Ionization Methods in Organic Mass Spectrometry pot

... good for some inorganics and organometallics (e.g. copper phthalocyanine) . corrosive, use care Ionization Methods in Organic Mass Spectrometry Contents: . Introduction . Gas-Phase Ionization . ... Da. Atmospheric Pressure Ionization (Spray Methods) In these methods, a solution containing the analyte is sprayed at atmospheric pressure into an in- terface to the vacuum o...

Ngày tải lên: 22/03/2014, 14:20

... for transf erring analyte molecules into the gas phase and ionizing them can easily result in intense fragmentation of the molecules, as in certain desorption ionization methods, inductively coupled ... within a B field based on momentum (mv). Some founding innovators in the development of magnetic analyzers (and indeed MS) included Wein, Thomson, Aston, and Demps ter. 10 INTRODUCTION...

Ngày tải lên: 28/03/2014, 10:20

... included in the study. The validity of the applied methods for the diagnosis of tuberculosis tuberculin skin test (TST), sputum smear, and used in diagnostic chest X-ray findings (CXR), clinical ... tuberculin skin test (TST), sputum smear, and used in diagnostic chest X-ray findings (CXR), clinical features and history were evaluated as culture was considered the reference test....

Ngày tải lên: 29/03/2014, 03:20

... proteins.  The potential exists for direct monitoring of proteins on the surface of cells in culture from tissue sections. Desorption Electrospray Ionization Mass Spectrometry Terminology Mass Nominal ... ElectroSpray Ionization  ESI greatly enhanced the ability to characterize protein and peptides by MS.  ESI requires the sample of interest to be in solution- flow in to...

Ngày tải lên: 29/03/2014, 04:20

... studies in organic chemistry. 2,3 Although direct infusion electrospray ioniz- ation spectrometry (ESI-MS) 4–9 and membrane introduction mass spectrometry (MIMS) 10–12 are gaining popularity in this field, ... trace of m/z 273 in Fig. 5. The more interesting thing is that the shape of individual pulses (indicated by the slope of the arrows) kept changing. For example, at the begi...

Ngày tải lên: 14/02/2014, 08:20

... structures of CTX– inhibitor complexes gave interesting insights into the binding. Surprisingly, none of the inhibitors occupied any of the aglycone subsites of the active site. The binding to only ... deter- mine binding constants for protein–inhibitor complexes as explained in Experimental Procedures. The mass spectra were first background subtracted. Assuming that the observed protein i...

Ngày tải lên: 07/03/2014, 17:20

... procedures for determination of organic compounds in finished drinking water, source water, or drinking water in any treatment stage. The method is applicable to a wide range of organic compounds ... hydrocarbons (PAH), including the labeled PAHs used in this method as internal standards, are rapidly oxidized and/or chlorinated in water containing residual chlorine. Therefore, res...

Ngày tải lên: 22/03/2014, 14:20

... (including surface water and sewage water) in many studies worldwide (Kari and Giger, 1995; Knepper et al., 2005). Thus, control of EDTA in drinking water is critical. In Japan’s drinking water ... determination by using gas chromatography -mass spectrometry, we focused on the pretreatment of EDTA by using solid-phase extraction in the present study. In comparison with evapo...

Ngày tải lên: 05/09/2013, 10:15