Volume 53, Issue 4 pp. 531-539
RESEARCH ARTICLE

Mechanical properties of gellan gum beads prepared with potassium or calcium ions

Joice Aline Pires Vilela

Corresponding Author

Joice Aline Pires Vilela

Department of Food Engineering and Technology, School of Food Engineering, University of Campinas (UNICAMP), Campinas, Brazil

Correspondence

Joice Aline Pires Vilela, Department of Food Engineering and Technology, School of Food Engineering, University of Campinas (UNICAMP), Campinas, SP 13083-862, Brazil.

Email: [email protected]

Contribution: Conceptualization (equal), Formal analysis (lead), ​Investigation (lead), Visualization (lead), Writing - original draft (lead)

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Fabiana Perrechil Bonsanto

Fabiana Perrechil Bonsanto

Department of Chemical Engineering, Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), Diadema, Brazil

Contribution: Conceptualization (equal), Methodology (lead), Supervision (supporting), Writing - review & editing (supporting)

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Rosiane Lopes Cunha

Rosiane Lopes Cunha

Department of Food Engineering and Technology, School of Food Engineering, University of Campinas (UNICAMP), Campinas, Brazil

Contribution: Conceptualization (equal), Funding acquisition (lead), Project administration (lead), Supervision (lead), Writing - review & editing (lead)

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First published: 15 April 2022
Citations: 6

This article was published on AA publication on: 15 April, 2022.

Funding information: Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant/Award Numbers: 131179/2010-1, 307168/2016-6; Fundação de Amparo à Pesquisa do Estado de São Paulo, Grant/Award Number: EMU 09/541371

Abstract

Biopolymer beads can be used as carrier and encapsulation system for a wide variety of materials in food, medical, pharmaceutical, cosmetics, agricultural, and environmental applications. Beads of low acyl gellan gum (0.4–1.2% w/w) were produced using extrusion technique (dripping) followed by an ionotropic gelation step with calcium or potassium chloride. In this methodology, gel formation is accomplished by cations diffusion at room temperature and, as a consequence, different structure and gel properties could be obtained. Gellan beads were subjected to uniaxial compression measurements. The force-displacement curves showed that the occurrence of structural failure under tested conditions depended on beads formulation and was only observed at polysaccharide concentration above 0.8% (w/w). Maximum force or force at failure was mainly dependent on the type (monovalent or divalent cation) and salt concentration. Moreover, at fixed salt amounts, higher values of maximum force were reached using a concentration of 1% (w/w) gellan. Young modulus, determined using Hertz approach, showed values between 445 and 840 kPa depending on polysaccharide concentration and salt type added. Mechanical properties are critical features of gel beads and can define their suitability for a specific application. Therefore, the results obtained, mainly intrinsic properties such as Young modulus, could be a tool for comparing and choosing polysaccharides for specific uses.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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