Subtaeng S, Kruatian T, Jitpreeda P, Wanitsuwan W. Method validation for determination of mitragynine in Kratom leaf extract by high performance liquid chromatography. Bull Appl Sci. [internet]. 2023 Nov. 24 [cited 2025 Dec. 9];12(2):10-22. available from: https://ph03.tci-thaijo.org/index.php/BAS/article/view/621