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A BSTRACT Derris scandens , Albizia procera , and Diospyros rhodocalyx have traditionally been used as herbal remedies for pain relief in Thailand. The ethanolic extracts of these plants obtained by Soxhlet extraction were analyzed by the developed high-performance liquid chromatography-diode-array detection method. Lupeol, the anti-inflammatory triterpene, was selected as a chemical marker for this investigation. All extracts together with that compound were further evaluated for their potential on anti-inflammatory activity using 5-lipoxygenase inhibition assay. Lupeol in each extract was quantified and expressed in the range of 21.44 ± 0.89–40.72 ± 0.40 mg per 100 g of crude drug and the enzyme inhibitory activity of all tested extracts presented as half-maximal inhibitory concentration values ranged between 63.71 ± 2.09 and 91.09 ± 1.40 μg/mL. This study shows that the developed analytical method is effective for analyzing triterpene lupeol in these plants and also reveals the relationship between a lupeol content and the anti-inflammatory effect.

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Introduction: Ha-Rak is an herbal recipe that has been stated by Ministry of Public Health, Thailand to utilize as the herbal medicines for the treatment of fever. The recipe comprises the roots of five plants including Capparis micracantha, Clerodendrum indicum, Ficus racemosa, Harrisonia perforata and Tiliacora triandra as its ingredients. Methods: The extracts of Ha-Rak and its five herbal principles were evaluated for their potential on the cytotoxicity against SW620 cancer cell lines using the MTT assay and an active compound, lupeol which was found as a cytotoxic compound in the herbal ingredients of Ha-Rak was further determined. A chromatographic method for investigating that compound in the extracts was developed herein. The analytical method comprised a cholesterol-coated C18 column, a mixture of acetonitrile and methanol (70:30) with a flow rate of 2 mL/min, and a diode-array UV wavelength at 210 nm as a stationary phase, mobile phase, and detector, respectively. Results: The amount of lupeol in the extracts of Ha-Rak and the herbal principles, which possessed cytotoxicity against SW620 cell lines with the IC 50 values of 30.10-212.24 µg/mL displayed variously in the range of 4.50-250.62 mg/100g. The difference of the contents among the extracts was noted significantly (P < 0.05). The correlation between the lupeol contents and their cytotoxic performances on the tested cell lines was observed in our investigation. Conclusion: Our findings demonstrated that Ha-Rak recipe contains a promising cytotoxic compound, lupeol and it will support the recipe to subject further pharmacological studies on anticancer activity.