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Reference standards for residue analysis of chloramphenicol in meat and milk: a critical study
Springer Science and Business Media LLC - Tập 27 - Trang 489-493 - 1989
A collaborative study was organised, according to the ISO 5725 protocol, for the evaluation of methods of residue analysis of chloramphenicol on a national basis and as potential reference methods for the European Community. The methods to be examined were RIA and HPLC. Reference samples were prepared with defined contents of chloramphenicol in the order of 1 μg/kg in milk and 10 μg/kg in meat, re...... hiện toàn bộ
A new column system for isothermal gas chromatographic analysis of light gases (H2, O2, N2, CO, CH4, CO2, C2H4, C2H6 and C2H2) employing a column switch technique
Springer Science and Business Media LLC - Tập 4 - Trang 279-285 - 1971
A new column system for the isothermal analysis of H2, O2, N2, CO, CH4, CO2, C2H4, C2H6 and C2H2 is described. Higher hydrocarbons and water are backflushed from the system. The use of 13X molecular sieve in a relatively deactivated state shortens the elution times of the light components and improves peak shapes. Both factors enable quantitative analyses to be carried out satisfactorily at lower ...... hiện toàn bộ
Determination of chlormequat residues in pears and pear concentrates by benchtop LC-ESI-MS
Springer Science and Business Media LLC - Tập 51 - Trang 531-535 - 2000
A fast, simple and robust method for the routine determination of chlormequat (CCC) in pears and pear concentrates is described. The method is based on sample clean-up using an SPE strong cationic exchange (SCX) cartridge followed by analysis on a benchtop liquid chromatograph coupled to an atmospheric pressure electrospray ionisation mass spectrometer (LC-ESI-MS). The instrument is equipped with ...... hiện toàn bộ
Simultaneous Determination of Fenproporex, Diethylpropione and Methylphenidate in Oral Fluid by LC-MS/MS
Springer Science and Business Media LLC - - 2014
CEC for Studying the Retention and Separation of Pesticides on a Humic Acid Stationary Phase
Springer Science and Business Media LLC - Tập 68 - Trang 791-796 - 2008
A humic acid stationary phase is evaluated for studying by capillary electrochromatography (CEC) the binding of four pesticides with humic acid (HA), the main organic component in soil. It was demonstrated that the humic acid capillary was stable in terms of efficiency and retention during a long period of time. It appeared that HA has a lower affinity for neutral than for charged pesticides. The ...... hiện toàn bộ
Influence of Solvent Additive Composition on Chromatographic Separation and Sodium Adduct Formation of Peptides in HPLC–ESI MS
Springer Science and Business Media LLC - - 2007
Qualitative and quantitative determination of carotenoid stereoisomers in a variety of spinach samples by use of MSPD before HPLC-UV, HPLC-APCI-MS, and HPLC-NMR on-line coupling
Springer Science and Business Media LLC - Tập 57 - Trang S19-S25 - 2003
The carotenoids lutein and zeaxanthin have been identified as the macular pigments of the human retina. Nutritional epidemiological reports indicate that high consumption of fruits and vegetables rich in these carotenoids is correlated with reduced risk of some illnesses, e.g. agerelated macular degeneration (AMD). Because carotenoids are extremely sensitive to UV light and oxygen, they occur in n...... hiện toàn bộ
Simultaneous Determination of Aromatic Amines by Liquid Chromatography Coupled with Carbon Nanotubes/Poly (3-methylthiophene) Modified Dual-Electrode
Springer Science and Business Media LLC - Tập 59 - Trang 167-172 - 2004
Liquid chromatography with amperometric detection (LC-AD) is developed and applied to simultaneously determine five aromatic amines. In the LC-AD, a new carbon nanotubes/poly(3-methylthiophene) modified dual-electrode is fabricated and then used as the working electrode. It is found that this chemically modified electrode (CME) exhibits efficiently electrocatalytic oxidation for aromatic amines wi...... hiện toàn bộ
Eine Methode zur Bestimmung der Totzeit in der Gas-Chromatographie
Springer Science and Business Media LLC - Tập 3 Số 5 - Trang 231-232 - 1970
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