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High-performance thin layer chromatography profile of Plantago major extracts. Solvent system (a) toluene: acetone: formic acid (78:22:0.15) and (b) 1,4 dioxane: xylene: propan-2-ol: 12.5% NH3 (1:2:5:2). L1, P1, R1, and S1 are methanol extracts of leaves, petioles, roots, and seeds of Plantago major from Lumajang, respectively. A1 is methanol extract of aerial part of Plantago major from Tawangmangu. St1 and St2 are ursolic acid-oleanolic acid and aucubin (AUC) standard, respectively
