[Study on ursolic acid extraction rate by ultramicro smashing and conventional smashing from leaves of Paulownia fortunei].
OBJECTIVE
To study on ursolic acid extraction rate from leaves of Paulownia fortunei by conventional powder and ultramicro powder.


METHODS
We spent different time extracting ursolic acid from coventional powder and ultramicro powder, then determined the content by HPLC and compared.


RESULTS
In ultramicro powder the extraction of ursolic acid was nearly twice of conventional powder; The time reaching the maximum extraction of ultramicro powder was 5 minutes, but that of conventional powder was 20 minutes.


CONCLUSIONS
The extraction of ursolic acid from leaves of Paulownia fortunei by ultramicro smashing is more efficient.
Yu
Xiao-Hui
XH
Gansu College of TCM, Lanzhou 730000, China. yxhg123@sina.com
Zhao
Lei
L
Shao
Jing
J
Chen
Lv-Yi
LY
Chen
Yu-Hong
YH
D002851:Chromatography, High Pressure Liquid; D010316:Particle Size; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011208:Powders; D015203:Reproducibility of Results; D028083:Scrophulariaceae / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods*; D013997:Time Factors; D014315:Triterpenes / Q000032:analysis / Q000302:isolation & purification*; D000097245:Ursolic Acid
D011208:Powders; D014315:Triterpenes; D000097245:Ursolic Acid