RESUMO
Gastrodia elata is a plant belonging to orchidaceae family whose root and leave are degenerated without the ability to carry out photo synthesis,but can grow and develop with Armillaria mellea by symbiosis. Its cycle of growth and development from seeds to seeds is much changable under artificial control. Our previousexperience on the sexual propagation of the plant in Guizhou showed that two to four years are needed for its growth and development. It is now found that the cycle can be shortened to two years in the greenhouse partly through breeding and artificial pollination for mature fruit and plumpy seeds and partly through reasonable designing and sowing half a month in advance. So G. elata can be available on the market one or two years earlier.
RESUMO
AIM: To find the optimum extraction of volatile oil. METHOD: To extract the volatile oil by steam distillation or supercritical fluid extraction (SFE). RESULT: (1) The optimum extraction of volatile oil extracting by steam distillation is: Ligustricum Chuanxiong Hort.:Soak time 12 hrs, thin powder, extract time 3hrs, and to add water with 1∶10; Alpinia Officinarum Hance: Soak time 0 hr, thick powder, extract time 3 hrs, and to add water with 1∶10; Curcuma Wenyujin Y.H. chen C. Ling: Soak time 24hrs, mild powder, extract time 1.5hrs, and to add water with 1∶5; Notopterygium incisum Ting: Soak time 0 hr, thick powder, extract time 3 hrs, and to add water with 1∶10. (2) The best condition of volatile oil extracting by SFE is: Ligustricum Chuanxiong Hort.: 60℃, thin powder, press 25MPa, extract time 1.5hrs; Alpinia Officinarum Hance: 60℃, mild powder, press 25MPa, extract time 0.5hr; Curcuma Wenyujin Y.H. chen C. Ling: 60℃, thin powder, press 20MPa, extract time 1 hr; Notopterygium incisum Ting: 60℃, thin powder, press 25MPa, extract time 1hr. CONCLUSION: Supercritical fluid extraction (SFE) is superior to steam distillation.
