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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Compact Quantum Dots for Single-molecule Imaging
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High-conjugation-efficiency aqueous CdSe quantum dots.

Giang H T Au1, Wan Y Shih, Wei-Heng Shih

  • 1School of Biomedical Engineering, Science and Health Systems, Drexel University, 3141 Chestnut Street, Bossone 718, Philadelphia, PA 19104, USA. gha23@drexel.edu.

The Analyst
|October 24, 2013
PubMed
Summary
This summary is machine-generated.

Aqueous quantum dots (AQDs) offer superior streptavidin conjugation efficiency (75%) compared to organic quantum dots (OQDs, 3.4%) for enhanced bio-imaging. AQDs also demonstrate improved stability in cell culture media.

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Production and Targeting of Monovalent Quantum Dots
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Area of Science:

  • Nanotechnology
  • Bioconjugation
  • Cellular Imaging

Background:

  • Quantum dots (QDs) are photoluminescent nanoparticles used for biomolecular imaging.
  • Traditional organic solvent-synthesized QDs (OQDs) require complex ligand exchange processes.
  • Aqueous quantum dots (AQDs) offer a simpler, room-temperature aqueous synthesis route.

Purpose of the Study:

  • To synthesize Cadmium Selenide (CdSe) AQDs using 3-mercaptopropionic acid (MPA).
  • To compare the conjugation efficiency and imaging efficacy of AQDs versus commercial OQDs.
  • To evaluate the stability of QD-streptavidin conjugates in cell culture conditions.

Main Methods:

  • Synthesis of CdSe AQDs at room temperature in an aqueous environment.
  • Conjugation of streptavidin (SA) to both AQDs and commercial carboxylated OQDs.
  • Assessment of conjugation efficiency and imaging in HT29 colon cancer cells using a sandwich assay.

Main Results:

  • AQDs achieved a 75% SA conjugation efficiency at an SA/AQD ratio of 4.
  • Commercial OQDs required an SA/OQD ratio of 80 for comparable imaging, yielding only 3.4% SA conjugation efficiency.
  • SA-AQD conjugates remained stable in cell culture medium for over three days, unlike aggregated SA-OQD conjugates.

Conclusions:

  • Direct aqueous synthesis yields AQDs with significantly higher streptavidin conjugation efficiency (>10x) than OQDs.
  • The increased capping molecules on AQDs enhance conjugation and conjugate stability.
  • AQDs present a more efficient and stable alternative for antibody-based bio-imaging applications.