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Rheological Behavior of Pectin Gels Obtained from Araçá (Psidium cattleianum Sabine) Fruits: Influence of DM, Pectin and Calcium Concentrations.
Amaral, Sarah da Costa; Roux, Denis Christophe D; Caton, François; Rinaudo, Marguerite; Barbieri, Shayla Fernanda; Silveira, Joana Léa Meira.
Afiliação
  • Amaral SDC; Postgraduate Program in Biochemical Sciences, Sector of Biological Sciences, Federal University of Paraná, Curitiba 81531-980, Brazil.
  • Roux DCD; University Grenoble Alpes, CNRS, Grenoble INP, LRP, 38000 Grenoble, France.
  • Caton F; University Grenoble Alpes, CNRS, Grenoble INP, LRP, 38000 Grenoble, France.
  • Rinaudo M; University Grenoble Alpes, CNRS, Grenoble INP, LRP, 38000 Grenoble, France.
  • Barbieri SF; Biomaterials Applications, 6 Rue Lesdiguières, 38000 Grenoble, France.
  • Silveira JLM; Postgraduate Program in Biochemical Sciences, Sector of Biological Sciences, Federal University of Paraná, Curitiba 81531-980, Brazil.
Polymers (Basel) ; 14(16)2022 Aug 12.
Article em En | MEDLINE | ID: mdl-36015541
In this work, purified pectins from Araçá fruits (Psidium cattleianum Sabine) were obtained and characterized after partial demethylation. On each prepared sample, the carboxylic yield was obtained by titration, the degree of methylation (DM) by 1H-NMR, and the molecular weight distribution by steric exclusion chromatography (SEC). Then, the gelation ability in the presence of calcium counterions was investigated and related to DM (59-0%); the pectin concentration (2-10 g L-1); and the CaCl2 concentration (0.1-1 mol L-1) used for dialysis. The critical pectin concentration for homogeneous gelation was above 2 g L-1 when formed against 1 mol L-1 CaCl2. The elastic modulus (G') increased with pectin concentration following the relationship G'~C2.8 in agreement with rigid physical gel network predictions. The purified samples APP and APP-A with DM ≥ 40% in the same conditions released heterogeneous systems formed of large aggregates. Gels formed against lower concentrations of CaCl2 down to 0.1 mol L-1 had a higher degree of swelling, indicating electrostatic repulsions between charged chains, thus, counterbalancing the Ca2+ cross-linkage. Compression/traction experiments demonstrated that an irreversible change in the gel structure occurred during small compression with an enhancement of the G' modulus.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Polymers (Basel) Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Polymers (Basel) Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça