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Tensile and water vapour properties of calcium‐crosslinked alginate‐cashew tree gum films
Author(s) -
Azeredo Henriette M. C.,
Magalhães Ulysses S.,
Oliveira Samira A.,
Ribeiro Hálisson L.,
Brito Edy S.,
De Moura Márcia R.
Publication year - 2012
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2011.02897.x
Subject(s) - ultimate tensile strength , immersion (mathematics) , materials science , composite material , solubility , young's modulus , calcium , sodium alginate , sodium , composite number , aqueous solution , chemical engineering , chemistry , organic chemistry , metallurgy , mathematics , pure mathematics , engineering
Summary In this study, sodium alginate films were blended with cashew tree gum (CTG) and immersed in CaCl 2 solution. The influence of CTG concentration and immersion time in CaCl 2 on tensile properties, water vapour permeability and water solubility (WS) of alginate films was evaluated. Glycerol‐plasticized alginate/CTG films were cast on glass plates, which were then immersed in a 2% CaCl 2 solution to crosslink alginate. CTG concentration in the film solution and immersion time in CaCl 2 bath were varied according to a central composite design. Tensile strength, Young′s modulus, WS and water vapour barrier of the films were favoured by higher immersion times in CaCl 2 and lower CTG concentrations. The negative CTG effects on such properties have been attributed to competition between the polysaccharides for interactions with calcium ions, reducing crosslinking density and loosening the film structure. On the other hand, this loosening effect resulted in higher film flexibility at higher CTG concentrations.