Abstract: In order to optimize extraction process parameters for terpenoids from Sorbus tianschanica Ruper, the content of terpenoids in Sorbus tianschanica Ruper as the raw material was determined to evaluate the effects of soaking time, methanol/water ratio in extraction liquid, material/extraction liquid ratio, extraction temperature and particle size on extraction rate of terpenoids. Results indicated that the optimal extraction conditions for terpenoids from Sorbus tianschanica Ruper were methanol/water ratio of 20:80, material/liquid ratio of 1.5:10 (g/ml); extraction temperature of 60 ℃ and extraction time of 4 h. Under the optimal extraction conditions, the extraction rates of terpenoids from the leaves and branches of Sorbus tianschanica Ruper were 1.59% and 1.45%, respectively. Therefore, the optimal extraction process is simple and reliable, which is suitable for the extraction of medicinal herbs in bulk.

Key words: Sorbus tianschanica Ruper, terpenoids, extraction process