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The aim of this study was to develop an off-line, fast, efficient and reliable analytical methodology, capable to determine, both qualitatively and quantitatively, the content of a common oil base mud filtrate in contaminated formation fluids samples. We demonstrate the performance of a methodology based on Gel-Permeation Chromatographic (GPC) analytical signals, combined with a modified factorization...
The chromatographic determination of trace amounts of aromatic hydrocarbons in model solutions based on distilled water was developed. New methods of dispersive microliquid extraction were used. Extra small volume of extractant (10 mcl) and centrifuge usage allows to prepare samples for chromatographic analysis quickly (5–10 min). The proposed procedure and concentration conditions have a great potential...
A portable low-cost gas chromatographic measurement system with a micro machined gas sensor array as detector unit is presented. The system offers the separation and identification of volatile organic compounds and enables on-line monitoring of processes in food industry. This includes food quality, e.g. in fruit stores, slaughterhouse and for consumer protection. Further applications are the detection...
In order to establish a novel technique of separation and analysis of EGCG from tea polyphenols using high-speed countercurrent chromatography (HSCCC), a set of HSCCC apparatus was applied to isolate and purify EGCG from tea polyphenols using two-phase solvent system composed of n-hexane-ethyl acetate-ethnol-water-acetic acid (1:5:1:5:0.25, v:v) in tail to head elution model, which the upper phase...
Pretreatment and determination for mercury species based on coupled chromatography techniques especially the combination of liquid chromatography with atomic fluorescence spectrometry were reviewed in this paper with 17 references, and the new trends for trace and ultra-trace of mercury species analysis in the future was also carried out.
Acetoin (3-hydroxy-2-butanone) is an important flavor compound, widely existing in dairy products and some fruits. An study has been performed on acetoin production Bacillus subtilis TH-49. The mutant was obtained by treating B. subtilis NT-50-44 with compound mutation and subjecting it to a shake flask fermentation selection procedure. It was proved that the main metabolite produced by mutant strain...
We describe a radiotracer imaging system for measuring the biochemical production rates of organic compounds from animals or plants. It uses a high performance liquid chromatography (HPLC) column to separate the compounds and a parallel-plane radiation detector to measure the disintegrations from each compound over a period of time. Because the measurement time is much longer than conventional techniques,...
Drug metabolism is an important aspect for the study of toxic effect in human being. However, the occurrence of several regulatory issues and high cost involved in experimental study on drug metabolism, restrict the study using human as a model system. Keeping this in view, in the present study, the fungus Aspergillus niser was chosen as a model organism for the study of Clemastine metabolism as it...
The volatile oils were extracted from Typha latifolia by Water-steam distillation. Components of the volatile oils were analyzed and identified by gas chromatograph-mass spectrometry (GC-MS), and the allelopathic effect of the volatile oils were also explored by bioassay of Microcystin aeruginosa. The results showed that the volatile oils had activity to inhibit the growth of M. aeruginosa. This study...
Hexane extracts of Potamogeton maackianus were fractionated using silica gel column chromatography under room pressure by antialgal activity-guidence. Ten fractions were obtained and three of them shown obvious antialgal activities. These three active fractions were further separated using gel chromatography (Sephadex LH-20). Then the active fractions Fr 3-5, 3-7 and 3-8 were obtained and their percentage...
As Camphor Camphora essential oil has excellent antibacterial properties, studying defference extraction way provide a theoretical basis for the discovery and development a raesonable way to extract Camphor Camphora essential oil. Supercritical CO2 extraction rate is higher than the tradition way to extract. The volatile oil of Camphor wood which extracted from all experiment were analyzed by the...
Volatile compounds were extracted with a simultaneous steam distillation and extraction (SDE) from multi-strains douchi fermented in different conditions, and analyzed by continued investigations of gas chromatography-mass spectrometry (GC-MS). A combined total of 150 volatile compounds were identified from 11 samples. Arranged according to the sequence of salinity and strains inoculated, the numbers...
The analytical protocols were developed and tested for simultaneous determining three groups of antibiotics including four fluoroquinolones (FQs), three tetracyclines (TCs) and eleven sulfonamides (SAs), in water and soil samples. Solid phase extraction (SPE) was used to enrich and to clean up the aqueous samples. The potassium phosphate buffer and acetonitrile mixture solutions were used to extract...
A method for extraction and separation of petroleum hydrocarbons (PHs) and polycyclic aromatic hydrocarbons (PAHs) from heavy oil-polluted soil was developed. Effects of several factors such as ultrasonic power, temperature, and elution solvents on the extraction were investigated. The experimental results indicated the optimal experimental conditions were obtained as follow: 300 watt of ultrasonic...
13 kinds of typical Environmental Endocrine Disruptors (EEDs) in human serum were detected by Gas Chromatography-Mass Spectrometry-Selected ion Monitoring (GC-MS-SIM) simultaneously, and thirty copies of female serum samples (aged from 10 to 45) collected in Sichuan province, China were detected based on this method. GC-MS-SIM detection, internal standard method, TMCE+TMCS derivatization were used...
Gas chromatography-mass spectrometry (GC-MS) was used to study the compounds from ether extract of Catharsius molossus L., the traditional Chinese medicine, 'dung beetle'. Over twenty kinds of compounds from the ether extract were detected, and fifteen compounds whose match index was more than 800 were identified. All the identified compounds belonged to fatty acids, and the extract was rich in unsaturated...
This paper present an alternative approach of High performance Liquid Chromatography (HPLC) online data storage method using XML for pharmaceutical research applications. XCS (XML for Chromatogram Storage) is presented, which is a module of AMCS (Automated Measurement for Chromatogram Storage), a management system designed for acquiring measured chromatography results by automated measurement and...
A salting-out phase separation microextraction /liquid chromatography method was used for the simultaneous determination of three phenols in water, including α-naphthol, β-naphthol and bisphenol A. The chromatographic conditions: Diamonsil C18 column (5μm, 150×4.6 mm i.d.) was used; The column temperature was room temperature; The mobile phase was methanol / water (57:43); The flow rate was 1.0 mL/min;...
An efficient and sensitive method for simultaneous determination of 70 pesticide residues in coffees has been established and validated. The multiresidue analysis of the pesticides in coffees involved extraction with ethyl acetate, clean-up using gel permeation chromatography (GPC) and solid-phase extraction (SPE), and subsequent identification and quantification of the selected pesticides by gas...
Our research focused on the Characteristics of HPAM degradation, using 11 hydrolyzed polyacrylamide degrading bacteria strains that were gained from Daqing field. In this study, we demonstrated that the degradation capability of the mixed strains was stronger than each single one. In addition, Infrared spectrum analysis and Gas Chromatography analysis on HPAM degradation products showed that, parts...
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