Publication: Thiolated pyrrolidinyl peptide nucleic acids for the detection of DNA hybridization using surface plasmon resonance
Issued Date
2009-08-15
Resource Type
ISSN
09565663
Other identifier(s)
2-s2.0-67650046203
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Biosensors and Bioelectronics. Vol.24, No.12 (2009), 3544-3549
Suggested Citation
Cheeraporn Ananthanawat, Tirayut Vilaivan, Wanwimon Mekboonsonglarp, Voravee P. Hoven Thiolated pyrrolidinyl peptide nucleic acids for the detection of DNA hybridization using surface plasmon resonance. Biosensors and Bioelectronics. Vol.24, No.12 (2009), 3544-3549. doi:10.1016/j.bios.2009.05.011 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/27161
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Thiolated pyrrolidinyl peptide nucleic acids for the detection of DNA hybridization using surface plasmon resonance
Other Contributor(s)
Abstract
Thiolated pyrrolidinyl peptide nucleic acids (HS-PNAs) bearing d-prolyl-2-aminocyclopentanecarboxylic acid (ACPC) backbones with different lengths and types of thiol modifiers were synthesized and then characterized by MALDI-TOF mass spectrometry. These HS-PNAs were immobilized on gold-coated glass by self-assembled monolayer (SAM) formation via S atom linkage for the detection of DNA hybridization using surface plasmon resonance (SPR). The amount and the stability of the immobilized HS-PNAs, as well as the effects of spacer and blocking thiol on DNA hybridization efficiency, were determined. SPR results indicated that the hybridization efficiency was enhanced when the distance between the PNA portion and the thiol terminal was increased and/or when blocking thiol was used following the HS-PNA immobilization. The immobilized HS-PNA could discriminate between fully complementary DNA from one or two base mismatched DNA with a relatively high degree of mismatch discrimination (>45%) in PBS buffer at 25 °C. The lowest DNA concentration at which reliable discrimination between fully complementary and single mismatched DNA could still occur was at about 0.2 μM, which is equivalent to 10 pmol of DNA. This research demonstrates that using these novel thiolated PNAs in combination with the SPR technique offers a direct, rapid and non-label based method that could potentially be applied for the analysis of genomic or PCR-amplified DNA in the future. © 2009 Elsevier B.V. All rights reserved.