Fluorometric label-free aptasensor for detection of the pesticide acetamiprid by using cationic carbon dots prepared with cetrimonium bromide. View Full Text


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Article Info

DATE

2019-05

AUTHORS

Zeinab Saberi, Behzad Rezaei, Ali Ashghar Ensafi

ABSTRACT

A fluorometric aptamer-based method is described for sensitive detection of the pesticide acetamiprid. Cationic carbon dots (cCDs) with blue fluorescence were synthesized from cetrimonium bromide (CTAB) by a hydrothermal method. In the presence of the acetamiprid aptamers with a negative charge, the aptamers bind to the surface of the cCDs due to electrostatic attraction. As a result, the fluorescence of the cCDs is quenched partially (the best measurement was done at excitation/emission wavelengths of 360/445 nm). If acetamiprid is added to the above system, the aptamer binds to acetamiprid as a target with strong and specific affinity. Therefore, fluorescence increases proportionally to the acetamiprid concentrations. The aptasensor has a detection limit of 0.3 nM with a dynamic range from 1.6 to 120 nM which reveals that the method is sensitive in comparison to the other techniques. The selectivity of the method towards various pesticides was also studied and found to be adequate. The sensor was applied for the determination of acetamiprid in (spiked) wastewater, tap water, and tomatoes to underpin its practicability. Graphical abstract Cationic CDs (cCDs) were synthesized from cetrimonium bromide by a hydrothermal method. The addition of the negatively charged acetamiprid aptamer to a solution containing cCDs, the cCDs will be coated by the aptamer. This causes the blue fluorescence of the cCDs partially is quenched. If acetamiprid (ACP) is then added, the aptamer will bind to acetamiprid with strong and specific affinity. Hence, fluorescence will be gradually restored. More... »

PAGES

273

References to SciGraph publications

  • 2018-01. Engineering carbon quantum dots for photomediated theranostics in NANO RESEARCH
  • 2017-12. Carbon Dots-AS1411 Aptamer Nanoconjugate for Ultrasensitive Spectrofluorometric Detection of Cancer Cells in SCIENTIFIC REPORTS
  • 2017-01. Aptamer based fluorometric acetamiprid assay using three kinds of nanoparticles for powerful signal amplification in MICROCHIMICA ACTA
  • 2018-02. Determination of bromate via the chemiluminescence generated in the sulfite and carbon quantum dot system in MICROCHIMICA ACTA
  • 2018-02. Aptamer-based fluorescent platform for ultrasensitive adenosine detection utilizing Fe3O4 magnetic nanoparticles and silver nanoparticles in MICROCHIMICA ACTA
  • 2017-10. Hydrothermal synthesis of N-doped carbon dots for selective fluorescent sensing and cellular imaging of cobalt(II) in MICROCHIMICA ACTA
  • 2018-06. A fluorometric aptasensor for methamphetamine based on fluorescence resonance energy transfer using cobalt oxyhydroxide nanosheets and carbon dots in MICROCHIMICA ACTA
  • 2018-05. Fluorometric aptasensing of the neonicotinoid insecticide acetamiprid by using multiple complementary strands and gold nanoparticles in MICROCHIMICA ACTA
  • 2018-01. N-Doped graphene quantum dot@mesoporous silica nanoparticles modified with hyaluronic acid for fluorescent imaging of tumor cells and drug delivery in MICROCHIMICA ACTA
  • 2016-01. Organic Solvent-Saving Sample Preparation for Systematic Residue Analysis of Neonicotinoid Insecticides in Agricultural Products Using Liquid Chromatography−Diode Array Detection in FOOD ANALYTICAL METHODS
  • 2017-02. Determination of neonicotinoid insecticides in natural waters by high-resolution time-of-flight mass spectrometry with direct electrospray ionization of samples in JOURNAL OF ANALYTICAL CHEMISTRY
  • Journal

    TITLE

    Microchimica Acta

    ISSUE

    5

    VOLUME

    186

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00604-019-3378-9

    DOI

    http://dx.doi.org/10.1007/s00604-019-3378-9

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1113301011

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30963279


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    38 schema:description A fluorometric aptamer-based method is described for sensitive detection of the pesticide acetamiprid. Cationic carbon dots (cCDs) with blue fluorescence were synthesized from cetrimonium bromide (CTAB) by a hydrothermal method. In the presence of the acetamiprid aptamers with a negative charge, the aptamers bind to the surface of the cCDs due to electrostatic attraction. As a result, the fluorescence of the cCDs is quenched partially (the best measurement was done at excitation/emission wavelengths of 360/445 nm). If acetamiprid is added to the above system, the aptamer binds to acetamiprid as a target with strong and specific affinity. Therefore, fluorescence increases proportionally to the acetamiprid concentrations. The aptasensor has a detection limit of 0.3 nM with a dynamic range from 1.6 to 120 nM which reveals that the method is sensitive in comparison to the other techniques. The selectivity of the method towards various pesticides was also studied and found to be adequate. The sensor was applied for the determination of acetamiprid in (spiked) wastewater, tap water, and tomatoes to underpin its practicability. Graphical abstract Cationic CDs (cCDs) were synthesized from cetrimonium bromide by a hydrothermal method. The addition of the negatively charged acetamiprid aptamer to a solution containing cCDs, the cCDs will be coated by the aptamer. This causes the blue fluorescence of the cCDs partially is quenched. If acetamiprid (ACP) is then added, the aptamer will bind to acetamiprid with strong and specific affinity. Hence, fluorescence will be gradually restored.
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