本文件规定了一种液相色谱-串联质谱（LC？MS/MS）方法，用于定量测定牛奶和奶制品中的抑制物质呋喃西林。 该方法已经过验证，可用于测量液态奶和奶粉中完整呋喃唑酮的微量水平，以整个产品（即粉末）为基础，含量低至1ng/g。虽然该方法预计将适用于其他乳制品基质，但还需要额外的验证来证明这一点。

This document specifies a liquid chromatography tandem mass spectrometry (LC?MS/MS) method for the quantification of the inhibitory substance, nitrofurazone, in milk and milk products. The method has been validated for measuring trace levels of intact nitrofurazone to levels down to 1 ng/g in fluid milk and powdered dairy products on a whole product (i.e. powder) basis. While the method is expected to apply to other dairy matrices, additional validation will be required to demonstrate this.