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7-Hydroxymitragynine (7-OH) is a terpenoid indole alkaloid from the plant Mitragyna speciosa, commonly known as kratom. [2] It was first described in 1994 [3] and is a human metabolite metabolized from mitragynine present in the Mitragyna speciosa. 7-OH binds to opioid receptors like mitragynine, but research suggests that 7-OH binds with greater efficacy.
In Thai varieties of kratom, mitragynine is the most abundant component (up to 66% of total alkaloids), while 7-hydroxymitragynine (7-OH) is a minor constituent (up to 2% of total alkaloid content). In Malaysian kratom varieties, mitragynine is present at lower concentration (12% of total alkaloids). [ 5 ]
Mitragynine pseudoindoxyl is a μ-opioid receptor agonist and δ-opioid receptor antagonist.It is a G protein biased agonist at the μ-opioid receptor, which may be responsible for its favorable side effect profile compared to conventional opioids. [3]
Mitragyna speciosa is a tropical evergreen tree of the Rubiaceae family (coffee family) native to Southeast Asia. [3] It is indigenous to Cambodia, Thailand, Indonesia, Malaysia, Myanmar, and Papua New Guinea, [4] where its leaves, known as kratom, have been used in herbal medicine since at least the 19th century. [5]
Leaves: Opioids (1–6% mitragynine, 0.01–0.04% 7-hydroxymitragynine [68]) Depressant: In Thailand, kratom was "used as a snack to receive guests and was part of the ritual worship of ancestors and gods." (Saingam et al.) [69] Opium, Opium poppy: Papaver somniferum: Latex exudate: [70] morphine 0.3–25% and codeine 0.5–4% Depressant
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