Thin-layer chromatography of cardenolides in the presence of boric acid

Szeleczky, Z.

doi:10.1016/s0021-9673(00)92504-4

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1992

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Cited by 13 publications

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High performance thin layer chromatography—densitometric method for content uniformity test of lanatoside C tablets

Hagiwara

Shigeoka

Uehara

et al. 1984

J. High Resol. Chromatogr.

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1 a471 11 a472 ~~ A few years ago two phases were described which are obtained by derivatization with 2,4-dinitroaniline [lo] and picramine [ l 11.Comparison of capacity factors with those obtained on the 3,5-dinitrobenzamide groups reveals a longer retention, time.This demonstrates that the amido group increases the acceptor strength ofthe nitrogroups,whereasthe aminogroupsaredonors and therefore decrease the strength of the nitro groups. We found the same result with picryl ethers [12] in which the methoxy group decreases the acceptor strength. It appears, however, to be better than the commercial nitro silica gel which is a p-nitropropylbenzene silica gel.

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