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A coupled capillary column system was developed for the qualitative and quantitative determination of melamine with isotope internal standard in dairy products by gas chromatography/mass spectrometry (GC/MS) without derivatization. A 30m of DB-5ms ((5%-phenyl)-methylpolysiloxane, 0.25mm i.d., 0.25μm df) coupled with a 1.5m of Innowax (polyethylene glycol, 0.32mm i.d., 0.25μm df) by a quartz capillary...
A robust and simple approach for microfabricated chip based liquid–liquid extraction was developed for on-chip sample pretreatment. The chip based extraction system was composed of two microfabricated glass plates with a microporous membrane sandwiched in between. A simple bonding approach using epoxy was used to achieve bonding and sealing of the L–L extraction chip. Gravity was employed to drive...
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