| abstract |
The process for producing a propolis-ethanol extract is carried out in such a way that the propolis is extracted at a low temperature, such as max. 20 ° C., with an ethanol / water mixture under ultrasound treatment for a short time, such as 25 minutes, in a closed system, and then the the suspension obtained is decanted and the clear propolis extract is freed from the solid particles. The propolis extract obtained is characterized by a high biological activity. |