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Table 1 Validation parameters for ephedrine, glycyrrhizic acid and amygdalin by high performance liquid chromatography

From: Antitussive, anti-pyretic and toxicological evaluation of Ma-Xing-Gan-Shi-Tang in rodents

Compound Concentration range (μg/mL) R2 Linear regression Intra-D (%) Inter-D (%)
Ephedrine 6.25–100 0.997 Y = 0.454x-0.0356 1.00–2.74 0.98–3.02
Glycyrrhizic acid 6.25–100 0.999 Y = 0.052x + 0.0046 0.34–3.76 0.62–2.84
Amygdalin 6.25–100 0.990 Y = 0.0645x + 0.0788 1.61–4.33 1.48–3.67
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