Siphonochilus aethiopicus (African Ginger)

Siphonochilus aethiopicus (African Ginger) is a medicinal rhizome with limited formal nutritional analysis, but the following bioactive and nutritional constituents have been identified: Primary bioactive compounds include sesquiterpenes (dominant class), particularly siphonochilone and siphonochilol, which are unique to this species and present at approximately 0.3–0.8% of dry rhizome weight. Essential oil content ranges from 0.5–1.2% of dry weight, comprising caryophyllene (~15–25% of oil fraction), alpha-bisabolol (~10–18%), zingiberene (~8–14%), and ar-curcumene (~5–10%), mirroring but distinct from common ginger. Flavonoids including kaempferol and quercetin glycosides are present at approximately 0.1–0.4% dry weight, contributing to antioxidant and anti-inflammatory activity. Phenolic acids (caffeic acid, ferulic acid) are detected at trace to moderate levels (~50–150 mg/100g dry weight). Tannins are present at approximately 1.5–3.0% dry weight. Starch constitutes the bulk of the rhizome at an estimated 40–60% dry weight. Crude fiber is approximately 5–8% dry weight. Protein content is low, estimated at 4–7% dry weight. Minerals identified include potassium (~800–1200 mg/100g dry), calcium (~200–400 mg/100g dry), magnesium (~150–250 mg/100g dry), and iron (~10–20 mg/100g dry). Volatile terpenoids show moderate bioavailability via oral mucosa and GI absorption. Lipid-soluble sesquiterpenes have enhanced absorption when consumed with fatty foods. Data on water-soluble vitamin content remains sparse, though trace B-vitamins are presumed present consistent with rhizome botanicals.