In food additives, fumed silica is generally used instead of precipitated silica. Fumed silica, also known as thermal silica or fumed silica, is a nanoscale silica particle prepared by vapor deposition.

Fumed silica has the following advantages, making it widely used in food additives:

High purity: During the preparation of fumed silica, the reaction conditions and purity requirements can be controlled to obtain high-purity products. In food additives, purity is of utmost importance to ensure product safety and quality.

Fine particles: Fumed silica has a nanoscale particle size, usually between 5-50 nanometers. This fine particle size gives silica good dispersibility and thickening properties, helping to achieve uniform distribution and stability in food products.

Good stability: Fumed silica has good stability and heat resistance in food systems, and can maintain its functionality and characteristics under various processing and cooking conditions.

Versatility: Fumed silica can adjust its properties, such as specific surface area, porosity, and adsorption capacity, by controlling the preparation conditions. This allows it to play multiple roles in food such as thickener, anti-caking agent, adsorbent and rheological improvement, etc.

It should be noted that when using any food additives, it is necessary to abide by relevant laws and regulations, and use them in accordance with the prescribed dosage. In addition, according to the characteristics and application requirements of specific products, the appropriate type and brand of silica should be selected, and the test and verification should be carried out under appropriate conditions.