| http://www.w3.org/ns/prov#value | - Apart from natural surface-active compounds, for example saponin, it is mainly synthetic surface-active compounds (surfactants) which are used: non-ionic surfactants, for example alkene oxide compounds, glycerol compounds or glycidol compounds, cationic surfactants, for example higher alkylamines, quaternary ammonium salts, pyridine compounds and other heterocyclic compounds, sulphonium compounds
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