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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"Chromatographic analysis"”.
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Anion exchange chromatographic analysis with conductometric detection
Thesis (M.S.)--Michigan State University. Dept. of Chemistry, 1971
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Gas-liquid chromatographic analysis of arsenic and antimony in water
Includes bibliographical references.
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The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese
… than long chain FFA. Conventional methods of FFA analysis suffer from limitations such as loss of volatile fatty acids during derivatization of samples and difficulties in extraction and separation of short, medium and long chain fatty acids in a single analysis. Enhanced FFA recoveries from …
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Gas chromatographic analysis of amines and other compounds produced by several species of Clostridium
Procedures are described for the routine analysis of amines and other compounds produced in bacterial cultures. Whole cultures were grown in six mls of chopped meat-glucose medium, acidified, and extracted with ethyl ether or chloroform to obtain organic acids, alcohols, ketones, aldehydes, and …
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Utilization of a scientifically operated charge-coupled device detector for high-performance thin-layer chromatographic analysis
A high-performance thin-layer chromatographic (HPTLC) separation system coupled with a scientifically operated charge-couple device detector (CCD) has been developed to improve the identification and quantitative analysis of pharmaceutical products and natural toxins. The combination of the fast, …
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An assessment of a liquid-liquid extraction procedure for the gas chromatographic analysis of chloroform in algal media
… effects of several factors which might alter the analysis of chloroform in aqueous samples by the liquid-liquid extraction (LLE) method developed by Glaze at North Texas State University. A Bendix gas chromatograph (GC) was used. The factors examined were the effect of the ionic strength of the …
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Studies on the fatty acid composition of human serum with special reference to the influence of hormones and other agents
… elaborated for preparing samples for gas-liquid chromatographic analysis of serum lipid fatty acids.
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Effluent analysis of model pyrrone compounds by gas chromatography
A gas chromatographic study was made to quantitatively analyze the effluents produced during the thermal cyclization of several polyimidazopyrrolone (pyrrone) model compounds. The study yielded information on analogous polymeric reactions. The model compounds were programed at 5° C/min from 25° to …
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The removal of carcinogenic polycyclic aromatic hydrocarbons by activated sludge
… was a modified Soxhlet technique followed by gas chromatographic analysis. The amount of Benzo-a-pyrene detected in the effluent, supernatant, sludge filtrate and sludge cake was tabulated to determine the mechanism of removal. The experimental results indicated that adsorption appeared to be.the …
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The amino acid composition of chinchilla fur in relation to the fur-chewing syndrome
… time consuming end less reproducible than the chromatographic analysis. With the exception of proline, glycine, and leucine, higher values were obtained fer the mine acids using the microbiological methods than with the column fractions. The greatest difficulty was encountered in analyzing the …
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Pure culture and metagenomic approaches to investigate cellulose and xylan degradation
… of sugars from xylan was observed through gas chromatographic analysis between the parental and fusant cultures. Genome shuffling was observed in 16S rRNA genes after protoplast fusion. Finally, one putative endo-β-1,4-glucanase was discovered in a metagenomic library created from …
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STUDIES ON THE ANALYSIS AND THE FATE OF ORGANIC POLLUTANTS IN THE ENVIRONMENT
This thesis deals with the analysis and the fate of pesticides in the environment. In the first part of the thesis, new techniques such as solid-phase extraction, solid-phase microextraction, and electrochemical detection, were studied and applied to the analysis of pesticides and their degradation …
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Electrically Controlled Formation and Release of Admicelles for Solid Phase Extraction
… the purpose of analyte preconcentration prior to chromatographic analysis are presented. The surfactant layer serves as the “stationary phase” in a solid phase extraction sorbent scenario. Analytes are adsorbed on this layer, and then released from the solid phase via surfactant removal. The …
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Derivation and chromatographic separation of acid indole auxins
… compounds has been used to facilitate their gas chromatographic analysis. The three phytochemically significant indole acids; 3-indole acetic acid, 3-indole propionic acid, and 3-indole butyric acid along with an analog, D-tryptophan, are four compounds which have been analyzed by this method. A …
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Effect of processing and storage conditions upon canned apple sauce headspace gas composition
… Procedures were developed for sampling for chromatographic analysis gas from cans with high vacuum and small headspace, and for calculating gas volumes. A minimum headspaoe hydrogen was observed in samples within the pH range 3.45-3.75, in products of consistency within the range common to …
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Characterization of structure and enzymic activity of endo-l, 4-β-D-glucanases purified from Trichoderma viride
… lose activity above pH 7.0. High pressure liquid chromatographic analysis permitted determination of enzymic rates of reaction with purified cellooligosaccharides. Endoglucanases II, III and IV display higher activities as the chain-length of cello oligosaccharide substrates progresses from two to …
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Organinių alavo junginių mikroekstrakcija ir dujų chromatografinis nustatymas /
… and apply the most appropriate technique for the analysis of aqueous samples. In real samples OTC exist in cationic form, are non-volatile and polar, so before gas chromatographic analysis OTC must be derivatized. Sodium tetraethylborate has been used for the derivatization. Derivatization …
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Microextraction and gas chromatographic determination of organotin compounds /
… and apply the most appropriate technique for the analysis of aqueous samples. In real samples OTC exist in cationic form, are non-volatile and polar, so before gas chromatographic analysis OTC must be derivatized. Sodium tetraethylborate has been used for the derivatization. Derivatization …
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Use of antioxidant activity and flavonoid levels to assess the quality of commercially available solid dose Sutherlandia frutescens products
… conditions and total phenol, antioxidant and chromatographic analysis was conducted on these samples. Samples of each of the SCP were hydrolyzed using HCL and then analyzed using HPLC to test the stability of the flavonoids present in each product. The SCP investigated in this study physically …
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STEREOCHEMICAL STUDIES OF 1,2-DIAMINOCYCLOHEXANE AND SOME OF ITS DERIVATIVES
… was found to be most convenient for routine analysis. Gas chromatographic analysis after the Eschweiler-Clarke N-methylation was found to give a faulty isomer ratio unless special precautions were taken to insure complete reaction, since the cis isomer was found to undergo unusually slow …
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