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Can silica be used in food？
2024.11.28
Can silica be used in food？
Silica can be used in food, but there are limits. Silicon dioxide is used in food industry as anti-coagulation agent, defoamer, thickener, filter aid and clarifying agent. China's "Health Standard for the Use of Food Additives" (GB2760-2014) stipulates: can be used in egg powder, powdered sugar, milk powder, cocoa powder, cocoa butter, plant powder, instant coffee, soup powder, etc., the maximum use of 15g/kg; Powder essence, the maximum usage is 80g/kg; For solid drinks, the maximum usage is 0.2g/kg; Grain, 1.2g/kg.
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Silicon dioxide is one of the anticoagulants. Anti-caking agents, also known as anti-caking agents, are substances used to prevent particles or powdered food from aggregating boundary blocks and keep them loose or free-flowing. Its particles are fine, loose and porous, strong adsorption force, and easy to adsorb resulting in the formation of dispersed moisture, grease, etc., so that food can maintain powder or particle state.
Silicon dioxide is used as anti-coagulating agent, mainly used in egg powder, milk powder, cocoa powder, cocoa butter, sugar powder, plant fat powder, instant coffee, powdered soup and powder flavor. Due to temperature change, humidity increase or pile pressure between packages, food powder is easy to stick together and agglomerate, which affects product quality and storage period. The use of silica in food can play an anti-caking role, which is mainly through the packaging of food powder particles to separate the particles, keep the powder in the best free flow state, to achieve the purpose of anti-caking. In addition, the silica wrapped in the powder absorbs the moisture of the surrounding air with numerous internal pores, preventing the food from becoming damp and clumping during storage.
Silicon dioxide Nanopowder
Product overview
The basic structure of nano-silica is SiO2, which is amorphous white powder, and the microstructure can be spherical, flocculent or reticulated quasi-particle structure. The presence of unsaturated residual bonds and hydroxyl groups in different bonded states on its surface makes it excellent in a variety of applications. There are three main methods for the preparation of nano silica, including: precipitation method: through the high temperature hydrolysis of silicon halide in the hydrogen and oxygen flame to generate nano silica. Sol-gel method: using silanol as the precursor, hydrolysis and condensation in solvent to form sol and gel, and then drying and calcination to get nano silica. Vapor phase method: The silica halide is hydrolyzed at high temperature in an oxyhydrogen flame to produce nano silica.
Technical parameter
Form: White powder
Purity: 99%
Particle size: 20 nm
Specific surface area: 145-160 m2/g
The surface of this product has many hydroxyl groups and good water absorption
Product characteristics
High specific surface area: Due to its small particle size, nano-silica has a very high specific surface area, which provides it with more active sites.
Reflectance: It can effectively reflect ultraviolet, visible and infrared light, so it is very useful in many applications that require UV protection.
Biocompatibility: Nano-silica has good biocompatibility and can be used in the biomedical field.
Product application
Electronic packaging materials: Because of its high dielectric, high heat resistance, high filling capacity and other characteristics, it is widely used in the electronic and electrical industry.
Rubber modification: improve the tensile strength, tear resistance and wear resistance of rubber products, and significantly improve the performance of rubber.
Coatings and adhesives: Used to improve the rheological and thixotropic properties of coatings and adhesives, enhance their anti-settling and thickening effects.
Optoelectronics: It is widely used in optical sensors, solar cells, display technology, etc., such as improving the photoelectric conversion efficiency of dye-sensitized solar cells.
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