Liquid chromatographic method to determine narasin in feedingstuffs and premixtures: development, validation, and interlaboratory study.

A reversed-phase liquid chromatography (LC) method for narasin in feedingstuffs and premixtures was developed, validated, and interlaboratory studied. The extraction solvent was methanol-K2HPO4 solution (9 + 1, v/v). Narasin was detected at 600 nm after post-column derivatization with dimethylamino-benzaldehyde.

Liquid chromatographic method for nicarbazin in broiler feeds and premixtures: development, validation, and interlaboratory study.

A reversed-phase liquid chromatography method for nicarbazin in broiler feeds and premixtures was developed, validated, and interlaboratory studied. The extraction solvent was an acetonitrile-methanol (1 + 1) mixture. For feedingstuffs, water was also added.

Determination of maduramicin in feedingstuffs and premixtures by liquid chromatography: development, validation, and interlaboratory study.

A reversed-phase liquid chromatography method for determination of maduramicin in feedingstuffs and premixtures was developed, validated, and interlaboratory studied. The extraction solvent was methanol. Maduramicin was detected at 520 nm after postcolumn derivatization with vanillin.