Journal
FOOD CHEMISTRY
Volume 364, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130216
Keywords
Imidacloprid; Double-mesoporous-layer; Molecularly imprinted nanoparticles; Adsorption removal; Detection
Funding
- National Natural Science Foundation of China [31671934]
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The double-mesoporous-layer imprinted polymer synthesized using imidacloprid as a template showed high adsorption capacity and selectivity for detecting IDP in food samples. The method allowed class-specific detection of IDP with excellent recovery rates and a low detection limit.
The double-mesoporous-layer imprinted polymer of mesoporous silica/mesoporous molecularly imprinted nanoparticles (MIP), with high specific surface area, rich porosity, excellent mass transfer rate and selectivity, were synthesized using imidacloprid (IDP) as a template. Under the optimal conditions of pH, contact time, concentration and temperature, MIP showed high adsorption capacity of 13.86 mu gmiddotmg(-1) toward IDP and the imprinting factor reached 3.5. The adsorption process model including binding isotherm and kinetics was investigated. MIP exhibited excellent regeneration and its adsorption and selectivity were outstanding among its structurally pesticide analogues. The recovery of spiked IDP for MIP in fortified real samples can reach 96.0 +/- 8.5% for cabbage and 105.0 +/- 9.9% for apple. The limit of detection of the enrichment method can be as low as 0.037 mu gmiddotmL-(1) with a good linear relationship (R-2 = 0.996) from 0.30 to 10.0 mu gmiddotmL(-1). The results indicated that the proposed method allowed class-specific detection of IDP in food samples.
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