Molecularly imprinted optosensing material based on hydrophobic CdSe quantum dots via a reverse microemulsion for specific recognition of ractopamine.
A novel molecularly imprinted polymer (MIP) based on hydrophobic CdSe quantum dots (QDs) was synthesized using a one-pot room-temperature reverse microemulsion polymerization, and this polymer was applied as a molecular recognition element to construct a ractopamine (RAC) optosensor. Here, hydrophobic CdSe QDs were first introduced to the hydrophilic analyte-imprinted polymer for highly selective and sensitive detection of RAC via the change in fluorescence intensity, because of the high-quality hydrophobic QDs with high quantum yield, sharp photoluminescence spectra and chemical and fluorescent stability. Under optimal conditions, the relative fluorescence intensity of MIP based on hydrophobic QDs decreased linearly with the increasing concentration of RAC in the range of 1.21 × 10(-9) -3.03 × 10(-6)mol L(-1) with a detection limit of 7.57 × 10(-10)mol L(-1), and the precision for five replicate detections of 1.51 × 10(-8)mol L(-1) RAC was 2.09% (relative standard deviation). The proposed method was successfully applied for the determination of trace RAC in pork samples, with good recoveries ranging from 82.79% to 97.23%.
['Liu|Huilin|H|', 'Fang|Guozhen|G|', 'Wang|Shuo|S|']
D000818:Animals D019187:Cadmium Compounds D004655:Emulsions D005504:Food Analysis D005506:Food Contamination D057927:Hydrophobic and Hydrophilic Interactions D008460:Meat D054802:Molecular Imprinting D010627:Phenethylamines D011108:Polymers D045663:Quantum Dots D018036:Selenium Compounds D013050:Spectrometry, Fluorescence D013552:Swine
Optosensing material Quantum dots Reverse microemulsion Ractopamine Molecularly imprinted polymer