The development of quantum dot calibration beads and quantitative multicolor bioassays in flow cytometry and microscopy

Yang Wu, Samuel K Campos, Gabriel P. Lopez, Michelle A. Ozbun, Larry A. Sklar, Tione Buranda

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The use of fluorescence calibration beads has been the hallmark of quantitative flow cytometry. It has enabled the direct comparison of interlaboratory data as well as quality control in clinical flow cytometry. In this article, we describe a simple method for producing color-generalizable calibration beads based on streptavidin functionalized quantum dots. Based on their broad absorption spectra and relatively narrow emission, which is tunable on the basis of dot size, quantum dot calibration beads can be made for any fluorophore that matches their emission color. In an earlier publication, we characterized the spectroscopic properties of commercial streptavidin functionalized dots (Invitrogen). Here we describe the molecular assembly of these dots on biotinylated beads. The law of mass action is used to readily define the site densities of the dots on the beads. The applicability of these beads is tested against the industry standard, namely commercial fluorescein calibration beads. The utility of the calibration beads is also extended to the characterization surface densities of dot-labeled epidermal growth factor ligands as well as quantitative indicators of the binding of dot-labeled virus particles to cells.

Original languageEnglish (US)
Pages (from-to)180-192
Number of pages13
JournalAnalytical Biochemistry
Volume364
Issue number2
DOIs
StatePublished - May 15 2007
Externally publishedYes

Fingerprint

Quantum Dots
Flow cytometry
Bioassay
Biological Assay
Calibration
Semiconductor quantum dots
Microscopy
Flow Cytometry
Microscopic examination
Streptavidin
Color
Fluorophores
Fluorescein
Viruses
Epidermal Growth Factor
Quality Control
Virion
Quality control
Absorption spectra
Industry

Keywords

  • Bioassays
  • Calibration beads
  • Flow cytometer
  • Fluorescence
  • Mass action
  • Microscopy
  • Multiplex
  • Nanotechnology
  • Quantitation
  • Quantum dots
  • Spectroscopy
  • Virus particles

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

The development of quantum dot calibration beads and quantitative multicolor bioassays in flow cytometry and microscopy. / Wu, Yang; Campos, Samuel K; Lopez, Gabriel P.; Ozbun, Michelle A.; Sklar, Larry A.; Buranda, Tione.

In: Analytical Biochemistry, Vol. 364, No. 2, 15.05.2007, p. 180-192.

Research output: Contribution to journalArticle

Wu, Yang ; Campos, Samuel K ; Lopez, Gabriel P. ; Ozbun, Michelle A. ; Sklar, Larry A. ; Buranda, Tione. / The development of quantum dot calibration beads and quantitative multicolor bioassays in flow cytometry and microscopy. In: Analytical Biochemistry. 2007 ; Vol. 364, No. 2. pp. 180-192.
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