Abstract
Given the imperative of monitoring organophosphorus pesticides (OPs) residues in the ecosystem, here a novel, facile and sensitive fluorescence sensor is presented for the rapid detection of dimethoate. In this work, surface molecularly imprinted polymer (SMIP) and microfluidic technology had been introduced to enhance the selectivity and portability of the described methodology. Oil-soluble CdSe quantum dots (QDs) synthesized in a green way were used as fluorescent material for the selective detection of dimethoate on the basis of static quenching and photoinduced electron transfer mechanism. Among many kinds of paper materials, glass fiber paper was used as the novel substrate of paper chip due to low pristine fluorescence and better performance when combining CdSe QDs. In the process of molecular imprinting, the interaction between several functional monomers and dimethoate molecule was investigated and simulated theoretically by software to improve the selectivity of the sensor. Consequently, the fabricated novel detection platform could effectively respond to dimethoate in 10 min with the concentration range of 0.45–80 μmol/L and detection limit of 0.13 μmol/L. The recovery in the spiked experiment soybean sample was in an acceptable range (97.6–104.1%) and the accuracy was verified by gas chromatography-mass spectrometry, which signified the feasibility and potential in food sampling.
Highlights
Organophosphorus pesticides (OPs) have been widely used because of their excellent ability in the control of plant diseases and insect, which have contributed greatly to the prosperity and progress of agriculture [1]
Based on the above discussion, we focused on the advantages of oil-soluble quantum dots (QDs) and constructed a novel rapid detection platform
The thermal stability of synthesized molecularly imprinted polymers (MIPs) was characterized by a thermal analysis system (10 ◦C/min, N2) (TG, Q1000DSC + LNCS + FACS Q600SDT, TA Instrument, New Castle, DE, USA)
Summary
Organophosphorus pesticides (OPs) have been widely used because of their excellent ability in the control of plant diseases and insect, which have contributed greatly to the prosperity and progress of agriculture [1]. Acute and repeated exposures to OPs may cause a host of serious health problems including memory loss, anxiety, depression, psychotic symptoms, deficits in attention and information processing and even possibly coma or death [3] One such common organophosphorus pesticide is dimethoate which is widely used in the cultivation of fruit and grains. ΜPADs have many advantages, such as inexpensive cost, small size, convenient storage and transportation, consumption of a low volume of reagents, ease of mass production and above all, they are able to take effect without external force [17,18] At present, they are widely used in many fields from medical analysis and environmental monitoring to disease diagnosis [19]. The response time of paper chips to template molecules was only 10 min, which met the requirement of rapid detection
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