Si NPs-FITC比率荧光探针灵敏检测食品中环丙沙星的残留
Si NPs-FITC ratiometric fluorescent probe for sensitive detection of ciprofloxacin residues in food
为解决牛奶和肉制品中环丙沙星(ciprofloxacin,CIP)药物的残留问题,构建了一种新型探针,基于比率荧光传感技术实现CIP残留的检测。以3-氨丙基三甲氧基硅烷(APTMS)和单宁酸为原料,通过一步水热法快速制备了发射蓝色荧光的Si NPs,并与异硫氰酸荧光素(FITC)混合制备双信号发射的荧光探针Si NPs-FITC。通过TEM、XRD、FT-IR对Si NPs进行表征。基于CIP可以有效猝灭Si NPs-FITC探针荧光强度的现象,建立了快速、准确的检测环丙沙星的荧光新方法。在最优检测条件下,该方法的线性范围为8.54~400 μmol/L,检出限8.54 μmol/L。将该方法用于牛奶和肉制品中CIP的检测,表现出较高的稳定性和回收率,加标回收率为98.9%~106.6%。
To solve the problem of ciprofloxacin (CIP) drug residues in milk and meat products,a novel probe was constructed in this study to realize the detection of CIP residues based on ratio fluorescence sensing technology.Blue-emitting Si NPs were rapidly prepared by a one-step hydrothermal method using 3-aminopropyltrimethoxysilane (APTMS) and tannic acid as raw materials,and then mixed with fluorescein isothiocyanate (FITC) to prepare a dual-signal-emitting fluorescent probe,Si NPs-FITC.Si NPs were characterized by TEM,XRD,and FT-IR.Based on the phenomenon that CIP can effectively quench the fluorescence intensity of the Si NPs-FITC probe,a rapid and accurate fluorescence method for the detection of ciprofloxacin was established.Under the optimal detection conditions,the linear range of this method was 8.54 to 400 μmol/L,and the detection limit was 8.54 μmol/L.When this method was applied to the detection of CIP in milk and meat products,it exhibited high stability and recovery rates,with the spiked recovery ranging from 98.9% to 106.6%.
fluorescent nanomaterials / ciprofloxacin detection / ratiometric fluorescence
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