Microchimica Acta

, 186:80 | Cite as

Gold-decorated magnetic nanoparticles modified with hairpin-shaped DNA for fluorometric discrimination of single-base mismatch DNA

  • Mei-Hwa Lee
  • Ching-Chich Leu
  • Cheng-Chih Lin
  • Yu-Fan Tseng
  • Hung-Yin LinEmail author
  • Chia-Ning YangEmail author
Original Paper


The authors describe the use of gold-decorated magnetic nanoparticles (Au/MNPs) in discriminating DNA sequences with a single-base (guanine) mismatch. The Au/MNPs were characterized through dynamic light scattering, X-ray diffraction, superconducting quantum interference device, and UV/visible spectroscopy. They were then conjugated to a probe oligomer consisting of a hairpin-shaped DNA sequence carrying two signalling fluorophores: fluorescein at its 3′ end and pyrene in the loop region. When interacting with the target DNA sequences, the hybridized probe–target duplex renders the pyrene signal (at excitation/emission wavelengths of 345/375 nm) either quenched or unquenched. Quenching (or nonquenching) of the pyrene fluorescence depends on the presence of a guanine (or a nonguanine) nucleotide at the designated polymorphic site. The linear range of hybridization in these Au/MNPs is from 0.1 nM to 1.0 μM of ssDNA. Conceivably, this system may serve as a single-nucleotide polymorphism probe.

Graphical Abstract

Schematic presentation of probe-conjugated Au/MNP preparation (upper panel) and working principle to discriminate DNA with or without single-base (guanine) mismatch sequences at the polymorphic sites (lower panel). Py denotes pyrene-hooked pyrrolocytidine; F denotes fluorescein.


Gold-decorated magnetic nanoparticles DNA sequences Single-base mismatch 



The authors thank the Ministry of Science and Technology, Taiwan (grant nos. MOST 106-2314-B-390-001-MY2, MOST 104-2113-M-002-019-MY2, and MOST 104-2113-M-390-003) and Armed Forces Zuoying General Hospital (grant no. ZBH 105-03) for their support.

Supplementary material

604_2018_3192_MOESM1_ESM.doc (908 kb)
ESM 1 (DOC 908 kb)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringI-Shou UniversityKaohsiungTaiwan
  2. 2.Department of Chemical and Materials EngineeringNational University of KaohsiungKaohsiungTaiwan
  3. 3.Division of Pulmonary Medicine, Department of Internal MedicineArmed-Forces Zuoying General HospitalKaohsiungTaiwan
  4. 4.Department of Chemical and Materials EngineeringNational University of KaohsiungKaohsiungTaiwan
  5. 5.Department of Life SciencesNational University of KaohsiungKaohsiungTaiwan
  6. 6.Department of Life SciencesNational University of KaohsiungKaohsiungTaiwan

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