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Quantum Dots pp 125-139 | Cite as

Phase Transfer and DNA Functionalization of Quantum Dots Using an Easy-to-Prepare, Low-Cost Zwitterionic Polymer

  • Margaret Chern
  • Chloe Grazon
  • Allison M. DennisEmail author
Protocol
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Part of the Methods in Molecular Biology book series (MIMB, volume 2135)

Abstract

Small, stable, and bright quantum dots (QDs) are of interest in many biosensing and biomedical imaging applications, but current methodologies for obtaining these characteristics can be highly specialized or expensive. We describe a straightforward, low-cost protocol for functionalizing poly(isobutylene-alt-maleic anhydride) (PIMA) with moieties that anchor to the QD surface (histamine), impart hydrophilicity [(2-aminoethyl)trimethylammonium chloride (Me3N+-NH2)], and provide a platform for biofunctionalization via click chemistry (dibenzocyclooctyne (DBCO)). Guidelines to successfully use this polymer for QD ligand exchange are presented, and an example of biofunctionalization with DNA is shown. Stable QD–DNA conjugates are obtained with high yield and without requiring additional purification steps.

Key words

DNA labeling Copper-free click chemistry Biofunctionalization Nanoparticle Carboxybetaine Poly(isobutylene-alt-maleic anhydride)—PIMA 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Authors and Affiliations

  • Margaret Chern
    • 1
  • Chloe Grazon
    • 2
    • 3
  • Allison M. Dennis
    • 1
    • 4
    Email author
  1. 1.Division of Materials Science and EngineeringBoston UniversityBostonUSA
  2. 2.Department of ChemistryBoston UniversityBostonUSA
  3. 3.CNRS, Bordeaux INP, LCPO, UMR 5629University of BordeauxPessacFrance
  4. 4.Department of Biomedical EngineeringBoston UniversityBostonUSA

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