A new aqueous two-phase system of ethanol/ammonium sulphate to recovery lithospermic acid B from extract of Salvia miltiorrhiza Bge
GUO Yongxue, WANG Lihong, ZHANG Dayong, ZHOU Lili, XIU Zhilong
CIESC Journal . 2012, (6): 1773 -1779 .  DOI: 10.3969/j.issn.0438-1157.2012.06.017