Loading Capacity versus Enzyme Activity in Anisotropic and Spherical Calcium Carbonate Microparticles

Senem Donatan, Alexey Yashchenok, Nazimuddin Khan, Bogdan Parakhonskiy, Melissa Cocquyt, Bat El Pinchasik, Dmitry Khalenkow, Helmuth Möhwald, Manfred Konrad, Andre Skirtach

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

A new method of fabrication of calcium carbonate microparticles of ellipsoidal, rhomboidal, and spherical geometries is reported by adjusting the relative concentration ratios of the initial salt solutions and/or the ethylene glycol content in the reaction medium. Morphology, porosity, crystallinity, and loading capacity of synthesized CaCO3 templates were characterized in detail. Particles harboring dextran or the enzyme guanylate kinase were obtained through encapsulation of these macromolecules using the layer-by-layer assembly technique to deposit positively and negatively charged polymers on these differently shaped CaCO3 templates and were characterized by confocal laser scanning fluorescence microscopy, fluorometric techniques, and enzyme activity measurements. The enzymatic activity, an important application of such porous particles and containers, has been analyzed in comparison with the loading capacity and geometry. Our results reveal that the particles' shape influences morphology of particles and that, as a result, affects the activity of the encapsulated enzymes, in addition to the earlier reported influence on cellular uptake. These particles are promising candidates for efficient drug delivery due to their relatively high loading capacity, biocompatibility, and easy fabrication and handling.

Original languageEnglish
Pages (from-to)14284-14292
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number22
DOIs
Publication statusPublished - 8 Jun 2016
Externally publishedYes

Keywords

  • calcium carbonate
  • enzyme
  • enzyme-catalyzed reaction
  • polyelectrolyte
  • vaterite

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