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. 2019 Sep 12;5(9):e02453. doi: 10.1016/j.heliyon.2019.e02453

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© 2019 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 4 — HPTLC fingerprint (caffeine) of herbal samples after development under UV 254 nm. 1–4: chemical reference caffeine in different volumes (5–20 μL); 5: the RCM-107 formula in methanol; 6: the RCM-107 formula in ethanol; 7: green tea sample; 8: Lotus leaf sample.