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[Determination of effective time of Schizonepeta tenuifalia pieces by classical constant temperature acceleration
Chang-Qin Li1, Jin-Mei Wang, Wen-Yi Kang
1Institute of Chinese Materia Medica, Henan University, Kaifeng 475004, China.
Objective:
To study the validity of Schizonepeta tenuifalia pieces.
Method:
The change principle for the contents of essential oil and pulegone was determined by the way of classical constant temperature acceleration experiment, and the reacting speed at 20 degrees C was calculated according to Arrhenius index law and effective time was calculated.
Result:
In classical constant temperature experiment, the content change of essential oil with the regular pattern of one level. The effective time of S. tenuifalia pieces stored in 20 degrees C was 2.08 years and the constant of speed is 8.453 4 x 10(-6) carried out by essentialoil, 190 days with the constant of speed is 3.39 x 10(-5) carried out by pulegone.
Conclusion:
The effective time of S. tenuifalia pieces was about 2 years carried out by essential oil and 190 days carried out by pulegone by the way of classical constant temperature experiment.
