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Magnesium Aluminosilicate: Uses & Safety

Magnesium Aluminosilicate is a naturally occurring mineral used in pharmaceuticals, food production, and cosmetics as a binder, stabilizer, and anti-caking agent.

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Things worth knowing about "Magnesium Aluminosilicate"

Magnesium Aluminosilicate is a naturally occurring mineral used in pharmaceuticals, food production, and cosmetics as a binder, stabilizer, and anti-caking agent.

What is Magnesium Aluminosilicate?

Magnesium Aluminosilicate is an inorganic mineral belonging to the group of layered silicates (phyllosilicates). It is composed of magnesium, aluminum, and silicon oxides and occurs naturally as a component of clay minerals. It is widely used as a functional excipient in the pharmaceutical, food, and cosmetic industries. Within the European Union, related aluminosilicate compounds are approved as food additives, with aluminum silicate listed under E559 and magnesium silicate under E553.

Chemical Properties and Origin

Magnesium Aluminosilicate belongs to the smectite group, a family of swelling clay minerals with a characteristic layered structure. This structure provides a high specific surface area and notable swelling capacity in water, making it a versatile ingredient across multiple industries.

Chemical structure: Variable Al-Mg silicate complex with layered arrangement
Appearance: White to off-white, odorless powder
Solubility: Practically insoluble in water; swells to form colloidal gels
Origin: Naturally found in clay deposits; also synthetically producible

Pharmaceutical Applications

In the pharmaceutical industry, Magnesium Aluminosilicate is commonly used as an excipient in solid and semi-solid dosage forms. It serves several important functions:

Binder: Improves the cohesion of tablet masses during compression
Disintegrant: Promotes swelling and break-up of tablets after ingestion
Stabilizer: Stabilizes suspensions and emulsions through its gel-forming properties
Adsorbent: Can bind active substances to its surface, modulating drug release
Viscosity modifier: Used in semi-solid preparations such as gels and creams

Food Industry Applications

As a food additive, Magnesium Aluminosilicate primarily functions as an anti-caking agent and separating agent. It prevents powdered food products such as table salt, spice blends, and dried food products from clumping together. Permitted maximum levels are regulated under EU Food Additives Regulation (EC) No. 1333/2008.

Cosmetic Applications

In cosmetic formulations, Magnesium Aluminosilicate is used as a thickener, stabilizer, and suspending agent. It improves the texture of lotions, creams, and makeup products and ensures even distribution of pigments and active ingredients.

Safety and Tolerability

Magnesium Aluminosilicate is considered safe when used as intended. As the substance is practically not absorbed in the gastrointestinal tract following oral intake, systemic exposure is minimal. However, the following points should be noted:

Drug interactions: As an adsorbent, Magnesium Aluminosilicate may reduce the absorption of certain medications. A time interval between administration of this substance and other medications is advisable.
Aluminum content: In individuals with impaired kidney function, aluminum exposure from aluminum-containing compounds should be monitored.
Allergic reactions: Extremely rare and not considered clinically significant under normal conditions of use.

Regulatory Status

Magnesium Aluminosilicate has been assessed as safe by several international regulatory authorities. The U.S. Food and Drug Administration (FDA) includes it in the list of substances Generally Recognized as Safe (GRAS). The European Food Safety Authority (EFSA) has evaluated related aluminosilicate compounds in food and established acceptable daily intake values.

References

European Food Safety Authority (EFSA): Scientific opinion on the re-evaluation of aluminium silicates (E 559) as a food additive. EFSA Journal, 2018.
Rowe, R.C., Sheskey, P.J., Quinn, M.E.: Handbook of Pharmaceutical Excipients. 7th Edition. Pharmaceutical Press, London, 2012.
US Food and Drug Administration (FDA): GRAS Substances Database. U.S. Department of Health and Human Services, 2023.

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