Karragenan

Carrageenan is a generic term for a family of linear sulfated polysaccharides extracted from red edible seaweeds. These polysaccharides are composed of repeating units of galactose and anhydrogalactose. The specific properties and applications of carrageenan depend on the degree and position of sulfation, which varies depending on the source seaweed and extraction method.

Carrageenan is widely used as a thickening, gelling, and stabilizing agent in the food industry. It is found in a variety of products, including dairy products like ice cream and yogurt, processed meats, infant formula, and vegetarian alternatives. Its ability to form gels, increase viscosity, and suspend solids makes it a versatile ingredient. Different types of carrageenan, such as kappa, iota, and lambda, offer distinct gelling and thickening characteristics. Kappa carrageenan forms strong, brittle gels, iota carrageenan forms elastic gels, and lambda carrageenan does not gel but provides viscosity.

Beyond food, carrageenan has applications in pharmaceuticals and cosmetics as an emulsifier and stabilizer. It is also used in some industrial processes. While generally recognized as safe (GRAS) by regulatory bodies like the U.S. Food and Drug Administration (FDA) for food use, some studies have raised questions about its potential health effects, particularly concerning intestinal inflammation. However, scientific consensus and regulatory reviews generally support its safety when consumed within established limits. The extraction process typically involves alkaline treatment of seaweed to yield the purified carrageenan.