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Hollow-fiber flow field-flow fractionation of whole blood serum
Zattoni, A.,Rambaldi, D.C.,Roda, B.,Parisi, D.,Roda, A.,Moon, M.H.,Reschiglian, P. Elsevier 2008 Journal of chromatography Vol.1183 No.1
Hollow-fiber flow field-flow fractionation is here applied to untreated, whole human blood serum. Matrix-assisted, laser desorption/ionization time-of-flight-mass spectrometry (MALDI-TOF-MS) of serum fractions shows mass signals in the <30000M<SUB>r</SUB> range where low-abundance, serum protein components are known to be present, though a membrane of nominal 30000Da cutoff was employed for the fractionation device. Using diluted sera spiked with low amounts (0.06-0.1%, w/w) of an artificial mixture constituted the human adrenocorticotropic hormone fragments 18-39 (M<SUB>r</SUB>=2465.7) and 7-38 (M<SUB>r</SUB>=3659.2), and of bovine insulin (M<SUB>r</SUB>=5734), horse cytochrome c (M<SUB>r</SUB>=12384) and chicken lysozyme (M<SUB>r</SUB>=14388), a hybrid fractionation/microfiltration mechanism shows to govern the separation of the low-M<SUB>r</SUB> components.