Extraction of basic metabolites of monomethyloxybenzene isomers from aqueous solutions

The results are presented of extraction of 1-methyl-3,4-dioxybenzene, 1-methyl-2,5-dioxybenzene and 4-oxybenzene acid from aqueous solutions with hydrophobic and hydrophilic organic soluvants. It is shown that the degree of extraction depends on the nature of the extragents and pH of the aqueous phase medium. Extraction multiplicity for obtaining necessary quantities of the compounds is calculated.     

Extraction of 2-nitroaniline and 2-nitro-4-methylaniline from aqueous solutions

Results of extraction of 2-nitroaniline and 2-nitro-4-methylaniline from aqueous solutions with organic solvents are shown to depend on the nature of extractants, pH of the aqueous phase, its saturation with water and electrolytes. The optimal conditions for the extraction of the compounds of interest are created by using water-saturated ethylacetate as the extractant at a pH value in the range from 1.0 to 12.0. The rate of extraction was calculated necessary to remove the desired amounts of 2-nitroaniline and 2-nitro-4-methylaniline from aqueous solutions using the above solvents.     

Extraction of 2-amino-4-nitrophenol and 4-phenylphenol from aqueous solutions

The authors provide the results of extraction of 2-amino-4-nitrophenol and 4-phenilphenol from aqueous solutions by five organic soluvants. The dependence of the extraction degree on some factors (nature of extragent, pH of aqueous phase medium, extragents saturation with water) was established. Necessary extraction rate for isolation of preset quality of the test substances was calculated.     

DNOC extractability from aqueous solutions

Extractability of 2-methyl-4,6-dinitrophenol from aqueous solutions by means of different organic solvents was studied. Effect of solvent nature, pH medium and extractant saturation with water was noted.     

Isolation of lambda-cyhalothrin from biological material

Dioxan is proposed as an isolating agent for isolating lambda-cytalotrin (LC) from biological material. Optimal conditions for isolating LC from cadaveric hepatic tissue with dioxan were determined and the results of the isolation were quantified.     

Extraction of trifluralin from acetonitrile solutions

Results of extraction of trifluralin from an aqueous acetonitrile solution using various organic solvents are presented. The degree of extraction was shown to depend on the nature of extractant and the water/acetonitrile ratio. An optimal electrolyte and the degree of saturation of the water-acetonitrile layer with this electrolyte were selected. The highest efficiency of extraction was achieved by using water-saturated ethylacetate as an extractant. The indices of extraction were calculated as necessary for the isolation of a given amount of trifluralin from aqueous acetonitrile (4:1) solutions with the solvents considered in the present study.     

Features of extracting phenol and 4-methylphenol from aqueous solutions

Phenol and 4-methylphenol were extracted from aqueous solutions by 5 organic solvents. The degree of extraction depended on such factors as type of extracting agent, pH of aqueous phase, and water saturation of extracting agent. The necessary number of extractions for obtaining the preset volumes of studied compounds is calculated.     

The extraction of deoxypeganin from aqueous solutions with organic solvents]

Studies of deoxypeganin extraction with various organic solvents have shown that up to 88% of the agent can be easily extracted by chloroform if the medium pH values are 11-12. The presence of electrolytes in deoxypeganin aqueous solutions does not influence the degree of the agent extraction with organic solvents.     

Extraction of 2-methyl-hydroxybenzene and 3-methyl-hydroxybenzene from water solutions

The results related with extracting 2- and 3-methyloxibenzole from water solutions by 5 hydrophobic and 2 hydrophilic organic solvents are described in the paper. A variety of factors are shown to exert influence on an extraction degree: extraction agent (EA) nature, water-phase medium pH, EA saturation with water and adding of electrolytes to the water phase. A repetition factor needed to extract the preset quantities of studied compounds is estimated.     

Extraction of 1,2- and 1,4-dihydroxybenzene from water solutions

The results of extraction of 1,2- and 1,4-dihydroxybenzene from water solutions by the hydrophobic and hydrophilic organic solvents are described. The influence of an extragent nature and of a water-phase pH medium on an extraction degree is demonstrated. The repetition factor needed to extract a preset quantity of examined compounds is calculated.     

Extraction of nitrobenzene and its metabolite 3-aminohydroxybenzene from water solutions

The article presents the results of nitrobenzene and 3-aminohydroxibensene extraction from aqueous solutions by means of five organic solvents. The following factors influence on the extraction degree is shown: the nature of the extracting agent, aqueous phase pH, saturation of some extracting agents with water. The number of extractions for isolation of the necessary quantities of the compounds studied is calculated.     

The extraction and infrared identification of gamma-hydroxybutyric acid (GHB) from aqueous solutions

The chemical analysis of gamma-hydroxybutyric acid (GHB) in most forensic laboratories is complicated by the highly polar nature of the GHB molecule, which makes it unsuitable for direct analysis by gas chromatography (GC). Consequently, a popular analytical approach is to convert GHB into the corresponding lactone or a derivative compound that is then identified by mass spectrometry employed in conjunction with GC (GC/MS). An alternative approach is presented here where GHB may be isolated as a free acid specie from complex aqueous solutions employing a liquid-liquid extraction technique. This approach can yield a relatively pure residue of GHB that presents an infrared transmission spectrum that is sufficiently distinct for identification purposes. Infrared spectroscopy (IR) is a very popular technique that is available to most crime laboratories. The liquid-liquid extraction behavior of GHB is examined in detail and the uniqueness of the infrared spectrum is discussed.     

Optimal conditions for extraction of "caffetin" and "saridon" tablet components from aqueous solutions

Using a mathematical method of experiment planning (Latin square), the authors suggest the optimal conditions for extraction of propifenasone and paracetamol, the basic components of caffeine and saridon tablets, from water solutions: extraction with ethylacetate (pH 2) for 5 min in the presence of an electrolyte (sodium chloride or ammonium sulfate) quantum satis. The possibility of extraction of caffeine and codeine under these conditions was tested. When extracting the components of caffeine and saridon tablets, paracetamol, propifenasone, and caffeine should be extracted with ethylacetate at pH 2 and codeine by chloroform at pH 10.     

利用AutoMate Express~(TM)自动化法医DNA提取系统提取骨骼及牙齿DNA

目的探讨建立骨骼及牙齿DNA自动化提取的新方法。方法将33份骨骼及15份牙齿样本分别用冷冻研磨和手工处理两种方法研磨成粉,采用AutoMate ExpressTM自动化法医DNA提取系统提取DNA并定量。结果 AutoMate ExpressTM自动化法医DNA提取系统能够在3h左右完成骨骼、牙齿DNA的提取,两种方法处理的骨骼样本所得DNA质量浓度差异无统计学意义。冷冻研磨处理的骨骼和牙齿样本均获得了较好的STR分型结果,且牙齿样本所得DNA质量浓度高于手工提取所得。结论应用AutoMate ExpressTM自动化法医DNA提取系统是自动化提取骨骼、牙齿DNA的一种新方法,可应用于法医实际案件检验。