Ultrafast Gradient Separation with Narrow Open Tubular Liquid Chromatography.
Piliang XiangYu YangZhitao ZhaoMing-Li ChenShao-Rong LiuPublished in: Analytical chemistry (2019)
Separation speed and resolution are two important figures of merit in chromatography. Often, one gains the speed at the cost of the resolution, and vice versa. Scientists have employed short-packed columns for ultrafast separations but encountered challenges such as limited mobile phase velocity, extra-column effect caused band broadening, and column packing difficulty. We have recently demonstrated ultrahigh resolutions of narrow open tubular liquid chromatography (NOTLC); this allows us to trade some of the resolution for speed. In this work, we explored NOTLC for ultrafast LC separations. We used a 2.7 cm (effective length) narrow open tubular (NOT) column and showed a baseline separation of 6 amino acids in less than 700 ms. Ways to further increase the speed were discussed. Using short narrow open tubular (NOT) columns to perform ultrafast separation we overcame the challenges from using short packed columns. To demonstrate the feasibility of using this ultrafast separation technique for practical applications, we separated complex protein digests; peptides were nicely resolved in ∼1 min.
Keyphrases
- liquid chromatography
- mass spectrometry
- high resolution mass spectrometry
- tandem mass spectrometry
- minimally invasive
- simultaneous determination
- capillary electrophoresis
- energy transfer
- amino acid
- solid phase extraction
- high performance liquid chromatography
- electron transfer
- single molecule
- gas chromatography
- high glucose
- high resolution
- multiple sclerosis
- endothelial cells