Smart colloids containing ensembles of gold nanoparticles conjugated with kappa-carrageenan

Ekaterina R. Gasilova, Galina P. Aleksandrova, Boris Z. Volchek, Elena N. Vlasova, Vadim A. Baigildin

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

3 Цитирования (Scopus)

Аннотация

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 R g/R h 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 R h 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.

Язык оригиналаанглийский
Страницы (с-по)358-365
Число страниц8
ЖурналInternational Journal of Biological Macromolecules
Том137
Ранняя дата в режиме онлайн28 июн 2019
DOI
СостояниеОпубликовано - 2019

Предметные области Scopus

  • Энергия (все)
  • Экономика и эконометрия
  • Молекулярная биология
  • Структурная биология
  • Биохимия

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