What Factors Affect Gelatin Viscosity?

Gelatin is a common product in the food processing industry, used to increase the viscosity of foods. Sometimes, however, adding gelatin to a food does not raise its viscosity as expected, which indicates that the viscosity of the gelatin has decreased. So what factors affect the viscosity of this product? Below we answer this question in detail - let's take a look!

When gelatin is dispersed in cold water, it develops a strong viscosity after about 2 hours, and the viscosity continues to increase gradually over time, peaking after 24 hours, with a thickening power 5 to 8 times that of tapioca starch paste. Solution concentration: whether the gelatin is of low, medium, or high viscosity, its viscosity curve rises almost vertically as the solution concentration increases, and this is even more pronounced with high-viscosity gelatin.

pH: In a saturated solution at pH 6.5-9.0, the viscosity of gelatin is strong and stable. In general, viscosity does not change much within the pH range of 6.0-11.0. For medium- and high-viscosity gelatin, viscosity drops rapidly once the pH exceeds 11.5, while low-viscosity gelatin is less affected. Temperature: as the temperature of a saturated solution rises, its viscosity decreases accordingly. Once the temperature climbs beyond a certain point (generally above 50 C), a permanent loss of viscosity occurs. As long as the temperature stays below the range that triggers permanent viscosity loss, the viscosity can recover once the temperature drops.

Effect of salts: the effect of salts on gelatin is determined almost entirely by the valence of the cation. A saturated solution remains water-soluble when exposed to monovalent cation salts, forms insoluble salts with trivalent cation salts, while divalent cation salts fall somewhere in between. Using a 5% HS5 guar gum saturated solution, add salt and heat it, then let it cool naturally to 25% and re-measure its viscosity.

This article is sourced from the internet. If there is any infringement or violation, please contact us for removal or revision.