H Kataoka et al.
Journal of chromatography. B, Biomedical sciences and applications, 731(2), 353-359 (1999-10-08)
The technique of automated in-tube solid-phase microextraction (SPME) coupled with liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) was evaluated for the determination of ranitidine. In-tube SPME is an extraction technique for organic compounds in aqueous samples, in which analytes are extracted