Single-molecule Analysis Enables Free Solution Hydrodynamic Separation Using Yoctomole Levels of DNA

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2011 Apr 21

PMID 21504160

Citations 14

Authors

Kelvin J Liu

Tushar D Rane

Yi Zhang

Tza-Huei Wang

Affiliations

Soon will be listed here.

Abstract

Single-molecule free solution hydrodynamic separation (SML-FSHS) cohesively integrates cylindrical illumination confocal spectroscopy with free solution hydrodynamic separation. This technique enables single-molecule analysis of size separated DNA with 100% mass detection efficiency, high sizing resolution and wide dynamic range, surpassing the performance of single molecule capillary electrophoresis. Furthermore, SML-FSHS required only a bare fused silica microcapillary and simple pressure control rather than complex high voltage power supplies, sieving matrices, and wall coatings. The wide dynamic range and high sizing resolution of SML-FSHS was demonstrated by separating both large DNA (23 vs 27 kbp) and small DNA (100 vs 200 bp) under identical conditions. Separations were successfully performed with near zero sample consumption using as little as 5 pL of sample and 240 yoctomoles (∼150 molecules) of DNA. Quantitative accuracy was predominantly limited by molecular shot noise. Furthermore, the ability of this method to analyze of single molecule nanosensors was investigated. SML-FSHS was used to examine the thermodynamic equilibrium between stochastically open molecular beacon and target-bound molecular beacon in the detection of E. coli 16s rRNA targets.

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