Preservative systems based on cationic surfactants are known in the art of science. A typical example of such cationic surfactants is the ethyl ester of the lauramide of arginine monohydrochloride (LAE®). In addition to the chloride form, the corresponding bromide and sulfate salts are also known.

It was found:
- That other salts of cationic surfactants display excellent properties, such as the salts of lactic acid, glutamic acid and acetic acid.
- That the combination of the cationic surfactants, with at least one salt of an organic or inorganic acid offers an excellent preservative action.
- An additional preservative system with favorable properties was the combination of the cationic surfactants with at least one ester compound, amide or enzyme inhibitor.
- Also, the combination of the cationic surfactant with a further cationic molecule such as ethyl arginate, glucosamine or chitosan led to an effective preservative system.
- Besides, a preservative system of the encapsulated cationic surfactant has also shown effectiveness.

In addition, the European Patent Office has granted the corresponding European patent. 

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