Huang Bai (Phellodendron amurense)

Huang Bai (Phellodendron amurense) is a medicinal bark primarily valued for its bioactive alkaloid content rather than macronutrient density. Key bioactive compounds include: Berberine (primary alkaloid, 0.6–6.0% dry weight of bark, bioavailability ~5% orally due to P-glycoprotein efflux and poor intestinal absorption, enhanced by piperine co-administration), Palmatine (0.5–2.5% dry weight), Phellodendrine (0.2–1.0% dry weight), Magnoflorine (0.1–0.8% dry weight), Jatrorrhizine (0.1–0.5% dry weight), and Candicine (trace amounts). Limonoids present include Obacunone and Limonin (0.05–0.3% dry weight), contributing to bitter taste and anti-inflammatory activity. Phenolic compounds include Ferulic acid and Caffeic acid derivatives (total phenolics approximately 15–30 mg GAE/g dry extract). Flavonoids including quercetin and kaempferol glycosides are present at approximately 2–8 mg/g dry weight. Phytosterols (beta-sitosterol, stigmasterol) are found at trace to low concentrations (~0.1–0.5 mg/g). Macronutrient content is minimal in typical therapeutic doses (1–10 g bark/day): crude fiber approximately 20–35% of dry bark weight; protein approximately 5–10% dry weight; fat less than 2% dry weight; carbohydrates approximately 40–55% dry weight (primarily structural polysaccharides). Micronutrients include trace amounts of zinc (~12 mg/100g dry bark), manganese (~8 mg/100g), iron (~15 mg/100g), and magnesium (~200 mg/100g dry bark), though these are not clinically significant at standard dosing. Bioavailability note: Berberine undergoes extensive first-pass metabolism with absolute oral bioavailability below 5%; plasma Cmax typically 0.1–0.5 µg/mL after standard dosing; co-formulation with lipid carriers or sodium caprate significantly improves absorption. Water-based decoctions extract primarily alkaloids and some polysaccharides; ethanol extracts yield higher concentrations of alkaloids and lipophilic compounds.