E558 – Bentonite
Anticaking agentDescription
Hydrated aluminum phyllosilicate; a type of clay formed from volcanic ash
Notes
Bentonite is a natural clay that forms when volcanic ash breaks down over millions of years, creating what scientists call a 'hydrated aluminum phyllosilicate' – essentially thin, flat mineral crystals that can absorb water and other substances. This clay is mined from deposits around the world, particularly in areas with ancient volcanic activity. The raw bentonite is then purified and processed to remove impurities, creating a fine powder or paste suitable for food use. In the food industry, bentonite primarily serves as a filtering agent, particularly in wine and beer production where it helps remove unwanted proteins and particles that could make beverages cloudy. It works by attracting and binding to these substances, which then settle out and can be removed, leaving behind a clearer, more stable product. You might also find it used in some fruit juices and other beverages that require clarification. Since bentonite is a natural clay mineral, it's completely natural rather than synthetic. It's suitable for vegetarian and vegan diets as it contains no animal-derived ingredients. The clay passes through the digestive system without being absorbed, and the tiny amounts that might remain in filtered beverages after processing are considered safe for consumption by food safety authorities.