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J Thai Trad Alt Med Vol. 21 No. 2 May-Aug 2023 423
Figure 2 Chromatographic fingerprint of Mitragyna speciosa leaf extract was obtained using different mobile
phases. (A) represents a mixture of water and acetonitrile, while (B) represents a combination of
0.1% ortho-phosphoric acid in water and 0.1% ortho-phosphoric acid in acetonitrile
Figure 3 UV spectrum of mitragynine
