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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
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Felodipine Determination by a CdTe Quantum Dot-Based Fluorescent Probe.

Yuguang Lv1,2, Yuqing Cheng2, Kuilin Lv3

  • 1School of Stomatology, Jiamusi University, Jiamusi 154002, China.

Micromachines
|May 28, 2022
PubMed
Summary

A novel fluorescent probe using cadmium telluride (CdTe) quantum dots was developed for detecting felodipine (FEL). This probe offers a sensitive and reliable method for quantifying FEL in tablet formulations.

Keywords:
CdTe quantum dotsdrug testingfelodipinefluorescence quenching

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Area of Science:

  • Materials Science: Synthesis and characterization of novel nanomaterials.
  • Analytical Chemistry: Development of sensitive fluorescent probes for drug analysis.

Background:

  • Felodipine (FEL) is a crucial calcium channel blocker used in treating hypertension.
  • Accurate quantification of FEL in pharmaceutical formulations is essential for quality control and patient safety.
  • Existing analytical methods for FEL may lack sensitivity or require complex sample preparation.

Purpose of the Study:

  • To synthesize and characterize cadmium telluride (CdTe) quantum dots (QDs) for use as a fluorescent probe.
  • To establish optimal conditions for the interaction between CdTe QDs and FEL.
  • To develop and validate a sensitive fluorescent method for determining FEL content in tablet formulations.

Main Methods:

  • CdTe QDs were synthesized using controlled precursor ratios, temperature, and pH.
  • Characterization involved fluorescence spectrophotometry, FT-IR, XRD, UV-visible spectroscopy, and TEM.
  • Optimization of probe-analyte interaction involved adjusting FEL dosage, buffer pH, buffer volume, and reaction time.
  • A standard curve was generated to determine the linear range and sensitivity of the method.

Main Results:

  • CdTe QDs with strong, symmetric emission at 545 nm and a particle size of approximately 5 nm were successfully synthesized.
  • Optimal reaction conditions included a FEL dosage of 1.0 mL, Tris-HCl buffer pH of 8.2, 1.5 mL buffer, and a 20 min reaction time.
  • The developed method exhibited a wide linear range (5 × 10-6-1.1 × 10-4 mol/L) with a high correlation coefficient (R2 = 0.9986).

Conclusions:

  • A robust CdTe quantum dot-based fluorescent probe was successfully constructed.
  • The developed probe provides a sensitive and reliable method for the quantitative determination of felodipine in tablet samples.
  • This method holds potential for pharmaceutical quality control and drug analysis.