Cryptolepis sanguinolenta (Nibima)

Cryptolepis sanguinolenta is primarily valued as a medicinal plant rather than a dietary food source, so its profile emphasizes bioactive compounds over macronutrients. Key bioactive compounds include: Indoquinoline alkaloids — cryptolepine (0.2–1.0% dry weight of root bark), neocryptolepine (0.01–0.05%), and isocryptolepine (trace amounts), which are responsible for the plant's potent antimalarial, antibacterial, and anti-inflammatory properties. Cryptolepine exhibits strong DNA intercalating activity and is the principal pharmacologically active constituent. Other alkaloids include quindoline (~0.03–0.1%), cryptoquindoline, and biscryptolepine. The root bark also contains phenolic compounds and flavonoids (estimated total phenolic content of 15–30 mg gallic acid equivalents per gram dry weight), contributing to antioxidant capacity (DPPH radical scavenging IC50 ~25–50 µg/mL). Tannins are present at approximately 2–5% dry weight. Saponins are detected in moderate concentrations. Mineral content (root bark): potassium (0.8–1.5 mg/g), calcium (0.5–1.2 mg/g), magnesium (0.3–0.7 mg/g), iron (0.05–0.15 mg/g), zinc (0.02–0.06 mg/g), and manganese (trace). Fiber: crude fiber content in root material is approximately 10–18% by dry weight. Protein: approximately 3–6% crude protein in dried root bark. Carbohydrates: ~40–55% total carbohydrates including structural polysaccharides. Fat content is minimal at <2%. Vitamins: trace amounts of vitamin C and B-complex vitamins have been reported but are not significant dietary contributors. Bioavailability notes: Cryptolepine has moderate oral bioavailability due to its lipophilic indoquinoline structure, which facilitates gastrointestinal absorption; however, first-pass hepatic metabolism may reduce systemic availability. Traditional aqueous decoction preparation (as used in Nibima herbal tea) extracts approximately 40–60% of total alkaloid content. The alkaloid bioavailability is enhanced when consumed on an empty stomach. Tannin content may reduce the bioavailability of co-consumed iron and other divalent minerals by forming chelation complexes.