Application of Molecularly Imprinted Polymer Appended onto CdSe/ZnS Quantum Dots for Optosensing of Tocopherol in Rice
2014
Liu, Huilin | Fang, Guozhen | Zhu, Huidan | Wang, Shuo
Acting as a fluorescence sensing material, the molecularly imprinted polymer (MIP) appended onto quantum dots (QDs) was constructed through anchoring the MIP layer on CdSe/ZnS QDs by simple embedding for highly selective and sensitive optosensing of tocopherol (TP) in rice. The resulting composite of QDs with MIP showed higher template selectivity versus that of non-imprinted polymer (NIP). Under optimal conditions, the relative fluorescence intensity of MIP appended onto QDs decreased linearly (r² > 0.99) with the increasing TP in the concentration in the range of 1.16 × 10⁻⁷–1.74 × 10⁻³ mol L⁻¹with a detection limit of 5.80 × 10⁻⁸ mol L⁻¹, and the precision for five replicate detections of 1.0 × 10⁻⁴ mol L⁻¹TP was 2.17 % (relative standard deviation). Recoveries of 90.40 to 100.20 % were achieved by direct detection when MIP appended onto QDs was used for the selective separation of TP in rice samples.
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