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

Lookup NU author(s): Dr Piergiorgio GentileORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2021 The Author(s)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.

Publication metadata

Author(s): Giron-Hernandez J, Gentile P, Benlloch-Tinoco M

Publication type: Article

Publication status: Published

Journal: Carbohydrate Polymers

Year: 2021

Volume: 271

Print publication date: 01/11/2021

Online publication date: 12/07/2021

Acceptance date: 08/07/2021

Date deposited: 05/08/2021

ISSN (print): 0144-8617

ISSN (electronic): 1879-1344

Publisher: Elsevier Ltd


DOI: 10.1016/j.carbpol.2021.118429


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