Investigative and environmental samples: For product samples >10 g (e.g. 100 g monitoring samples), for investigative samples, and for environmental samples from infant formula factories use BPW + Vm to perform the enrichment .

• 调研样和环境样:对于产品样>10克(例如监控100克),调研样和婴儿配方粉生产工厂的环境样,使用加万古霉素的BPW作为富增液。