Abstract
In the present study an analytical method of high-performance thin-layer chromatography (HPTLC) has been developed for quantification of glycyrrhizin for marketed antistressliquorice root capsules (LRC) and herbal tea (HT). Chromatography was performed by using mobile phase ethyl acetate (EA): glacial acetic acid (GAA): Methanol (MeOH): water (H(2)O) in proportion of 6:2:2:1, v/v/v/v. The developed plate was scanned and quantified densitometrically at absorption maxima 254nm. The method was validated for various analytical parameters viz. precision, accuracy, recovery, robustness, specificity, detection and quantification limits. The developed system was found to give compact spot for glycyrrhizin (R(f)= 0.33± 0.001). The linearity relationship was described by the equation Y=6.841X+ 70.428. The limit of detection (34 ng band(-1)), limit of quantification (101 ng band(-1)), recovery (99.4-99.8%), and precision (<1.84% and <1.62%; intraday and interday, respectively) were found satisfactory for glycyrrhizin. Linearity range for glycyrrhizin was 100-600ng (r(2)=0.998). The amount of glycyrrhizin was estimated by comparing the peak area of standard and the same was present in crude extract. The content of glycyrrhizin was estimated as 11.4% and 4.7% w/w in sample LRC and HT, respectively. The proposed method will be useful to quantify the therapeutic dose of glycyrrhizin in herbal formulations as well as in bulk drug.