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Le methanol est un alcool tres present dans notre environnement. Au niveau industriel, c'est un solvant ; au niveau domestique, il est utilise comme antigel et degraissant. Le methanol n'est que peu toxique par lui-meme mais l'acide formique, produit de son metabolisme, est responsable de la toxicite oculaire et neurologique. Le diagnostic repose sur la presence simultanee d'une acidose avec trou...
The spherical beads were first systhesized by cellulose 4-methylbenzoate with partial hydroxyl groups, which was then crosslinked in the beads with 4, 4'-diphenylmethane dissocyanate. The obtained crosslinked beads were packed into an HPLC column and used as chiral stationary phase (CSP) for chiral separation of some racemates by high performance liquid chromatography (HPLC) using mobile phases contained...
The ozonation of three organ phosphorus pesticides, malathion, diazinon and dimethoate, was conducted in water. The influence of the concentration of ozonated water, ozone action mode, degradation time and ion scavenger was discussed. The three organ phosphorus pesticides could bed gradated completely in 15min by bubbling ozone in water. And additional ion scavengers could increase the degradation...
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...
Through culture experiments we have evaluated the effects of light intensity on the growth of Prorocentrum donghaiense. Results show that there is an exponential correlation between algal growth rate and light intensity. Light intensity have affected to the pigment of Prorocentrum donghaiense. We use high performance liquid chromatography (HPLC) analysis of phytoplankton chlorophyll a concentration...
This study used methanol as extraction solvent and eluent, using XAD-4 macroretcular resin as adsorbent, using gas chromatography - mass spectrometer, respectively assayed the organic components of panax rhizosphere soil, panax root exudates and decomposed panax products, the results showed: rhizosphere soil were effectively identified seven kinds of components, and panax root exudates were identified...
A method using solid-phase extraction for cleanup, followed by high-performance liquid chromatography with ultraviolet detection (HPLC/UV), was developed for the determination of forchlorfenuron residues in Fruit and vegetable. The forchlorfenuron is extracted from the sample (15 g) with ethyl acetate (30 mL), and the extract is loaded onto an ENVI-18 column. The forchlorfenuron is eluted with methanol-water...
In order to evaluate the results of slow-release of metronidazole colon-targeted capsules, this study was undertaken to examine the pharmacokinetics of metronidazole colon-targeted capsules, normal reference tablets and colon delivery capsules in dogs. The level of metronidazole and its metabolites in serum simultaneously were measured by high performed liquid chromatography (HPLC). According to the...
In order to analysis of chlorogenic acid in Do-Zhong(Eucommia ulmoides), ultrasolic extraction was used to prepare the sample. With yield of chlorogenic acid as index. The effect of ethanol concentration, ultrasolic power, extraction time, and the ratio of solid to liquid were studied. The extracts were then analysis by high-performance liquid chromatographic (HPLC) method. The results shown that...
A novel method to determine semi-volatile organic compound(semi-VOC) was established by HPLC coupled with a partly-immersed three-phase hollow fiber liquid phase microextraction (PI-LPME) technique for sample preparation. The influence of extraction parameters including organic solvent, pH of donor and acceptor phase, extraction time, the proportion of hollow fiber in gas and liquid were optimized...
Organic compounds are the important pollution compounds in landfill leachates. For determinating organic compounds in landfill leachates, a pretreatment method for the analysis of organic components is the important step. In this paper, the landfill leachates were extract with liquid-liquid extraction (LLE) and solid-phase microextraction (SPE), respectively. The effect of different extraction methods...
Soybean saponins have a lot of physiological activities and pharmacological action, and can be used to resist cancer, adjust immunity, prevent and treat cardiovascular diseases, and so on. However, the activities of soybean saponins in natural form are not the best. In this thesis, biotransformation of group B soybean saponins was studied to increase physiological activity of soybean saponins. The...
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;...
China has the rich bamboo resource, moreover, the species and yield of bamboo both are the first in the world. The extract of bamboo root was often used to cure some intractable diseases in the countryside of China, but the components of bamboo root extract is still unresolved. In order to expedite medicinal application of bamboo root, and to provide further scientific foundation for its top value-added...
Based on the theory of stochastic resonance, a new method was presented to enhance signal-to-noise ratio (SNR) of HPLC/MS signal for trace analysis with a new optimization method of the system parameters. The method was applied to experimental weak signals of HPLC/MS, which was embedded in the noise background and the SNR was enhanced greatly. The LOD and LOQ were improved from 10 ng/ml and 25 ng/ml...
A novel method extracting with ether, deriving by methanol, deteminating with gas chromatography-mass spectrometry (GC-MS) for analyzing 8 kinds of acid herbicide residues in water has been established. The optimum experimental conditions were as follows: Adding 8 drops of concentrated sulfuric acid; adding 1.0 mL methanol; deriving 60.0 min. Linear of all herbicides is good in the range of 0.05 to...
A trace analytical method of o-chloropheno, chlorobenzene and ethylbenzene in water had been developed by using salting-out phase separation microextraction coupled to high performance liquid chromatography. A Diamonsil C18 column (5μm, 250×4.6mm i.d.) was used for separation at 30°C with detection wavelength at 220nm; The mobile phase was a mixture of methanol and water (the ratio of volume was 53:47),...
A rapid general method for the determination of residual solvents in thiamine was studied. This paper demonstrated static headspace gas chromatography (HS/GC) with either flame ionization detection (FID) or mass spectrometry (MS) for the determination of volatile residual solvents in pharmaceutical products. The analytical method performance characteristics were investigated, including the repeatability,...
Various extracts of Wikstroemia chamaedaphne were evaluated their acaricidal activities against Tetranychus cinnabarinus (Boisduval) and Tetranychus urticae Koch (Acari: Tetranychidae) in laboratory. According to our study, the Wikstroemia chamaedaphne extracts had significant acaricidal activities against T. cinnabarinus and T. urticae. In this study, the mean LC50 value for T. cinnabarinus and T...
Bisphenol A is not only an important chemical raw material, but also an environmental estrogen. This article examines the reactions of bisphenol A in sub-critical water. The experimental factors, such as ratio of solvent to BPA (8.0), temperature (270~330 °C), reaction time (5~60 min) and Sodium Chloride(NaOH) concentration (0~25 g·L-1) were investigated; The decomposition products were analyzed by...
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