Linker-protein G mediated functionalization of polystyrene-encapsulated upconversion nanoparticles for rapid gene assay using convective PCR

Phani R. Potluri, Vinoth Kumar Rajendran, Clara T. Tran, David R. McKenzie, Anwar Sunna

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The authors report on a simplified approach to encapsulate upconversion nanoparticles (UCNPs) in polystyrene spheres by mini-emulsion polymerisation. The resulting particles (PS-UCNP) are hydrophilic, stable and suitable for biomolecular recognition and biosensing applications. Also, a strategy was developed for bioconjugation of antibodies onto the surface of the PS-UCNPs by using the bifunctional fusion protein linker-protein G (LPG). LPG mediates the functionalisation of PS-UCNPs with antibodies against digoxigenin allowing for specific labelling of convective PCR (cPCR) amplicons. Lambda DNA was amplified using cPCR on a heat block for 30 min using the digoxigenin labelled forward and biotin labelled reverse primers. The antibody functionalised PS-UCNPs bind to the digoxigenin end of the cPCR amplicons. Finally, the streptavidin labelled magnetic beads were used to selectively capture the PS-UCNP-labelled cPCR amplicons and the upconversion signal was detected at 537 nm under 980 nm excitation. This sandwich approach enables direct recognition of the target lambda DNA with a detection limit of 103 copies μL−1. The upconversion signal decreased proportionally to the concentration of the lambda DNA with a linear response between 107 and 103 copies of DNA.
LanguageEnglish
Article number346
Pages1-9
Number of pages9
JournalMicrochimica Acta
Volume186
Issue number6
DOIs
Publication statusPublished - Jun 2019

Fingerprint

Polystyrenes
Assays
Genes
Nanoparticles
Digoxigenin
Proteins
DNA
Antibodies
Streptavidin
Emulsion polymerization
Biotin
Labeling
Fusion reactions

Keywords

  • Amplification
  • Bioconjugation
  • Nucleic acid analysis
  • Mini-emulsion polymerisation
  • Surface functionalisation
  • Magnetic separation
  • Biosensing
  • Luminescence
  • Lanthanide-doped

Cite this

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title = "Linker-protein G mediated functionalization of polystyrene-encapsulated upconversion nanoparticles for rapid gene assay using convective PCR",
abstract = "The authors report on a simplified approach to encapsulate upconversion nanoparticles (UCNPs) in polystyrene spheres by mini-emulsion polymerisation. The resulting particles (PS-UCNP) are hydrophilic, stable and suitable for biomolecular recognition and biosensing applications. Also, a strategy was developed for bioconjugation of antibodies onto the surface of the PS-UCNPs by using the bifunctional fusion protein linker-protein G (LPG). LPG mediates the functionalisation of PS-UCNPs with antibodies against digoxigenin allowing for specific labelling of convective PCR (cPCR) amplicons. Lambda DNA was amplified using cPCR on a heat block for 30 min using the digoxigenin labelled forward and biotin labelled reverse primers. The antibody functionalised PS-UCNPs bind to the digoxigenin end of the cPCR amplicons. Finally, the streptavidin labelled magnetic beads were used to selectively capture the PS-UCNP-labelled cPCR amplicons and the upconversion signal was detected at 537 nm under 980 nm excitation. This sandwich approach enables direct recognition of the target lambda DNA with a detection limit of 103 copies μL−1. The upconversion signal decreased proportionally to the concentration of the lambda DNA with a linear response between 107 and 103 copies of DNA.",
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Linker-protein G mediated functionalization of polystyrene-encapsulated upconversion nanoparticles for rapid gene assay using convective PCR. / Potluri, Phani R.; Rajendran, Vinoth Kumar; Tran, Clara T.; McKenzie, David R.; Sunna, Anwar.

In: Microchimica Acta, Vol. 186, No. 6, 346, 06.2019, p. 1-9.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Linker-protein G mediated functionalization of polystyrene-encapsulated upconversion nanoparticles for rapid gene assay using convective PCR

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AU - Rajendran, Vinoth Kumar

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AU - McKenzie, David R.

AU - Sunna, Anwar

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