DEFINITION

Gastrodia Rhizome Powder consists of the dried tuberous rhizome of Gastrodia elata Blume (Fam. Orchidaceae), reduced to a powder. It contains NLT 0.20% and NMT 1.5% of phenols calculated as the sum of gastrodin (C₁₃H₁₈O₇) and 4-hydroxybenzyl alcohol (C₇H₈O₂), and NLT 1.2% of benzyl citrate glycosides calculated as the sum of parishin A (C₄₅H₅₆O₂₅), parishin B (C₃₂H₄₀O₁₉), parishin C (C₃₂H₄₀O₁₉), and parishin E (C₁₉H₂₄O₁₃), all on the dried basis.