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- W1977014561 abstract "Scanning temperature gradient focusing (TGF) is a recently described technique for the simultaneous concentration and separation of charged analytes. It allows for high analyte peak capacities and low LODs in microcolumn electrophoretic separations. In this paper, we present the application of scanning TGF for chiral separations of amino acids. Using a mixture of seven carboxyfluorescein succinimidyl ester-labeled amino acids (including five chiral amino acids) which constitute the Mars7 standard, we show that scanning TGF is a very simple and efficient method for chiral separations. The modulation of TGF separation parameters (temperature window, pressure scan rate, temperature range, and chiral selector concentration) allows optimization of peak efficiencies and analyte resolutions. The use of hydroxypropyl-β-CD at low concentration (1–5 mmol/L) as a chiral selector, with an appropriate pressure scan rate ( −0.25 Pa/s) and with a low temperature range (3–25°C over 1 cm) provided high resolution between enantiomers (Rs >1.5 for each pair of enantiomers) using a short, 4 cm long capillary. With these new results, the scanning TGF method appears to be a viable method for in situ trace biomarker analysis for future missions to Mars or other solar system bodies." @default.
- W1977014561 created "2016-06-24" @default.
- W1977014561 creator A5027494956 @default.
- W1977014561 creator A5034479918 @default.
- W1977014561 date "2008-08-01" @default.
- W1977014561 modified "2023-10-16" @default.
- W1977014561 title "Development of a temperature gradient focusing method for in situ extraterrestrial biomarker analysis" @default.
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- W1977014561 doi "https://doi.org/10.1002/elps.200700778" @default.
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