A new thin-layer densitometric technique for the assay of cardenolides from Digitalis purpurea

Cardenolides content in wild Sardinian Digitalis purpurea L. populations

In order to quantify the amounts of digitoxigenin and gitoxigenin in wild Sardinian Digitalis purpurea L. an easy extraction method and an high performance liquid chromatography (HPLC) analytical technique have been set up. The analyzed samples, stemming from six different locations, showed a great variability in glycoside content. The HPLC analyses carried out on 2-year-old plants of D. purpurea showed that the amounts of digitoxigenin and gitoxigenin ranged between 11.34 and 240.59 mg kg(-1) and 4.05 and 178.07 mg kg(-1), respectively, calculated on fresh material. Chemometric analyses, carried out considering different morphological characters, showed that correlations between morphological variations and glycoside content are poor.

High-performance liquid chromatographic analysis of digitoxin formulations

A rapid, selective, and simple high-performance liquid chromatographic assay for digitoxin formulations is described. The method utilizes a conventional octadecyl-bonded phase column with detection at 220 nm. The isocratic solvent system resolves digitoxin from its potential degradation products and provides an accurate assay for tablet and injectable formulations with a relative standard deviation of 1.4 and 3.3%, respectively. The method is sufficiently sensitive to monitor content uniformity of tablets and the minimum quantifiable amount of digitoxin was determined to be 20 ng. The total chromatograph time was approximately 15 min.

High-performance liquid chromatographic analysis of digoxin formulations

A rapid, selective, and simple high-performance liquid chromatographic (HPLC) assay for digoxin formulations is described. The method utilizes a conventional octadecyl bonded phase column with detection at 220 nm. The analytical procedure has been applied for the quantitation of digoxin in tablets, elixir, and injectable formulations with a resulting relative standard deviation of 1.45, 1.70, and 1.80%, respectively. The method is sufficiently sensitive to monitor content uniformity of individual tablets. Potential impurities or degradation products are resolved from the digoxin peak in a total chromatographic time of less than 15 min.