Dalairo is a low undershrub. Leaves are oblong, 7 to 15 centimeters long, 3 to 5 centimeters wide, smooth, and obtuse at the ends. Flower is solitary, leaf-opposed, and about 2 centimeters in diameter. Sepals are ovate, and the petals ovate or oblong. Fruit is clavate, and 3 to 4 centimeters long. Seeds are shining, black, and obovoid.
- In forests chiefly at medium altitudes, locally abundant in Bataan, Laguna, Cavite, Batangas, and Camarines Provinces in Luzon; and in Mindoro; Biliran; Leyte; Negros; and Mindanao.
- Also occurs in Ceylon, Burma, Sumatra, the Malay Peninsula, Indo-China, and Java.
Study yielded prenylflavonoids.
Considered tonic, stomachic, antipyretic.
Fresh leaves used as topicals for articular rheumatism.
• Erectile dysfunction: Marketed as: (1) blood tonic and muscle strengthening properties. (2) as herbal supplement for erectily dysfunction or impotence problems.
• Constituents / Antioxidant: (1) Study of the bark of A. luzonensis yielded five new xanthones and one new flavonoid, along with seven known xanthones and seven known flavonoids. Almost all the flavonoids and one xanthone showed antioxidant activity. Compound 6, new flavonoid (3,5,7,49-tetrahydroxy-29-methoxyflavone), scavenged the DPPH radical to the same degree as a-tocopherol. (2) A new flavonoid, 3,5,7,4'-tetrahydroxy-2'-methoxyflavone, isolated on autoxidation of epinephrine Hcl exhibited an effective antioxidant potency.
• Vasorelaxant / Antioxidant: Study of dichloromethane extract of Anaxagorea luzonensis showed concentration-dependent vasorelaxations. Results in the rat isolated aorta showed vasorelaxant responses, in part, mediated via the endothelium and NO-dependent pathways. Results provide evidence to support it use as a vasodilator agent.
• Tyrosinase Inhibition / Antioxidant: Study showed anti-tyrosinase activity and scavenging activity toward DPPH assay. Results demonstrate potential pharmaceutical and cosmetic applications.
• Prenylflavonoids / Antioxidant: Study isolated 8-isopentenylnaringenin that exhibited an estrogen agonist activity at an order greater than genistein.
• Prenylflavonoids / Antioxidant: Study isolated 8-iso
Capsules in the cybermarket; marketed for erectile dysfunction.