Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University (BTBU), 11 Fucheng Road, Beijing 100048, China.
Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University (BTBU), 11 Fucheng Road, Beijing 100048, China.
Biosens Bioelectron. 2016 Mar 15;77:512-7. doi: 10.1016/j.bios.2015.10.007. Epub 2015 Oct 9.
A novel optosensing system based on quantum dots (QDs)-labeled on the surface of a molecularly imprinted polymer (MIP) was developed for turn-off fluorescence sensing of dicyandiamide (DCD). The QDs were modified with silica to covalently adhere to the MIP surface, which resulted in a higher fluorescence quantum yield than MIP-coated QDs. Under optimal conditions, there was a linear relationship, with a correlation coefficient of 0.9950, between the fluorescence intensity and the DCD concentration over the range 5-1600 μmolL(-1). The detection limit of this system was 2.7 μmolL(-1). The proposed method exhibited with good recoveries ranging from 95% to 106%. Most importantly, the optosensing approach can be successfully applied for the determination of DCD in dairy products. With excellent sensitivity and selectivity, such simple and cheap materials are potentially suitable for monitoring of DCD in other food, in agriculture and for environmental applications.
一种基于量子点（QDs）的新型光感系统被开发出来，用于检测二氰二胺（DCD）的关闭荧光传感。量子点被修饰了二氧化硅，使其能够与分子印迹聚合物（MIP）表面共价结合，这导致其荧光量子产率高于 MIP 涂层的量子点。在最佳条件下，荧光强度与 DCD 浓度在 5-1600 μmolL(-1)范围内呈线性关系，相关系数为 0.9950。该系统的检测限为 2.7 μmolL(-1)。该方法的回收率在 95%至 106%之间。最重要的是，该光感方法可以成功应用于乳制品中 DCD 的测定。这种简单廉价的材料具有出色的灵敏度和选择性，有望适用于其他食品、农业和环境应用中 DCD 的监测。
