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Biomedical subjects

B Dehon

Publications and source records attributed to B Dehon.

9 recordsLinked to original sources
PubMed2006

[Assessment of occupational exposure to ortho-toluidine using gas chromatography-mass spectrometry].

Ortho-toluidine is a carcinogen aromatic amine. It is in part eliminated as unchanged form and its urine determination allows biologic monitoriing of occupational exposure. We propose a new method simple and fast in gas chromatography mass spectrometry. In the Nord-Pas-de-Calais region, a company initiated destruction and depollution of an old industrialsite.The GS-MS method permits exposition evaluation of workers employed in demolition of a liquid SO2 plant polluted with ortho-toluidine. This plant has been stopped twenty years ago. These results are compared with results of workers without any exposure in the same company. A 5 mL urine sample spiked with internal standard (ortho-toluidine D9) is extracted with hexane. Derivatisation is achieved with anhydrous pentafluoropropionic acid during 30 min at 60 degrees C. Chromatographic separation is performed on a BPX5MS column (25 m x 0.25 mm, 0.25 microm; SGE). Initial column temperature (60 degrees C) is hold 3 min then is raised to 300 degrees C at 25 degrees C/min. Detection is performed with mass spectrometry with negative chemical ionisation with methane. Acquisition is performed in single ion monitoring. Identification ions are 233 ion (m/z) and 213 ion (m/z) with 233 (m/z) used for quantification. Linearity of the method is verified between 0.1 and 100 microg/L. The limit of detection is 0.02 micro/L. Repeatability and intermediate fidelity are satisfactory (CV < 9%). For unexposed workers, urinary concentrations of ortho-toluidine ranged between 0.17 microg/L and 2.46 microg/g creatinine. Urinary concentrations for exposed workers ranged between 26.14 and 462.00 microg/g creatinine and after new action of protection between 2.35 et 20.11 microg/g creatinine. This new GC-MS method is specific and sensitive and allows for urinary determination of ortho-toluidine. Results showed that this method is adapted for biomonitoring as much for unexposed workers to this aromatic amine as for exposed workers.

Gas Chromatography-Mass Spectrometry↗
PubMed2003

Rapid and simple determination of selenium in blood serum by inductively coupled plasma-mass spectrometry (ICP-MS).

An inductively coupled plasma mass spectrometer (ICP-MS) with a rapid sample-preparative procedure was used for the determination of selenium in blood serum. Blood serum was prepared by dilution in an acidic solution consisting of nitric acid (1%), X-triton (0.1%) and 1-butanol (0.8%). A calibration curve was established for 1-40 microg mL(-1) (r(2)>0.99). The limit of detection was 0.5 microg mL(-1). Repeatability and intermediate precision were satisfactory with relative standard deviations (RSD) of 2.0% and 3.2%, respectively. This method was easily applied to reference materials with satisfactory accuracy. Good correlation (r(2)=0.96) was observed between ICP-MS and atomic absorption spectrometry (AAS) for the determination of (82)Se in blood serum from 23 patients. These results suggest that the sample preparative procedure coupled with ICP-MS can be used for the routine determination of (82)Se in human blood serum.

Blood Chemical Analysis↗
PubMed2003

Major ketogenesis and the absence of an osmolar gap in an atypical case of alcoholic ketoacidosis.

A new case of alcoholic ketoacidosis (AKA) is presented because of unusual clinical and biochemical features. Although it shares some similarities with typical cases of AKA, it appears as unique because of predominantly neurological, rather than abdominal symptoms, major ketogenesis with normal ketone body ratio, the presence of large amounts of propanediol and the absence of an osmolar gap.

Acidosis↗
PubMed1999

Colchicine poisoning: report of a fatal case with body fluid and post-mortem tissue analysis by high-performance liquid chromatography.

A case involving a suicide by the ingestion of colchicine tablets is presented. Liquid chromatography has been used to measure the drug level in blood and in post-mortem tissues of the patient (a 42-year-old man). Plasma concentration 24 h after ingestion was 4.5 ng/mL. On autopsy, the kidney showed the highest concentration (396 ng/g). High concentrations were also found in the liver (347 ng/g) and heart (334 ng/g). Low concentrations were detected in the lung (58 ng/g), muscle (10 ng/g) and brain (5 ng/g).

Adult↗
PubMed1999

[Identification and quantitative determination of chlorinated++ solvents after solid phase microextraction. Applications in hospital toxicology].

A simple method for the research and the identification of chlorinated solvents in biological fluids and tissues is described. The solvents are extracted using headspace solidphase microextraction and detected or measured by gas chromatography with electron capture detector. Three accidental poisonings are reported: one with carbon tetrachloride, one with trichlorethylene and the last one is a double intoxication with tetrachloroethylene and trichlorethylene.

Chromatography, Gas↗
PubMed1987

Evaluation by immunoblotting of the criteria for tubular lesions diagnostic with urinary SDS-PAGE.

Immunoblotting methods have allowed the identification of 14 urinary proteins. From this study, it appears that some low-relative-molecular mass proteins are derived from disrupted high-relative-molecular mass proteins. The only reliable bands for the diagnosis of tubular lesions, on the polyacrylamide gel stained with Coomassie Blue, are retinol-binding-protein and beta 2-microglobulin. alpha 1-microglobulin can overlap with breakdown products of albumin. The visualization of Ig light chains and lysozyme is rather poor after Coomassie Blue stainings and the accurate identification of these bands may be only improved by the use of immunoblotting.

Collodion↗
PubMed1986

Reducing the artifacts produced by impure antisera in immunoblots of low-molecular-mass proteins in urine.

Immunoblots of several urinary low-molecular-mass proteins can be very useful in investigations of pathological proteinuria. However, use of certain commercial antisera in such procedures leads to artifacts corresponding to nonspecific bands; e.g., immunoglobulins from nonimmunized rabbit serum may bind to human urinary proteins, and this binding is not inhibited by Triton X-100. We have developed a procedure to improve the specificity of detection of urinary low-Mr proteins separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, by immunoblotting with commercial antisera: we treat the protein blot with a mixture of mercaptoethanol and sodium dodecyl sulfate before incubation with the first antiserum. This allows direct use of commercial antisera without prior absorption of contaminating antibodies.

Alpha-Globulins↗
PubMedDate not supplied

Tetrachloroethylene and trichloroethylene fatality: case report and simple headspace SPME-capillary gas chromatographic determination in tissues.

We describe a simple, precise, and sensitive assay of tetrachloroethylene and trichloroethylene in tissues, suitable both for emergency cases and forensic medicine. The method employs headspace solid phase microextraction-capillary gas chromatography and electron capture detection. The case is relative to a 45-year-old woman discovered unconscious in a laundry area. The concentrations of the solvents in tissues were determined and compared to other previously published fatalities.

Chromatography, Gas↗