Study on extraction and clathration process of volatile oil in Tianma-Shouwu tablet

Abstract

Objective To optimize the extraction and β-cyclodextrin clathration process of volatile oil in Tianma-Shouwu tablet. Methods The extraction of volatile oil was optimized through the orthogonal design L9(34) with the volatile oil extraction amount as assessment index. The saturated aqueous solution preparation of clathrate form was used. The volume of β-cyclodextrin and volatile oil, clathration temperature, clathration time was investigated by central composite design-response surface methodology, with the score of volatile oil inclusion ratio and utilization ratio as the index. The results were fitted by second-order polynomial equation, and then the best clathration process was determined. Results The optimization extraction process of volatile oil in Tianma-Shouwu tablet was as follows: to add 8 times water, immerse 30 minutes, steam distill 6 hours; and the best clathration process was as follows: the ratio of β-cyclodextrin and volatile oil was 9.50︰1, clathration temperature 43 ℃, and clathration time 4.2 hours. Conclusions The optimized extraction and clathration process were reasonable, stabled and repeatable. Key words: Volatile oils; Tianma-Shouwu tablet; Orthogonal test; β-cyclodextrin; Central composite design