piperidines and perfluorodecalin

A gas chromatography-mass spectrometry method (SIM mode) was developed for the determination of perfluorodecalin (cis and trans isomers, 50% each) (FDC), and perfluoromethylcyclohexylpiperidine (3 isomers) (FMCP) in rat blood. The chromatographic separation was performed by injection in the split mode using a CP-select 624 CB capillary column. Analysis was performed by electronic impact ionization. The ions m/z 293 and m/z 181 were selected to quantify FDC and FMCP due to their abundance and to their specificity, respectively. The ion m/z 295 was selected to monitor internal standard. Before extraction, blood samples were stored at -30 degrees C for at least 24 h in order to break the emulsion. The sample preparation procedure involved sample clean-up by liquid-liquid extraction. The bis(F-butyl)ethene was used as the internal standard. For each perfluorochemical compound multiple peaks were observed. The observed retention times were 1.78 and 1.87 min for FDC, and 2.28, 2.34, 2.48 and 2.56 min for FMCP. For each compound, two calibration curves were used; assays showed good linearity in the range 0.0195-0.78 and 0.78-7.8 mg/ml for FDC, and 0.00975-0.39 and 0.39-3.9 mg/ml for FMCP. Recoveries were 90 and 82% for the two compounds, respectively with a coefficient of variation <8%. Precision ranged from 0.07 to 15.6%, and accuracy was between 89.5 and 111.4%. The limits of quantification were 13 and 9 microg/ml for FDC and FMCP, respectively. This method has been used to determine the pharmacokinetic profile of these two perfluorochemical compounds in blood following administration of 1.3 g of FDC and 0.65 g of FMCP per kg body weight, in emulsion form, in rat.

Topics: Animals; Fluorocarbons; Gas Chromatography-Mass Spectrometry; Male; Piperidines; Rats; Rats, Wistar; Reproducibility of Results; Sensitivity and Specificity

Topics: Animals; Blood Substitutes; Cell Membrane; Emulsions; Enzyme Activation; Fluorocarbons; In Vitro Techniques; Luminescent Measurements; Mice; NADH, NADPH Oxidoreductases; NADPH Oxidases; Neutrophil Activation; Neutrophils; Peritoneal Cavity; Piperidines; Protein Kinase C; Signal Transduction; Specific Pathogen-Free Organisms; Superoxides; Tetradecanoylphorbol Acetate

Experiments were conducted in vitro on rabbits to study the effect of emulsions based on composition of carbon perfluorides (decalin perfluoride/methyl cyclohexyl piperidine perfluoride) and proxanol (P-268) on the blood complement system. It is shown that despite preservation of the composition some emulsions activate complement others fail to do this. Intravenous infusion of complement-activating emulsion in a test-dose leads to early neutropenic reaction in the peripheral blood of rabbits and intensified power of low frequency rhythms in the electrocorticogram.

Topics: Animals; Brain; Complement System Proteins; Emulsions; Fluorocarbons; Humans; In Vitro Techniques; Piperidines; Rabbits