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  • Title: Solid-phase extraction of tanshinones from Salvia Miltiorrhiza Bunge using ionic liquid-modified silica sorbents.
    Author: Tian M, Yan H, Row KH.
    Journal: J Chromatogr B Analyt Technol Biomed Life Sci; 2009 Mar 15; 877(8-9):738-42. PubMed ID: 19237325.
    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%.
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