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Lipid-Based Passivation in Nanofluidics

Fredrik Persson ; J. Fritzsche ; K. U. Mir ; M. Modesti ; Fredrik Westerlund (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Jonas O. Tegenfeldt
Nano Letters (1530-6984). Vol. 12 (2012), 5, p. 2260-2265.
[Artikel, refereegranskad vetenskaplig]

Stretching DNA in nanochannels is a useful tool for direct, visual studies of genomic DNA at the single molecule level. To facilitate the study of the interaction of linear DNA with proteins in nanochannels, we have implemented a highly effective passivation scheme based on lipid bilayers. We demonstrate virtually complete long-term passivation of nanochannel surfaces to a range of relevant reagents, including streptavidin-coated quantum dots, RecA proteins, and RecA-DNA complexes. We show that the performance of the lipid bilayer is significantly better than that of standard bovine serum albumin-based passivation. Finally, we show how the passivated devices allow us to monitor single DNA cleavage events during enzymatic degradation by DNase I. We expect that our approach will open up for detailed, systematic studies of a wide range of protein-DNA interactions with high spatial and temporal resolution.

Nyckelord: Nanofluidics; passivation; antifouling; lipid bilayer; protein−DNA interactions; single molecules



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Denna post skapades 2012-06-05. Senast ändrad 2016-05-18.
CPL Pubid: 158573

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Livsvetenskaper
Nanovetenskap och nanoteknik
NATURVETENSKAP
TEKNIK OCH TEKNOLOGIER

Chalmers infrastruktur