3c306 | — | DL-methionyl-DL-methionine | Additive compositionCrystalline powder from chemical synthesis with a minimum of 93 % DL-methionyl-DL-methionine, a maximum of 3 % DL-methionine and a maximum of 3 % sodium sulphate (on a dry matter basis)Characterisation of the active substanceDL-methionyl-DL-methionine (2-[(2-amino-4-methylsulfanylbutanoyl)amino]-4-methylsulfanylbutanoic acid)Chemical formula: C10H20N2O3S2CAS number: 52715-93-2Analytical methodFor the quantification of DL-methionyl-DL-methionine in the feed additive: reversed-phase high performance liquid chromatography coupled to photometric detection at 205 nm (RP-HPLC-UV).For the quantification of DL-methionyl-DL-methionine in premixtures, compound feed and feed materials: ion exchange chromatography coupled with post-column derivatisation and photometric detection at 570 nm (IEC-UV). | Fish and crustaceans | — | | | The moisture content shall be indicated on the labelling. | 9 September 2025 |