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n heptane/dichloromethane
Odkaz je uložen do schránky
Strana 1 z 29 Výsledek
Optimization of the HPLC enantioseparation of 3,3'-dibromo-5,5'-disubstituted-4,4'-bipyridines using immobilized polysaccharide-based chiral stationary phases.
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The HPLC enantioseparation of nine atropisomeric 3,3',5,5'-tetrasubstituted-4,4'-bipyridines was performed in normal and polar organic (PO) phase modes using two immobilized polysaccharide-based chiral columns, namely, Chiralpak IA and Chiralpak IC. The separation of all racemic analytes, the effect
[Characterization of surface properties of 1-allyl-3-methylimidazolium chloride ionic liquid by inverse gas chromatography].
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The determination of the dispersive component of surface free energies (gamma(s)d) at different temperatures and Lewis acid-base parameters of 1-allyl-3-methylimidazolium chloride ionic liquid ([AMIM]Cl) were investigated by means of inverse gas chromatography (IGC). Four n-alkanes, including
Optimization of selective pressurized liquid extraction for extraction and in-cell clean-up of PCDD/Fs in soils and sediments.
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This paper describes the development of methods for selective extraction of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) from soils and sediments, using pressurized liquid extraction with in-cell clean-up (SPLE). Two binary solvent mixtures, viz.
Analysis of volatile organic compounds in pleural effusions by headspace solid-phase microextraction coupled with cryotrap gas chromatography and mass spectrometry.
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Headspace solid-phase microextraction coupled with cryotrap gas chromatography and mass spectrometry was applied to the analysis of volatile organic compounds in pleural effusions. The highly volatile organic compounds were separated successfully with high sensitivity by the employment of a cryotrap
[Determination of the four generic fractions of aged bitumen by thin-layer chromatography with flame ionization detection].
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The aging process of bitumen has been paid more and more attention by the researchers. The four generic fractions (saturates, aromatics, resins and asphaltenes) of bitumen change significantly during the aging process. The analysis of the changes of the four generic fractions of bitumen is very
Opiate concentrations in human head, axillary, and pubic hair.
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The concentrations of morphine and codeine were investigated in hair from the head, axillary and pubic regions obtained from 12 fatal heroin cases. Hair preparation involves a decontamination procedure in dichloromethane at 37 degrees C for 15 min, solubilization in sodium hydroxyde at 100 degrees C
Contaminant breakthrough: a theoretical study of charcoal sampling tubes.
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A previously developed theoretical model was applied to investigate contaminant breakthrough on charcoal sampling tubes. Associated with the model are two important theoretical parameters. These parameters are k' (a rate constant) and tau (the time required for 50% contaminant breakthrough). In this
Optimisation of pressurised liquid extraction for the determination of p,p'-DDT and p,p'-DDE in aged contaminated Ethiopian soils.
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The effectiveness of extracting p,p'-DDT and p,p'-DDE from aged contaminated soil samples by means of pressurized liquid extraction (PLE) was evaluated. Two soil samples, which were contaminated more than 10 years ago, were used in the investigation. The static extraction time was optimised and then
Variability of opiates concentrations in human hair according to their anatomical origin: head, axillary and pubic regions.
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The concentrations of morphine and codeine were investigated in hair from the head, axillary and pubic regions obtained from 20 fatal heroin cases. Hair preparation involves decontamination procedure in dichloromethane at 37 degrees C for 15 min, solubilization in sodium hydroxide at 100 degrees C
A new method for high-performance liquid chromatographic determination of drotaverine in plasma.
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A sensitive, specific high-performance liquid chromatographic procedure was developed for the determination of plasma drotaverine levels. Basic plasma samples were adjusted to pH 1.5 and extracted with chloroform. HPLC [n-heptane-dichloromethane-diethylamine (50:25:2)] on a microporous silica
Development of a standardized analysis strategy for basic drugs, using ion-pair extraction and high-performance liquid chromatography - II. Selection of preferred HPLC-systems.
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A test set of 100 basic drugs has been chromatographed on 16 preselected HPLC-systems using four different types of stationary phase (Si-, NH2-, CN- and C18-). A numerical treatment of the chromatographic data, based on the discriminating power concept, results in the selection of two preferred HPLC
A rapid and sensitive spectrophotometric procedure for the micro determination of carbamazepine in blood.
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An ultraviolet spectrophotometric procedure for the micro determination of carbamazepine in blood is described which is based on the original 9-methyl-acridine method proposed by Beyer, K.H. and Klinge, K. (1969) (Arzneim-Forsch. 19, 1759--1760). Carbamazepine is extracted from blood with
Isolation and evaluation of the myorelaxant effect of bergapten on isolated rat jejunum.
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BACKGROUND
Plants of the genus Heracleum L. (Apiaceae) have a long history of being used in traditional medicines for the treatment of alimentary tract disorders, and these biological effects have been ascribed to the presence of furanocoumarins (including bergapten).
OBJECTIVE
This study aimed to
Testing for atropine and scopolamine in hair by LC-MS-MS after Datura inoxia abuse.
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Datura inoxia belongs to the family of Solanaceae. This is a very common plant in New Caledonia that contains two main toxic alkaloids, l-atropine and l-scopolamine. In this study, we report the case of a 20-year-old male admitted to an Emergency Unit after consumption of 6 dried flowers in hot
A rapid gas-liquid chromatographic estimation of nicotine in biological fluids.
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A rapid gas-liquid chromatographic method for the estimation of nicotine in plasma is described. Nicotine is extracted from alkalinized plasma into diethyl ether. This is then concentrated by evaporation and, after an acid back extraction is re-extracted into n-heptane (nitrogen detector) or
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