A novel molecularly imprinted polymer on CdSe/ZnS quantum dots for highly selective optosensing of mycotoxin zearalenone in cereal samples
作者:Guozhen Fang、Chao Fan、Huilin Liu、Mingfei Pan、Huidan Zhu、Shuo Wang
DOI:10.1039/c3ra45172k
日期:——
A novel molecularly imprinted optosensing material (MIOM) based on ionic liquid (IL)-stabilized CdSe/ZnS quantum dots (QDs) was prepared, for highly selective and sensitive recognition of the mycotoxin zearalenone (ZON). ZON is expensive and highly toxic, so the ZON analog cyclodo-decanyl-2,4-dihydroxybenzoate (CDHB) was instead used as the template. MIOM was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and adsorption experiment. Under optimal conditions, the relative fluorescence intensity of MIOM decreased linearly with increasing ZON concentration, in the range of 0.003–3.12 μmol L−1. MIOM had a detection limit of 0.002 μmol L−1. MIOM was used to detect ZON in corn, rice and wheat flours, and at three concentration levels 50, 100 and 500 ng g−1, ZON recoveries for these three cereals were 94.2–98.7%, 93.1–107.6% and 84.4–106.0%, respectively.
制备了一种基于离子液体(IL)稳定的 CdSe/ZnS 量子点(QD)的新型分子印迹光传感材料(MIOM),用于高选择性和灵敏地识别霉菌毒素玉米赤霉烯酮(ZON)。 ZON 价格昂贵且毒性较高,因此使用 ZON 类似物环癸基-2,4-二羟基苯甲酸酯 (CDHB) 作为模板。通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和吸附实验对MIOM进行了表征。在最佳条件下,MIOM的相对荧光强度随着ZON浓度的增加而线性下降,范围为0.003~3.12 μmol L−1。 MIOM 的检测限为 0.002 μmol L−1。 MIOM 用于检测玉米、大米和小麦粉中的 ZON,在 50、100 和 500 ng g−1 三个浓度水平下,这三种谷物的 ZON 回收率分别为 94.2–98.7%、93.1–107.6% 和 84.4–106.0% , 分别。