[Analysis of essential oil in herba ephedrae-ramulus cinnamomi by GC-MS and chemometric resolution method]

Gas chromatography/mass spectrometry, chemometric resolution method ( CRM) and overall volume integration method were used to analyze the essential components of herbal pair Herba Ephedrae-Ramulus Cinnamomi (HP HE-RC) and compare it with that of single herbs HE and RC. 72, 68, and 97 essential components in essential oil of HE, RC, and HP HE-RC were determined, accounting for 90. 08% , 91. 62% , and 89. 76% of total contents of essential oil of HE, RC, and HP HE-RC, respectively. The numbers of essential components of HP HE-RC are almost the summation of that of two single herbs, but some relative contents of them are changed. Some new components, such as 1, 6-dimethylhepta-1,3,5-triene, tetracyclo[4. 2. 1.1 (2,5 ). 0 (9,10) ] deca-3,7-diene, globulol, ( E, E) -6, 10,14-trimethyl-5,9,13-pentadecatrien-2 -one, etc. have been found in HP HE-RC because of chemical reactions and physical changes during the course of decocation.