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

Joel Giron-Hernandez, Piergiorgio Gentile, Maria Benlloch Tinoco*

*Corresponding author for this work

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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.
Original languageEnglish
Article number118429
Number of pages8
JournalCarbohydrate Polymers
Volume271
Early online date12 Jul 2021
DOIs
Publication statusE-pub ahead of print - 12 Jul 2021

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