[Comparison of properties of Mahuang decoction and Maxing Shigan decoction based on biothermodynamics].

Objective: To probe into the objectivity and authenticity of four properties beteen Mahuang decoction and Maxing Shigan decoction from biothermodynamics.
Method: The power-time curves of growth of Staphylococcus aureus at different concentrations between Mahuang decoction and Maxing Shigan decoction were determined by TAM Air Isothermal Calorimeter. The growth rate constants of promotive and inhibitory actions were calculated. Moreover, the difference of properties beteen Mahuang decoction and Maxing Shigan decoction was analyzed from the point of view of TCM theory.
Result: Both the Mahuang decoction and Maxing Shigan decoction could inhibit the growth and metabolism of Staphylococcus aureus. The k and Pm were decreased with the mass increase of the decoction. However, inhibitory activity of Mahuang decoction with warm property was weaker than that of Maxing Shigan decoction with cool property. Moreover, Mahuang decoction decreased heat output in growth metabolism more weakly than Maxing Shigan decoction. There was a stable difference between them.
Conclusion: Studying on biothermodynamics can show the difference of four properties of Traditional Chinese Medicine. So, it provides a new and useful means for the study of the properties of traditional Chinese medicine.