title: [Determination of phospholipids in bear bile by isocratic high performance liquid chromatography].
abstract: A high performance liquid chromatographic method for the determination of phosphatidylcholine (PC), phosphatidylethanolamine (PE) and phosphatidylinositol (PI) in the bear bile was established. The air-dried bile of bear was ground into powder and extracted continuously with V(chloroform):V(methanol) = 1:1 to a final dilution 25-fold the volume of the sample. The extract was washed by addition to it of 0.5 its volume of 0.58% aqueous NaCl. The resulting mixture separated into two phases. The lower phase was the total pure lipid extract and was diluted to the desired volume by addition of V(chloroform):V(methanol) = 1:1 mixture and then injected into the HPLC system. The conditions of HPLC were P-E silica column (150 mm x 4.6 mm i.d., 10 microns); V(acetonitrile):V(methanol) = 76:24 mobile phase with a flow rate of 1.5 mL/min and UV detector at 205 nm. The linear regression equation was Y = 5,917X + 1,709(r = 0.9970) for PI, Y = 7,362.1X-6,608.2(r = 0.9949) for PE and Y = 2,457X-2,460.5(r = 0.9972) for PC. The linear range were 1.0-12.0 micrograms, 2.0-24.0 micrograms and 9.5-114.0 micrograms respectively, The relative standard deviation of peaks were 1.6%, 0.89% and 2.6% respectively. The average recovery of PC was 89.30% (RSD = 2.0%). The method enables a simple, rapid and reproducible quantification of PI, PE and PC.
authors.affiliation: Shanghai University of Traditional Chinese Medicine and Pharmacology, Shanghai 200032, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Lu
authors.forename: Z H
authors.initials: ZH
authors.lastname: Wang
authors.forename: X K
authors.initials: XK
authors.lastname: Hong
authors.forename: J J
authors.initials: JJ
authors.lastname: Sun
authors.forename: S W
authors.initials: SW
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001646:Bile / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D010713:Phosphatidylcholines / Q000032:analysis; D010714:Phosphatidylethanolamines / Q000032:analysis; D010716:Phosphatidylinositols / Q000032:analysis; D010743:Phospholipids / Q000032:analysis*; D015203:Reproducibility of Results; D001503:Ursidae
chemical_list: D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D010716:Phosphatidylinositols; D010743:Phospholipids