Colloidal nanoparticles of sodium polygalacturonate prepared by nanoprecipitation.
Carbohydr Polym
; 291: 119521, 2022 Sep 01.
Article
en En
| MEDLINE
| ID: mdl-35698365
Polygalacturonic acid (PGA), being the backbone of pectins, governs their aggregation that is widely applied in industry. The PGA aggregation was studied by dynamic and static light scattering within a limited space of sodium polygalacturonate nanoparticles obtained by nanoprecipitation (drop-wise addition of alkaline solution of PGA to an ethanol bath). With increasing buffer's pH from 4.0 to 9.1, the colloids changed their form from elongated to spherical one, as indicated by decreasing the structure-sensitive ratio Rg/Rh from 1.7 to 1.1. Molecular mass-per-unit-length determined in Holtzer coordinates decreased from 5000 to 1600 Da nm-1 with increasing pH, suggesting partial disintegration of helical bundles due to electrostatic repulsion. Kratky plots also pointed out partial disintegration of the PGA junctions with increasing pH. Nonmonotonic dependence of the colloidal radius of gyration Rg on [NaCl] characterized the osmotic regime characteristic of annealed polyelectrolytes and thus confirmed the star-like structure of junctions.
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Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Nanopartículas
Idioma:
En
Revista:
Carbohydr Polym
Año:
2022
Tipo del documento:
Article
Pais de publicación:
Reino Unido