4.7 Article

Competitive immune-nanoplatforms with positive readout for the rapid detection of imidacloprid using gold nanoparticles

Journal

MICROCHIMICA ACTA
Volume 188, Issue 10, Pages -

Publisher

SPRINGER WIEN
DOI: 10.1007/s00604-021-05027-1

Keywords

Imidacloprid; Immune-nanoplatform; Fluorescence detection; Inner filter effect; Magnetic separation; Gold nanoparticles

Funding

  1. National Key Research and Development Program of China [2017YFF0210200]
  2. Fundamental Research Funds for the Central Universities [KYZ201618]
  3. National Natural Science Foundation of China [31772194]

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Two high-sensitivity competitive immune-nanoplatforms based on the inner filter effect (IFE-IN) and magnetic separation (MS-IN) were developed to detect imidacloprid (IMI) using gold nanoparticles (AuNPs). Both platforms showed excellent accuracy and reliability in detecting IMI.
Two high-sensitivity competitive immune-nanoplatforms based on the inner filter effect (IFE-IN) and magnetic separation (MS-IN) with a positive readout were developed to rapidly detect imidacloprid (IMI) using gold nanoparticles (AuNPs). For IFE-IN, IMI competes with AuNPs-labeled IMI antigens (IMI-BSA-AuNPs) to bind with anti-IMI monoclonal antibody (mAb)-conjugated NaYF4:Yb,Er upconversion nanoparticles, which changes the fluorescence signal at excitation/emission wavelength of 980/544 nm. For MS-IN, the immunocomplex of IMI-BSA-AuNPs and magnetic-nanoparticles-labeled mAb (mAb-MNPs) dissociates in the presence of IMI, and the optical density of IMI-BSA-AuNPs at 525 nm increases with the IMI concentration after magnetic separation. Under the optimal conditions, the IMI concentration producing a 50% saturation of the signal (SC50) and linear range (SC10- SC90) were found to be 4.30 ng mL(-1) and 0.47 - 21.37 ng mL(-1) for IFE-IN, while 1.21 ng mL(-1) and 0.07 -10.21 ng mL(-1) for MS-IN, respectively. Both IFE-IN and MS-IN achieved excellent accuracy for the detection of IMI in different matrices. The quantities of IMI in apple samples detected by IFE-IN and MS-IN were consistent with the high-performance liquid chromatography results.

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