treatment of pain and opioid addiction. For standardization and quality control of raw and
commercial kratom products, an ultra‐performance liquid chromatography− tandem mass
spectrometry (UPLC− MS/MS) method was developed and validated for the quantification of
ten key alkaloids, namely: corynantheidine, corynoxine, corynoxine B, 7‐
hydroxymitragynine, isocorynantheidine, mitragynine, mitraphylline, paynantheine …