title: Solid-phase extraction of tanshinones from Salvia Miltiorrhiza Bunge using ionic liquid-modified silica sorbents.
abstract: New ionic liquid-modified silica sorbents were developed by the surface chemical modification of the commercial silica using synthesized ionic liquids. The obtained ionic liquid-modified particles were successfully used as a special sorbent in solid-phase extraction process to isolation of cryptotanshinone, tanshinone I and tanshinone IIA from Salvia Miltiorrhiza Bunge. Different washing and elution solvents such as water, methanol and methanol-acetic acid (90/10, v/v) were evaluated. A comparison of ionic liquid-modified silica cartridges and traditional silica cartridge show that higher recovery was observed using ionic liquid-modified silica sorbents. A quantitative analysis was conducted by high-performance liquid chromatography using a C(18) column (5 microm, 150 mm x 4.6 mm) with methanol-water (78:22, v/v, and containing 0.5% acetic acid) as a mobile phase. Good linearity was obtained from 0.5 x 10(-4) to 0.5mg/mL (r(2)>0.999) with the relative standard deviations less than 4.8%.
authors.affiliation: Center for Advanced Bio Technology, Department of Chemical Engineering, Inha University, Incheon 402-751, Republic of Korea.
authors.forename: Minglei
authors.initials: M
authors.lastname: Tian
authors.forename: Hongyuan
authors.initials: H
authors.lastname: Yan
authors.forename: Kyung Ho
authors.initials: KH
authors.lastname: Row
mesh_terms: D045784:Abietanes; D000327:Adsorption; D010616:Phenanthrenes / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D027561:Salvia miltiorrhiza / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*
chemical_list: D045784:Abietanes; D010616:Phenanthrenes; D010936:Plant Extracts; C021751:tanshinone; D012822:Silicon Dioxide