Specific detection of DNA using quantum dots and magnetic beads for large volume samples

Yeon Seok Kim, Byoung Chan Kim, Jin Hyung Lee, Jungbae Kim, Man Bock Gu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Here we present a sensitive DNA detection protocol using quantum dots (QDs) and magnetic beads (MBs) for large volume samples. In this study, QDs, conjugated with streptavidin, were used to produce fluorescent signals while magnetic beads (MBs) were used to isolate and concentrate the signals. The presence of target DNAs leads to the sandwich hybridization between the functionalized QDs, the target DNAs and the MBs. In fact, the QDs-MBs complex, which is bound using the target DNA, can be isolated and then concentrated. The binding of the QDs to the surface of the MBs was confirmed by confocal microscopy and Cd elemental analysis. It was found that the fluorescent intensity was proportional to concentration of the target DNA, while the presence of non-complementary DNA produced no significant fluorescent signal. In addition, the presence of low copies of target DNAs such as 0.5 pM in large volume samples up to 40 mL was successfully detected by using a magnet-assisted concentration protocol which consequently results in the enhancement of the sensitivity more than 100-fold.

Original languageEnglish
Pages (from-to)449-454
Number of pages6
JournalBiotechnology and Bioprocess Engineering
Issue number5
Publication statusPublished - 2006 Sept

Bibliographical note

Funding Information:
^ÅâåçïäÉÇÖãÉåí This work was supported by the Korea University Grant (2005-2006).


  • DNA detection
  • Magnet-assisted concentration
  • Magnetic beads
  • Quantum dots

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology
  • Biomedical Engineering


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