Study on the Volatile Components of Gastrodia elata

For the first time,the volatile components of secondary protocorm are extracted by the improved vapor distillation.The compounds are determined by GC-MS,and their relative quantities are calculated by area normalization method.There are 42 volatile components from Gastrodia elata B1.f.elata(14 known),accounting for 63.189% of total content;48 constituents of the essential oils from Gastrodia elata B1.f.viridis Mak(29 known),accounting for 84.313% of total content.The main components of Gastrodia elata B1.f.elata are 2,3,5,6-tetramethyl pyrazine(25.331%),2-pentyl-furan(11.974%) and E,E-2,4-decadienal(8.66%).The main components of Gastrodia elata B1.f.viridis Mak are ethyl linoleate(15.444%),styrene(10.352%) and ethyl palmitate(10.066%).There are 8 common components in the two kinds of Gastrodia elata B1,which may be chemical dactylograms in determination of Gastrodia elata B1.