Frequently asked questions (FAQ)


Silver is a chemical element, the chemical symbol of which is Ag. It can be found in nature as metal, the oxidation state of which is zero (Agº), or forming compounds such as sulphates, chlorides or silver iodides, the oxidation state of which is +1 (Ag +). One of the properties that are attributed to this metal is the high bactericidal power against a broad spectrum of microorganisms.


Colloidal silver is finely divided metallic silver. Being metallic silver, it is not combined with any other element and therefore has no electric charge, that is, it is in oxidation state zero (Agº). Metallic silver, being a noble metal, is not very active.


The use of silver as a bactericide and fungicide has been known for over 20 centuries. Already the ancient Greek and Roman civilisations used silver containers to preserve food and drink. Later, in the Crusades, it was a common practice to add a silver coin in containers in order to preserve liquids.

In the nineteenth century its use in medicine appearing, being an active principle of drugs of the time. This use has been extended until present, appearing in the formulation of medicines to prevent and treat infections.

In addition, the problems derived from the appearance of strains resistant to antibiotics have led to renewed interest in silver as an antibiotic agent. Recent studies have shown that silver particles have antimicrobial effects against a broad spectrum of Gram-negative and Gram-positive bacteria and they also show some anti-fungal and antiviral activity.


Currently, silver compounds are being used in many applications to control microbial proliferation in fields as diverse as medicine, cosmetics or industrial sectors.

Some examples of its applications are the coating of catheters and surgical material, the preparation of synthetic compounds for dentistry, the treatment of burns, homoeopathic medicine and even water purification.

Silver particles are being used in the food industry for purifying water and for designing new packaging systems with antimicrobial properties, in addition to coatings and surfaces of electrical appliances in contact with food.

The textile industry is also including this metal in the preparation of technical material. Sportswear to prevent odours or laboratory clothing to prevent bacteria growth, contain silver derivatives.

Another highly successful application where silver compounds are being introduced are antimicrobial coatings and surfaces.


In addition to the fact that the amount to be ingested is regulated by the WHO, several trials have been conducted where it is shown that silver does not cause irritation, it is safe in contact with one’s the skin and has been dermatologically tested.


Silver-containing formulations release ions though contact with environmental humidity, which are responsible for acting against bacteria. It is thought that they cross the cell wall of bacteria, reacting with their DNA and causing their death.

This detachment is very slow, which is a very effective and durable solution against bacteria. With very few ppm or ions. This antimicrobial action has been proven..


Tannic acid derivatives are used as astringents of plant origin in the pharmaceutical industry without altering the intestinal motility. It is an intestinal absorbent that is recommended for the treatment of common diarrhoeas and other gastrointestinal conditions.

Albumin thanate is used in both human and animal medicine.


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