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豆干经过乙腈简单的超声提取,离心分离,上清液经过滤头过滤,用高效液相色谱法测定豆干中的二甲基黄的含量。得到豆干中二甲基黄的方法检出限5μg/kg,加标回收率在91.8%~96.0%,精密度为0.60%,符合国家标准。本法操作简便、准确度高和重现性好。
The dried tofu was subjected to simple ultrasonic extraction by acetonitrile, centrifuged, and the supernatant was filtered through a filter. The content of dimethyl yellow in tofu was determined by high performance liquid chromatography. The detection limit of the method was 5μg / kg, the recoveries were 91.8% ~ 96.0% and the precision was 0.60%, which accorded with the national standard. This method is simple, accurate and reproducible.