Abstract
Compared with liquid chromatography and capillary electrophoresis, the diversity of gas chromatography chiral stationary phases is rather limited. Here, we report the fabrication of Co(d-Cam)1/2(bdc)1/2(tmdpy) (d-Cam = d-camphoric acid; bdc = 1,4-benzenedicarboxylate; tmdpy = 4,4′-trimethylenedipyridine)-coated open tubular columns for high-resolution gas chromatographic separation of compounds. The Co(d-Cam)1/2(bdc)1/2(tmdpy) compound possesses a 3-D framework containing enantiopure building blocks embedded in intrinsically chiral topological nets. In this study, two fused-silica open tubular columns with different inner diameters and lengths, including column A (30 m × 530 μm i.d.) and column B (2 m × 75 μm i.d.), were prepared by a dynamic coating method using Co-(d-Cam)1/2(bdc)1/2(tmdpy) as the stationary phase. The chromatographic properties of the two columns were investigated using n-dodecane as the test compound at 120 °C. The number of theoretical plates (plates/m) of the two metal–organic framework columns was 1,450 and 3,100, respectively. The separation properties were evaluated using racemates, isomers, alkanes, alcohols, and Grob's test mixture. The limit of detection and limit of quantification were found to be 0.125 and 0.417 ng for citronellal enantiomers, respectively. Repeatability (n = 6) showed lower than 0.25 % relative standard deviation (RSD) for retention times and lower than 2.2 % RSD for corrected peak areas. The experimental results showed that the stationary phase has excellent selectivity and also possesses good recognition ability toward these organic compounds, especially chiral compounds.
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Acknowledgments
This work was supported by the National Science Foundation (no. 21075109, no. 21127012) and the National Basic Research Program (no. 2011CB612312) of China.
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Xie, SM., Zhang, XH., Zhang, ZJ. et al. A 3-D open-framework material with intrinsic chiral topology used as a stationary phase in gas chromatography. Anal Bioanal Chem 405, 3407–3412 (2013). https://doi.org/10.1007/s00216-013-6714-7
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DOI: https://doi.org/10.1007/s00216-013-6714-7