Detection of quinolones

This standard specifies a liquid chromatography-tandem mass spectrometry method for the determination of residual amounts of enrofloxacin, dafloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin in milk and powdered milk. This standard is applicable to the determination and confirmation of residual amounts of enrofloxacin, ofloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin in milk and powdered milk. The detection limit of this standard method is 1 ug/kg for enrofloxacin, dafloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin in milk; Enrofloxacin, Dafloxacin, Ciprofloxacin, Salafloxacin, Obifloxacin, Diflufloxacin, and Mabaofloxacin in milk powder are all 4 ug/kg. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 6379.1 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part 1: General Principles and Definitions (GB/T 6379.1-2004, ISO 5725-1: 1994, IDT) GB/T 6379.2 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part 2; The Basic Method for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004, ISO 5725-2:1994, IDT) GB/T6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-2008, ISO 36961987, MOD) Principle: Using Acetonitrile and Phosphate Buffer Solution to Extract Residual Enrofloxacin, Dafloxacin, Ciprofloxacin, Salafloxacin, Obifloxacin, Diflufloxacin, and Mabaofloxacin from Samples, and Using Oasis HLB Solid Phase Extraction Column for Purification, 5% ammonia methanol solution elution, liquid chromatography-tandem mass spectrometry determination, external standard method quantification

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