Determination of effective time of Schizonepeta tenuifalia pieces by classical constant temperature acceleration experiment / 中国中药杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the validity of Schizonepeta tenuifalia pieces.</p><p><b>METHOD</b>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.</p><p><b>RESULT</b>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.</p><p><b>CONCLUSION</b>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.</p>