The process described a3ove permits a fast and accurate determination of lanatoside A, lanatoside C, digoxin, digitoxin and digoxigenin even in relatively little purified extracts of dry drugs or extracts o f fresh plants, respectively, by employing the in-situ evaluation of thin-layer chromatograms by measuring the remission at 225 nm. The omission of manipulations in spraying reactions for measurements of fluorescence also results in an improvement of the accuracy of measurement in addition to saving time. The sensitivity to detection also renders it possible to examine very small amounts of drugs for tbeir glycoside contents.
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