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Tags：#Methodology #Colloidal gold detection kit #Milk testing #Veterinary drug residue screening #Background interference
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王
王小妹6692
2026-10-05
牛奶四环素背景干扰建议从基质前处理入手：夏季奶样先低温离心或过滤去部分脂肪，按说明书允许范围做适当稀释，并用缓冲液调节pH和离子强度，减少封闭剂负担。阴性样质控线弱时，避免用肉眼主观判读，可固定判读时间、距离和光线，或用读数仪拍照存档。做20至30个本底奶样和加标样连续验证，统计假阳性和假阴性，再决定是否调整稀释比例或处理液。
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AmyLab5542
2026-10-02
品牌对比可关注抗体对四环素类各成员的交叉反应和牛奶基质适配设计，不要只比标称灵敏度。不同厂家的胶体金在封闭蛋白、NC膜和胶体金粒径上差异会影响质控线稳定性和背景。若现有产品阴性质控线普遍偏弱、阳性判读不稳，可拿同批盲样做平行测试，记录C线和T线灰度及判读一致性。对于高风险或监管复核样本，可保留胶体金初筛，阳性结果用ELISA或液相复核。
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