This standard specifies the requirements, test method, inspection rules, marking, packaging, storage and transport of feed grade DL-methionine products.
This standard is applicable to feed grade DL-methionine produced with methylthiopropanal, cyanide, sulfuric acid and sodium hydroxide as main raw materials.
Chemical name: 2-Amino-4-(methylthio) butyric acid
Chemical formula: CH3S-CH2-CH2-CH(NH2)-COOH
Relative molecular mass: 149.2 (as per the international relative atomic mass in 2007)
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 1250 Rules for expression and judgment of limiting values
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB 10648 Feed label
GB/T 14699.1 Feeding stuffs - Sampling
Pharmacopoeia of the People’s Republic of China (Volume II) (2005 Edition)
3 Requirements
3.1 Appearance and properties
It is white or light gray powder or flaky crystal, which is slightly soluble in water, very slightly soluble in ethanol, and dissolved in dilute acid and sodium hydroxide (potassium) solution.
3.2 Technical indexes
The technical indexes shall meet those specified in Table 1.
