1999
DOI: 10.1111/j.1365-2621.1999.tb09861.x
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Ionomeric Films of Alginic Acid

Abstract: Transparent, flexible films could be made by casting aqueous solutions of alginic acid, but they dissolved in water. When films were made from a solution of alginic acid and multivalent ions, they were still water soluble. However, when alginic acid films were immersed in a solution of salts with multivalent ions, they dissolved in water much more slowly, if at all. Treatment with calcium and zinc resulted in films insoluble in water and their tensile strength increased by an order of magnitude. Iron and magne… Show more

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Cited by 94 publications
(64 citation statements)
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“…29 Moreover, the addition of increased proportions of medium-chain triglyceride to zein films was closely related to the diminution in water vapour permeability. 30 Alginate alone exhibited poor moisture barrier properties, 31 but the addition of glycerol as plasticizer to the coating gave good results in terms of reducing the weight loss in tomato, with efficacy being similar to that of zein-oleic acid coating. In previous reports, the addition of 20% glycerol to 1% alginate or starch was sufficient to achieve the maximum reduction of moisture loss in apple and strawberry.…”
Section: Discussionmentioning
confidence: 93%
“…29 Moreover, the addition of increased proportions of medium-chain triglyceride to zein films was closely related to the diminution in water vapour permeability. 30 Alginate alone exhibited poor moisture barrier properties, 31 but the addition of glycerol as plasticizer to the coating gave good results in terms of reducing the weight loss in tomato, with efficacy being similar to that of zein-oleic acid coating. In previous reports, the addition of 20% glycerol to 1% alginate or starch was sufficient to achieve the maximum reduction of moisture loss in apple and strawberry.…”
Section: Discussionmentioning
confidence: 93%
“…Their ability to form strong and insoluble gels with divalent cations can be used to improve these shortcomings (Pavlath, Gossett, Camirand, & Robertson, 1999). Allen, Nelson, Steinberg, and Mcgill (1963) studying different calcium salts for alginate gel coating formation, classified calcium chloride as the most effective crosslinking agent.…”
Section: Introductionmentioning
confidence: 99%
“…Zactiti e Kieckbusch [21] também obtiveram filmes de alginato totalmente solúveis em água, quando manufaturados sem o estágio de reticulação final. Filmes de alginato completamente solúveis também foram obtidos por Pavlath et al [22] pela adição de 0,18 g CaCl 2 .2H 2 O/g alginato em um único estágio de procedimento. Formulações semelhantes as do presente trabalho contendo alginato de sódio foram apresentadas por Rajsharad e Kamble [23] para aplicação como filmes, coberturas, liberação controlada de fármacos, dentre outros.…”
Section: Resultsunclassified
“…Esse aumento da tensão na ruptura após o tratamento com cálcio pode ser explicado pela consolidação da reticulação entre os grupos carboxílicos presentes na molécula de alginato e os íons Ca ++ [22] . Rhim [25] também observou um aumento na tensão na ruptura depois do tratamento com CaCl 2 .…”
Section: Caracterização Física Dos Filmesunclassified