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J Colloid Interface Sci. 2015 Jun 15;448:79-87. doi: 10.1016/j.jcis.2015.01.091. Epub 2015 Feb 9.

Highly efficient, long life, reusable and robust photosynthetic hybrid core-shell beads for the sustainable production of high value compounds.

Author information

1
Laboratory of Inorganic Materials Chemistry, University of Namur, rue de Bruxelles, 61, Namur B-5000, Belgium.
2
University of Mons, rue de l'Epargne, 56, Mons B-7000, Belgium.
3
University of Liège, B6c, Allée de la chimie, 3, Sart-Tilman B-4000, Belgium.
4
Laboratory of Inorganic Materials Chemistry, University of Namur, rue de Bruxelles, 61, Namur B-5000, Belgium. Electronic address: joanna.rooke@unamur.be.
5
Laboratory of Inorganic Materials Chemistry, University of Namur, rue de Bruxelles, 61, Namur B-5000, Belgium. Electronic address: bao-lian.su@unamur.be.

Abstract

An efficient one-step process to synthesize highly porous (Ca-alginate-SiO2-polycation) shell: (Na-alginate-SiO2) core hybrid beads for cell encapsulation, yielding a reusable long-life photosynthetically active material for a sustainable manufacture of high-value metabolites is presented. Bead formation is based on crosslinking of an alginate biopolymer and mineralisation of silicic acid in combination with a coacervation process between a polycation and the silica sol, forming a semi-permeable external membrane. The excellent mechanical strength and durability of the monodispersed beads and the control of their porosity and textural properties is achieved by tailoring the silica and alginate loading, polycation concentration and incubation time during coacervation. This process has led to the formation of a remarkably robust hybrid material that confers exceptional protection to live cells against sheer stresses and contamination in a diverse range of applications. Dunaliella tertiolecta encapsulated within this hybrid core-shell system display high photosynthetic activity over a long duration (>1 year). This sustainable biotechnology could find use in high value chemical harvests and biofuel cells to photosynthetic solar cells (energy transformation, electricity production, water splitting technologies). Furthermore the material can be engineered into various forms from spheres to variable thickness films, broadening its potential applications.

KEYWORDS:

Alginate–silica; Coacervation process; Core–shell beads; Organic–inorganic hybrid composites; Photobioreactor; Polycation

PMID:
25721859
DOI:
10.1016/j.jcis.2015.01.091
[Indexed for MEDLINE]

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