Impact of heterogeneously crosslinked calcium alginate networks on the encapsulation of β-carotene-loaded beads

Girón-Hernández, Joel, Gentile, Piergiorgio and Benlloch Tinoco, María (2021) Impact of heterogeneously crosslinked calcium alginate networks on the encapsulation of β-carotene-loaded beads. Carbohydrate Polymers, 271. p. 118429. ISSN 0144-8617

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Official URL: https://doi.org/10.1016/j.carbpol.2021.118429

Abstract

This study investigated the impact of heterogeneity of crosslinking on a range of physical and mechanical properties of calcium alginate networks formed via external gelation with 0.25–2% sodium alginate and 2.5 and 5% CaCl2. Crosslinking in films with 1–2% alginate was highly heterogeneous, as indicated by their lower calcium content (35–7 mg Ca·g alginate−1) and apparent solubility (5–6%). Overall, films with 1–2% alginate showed higher resistance (tensile strength = 51–147 MPa) but lower elasticity (Elastic Modulus = 2136–10,079 MPa) than other samples more homogeneous in nature (0.5% alginate, Elastic Modulus = 1918 MPa). Beads with 0.5% alginate prevented the degradation of β-carotene 1.5 times more efficiently than 1% beads (5% CaCl2) at any of the storage temperatures studied. Therefore, it was postulated that calcium alginate networks crosslinked to a greater extent and in a more homogeneous manner showed better mechanical performance and barrier properties for encapsulation applications.

Item Type: Article
Additional Information: Funding information: This study was supported financially by the Global Challenges Research Fund programme from Northumbria University.
Uncontrolled Keywords: Calcium alginate networks, Heterogeneity crosslinking, Encapsulation, Barrier properties, Mechanical properties, β-Carotene
Subjects: C500 Microbiology
C700 Molecular Biology, Biophysics and Biochemistry
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Rachel Branson
Date Deposited: 14 Jul 2021 14:47
Last Modified: 19 Jul 2021 15:00
URI: http://nrl.northumbria.ac.uk/id/eprint/46678

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