GB/T 15399-1994 Specifies the determination of sulfur-containing amino acids in feed, using Ion exchange chromatography, IEC. The standard specifies the required instruments and equipment, such as ion exchange Chromatograph and its key parameters. Detailed pre-treatment of feed samples to make suitable test solutions. Using ion exchange Chromatography Column to separate sulfur-containing amino acids, different amino acids are elute in sequence, and the content of sulfur-containing amino acids such as methionine and cystine is accurately determined by Detector detection combined with standard Linear dispersion. The standard provides a reliable means for mass detection of feed, helps to ensure the accuracy of feed nutrients, and meets the needs of animal growth for sulfur-containing amino acids.