E550 – Sodium silicates
Anticaking agentDescription
Mixture of sodium oxide and silicon dioxide, produced by fusing sand and sodium carbonate
Notes
Sodium silicates are created by fusing sand (which is mainly silicon dioxide) with sodium carbonate (also known as soda ash) at extremely high temperatures, around 1000-1400°C. This process creates glass-like compounds that are then ground into powder or dissolved in water to create various forms of sodium silicate. Essentially, it's made from two very common materials: sand from the earth and a sodium compound that can be mined or manufactured. In food, sodium silicates work as anticaking agents and binding agents. As an anticaking agent, they prevent powdered foods like salt, spices, or powdered soups from clumping together by absorbing moisture. As a binding agent, they help hold ingredients together in processed foods. You might find them in table salt, dried egg products, some baking powders, and various powdered food mixes. This is a synthetic compound, though it's made from naturally abundant raw materials. It's suitable for vegetarian and vegan diets since it contains no animal products, and it doesn't conflict with religious dietary restrictions. The silicates pass through the body without being absorbed, making them essentially inert from a nutritional standpoint. Food safety authorities have approved its use in small quantities, as it's considered safe for human consumption.