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We report a quick sample purification method using anion exchange solid phase extraction (SPE), which is highly selective for acidic compounds.
The segmental dynamics of the p-phenylenediamine rings of poly p-phenyleneterephthalamide) (poly p-phenyleneterephthalamideo-dimensional exchange solid state 2H n.m.r.
Briefly, BDCPP and DPP were measured in urine samples using mixed-mode anion exchange solid phase extraction and a mass-labeled internal standard [deuterated (d10 -BDCPP and10 -BDCPP with andlysis by atmospheric pressure chemical ionization liquid chromatography–tandem mass spectrometry.
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A twin fluidized bed solid circulation system, in which two adjacent fluidized beds exchange solids, was developed for coal gasification to produce middle heating value gas.
Two adjacent fluidized beds separated by a wall can exchange solids through an orifice due to the local pressure oscillations on both sides of the orifice produced by passing bubbles.
Resulting peptides were concentrated and purified via mixed-mode cation exchange solid-phase extraction columns (Waters).
Their approach is based on mixed anion exchange solid-phase extraction (MAX-SPE), which may be followed directly by GC/MS analysis by use of various ionization techniques.
The supernatant was supplemented with acetonitrile to a final concentration of 20percentnt (v/v) and passed over a strong anion exchange solid-phase extraction cartridge (ISOLUTE SAX 100 ml/3 ml, Biotage).
The serum and milk samples were extracted using weak anion exchange, solid-phase extraction (Waters Oasis WAX, Milford, MA, USA) based on the method by Taniyasu and colleagues (Taniyasu et al. 2005).
The dried extract was reconstituted in 2 mL of H20 AcOH (99:1) for cleanup by mixed-mode cation exchange solid-phase extraction (Oasis MCX SPE cartridges, 3 cc, 60 mg, Waters, Milford, MA, USA).
Briefly, BDCIPP and DPHP were measured using mixed-mode anion exchange solid-phase extraction and a mass-labeled internal standard (d10-BDCIPP and d10-DPHP) with analysis by atmospheric pressure chemical ionization liquid chromatography-tandem mass spectrometry (Cooper et al. 2011).
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