered. The temperature hysteresis of the hydrodynamic radius Rh was similar to that of the pristine κCAR observed previously by optical rotation. Monitoring the equilibration of light scattering intensity at each mini-quenching step of the cooling run allowed further insight into the hysteresis origin. These colloids are interesting for sensing applications because of enhanced scattering of plasmonically coupled AuNPE. Their thermo- and ion-sensitivity can be useful in drug delivery.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Carragenina / Coloides / Nanopartículas del Metal / Oro Idioma: En Revista: Int J Biol Macromol Año: 2019 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Carragenina / Coloides / Nanopartículas del Metal / Oro Idioma: En Revista: Int J Biol Macromol Año: 2019 Tipo del documento: Article Pais de publicación: Países Bajos