A1 Journal article – refereed
Photochemical Ligation to Ultrasensitive DNA Detection with Upconverting Nanoparticles

List of Authors: Diego Mendez-Gonzalez, Satu Lahtinen, Marco Laurenti, Enrique López-Cabarcos, Jorge Rubio-Retama, Tero Soukka
Publication year: 2018
Journal: Analytical Chemistry
Journal name in source: ANALYTICAL CHEMISTRY
Journal acronym: ANAL CHEM
Volume number: 90
Issue number: 22
Number of pages: 8
ISSN: 0003-2700
eISSN: 1520-6882

In this work, we explore a photochemical ligation reaction to covalently modify oligonucleotide-conjugated upconverting nanoparticles (UCNPs) in the presence of a specific target DNA sequence. The target sequence acts as a hybridization template, bringing together a biotinylated photoactivatable oligonucleotide probe and the oligonucleotide probe that is attached to UCNPs. The illumination of the UCNPs by NIR light to generate UV emission internally or illuminating the photoactivatable probe directly by an external UV light promotes the photochemical ligation reaction, yielding covalently biotin functionalized UCNPs that can be selectively captured in streptavidin-coated microwells. Following this strategy, we developed a DNA sensor with a limit of detection of 1 x 10(-18) mol per well (20 fM). In addition, we demonstrate the possibility to create UCNP patterns on the surface of solid supports upon NIR illumination that are selectively formed under the presence of the target oligonucleotide.

Last updated on 2019-29-01 at 17:14