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Separation and determination of microRNAs by high‐speed capillary sieving electrophoresis
Author(s) -
Wang Wei,
Cai Xiaoyu,
Lin Ping,
Bai Ruiguang
Publication year - 2018
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201800635
Subject(s) - capillary electrophoresis , chromatography , detection limit , chemistry , electrophoresis , analytical chemistry (journal) , hydroxyethyl cellulose , electrokinetic phenomena , capillary action , micellar electrokinetic chromatography , cellulose , materials science , biochemistry , composite material
In this work, high‐speed capillary sieving electrophoresis with laser‐induced fluorescence detection was applied to simultaneously determine three microRNAs. A developed manual sample introduction device for the high‐speed capillary electrophoresis system was applied to perform sample injection. Strategies, including field‐amplified sample injection and electrokinetic injection, were studied to improve the detection sensitivity. Under the optimal conditions, the limit of detection for DNA‐159 could be lowered to 5.10 × 10 −12 mol/L. In order to achieve enough separation resolution, two DNA probes were designed to have extra sequences that acted as the drag tails. Under the optimized conditions, the three DNA probes and the complexes of microRNA‐156, microRNA‐159, and microRNA‐166 could be completely separated within 3.2 min in background electrolyte (pH 8.7) containing 2.0% m/m polyvinyl pyrrolidone and 0.4% m/m hydroxyethyl cellulose. The limits of detection for the three microRNAs were 0.051, 0.11, and 0.25 nmol/L, respectively. Then the method was applied to analyze the microRNAs spiked in the samples extracted from banana leaves. The recoveries ranged from 114.3 to 121.1% (n = 3). The results showed that the method developed in this work was an effective means for microRNA assay.