Готові списки джерел за темами / Automatic column chromatography

Добірка наукової літератури з теми "Automatic column chromatography"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Automatic column chromatography"

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Chou, Tsong-Yung, Chien-Kuo Wang, A. C. Lua, and Hsueh-Hui Yang. "A simple and high throughput parallel dual immunoaffinity liquid chromatography-mass spectrometry system for urine drug testing." Analytical Methods 10, no. 8 (2018): 832–35. http://dx.doi.org/10.1039/c7ay02755a.

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Анотація:
A simple and rapid method for direct quantitation of drugs in human urine samples was developed using a system composed of an automatic column switch and two home-made capillary immunoaffinity columns (CIACs, 100 μm × 15 cm).
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2

Evans, R. Douglas, Andrei Izmer, Karima Benkhedda, Andrew Toms, Angelo Fernando, and Wei Wang. "Continuous online determination of 226Ra in liquid effluents using automated column chromatography-ICP-MS." Canadian Journal of Chemistry 93, no. 11 (November 2015): 1226–31. http://dx.doi.org/10.1139/cjc-2015-0247.

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A measurement system capable of continuous on-line matrix removal, pre-concentration and analysis of 226Ra using pre-packed columns coupled to a flow injection system and an ICP-MS was developed. Full instrumental control of both the ICP-MS and the flow injection system provided automatic integration of the transient signals. The flow injection system was programmed to control column conditioning, sample loading, column rinsing, analyte elution and column cleaning operations employing appropriate solutions. The application of this system to the 226Ra analysis of an industrial liquid effluent was demonstrated. Using this particular instrument together with pre-concentration and matrix removal procedures, a limit of detection of 5.4 fg L−1 (2 mBq L−1) and a method detection limit of 16.2 fg L−1 (6 mBq L−1) were achieved for the measurement of 226Ra using a 25 mL sample volume. Total time for sample handling and analysis is approximately 10 minutes. The concentration of 226Ra in a discharged effluent sample was 0.73 pg L−1 (27 mBq L−1), which is in good agreement with the value of 0.81 pg L−1 (30 mBq L−1) measured using conventional alpha counting techniques.
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3

Chase, G. William, and Brian Thompson. "Accelerated Solvent Extraction of Vitamin K1 in Medical Foods in Conjunction with Matrix Solid-Phase Dispersion." Journal of AOAC INTERNATIONAL 83, no. 2 (March 1, 2000): 407–10. http://dx.doi.org/10.1093/jaoac/83.2.407.

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Abstract An extraction technique is described for vitamin K1 in medical foods, using accelerated solvent extraction (ASE) in conjunction with matrix solid-phase dispersion (MSPD). The medical food sample is treated as it would be with MSPD extraction, followed by ASE for a hands-free automated extraction. The vitamin K1 in the ASE extract is then quantitated by reversed-phase liquid chromatography with fluorescence detection. The chromatography specifications are identical to those in previous work that used MSPD only, with a limit of detection of 6.6 pg and a limit of quantitation of 22 pg on column. Recoveries, which were determined for an analyte-fortified zero control reference material for medical foods, averaged 97.6% (n = 25) for vitamin K1. The method provides a rapid, automatic, specific, and easily controlled assay for vitamin K1 in fortified medical foods with minimal solvent usage.
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4

Vargas-Bustamante, Jaquebet, Pedro Martínez-Ortiz, Daniel Alvarado-Alvarado, Ulises Torres-Herrera, and Jorge Balmaseda. "Experimental Setup and Graphical User Interface for Zero-Length Column Chromatography." Applied Sciences 12, no. 13 (July 1, 2022): 6694. http://dx.doi.org/10.3390/app12136694.

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Анотація:
This work describes the design and implementation of a Zero-Length Column system to measure: diffusion coefficients, adsorption isotherm parameters of pure components and mixtures. In addition, a graphical user interface (GUI) was developed in LabVIEW for the semi-automatic operation of the system. The system is novel because it integrates all the aforementioned functionalities without using mass spectrometry. Two adsorbents, zeolite 5A and Basolite® C300 (Copper benzene-1,3,5-tricarboxylate) and two adsorbates methane and ethane were used to perform the validation of adsorption and diffusion experiments. The Henry constants and diffusion coefficients obtained reproduce those previously reported. The combination of the experimental setup and the GUI significantly reduce the amount of sample and measurement time needed in the characterization of the molecular sieves by conventional volumetric and gravimetric systems. The proposed system is relatively inexpensive, robust, easy to build, and capable of reproducing the results of other techniques.
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Fischer, W. G., and P. Kusch. "Automatic sampler for curie-point pyrolysis-gas chromatography with on-column introduction of pyrolysates." Journal of Chromatography A 518 (January 1990): 9–19. http://dx.doi.org/10.1016/s0021-9673(01)93158-9.

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6

Einarsson, Östen, and Lars Hansén. "A PC-controlled module system for automatic sample preparation and analysis." Journal of Automatic Chemistry 17, no. 1 (1995): 21–24. http://dx.doi.org/10.1155/s1463924695000034.

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Анотація:
A simple automatic analytical system, consisting of separate modules, for liquid chromatography has been constructed. The different parts of the automatic machine are an auto sampler, an auto dispenser, a selector valve with eight channels, a heater/cooler, a mixing chamber and a pressure air driven injector valve. The process was controlled by a PC from an easily changeable run protocol. The system was applied to analysis of primary amines. The analysis was performed as a pre-column derivatization reaction of the amines and separation by isocratic reversed-phase HPLC with fluorescent detection. Reproducibility and analytical precision have been studied. Comparison between automatically and manually made derivatization reaction and injection was also made. The automatic system was easy to handle, cost-effective and gave good reproducibility.
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7

Moats, William A., and Laura Leskinen. "Determination of Novobiocin Residues in Milk, Blood, and Tissues by Liquid Chromatography." Journal of AOAC INTERNATIONAL 71, no. 4 (July 1, 1988): 776–78. http://dx.doi.org/10.1093/jaoac/71.4.776.

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Abstract Residues of novobiocin in milk, blood, and tissues can be detected by microbiological tests but cannot be distinguished from other antibiotics. A simple liquid chromatographic (LC) method was developed for identification of residues. Tissues were blended and milk and blood serum were mixed with 0.2M NH4H2P04. The mixture was deproteinized by adding aqueous methanol and filtering. The LC apparatus consisted of a variable wavelength detector, set at 340 nm, an automatic loop injector, and a C,8 column with guard cartridge. The flow rate was 1 mL/min and the solvent mixture of 0.01M H3P04-acetonitrile-methanol was programmed from 50 + 0 + 50 (0-1 min) to 20 + 80 + 0 (20 min). Novobiocin was concentrated directly by solid-phase extraction on the analytical column. Five or more 200 11L aliquots of the filtrate in water-methanol (1 + 1) (adjusted if necessary) were injected with the column solvent at 50 + 0 + 50. After the final injection, the program was run to completion. Recoveries were 90-100% with sensitivities of 0.05 ppm or less. The procedure should be adaptable for use with formulations and feeds
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8

Zhou, Fei-Yang, Dong He, Xin Miao, Chun Yang, Jun-Hang Dong, Hong-Tao Zheng, Zhuo Cheng, Xing Liu, and Zhen-Li Zhu. "Development of an Automatic Column Chromatography Separation Device for Metal Isotope Analysis Based on Droplet Counting." Analytical Chemistry 93, no. 19 (May 10, 2021): 7196–203. http://dx.doi.org/10.1021/acs.analchem.1c00145.

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9

Zhang, Li Ming, Yan Qiao Wang, Li Chao Zhang, Shu Li Man та Bei Mei Zuo. "Purification and Characterization of a Yam Glycoprotein Isolated by Alkaline Extraction from Yam Tuber". Advanced Materials Research 560-561 (серпень 2012): 368–73. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.368.

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Анотація:
Yam glycoprotein (YGP) is an important source of bioactives for functional foods. To investigate the effects of alkaline extracting method on the features of YGP, A glycoprotein was isolated from yam tubers by using alkaline processing method, and purified by ion-exchange and gel filtration column chromatography. During the SDS-PAGE eletrophoresis, the result shows a band with approximately 30 kDa molecular weight. The YGP consists of protein moiety (62.34%) and carbohydrate moiety (37.51%), respectively. By the automatic amino acid analyzer detecting, it indicated that the YGP consists of 17 kinds of amino acids and contains a high percentage of glutamic acid and aspartic acid. The results of thin-layer chromatography show that oligosaccharides of the YGP contain D-glucose, D-galactose and mannose.
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10

Suzuki, Yukio. "Determination of low-molecular-mass organic acids in fogwater by ion-exchange chromatography with automatic column switching." Journal of Chromatography A 773, no. 1-2 (June 1997): 123–30. http://dx.doi.org/10.1016/s0021-9673(97)00113-1.

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Дисертації з теми "Automatic column chromatography"

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Lowczak, C. R. "Copper isotope method development for determining the source of mineralised provinces." Thesis, 2019. https://hdl.handle.net/2440/136974.

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This item is only available electronically.
Many isotope proxies have been applied to study the prosperous iron oxide copper gold (IOCG) province in the eastern Gawler Craton (E.G.C) and Au mineralised region of the cental Gawler Craton (C.G.C), in Southern Australia. Yet, copper isotope proxies- an indicator for low temperature fluid flow and sulfide mineralisation- have yet to be applied to the region. In this study, purification techniques using automatic column chromatography were demonstrated during separation of Cu from matrix elements. Cu isotopes – 65Cu & 63Cu – were used to understand the extent of mantle input and mantle metasomatism, potentially responsible for the Cu in IOCG mineralisation. Eleven samples were gathered. Three mafic enclaves and four intrusives from the Central Gawler Gold Province and four intrusives from the eastern Gawler IOCG province. Separation using automatic column chromatography proved challenging, with matrix elements abundant throughout the purified fractions (Co, Ti, Fe, Mg, Na), due to poor separation. Ti proved to a major interference during isotopic analysis using a Multicollector-ICP-MS, positively offsetting values. E.C.G samples showed the most positively fractionated δ65Cu values (+0.69 ± 0.024‰ to +1.422 ± 0.077‰). Enclaves from the C.G.C showed the most negatively fractionated δ65Cu values (-0.053 ± 0.023‰ to -0.897 ± 0.006‰), while intrusives from this region showed more positive δ65Cu values (+0.084±0.23‰ to +0.397±0.011‰). All samples showed a lack of hydrothermal alteration. Magmatic sulphide-containing E.G.C samples had the most positive δ65Cu values; which cannot be explained by current understanding of Cu isotope fractionation during sulfide saturation. This trend may instead be attributed to a heterogeneous sub-continental lithospheric mantle (SCLM) source. In contrast the negative δ65Cu values of mafic enclaves is possibly caused by assimilation of S-type granitic crust and/or possibly due to a heterogeneous SCLM source.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2019
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Частини книг з теми "Automatic column chromatography"

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Kidouchi, Kiyoshi, Chie Nakamura, Toshiyuki Katoh, Tetsuya Kibe, Satoru Ohba, and Yoshiro Wada. "Automated Quantitative Analysis for Orotidine and Uridine/Thymine in Urine by High-Performance Liquid Chromatography with Column Switching." In Advances in Experimental Medicine and Biology, 31–34. New York, NY: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-7703-4_7.

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2

Cooper, J. D. H., D. C. Turnell, B. Green, D. Demarais, and P. Rasquin. "The Analysis of Primary and Secondary Free Amino Acids in Biological Fluids: A Completely Automated Process Using On-Line Membrane Sample Preparation, Pre-Column Derivatisation with O-Phthalaldehyde, 9-Fluorenyl Methyl Chloroformate and High Performance Liquid Chromatographic Separations." In Sample Preparation for Biomedical and Environmental Analysis, 87–115. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1328-9_9.

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3

Hao, Zhigang, Vivian Liu, Jake Salerno, Yu Wang, Mania Bankova, and Long Pan. "Liquid Extraction for Flavor and Fragrance Analyses in Consumer Products." In Recent Advances in Gas Chromatography [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107107.

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Анотація:
Gas chromatography-mass spectrometry is a powerful tool to analyze flavor and fragrance from raw materials to the final commercial products. During the development of new technologies, most focuses have been given to novel columns, advanced detectors, and automation designs to leverage the instrument capabilities. The fundamental factors including polarity impact on sample homogenization and chemical interaction between analytes and extraction solvents are not equally emphasized during the sampling procedures. The current project focused on the liquid extraction procedures prior to GCMS analysis. Significant nucleophilic reactions were found to take place when a water-ethanol solvent was tried to extract flavor and fragrance ingredients. The isooctane in water-isooctane extraction system is friendly with GC columns and effective to extract the volatiles. However, the surfactants, humectants, and polymers in consumer cleaning products have significant impact on analyte distribution between water and isooctane solvents. The enhanced solubility of certain ingredients in water phase will change their profiling information in isooctane. During such extractions, hydrophilic volatile ingredients can be missed and the results become unreliable. For this reason, a newly designed water-n-propanol-isooctane extraction system was compared. This one-phase sample solution follows the homogenization rule in analytical chemistry and be more representative to the original samples.
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4

van de Merbel, N. C., H. Lingeman, U. A. Th Brinkman, A. Kolhorn, and L. C. de Rijke. "Automated monitoring of biotechnological processes using on-line ultrafiltration and column liquid chromatography." In Analytical Biotechnology, 39–50. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-444-81640-5.50007-0.

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Huber, R., and K. Zech. "Chapter 2 Determination of Drugs and Their Metabolites in Biological Samples by Fully Automated Hplc with on-line Solid-Liquid Extraction and Pre-Column Switching." In Journal of Chromatography Library, 81–143. Elsevier, 1988. http://dx.doi.org/10.1016/s0301-4770(08)60378-4.

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Wyss, Ronald. "[14] Determination of retinoids in plasma by high-performance liquid chromatography and automated column switching." In Methods in Enzymology, 146–55. Elsevier, 1990. http://dx.doi.org/10.1016/0076-6879(90)89285-p.

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Тези доповідей конференцій з теми "Automatic column chromatography"

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Turina, E. L., S. G. Efimenko, Yu A. Kornev та A. P. Liksutina. "Results of Сamelina oil assessment". У РАЦИОНАЛЬНОЕ ИСПОЛЬЗОВАНИЕ ПРИРОДНЫХ РЕСУРСОВ В АГРОЦЕНОЗАХ. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-15.05.2020.35.

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Camelina sativa (L.) Crantz – is an annual oilseed crop in the family Brassicaceae. The aim of the research was to study oil obtained from camelina seeds cultivated in the Crimea. Determination of fatty acid composition was carried out on the gas chromatograph “Хроматэк – Кристалл 5000” (Hromatek - Crystal 5000); automatic dosing unit ДАЖ-2М (DAJ- 2M); capillary column SolGelWax 30m × 0.25 mm × 0.5 μm; carrier gas – helium; speed – 22 centimeters per second; programming temperature –178–230 °С. The preparation of fatty acid methyl esters (FAMEs) using gas-liquid chromatography (GC) was performed in line with the methodology. The content of biologically active substances (tocopherols) in Camelina sativa oil was carried out using thin-layer chromatography (TLC) and spectroscopy. To obtain biofuel, we used the transesterification of triglyceride (or triacylglycerols) of camelina oil with methyl alcohol using potassium hydroxide (or sodium) as a homogeneous catalyst, as well as active metal oxides or enzymes (regiospecific lipase) as heterogeneous catalysts. Camelina sativa oil, obtained from false flax cultivated in the Crimea, should be used, first of all, to ensure healthy, dietary and therapeutic nutrition of the locals and tourists. Since, depending on the variety and the amount of precipitation, it contains 17.89-19.66% of linoleic acid; 33.02-37.06% of linolenic acid; not more than 3.05% of erucic acid. Furthermore, the ratio of omega-3 to omega-6 fatty acids varies from 1.7: 1.0 to 2.2: 1.0 even in wet years. The oil from the winter camelina seeds (‘Penzyak’ variety) in its composition and properties is suitable for the synthesis of biodiesel by the methanolysis reaction using a homogeneous alkaline catalyst. The physical and chemical properties of the obtained biodiesel are similar to those of sunflower or rapeseed oils.
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2

Papathanasiou, Maria M., Athanasios Mantalaris, and Efstratios N. Pistikopoulos. "Advanced control strategies for a periodic, two-column chromatographic process." In 2016 IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR). IEEE, 2016. http://dx.doi.org/10.1109/aqtr.2016.7501359.

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Weidong Li. "Enantiomeric separations of neonicotinoid insecticides on a Chirobiotic V column by high-performance liquid chromatography." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5988524.

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4

AlOudah, Yahya. "Waste Management Control by Applying Novel Method for HPLC Technique to Replace SKALAR Cadmium Reduction Method for Nitrate and Nitrite in Water Analysis." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22291-ea.

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Abstract A new method was developed on High Performance Liquid Chromatography (HPLC) instrument equipped with a Photodiode Array UV detector to determine the Nitrite-Nitrogen and Nitrate-Nitrogen in seawater, industrial wastewater, and groundwater at very low concentrations. This HPLC used a reverse phase system with polar mobile phase and nonpolar C-18 Column. The split mechanism of the HPLC Chromatography was accomplished by employing acetonitrile and acidified water with pH 2.5, at 55:45 ACN: H2O v/v as a mobile phase, long HPLC Column (C-18, 0.5 μm, 250 × 4.6 mm) and at 1 mL/min flow rate. The calibration curves of nitrate-nitrogen and nitrite-nitrogen in the range of 0.05 to 1.0 mg/L were exceptionally linear with correlation coefficients greater than 0.999 and with low Method Detection Limit (MDL) of 0.02 mg/L for both of NO2-n and NO3-n. This developed method also showed comparable results to the ones obtained by the traditional SKALAR instrument which follows ASTM D3867 Automated Cadmium Reduction Method. The results of the nitrate-n and nitrite-n for the Quality Control Samples (QCS) and the average recoveries percentage of the spiked samples demonstrated high accuracy values 99.20% - 101.40% & 98.4% - 99.1% respectively. The very low detection limit is what set this study apart from the previous conducted studies on nitrate and nitrite determination by HPLC. This new developed method is safer and with minimal cost compared to the traditional cadmium reduction method. It doesn't consume water, or require preparation of many hazardous reagents that contain and generate cadmium wastes.
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Meade, J. B., C. M. Noyes, and F. C. Church. "IDENTIFICATION OF LYSINES IN HUMAN THROMBIN ESSENTIAL FOR HEPARIN BINDING AND CLOTTING ACTIVITY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644662.

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We are studying human thrombin (IIa) in order to determine the significance of particular amino acid residues critical for interaction with various substrates and cofactors.Previously, we demonstrated the importance of lysyl residues of Ila during interaction with heparin as well as fibrinogen (Griffith, M.J., (1979) J. Biol. Chem. 254:3401; Church, F.C., et al., (1985) J. Biol. Chem. 260:4936). Identification of these essential lysyl residues in Ila has been approached by chemical modification using the amino group-specific reagent pyridoxal-5'-phosphate (PLP) in the presence and absence of heparin. Ila phosphopyri-doxylated in the absence of heparin (unprotected) showed approximately 2 mols of PLP incorporated per mol of Ila and had greatly reduced inhibition by antithrombin III (ATIII)-heparin as well as reduced clotting activity. Ila phosphopyridoxylated in the presence of heparin (protected) showed approximately 1 mol of PLP incorporated per mol of Ila and had reduced clotting activity but essentially normal inhibition by ATIII-heparin. Both modified thrombins showed normal inhibition by ATIII and heparin cofactor II in the absence of heparin at 25×C and pH 8.0 with apparent second-order rate constant values ranging from 3-5 × 10-5 and 4-6 × 10-4 M-1 min-1, respectively. In contrast to native Ila, neither protected nor unprotected PLP-Ila derivatives bound to a fibrin monomer-agarose column equilibrated at 25×C with 50 mM Tris-HCl, 50 mM NaCl, pH 7.4. Samples of both modified thrombins were reductively denatured, S-carboxymethylated, and hydrolyzed with trypsin at 37×C. The resultant peptide mixtures were separated using reverse-phase high performance liquid chromatography. Peptides showing a high degree of PLP incorporation were sequenced by automated Edman degradation and the modified lysyl residues were identified in the primary sequence of Ila. In unprotected-IIa, lysyl residues 21, 65, 174 and 252 of the B-chain were modified. In heparin-protected-IIa, only Lys 21 and 65 of the B-chain were modified. These results suggest that Lys 174 and 252 of the B-chain of thrombin are essential for binding to heparin and that Lys 21 and/or 65 are essential for clotting activity.
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