Chemistry, ClinicalTandem Mass SpectrometryVogeser M, Seger C.doi:10.1016/j.jchromb.2012.01.001Fenton, JohnJ Chromatogr B Analyt Technol Biomed Life SciJournal of Chromatography B Analytical Technologies in the Biomedical & Life SciencesGerhards, P., Bons, U., Sawazki, J., Szigan, J., ...
(μm) Stationary Phase Chemistry Parameters Affecting Resolution Efficiency Retention Selectivity 4 44 4 Performance Changes Doubling column length increases resolution by ~ 40% The smaller the column ID, the greater the efficiency and better the resolution The thicker the film, the greater the ...
10 years after rio-concepts on the contribution of chemistry to a sustainable development. The principles of the United Nations Conference on Environment and Development (UNCED), held in June 1992 in Rio de Janeiro, and Agenda 21, the comprehensi... M Eissen,JO Metzger,E Schmidt,... - 《...
A methodology for the determination of 3,4-methylenedioxymethamphetamine (MDMA), 3,4-methylenedioxyamphetamine (MDA) and methamphetamine (MA) in seized tablets using gas chromatography with a flame ionization detector (GC-FID) is described. The chromatographic conditions, i.e. gas flow rates and te...
The selected transitions and the optimal MS/MS conditions are shown in Table 2. Table 2 Retention time and LC-ESI-MS/MS parameters for analytes Full size table However, the MS responses to sucrose and maltose were very poor even if the derivatization step was employed. The reason may be ...
parameters of the count distributions across bins. we choose to normalize the logarithms of the gene-level counts for at least two reasons. firstly, the logarithm is the canonical link for the poisson (and negative binomial) distribution, hence it seems natural to work on the log-scale when ...
The pharmacokinetic parameters were computed by using WinNonlin program. Results A good linearity was obtained in E from 5 ng/mL to 1000 ng/mL (r2=0.9985) and in PE from 2.5 ng/mL to 500 ng/mL (r2=0.9994). The recoveries were in the range of 107.5 %to 96.2 %and 102.5 %to 93....
Detectability is considered to be one of the most important GC–MS parameters used to characterize the quality and value of an instrument. However, detectability is often misrepresented because all the major vendors use octafluoronaphthalene (OFN) for their spe...
Orthogonal design of 4 factors at 4 levels was applied for the optimization of Headspace system parameters: extraction temperature, stir speed, extraction time, and desorption time, which were set at 40℃, 900r/min, 30min, 5min, respectively. The results showed that extraction temperature and ...
Abscisic acid (ABA) is a phytohormone that plays an important role in the adaptive responses to abiotic stresses. We examined the metabolic changes in transgenic soybean that over-expressed Arabidopsis ABA responsive element-binding factor 3 (ABF3), whic