Summary
Extracts of four umbelliferous plants containing coumarins and furocoumarins were chromatographed in sandwich chambers with a glass distributor. best separations were obtained for stepwise gradient elution in the concentration range of 2.5 to 15% ethyl acetate in chloroform. Seven eluent fractions with increasing ethyl acetate concentrations were introduced directly under the distributor of the sandwich chamber.
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Glowniak, K., Matysik, G., Bieganowska, M. et al. Gradient thin-layer chromatography of coumarins and furocoumarins. Chromatographia 22, 307–310 (1986). https://doi.org/10.1007/BF02268780
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DOI: https://doi.org/10.1007/BF02268780