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Absolute Quantum Yield Measurement of Powder Samples
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Engineering quantum dot calibration standards for quantitative fluorescent profiling.

Felipe T Lee-Montiel1, P I Imoukhuede

  • 1University of Illinois Urbana-Champaign, Department of Bioengineering, 1304 W Springfield Avenue, 3235 Digital Computer Laboratory, Urbana, IL 61801, USA. pii@illinois.edu.

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|April 9, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed quantitative quantum dot (Qdot) calibration beads using biotin-streptavidin chemistry. These beads enable accurate measurement of cellular heterogeneity in biophotonic applications.

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Area of Science:

  • Biophotonics
  • Nanotechnology
  • Cell Biology

Background:

  • Fluorescence tools, especially optimized fluorophores, are vital for mapping cellular heterogeneity.
  • Quantum dot (Qdot) technology offers a novel approach for cellular dispersion characterization but requires sensitive calibration standards.

Purpose of the Study:

  • To develop and characterize quantitative Qdot calibration beads for improved cellular heterogeneity profiling.
  • To establish a laboratory-accessible method for calibrating Qdot-based biophotonic measurements.

Main Methods:

  • Utilized biotin-streptavidin chemistry to conjugate commercially available ITK-streptavidin Qdots to biotin-coated polystyrene beads.
  • Engineered Qdot calibration beads with emission spectra at 525, 565, 605, 655, and 705 nm.
  • Quantified Qdot levels and loss during isolation using inductively coupled plasma mass spectrometry (ICP-MS) and fluorescence measurements.

Main Results:

  • Established Qdot calibration beads providing standards in the 0.0072-0.72 nM Qdot range (800-80,000 Qdots/bead).
  • Determined a linear relationship between fluorescence intensity and Qdot number.
  • Reported cadmium concentrations per Qdot for various emission spectra and compared fluorescence-based estimates with ICP-MS results.

Conclusions:

  • The study provides optimal conditions for preparing Qdot calibration beads from commercial Qdots.
  • These beads serve as reliable standards for quantitative biophotonic applications, including cell surface heterogeneity measurements.
  • The developed method enhances the accuracy and accessibility of Qdot-based cellular analysis.