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HPLC method validation for Digitalis and its analogue by pulsed amperometric detection.

Ha-Jeong Kwon¹, Hee-Jung Sim, Sa-im Lee

¹Department of Preventive and Social Dentistry, Graduate School, Kyung Hee University, Hoegi-dong, Dongdaemoon-gu, Seoul 130-701, South Korea.

Journal of Pharmaceutical and Biomedical Analysis

|August 31, 2010

Summary

A new reversed-phase HPLC-pulsed amperometric detection (RP-HPLC-PAD) method offers sensitive and selective detection of cardiac glycosides. This validated method accurately quantifies cardiac glycosides in Digitalis purpurea.

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Area of Science:

Analytical Chemistry
Pharmacognosy

Background:

Cardiac glycosides are vital compounds with significant therapeutic and toxicological implications.
Accurate quantification of cardiac glycosides is crucial for pharmaceutical development and quality control.

Purpose of the Study:

To develop and validate a highly sensitive and selective analytical method for cardiac glycoside detection.
To quantify specific cardiac glycosides in Digitalis purpurea.

Main Methods:

Development of a reversed-phase High-Performance Liquid Chromatography-Pulsed Amperometric Detection (RP-HPLC-PAD) method.
Separation of eight cardiac glycosides using a water-acetonitrile gradient on a reversed-phase column.
Detection using PAD under alkaline conditions (NaOH).

Main Results:

Complete separation of eight cardiac glycosides within 45 minutes.
Achieved low detection limits (0.1-0.3 ng) and quantification limits (0.3-0.8 ng).
Demonstrated high linearity (R²=0.9962-0.9998), precision (<9.30% RSD), and recovery (98.63-99.94%) in Digitalis purpurea leaf extracts.

Conclusions:

The developed RP-HPLC-PAD method is precise and accurate for cardiac glycoside analysis.
The method enables reliable quantification of key cardiac glycosides in Digitalis purpurea.
This technique supports the quality assessment of herbal medicines containing cardiac glycosides.