Improving the Determination of Nitrovin in Feeds by Reversed-Phase LC with SPE

Abstract

A simple reversed-phase liquid chromatographic method with ultraviolet detector (378 nm) for the determination of nitrovin in feeds was improved and validated. The mobile phase was a mixture of acetonitrile and 0.1% formic acid solution (v/v) in the ratio of 50:50 (v/v), and the flow rate was set at 1.2 mL min⁻¹. The extraction solution was a mixture of dimethyl formamide, acetonitrile and methanol (50:25:25, v/v), the sample was cleaned-up with reversed-phase solid phase extraction cartridge. The standard nitrovin was purified with crude nitrovin product by ethylene glycol monoethyl ether and identified by elemental analyzer. The limit of detection was 0.05 mg kg⁻¹ and the limit of quatification was 0.2 mg kg⁻¹ in feeds. The assay had satisfactory selectivity, recovery, linearity and precise repeatability and trueness.