The second curve is fish gelatin extracted with minimal hydrolysis. The lowest curve is commercial fish gelatin, which was hydrolyzed more to achieve certain viscosity characteristics. There are similarities between the two collagens. Beta collagen would be two alpha collagens covalently linked together. The gelatin is protected by a mixture of methyl and propyl hydroxybenzoates.
Fish gelatin has similar chemical reactivity to animal gelatin.
Aldehides such as formaldehyde, gluteraldehyde and glyoxal will cross-link and harden the gelatin under appropriate conditions. It can be reacted with anydrides under alkaline conditions, reducing or eliminating the effect of aldehydes as a hardening agent on the gelatin. Fish gelatin also provides a good medium for precipitating silver halide emulsions, as this can be done at lower temperatures than with animal gelatin. Our factory is located on the southwestern tip of Nova Scotia, Canada, in an area rich in fishing grounds. Skins are obtained from frozen fish producers, as well as salt fish processors.