Amentoflavone (20% extract) – Powder, 2.5 grams

Amentoflavone consists of two apigenin flavonoid units joined at a specific linkage position (3',8''-biapigenin), creating a larger, more rigid molecular scaffold than monomeric flavonoids. This dimeric structure is studied for how it influences receptor-binding geometry, membrane permeability, and target selectivity compared to the corresponding monomeric apigenin unit, providing a model system for biflavonoid structure-activity relationship research more broadly.

A standardised extract percentage (20% amentoflavone content by weight) ensures researchers can calculate precise active-compound dosing from a consistent starting material, which is important for reproducibility when the extract is derived from plant source material that can have variable natural amentoflavone concentration. Researchers should account for this 20% standardisation when converting total extract mass to active amentoflavone mass for molar concentration calculations in experimental protocols.

Standard approaches include enzyme inhibition assays measuring amentoflavone's effect on relevant enzymatic activity (using purified enzyme preparations and substrate-conversion readouts), alongside receptor or protein-binding assays such as fluorescence polarization or surface plasmon resonance to directly characterise binding affinity. Comparative assays run alongside the monomeric apigenin unit are often used to determine whether the biflavonoid linkage enhances, reduces, or otherwise alters target engagement relative to the parent monomer.