Huang Qi (Astragalus membranaceus)

Huang Qi (Astragalus membranaceus) is a medicinal root with a complex phytochemical profile rather than a conventional macronutrient-dense food. Key bioactive compounds include: Polysaccharides (astragalans/APS) at approximately 15-40% dry weight, primarily composed of glucose, galactose, and arabinose units, which are the primary immunomodulatory constituents. Saponins (astragalosides I-VIII) at 0.5-2% dry weight, with Astragaloside IV being the most pharmacologically significant at approximately 0.02-0.05% in raw root, known for telomerase activation and cardioprotective effects. Flavonoids (calycosin, formononetin, ononin, calycosin-7-O-glucoside) at approximately 0.1-0.5% dry weight, contributing antioxidant and phytoestrogenic activity. Amino acids including gamma-aminobutyric acid (GABA), proline, and asparagine are present; total nitrogen content reflects approximately 2-4% crude protein equivalent. Trace minerals detected include selenium (0.05-0.2 mg/100g), zinc (2-4 mg/100g), iron (8-15 mg/100g), manganese (1-3 mg/100g), and potassium (approximately 800-1200 mg/100g dry weight). Dietary fiber content is high at approximately 30-50% dry weight (largely indigestible cellulose and hemicellulose from root structure). Beta-sitosterol and other phytosterols present at trace levels (~0.01-0.05%). Bioavailability notes: Astragaloside IV has poor oral bioavailability (~2-5%) due to its large molecular size and hydrophilicity; polysaccharides act largely in the gut and are partially fermented by microbiota; cycloastragenol (aglycone of Astragaloside IV) shows better bioavailability at ~15-20%; extraction method (water decoction vs. ethanolic extract) significantly impacts which compounds are bioavailable, with water decoctions favoring polysaccharides and alcohol extracts favoring saponins and flavonoids.