Rodolfo Max Welendorf

Purification of betulinic acid from Eugenia florida (Myrtaceae) by high-speed counter-current chromatography.

A. Siani, N. Frighetto, M. Nakamura, 2005, Phytochemical analysis : PCA.

Isolation of ursolic acid from apple peels by high speed counter-current chromatography

R. Frighetto, A. Siani, N. Frighetto, 2008 .