Determination of volatile oil in Piper puberulum and its proper storage time
AIM To determine β-caryophyllene content in volatile oil isolated from Piper puberulum by GCMS choose its proper storage time.METHODS The analysis of volatile oil was performed on HP-5MS (30 m ×0.25 mm,0.25 μm) column with temperature-programming mode,carrier gas was He,and internal standard substance was methyl salicylate.RESULTS Volatile oil rate was between 0.23% and 1.64%.A year later,its drop rate was 22.68%.After a year and a half,it was 41.63%.There was a good linear relationship for β-caryophyllene during 0.033 9-0.542 4 μg (r =0.999 6),the average recovery rate was 98.5% (RSD =2.0%,n =6),the content of β-caryophyllene was 31.363 8-338.957 2 mg/mL.A year later,its drop rate was 35.03%.After a year and a half,it was 44.53%.CONCLUSION It suggests that the storage time of P.puberulum should be no less than one year.
Piper puberulumvolatile oilβ-caryophylleneGC-MSstorage time