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Biomedical subjects

A B Melent'ev

Publications and source records attributed to A B Melent'ev.

7 recordsLinked to original sources
PubMedDate not supplied

[Testing problems regarding narcotic substances in hair analysis].

The authors discuss legal, ethic, and technological problems associated with introduction of drug testing by analysis of hair in Russia. There are sufficiently reliable methods of hair analysis, but lack of legal basis and poor equipment of forensic chemical departments impede the introduction and wide use of these methods in Russia. The authors propose certification of the best equipped departments and render them the legal status of regional centers for tests for narcotics and psychotropic agents.

Autopsy↗
PubMedDate not supplied

[The determination of clozapine in blood and urine by gas chromatography-mass spectrometry].

A method for measuring closapine in the blood and urine by gas chromatography-mass spectrometry as a trifluoroacetic derivative is proposed. The threshold level for closapine detection is 25 ng/ml in the blood and 30 ng/ml in the urine. Calibration curves are linear in the range 0.025-5 mcg/ml for the blood and 0.03-50 mcg/ml for the urine. The method can be used in forensic chemical and clinical toxicological analysis.

Antipsychotic Agents↗
PubMedDate not supplied

[Determination of clofelin in blood by gas chromatography-mass spectrometry].

Gas chromatography--mass spectrometry is proposed for measuring clofelin (clonidine) in cadaveric blood. The method includes liquid-liquid extraction of clonidine from the blood, derivatization with pentafluorobenzyl bromide, and subsequent purification of derivatization products before chromatographic analysis. The range of 0.5-50.0 ng/ml covers therapeutic and lethal concentrations of clonidine in the blood. The method was tried on expert material in Chelyabinsk Regional Bureau of Forensic Medical Expert Evaluations and can be used in forensic chemical and toxicological analysis.

Antihypertensive Agents↗
PubMedDate not supplied

[Role of alcohol in heroin overdose].

The relationship between ethanol and risk of heroin overdosage was studied. Statistical processing of the results of forensic chemical analysis (460 expert evaluations) carried out in Chelyabinsk Regional Bureau of Forensic Medical Expert Evaluations in 2000 was carried out. The results of morphine and ethanol measurements in the blood and urine from corpses where deaths ensued from narcotic or ethanol poisoning, were analyzed. The concentrations of morphine in the blood and urine were measured on a gaseous chromatographer with mass-selective detector (Hewlett Packard HP 6890/HP-5972). Methods for measuring urinary and blood morphine are described. The results of statistical analysis demonstrated relationships between the age and ethanol concentrations in the blood and urine; blood ethanol and total urinary and blood morphine concentrations; blood concentration of free morphine and presence of 6-monoacetylmorphine in the blood. The authors conclude that the presence of ethanol in the blood together with morphine drastically augments the risk of rapid death from respiration arrest. It can also lead to a relatively high risk of overdosage in experienced narcomaniacs using heroin and ethanol.

Alcohol Drinking↗
PubMedDate not supplied

[Detection of cannabinoids in urine].

Described in the paper are results of comparative examination of urine by the methods of immunochromatographic express analysis (ICA), fluorescence-polarization immune analysis (FIA) and of thin-layer chromatography (TLC) made for the purpose of detecting consumers of hemp products. A high specificity and a good sensitivity of the methods were demonstrated, which is a basis for using them as preliminary tests in detecting cannaboids and their metabolites in urine. The methods were evaluated quantitively and qualitatively versus the etalon method of chromato-mass-spectrometry. A possibility was pointed out to apply the methods of ICA and TLC as system analysis in the determination of 11-nordelta-9-tetrahydrocannabinol-9-carbonic acid in urine of marijuana users.

Cannabinoids↗