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Adsorbents – Effects and Applications

Adsorbents are substances that bind other compounds to their surface. In medicine and the food industry, they are used for detoxification and purification purposes.

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Things worth knowing about "Adsorbents"

Adsorbents are substances that bind other compounds to their surface. In medicine and the food industry, they are used for detoxification and purification purposes.

What are Adsorbents?

Adsorbents are substances capable of binding other materials – such as gases, liquids, or dissolved compounds – onto their surface through a process called adsorption. This differs from absorption, where substances are taken up into the interior of a material. Adsorbents are widely used in medicine, the food industry, and environmental and process engineering.

Types of Adsorbents

Activated Charcoal

Activated charcoal is the most well-known medical adsorbent. It has an extremely large internal surface area and is capable of binding a wide range of toxins, drugs, and harmful substances within the gastrointestinal tract. It is commonly used in cases of poisoning to prevent the absorption of harmful substances into the bloodstream.

Kaolin and Smectite

Kaolin (aluminium silicate) and smectite are natural clay minerals used as adsorbents in the treatment of diarrheal conditions. They bind bacterial toxins and harmful substances in the intestine and help protect the intestinal mucosa.

Cholestyramine

Cholestyramine is an ion exchange resin that binds bile acids, certain drugs, and toxins in the intestine. It is used, among other indications, to treat elevated cholesterol levels and in certain poisoning cases.

Adsorbents as Food Additives

In food processing, adsorbents are used to remove unwanted substances such as colorants, odors, or contaminants from food products. Typical examples include activated charcoal (E 153) and various silicates, which are used to clarify oils, juices, and other food products. These substances are considered safe when used appropriately and are approved within the European Union.

Medical Applications

In clinical practice, adsorbents are primarily used in the following situations:

Acute poisoning: Activated charcoal is administered orally to bind toxins in the gastrointestinal tract before they are absorbed into the bloodstream.
Diarrheal diseases: Clay minerals such as smectite reduce diarrhea and bind pathogens and their toxins.
Hypercholesterolaemia: Ion exchange resins bind bile acids, thereby lowering blood cholesterol levels.
Renal replacement therapy: Adsorptive techniques are used in haemodialysis to remove uremic substances from the blood.

Mechanism of Action

The effect of adsorbents is based on physical and chemical interactions between the surface of the adsorbent and the molecules to be bound. The specific surface area of the material is critical – the larger it is, the more substances can be bound. Activated charcoal, for example, can have an internal surface area of up to 1,500 m² per gram.

Safety and Side Effects

Adsorbents are generally well tolerated. However, the medical use of activated charcoal may cause the following side effects:

Black discoloration of stools
Constipation or diarrhea
Nausea and vomiting
With repeated administration: binding of medications and nutrients

The concurrent use of adsorbents with other medications should always be discussed with a physician, as the effectiveness of those medications may be reduced.

References

European Food Safety Authority (EFSA): Re-evaluation of activated charcoal (E 153) as a food additive. EFSA Journal, 2012.
Chyka PA, Seger D, Krenzelok EP, Vale JA: Position paper: Single-dose activated charcoal. Clinical Toxicology, 2005; 43(2): 61-87.
World Health Organization (WHO): Model Formulary 2008 – Antidotes and other substances used in poisonings. WHO Press, Geneva, 2008.

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