Ionomeric films of alginic acid

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 mu...

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Veröffentlicht in:Journal of food science 1999, Vol.64 (1), p.61-63
Hauptverfasser: Pavlath, A.E, Gossett, C, Camirand, W, Robertson, G.H
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container_title Journal of food science
container_volume 64
creator Pavlath, A.E
Gossett, C
Camirand, W
Robertson, G.H
description 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 magnesium ions had little effect on properties of the films. Copper and aluminum showed intermediate effect, but treatment with cupric ion resulted in a fast crosslinking of the surface without affecting the inside of the film. This resulted in the formation of a tube when opposing surfaces were pulled apart.
doi_str_mv 10.1111/j.1365-2621.1999.tb09861.x
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subjects Acids
algin
alginates
aluminum
Biological and medical sciences
Calcium
chemical reactions
Copper
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Handling, storage, packaging, transport
Ions
iron
magnesium
molecular conformation
multivalent ions
salts
solubility
Solutions
surfaces
tensile strength
zinc
title Ionomeric films of alginic acid
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