Bayog is a tree that grows to a height of 4 to 10 meters. Leaves are oblong to oblong-obovate, 15 to 25 centimeters long, abruptly pointed at the apex, broad or heart-shaped at the base. Upper surface of the blade is smooth, the lower surface pale and densely hairy. Flowers are white, 12 to 14 centimeters long, borne singly or in pairs in the axils of the leaves. Fruit is woody, oblong, five-angled capsule, about 15 centimeters in length.
- Common in forests at low and medium altitudes from Cagayan to Camarines Provinces in Luzon; and in Mindoro, Palawan, Ticao, Masbate, Guimaras, Negros, Mindanao and Basilan.
- Also occurs in Indo-China, the Malay Peninsula, Sumatra, Borneo, Java, and the Moluccas.
- Phytochemical analysis revealed saponins, phenols, flavonoids, tannins, glycosides, terpenes, and alkaloids.
- Flowers considered laxative, anthelmintic, stomachic.
- Studies have suggested antioxidant, antiulcer, anti-inflammatory, analgesic, hypoglycemic and anthelmintic properties.
- Bark and flowers, charred and mixed with the glands of Mallotus philippensis, used in smallpox to induce suppuration.
- Flowers used in inflammation, ulcers, and leprosy.
- In India, plants used for treatment of diabetes, and as hemostatic and anti-inflammatory.
- In Ayurveda, flowers mixed with sugars applied locally as anticancer treatment.
- Flowers made into paste with rice water used as application for hemicranias.
• Dye: Bark used for dyeing fish-nets and cloth.
• Livestock: If cattle no eating fodder because of stomach inflation, leaves are cut into pieces and given as fodder.
• Bast: Yields a bast, which is pinkish cinnamon, but with very little tensile strength.
• Antibacterial: Water extract of leaves of Pterospermum diversifolium showed inhibitory activity against Staphylococcus aureus and Bacillus subtilis. (2)
• Antiulcer / Bark: Study investigated the role of an ethanolic fraction of bark extract on different experimental ulcer models in rats. Results showed significant antiulcer activity against aspirin, indomethacin, and ethanol-induced ulcerations, with significant inhibition of gastric secretary volume, and total acidity in pylorus ligated rats. (4)
• α-Amylase Inhibition / Antidiabetic / Hypolipidemic: Study investigated the in silico, in vitro α-amylase potential and anti-diabetic activity of P. acerifolium bark. An ethanol extract of bark showed marked α--amylase inhibition compared to other fractions. Diabetic rats treated with the extract showed reduced fasting glucose, HbA1c, liver enzymes, triglycerides, and total cholesterol. Results confirmed antihyperglycemic activity with antihyperlipidemic and antioxidant properties. (6)
• Antioxidant / Bark: Study subjected a methanolic extract of Pterospermum acerifolium to various in vitro antioxidant tests. Results showed a significant decrease in DPPH radical, H2O2 and superoxide anion comparable to standards ascoribic acid and BHA. Antioxidant activity was attributed to flavonoid, kaempferol, and luteolin. (7)
• Acute and Subacute Toxicity Studies / Leaves: Study evaluated the toxicity profile of a methanolic extract of P. acerifolium in acute and sub-chronic oral administration in male and female Wistar albino rats. Overall, the extract was non-toxic at low dose, with low toxicity potential in acute and chronic oral administrations. However, at high doses, repeated administration showed significant hepatotoxic and nephrotoxic potential. (8)
• Antinociceptive / Anti-Inflammatory / Leaves: A petroleum ether extract of leaves showed significant and dose-dependent decreased nociception. ß-sitosterol significantly reduced carrageenan-induced paw edema in a dose-dependent manner. (9)
• Antimicrobial / Leaves: Study evaluated a methanolic extract of leaves for antibacterial and antifungal activity. Results showed highest antimicrobial activity against S. aureus-ML152. The antifungal activity against Candida albicans and Candida tropicalis was comparable to the drug fluconazole. (10)
• Chromium Adsorption / Fruit Capsule Activated Carbon Vs Commercial Activated Charcoal: Study compared fruit capsule activated carbon of P. acerifolium and commercial grade activated charcoal for adsorption of chromium from aqueous solution. Results showed the adsorption capacity of indigenously prepared fruit capsule activated carbon (FCAC) was much better. (11)
• Antibacterial / Bark: Bark extracts and fractions showed promising antibacterial activity against test bacterial species. Maximum activity was observed in the butanol extract, and Staphylococcus aureus was the most sensitive strain. Phytochemical screening yielded alkaloids, tannin, phenolic compounds, flavonoids, glycosides, saponins, steroids, and triterpenoids. Results justify its use in treating microbial infections in man and livestock. (12)
• Hepatoprotective / Antioxidant / Leaves: Study of a leaf extract against carbon tetrachloride induced hepatotoxicity showed hepatoprotection as well as dose-dependent free radical scavenging activity. (13)
• Antioxidant / DNA Protective: Study of ethyl acetate fractions of leaves, flowers, and bark showed effective antioxidant and DNA protection activity. (14)
• Wound Healing Potential: Study assessed an ethanolic extract of flowers for wound healing activity and effect on tumor necrosis factor-a in a wound excision model of wound repair in Wistar albino rats. Results showed increase rate of epithelization and increase wound contraction with up-regulation of TNF-α. Early wound healing may be due to elevation TNF-α production. (15)
• Osteogenic / Phytoceramides / Seed Coat: Study of seed coats of P. acerifolium yielded two phytoceramides and two acylated phytosterol glucosides together with five known compounds. Compounds 1 and 2 markedly stimulated osteoblast differentiation. (16)