Solvent-assisted optical modulation of FRET-induced fluorescence for efficient conjugated polymer-based DNA detection

Mijeong Kang, Okhil Kumar Nag, Sungu Hwang, Inhong Kim, Haesik Yang, Kwangseuk Kyhm, Han Young Woo

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The solvent effects were studied in fluorescence resonance energy transfer (FRET) from a cationic polyfluorene copolymer (FHQ, FPQ) to a fluorescein (Fl)-labelled oligonucleotide (ssDNA-Fl). Upon addition of dimethyl sulfoxide (DMSO), the optical properties of polymers and the probe dye were substantially modified and the FRET-induced PL signal was enhanced 3.8-37 times, relative to that in phosphate buffer solution (PBS). The hydrophobic interaction between polymers and ssDNA-Fl is expected to decrease in the presence of DMSO, which induces the weaker polymer/ssDNA-Fl complexation with longer intermolecular donor-acceptor separation and perturbs the competition between the FRET and PL quenching processes such as photo-induced charge transfer. The gradual decrease in Fl PL quenching with increasing the DMSO content was investigated by measuring the Stern-Volmer quenching constants (3.3-4.2 × 10 6 M -1 in PBS, 0.56-1.1 × 10 6 M -1 in 80 vol% DMSO) and PL lifetime of the excited Fl* in polymer/ssDNA-Fl (600 ps in PBS and 2120 ps in 80 vol% DMSO for FHQ/ssDNA-Fl) in PBS/DMSO mixtures. The substantially reduced PL quenching would amplify the resulting FRET Fl signal. The signal amplification in real DNA detection was also demonstrated with fluorescein-labelled PNA (probe PNA) in the presence of a complementary target DNA and noncomplementary DNA in aqueous DMSO solutions. This approach suggests a simple way of modifying the fine-structure of polymer/ssDNA-Fl and improving the detection sensitivity in conjugated polymer-based FRET bioassays.

Original languageEnglish
Pages (from-to)15482-15489
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume12
Issue number47
DOIs
Publication statusPublished - 2010 Dec 21
Externally publishedYes

Fingerprint

Fluorescence Resonance Energy Transfer
Light modulation
light modulation
Conjugated polymers
resonance fluorescence
Fluorescein
Polymers
deoxyribonucleic acid
Fluorescence
energy transfer
Dimethyl Sulfoxide
fluorescence
DNA
phosphates
polymers
buffers
quenching
Quenching
Buffers
Phosphates

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Solvent-assisted optical modulation of FRET-induced fluorescence for efficient conjugated polymer-based DNA detection. / Kang, Mijeong; Nag, Okhil Kumar; Hwang, Sungu; Kim, Inhong; Yang, Haesik; Kyhm, Kwangseuk; Woo, Han Young.

In: Physical Chemistry Chemical Physics, Vol. 12, No. 47, 21.12.2010, p. 15482-15489.

Research output: Contribution to journalArticle

Kang, Mijeong ; Nag, Okhil Kumar ; Hwang, Sungu ; Kim, Inhong ; Yang, Haesik ; Kyhm, Kwangseuk ; Woo, Han Young. / Solvent-assisted optical modulation of FRET-induced fluorescence for efficient conjugated polymer-based DNA detection. In: Physical Chemistry Chemical Physics. 2010 ; Vol. 12, No. 47. pp. 15482-15489.
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