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Topic: Chromatographic

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	Reversed phase chromatographic process - Patent 5204005
		Preferably, the chromatographic packing material is a bonded phase chromatographic packing material such as a silanized material consisting of octadecylsilane bonded to solid silica support particles and having a carbon content between approximately 13 and 16% and a particle size between approximately 37 and 63.mu..
		In addition, a chromatographic packing material in which a stationary phase is not chemically bonded to solid support particles, such as a hydrocarbon impregnated silica gel in which the hydrocarbon is adsorbed onto the surface of the gel, may also be employed.
		The chromatographic column was then flushed with a mixture of methyl alcohol and water which contained at least 50% methyl alcohol to remove nonionic compound impurities from the column and regenerate the column for reuse.
	www.freepatentsonline.com /5204005.html (4422 words)

	Guide to specification for: General notices; General analytical techniques; Identification tests; Test solutions and ... (Site not responding. Last check: 2007-09-07)
		Chromatographic systems achieve their ability to separate mixtures of chemicals by selectively retarding the passage of some compounds through the stationary phase while permitting others to move more freely.
		The spotted chromatographic sheet is suspended in the chamber by use of the antisiphoning rod and an additional heavy glass rod that holds the upper end of the sheet in the solvent trough.
		After chromatographing, a calibration curve is constructed by plotting the area ratios of the standard solutions (area of analyte standard per area of internal standard) versus the weight or concentration ratios of each standard.
	apps3.fao.org /jecfa/additive_specs/docs/t0368e/T0368e03.htm (9570 words)

	Chromatographic technique and apparatus - Patent 5135549
		In another class of gas chromatographic techniques, known as thermal modulation, sample is permitted to accumulate in a relatively cool portion of column, the exterior of which section carries a thin, electrically connected heater, and then released by heating to generate a sharp or spatially compact concentration pulse.
		The chromatographic data may be displayed in a three-dimensional manner with a retention parameter of the first column comprising one axis, a retention parameter of the second column comprising a second axis, and signal intensity comprising a third axis.
		To orthogonalize a comprehensive two-dimensional gas chromatographic separation, an adjustment of experimental parameters is made in the second dimension of chromatographic separation as a function of progress of the first dimension of chromatographic separation such that substances emerging from the first dimension fall within a defined range of retention times on the second dimension.
	www.freepatentsonline.com /5135549.html (16828 words)

	Chromatography Page 32 (Site not responding. Last check: 2007-09-07)
		Chromatographic column similar to 5884 except with porosity B (70-100 microns) fritted disc
		Chromatographic column with 2 mm bore 1:5 taper solid PTFE stopcock plug at bottom.
		Chromatographic column similar to 5888 except with porosity B fritted disc sealed in.
	www.aceglass.com /html/Chroma/32.html (92 words)

	MIPs As Chromatographic Stationary Phases for Molecular Recognition
		This demand is driven by the sometimes markedly different biological activities of the enantiomers of a given compound and increasingly stringent regulations regarding optically active molecules.
		When MIPs are used for chromatographic separations (Figure 1), the isomer used in the preparation of the MIP is always the one that is more strongly retained; therefore, the elution order is predictable.
		Chromatographic evaluation of this column showed a corrected selectivity of 6.8 between the template pentamidine (PAM, a drug used to treat AIDS-related disorders) and the reference compound benzamidine (BAM) at a flow rate of 0.3 mL/min (30).
	www.chem.orst.edu /remcho/publications/analchem71.htm (4188 words)

	Method for fractionating a solution - US Patent 6224776 (Site not responding. Last check: 2007-09-07)
		The chromatographic SMB method of the present invention enables a more efficient use of the resin, resulting in higher capacity at a given product recovery, purity and resin volume or alternatively, higher product purity is achieved at the same capacity as in prior processes.
		In the method, betaine and sucrose are separated during the same sequence comprising a molasses feeding phase wherein the molasses feedstock is supplied to one of said partial packed beds and eluent water is supplied substantially simultaneously to another of said partial packed beds, an eluent feeding phase, and a circulating phase.
		The chromatographic apparatus employed in the present invention comprises one column or several columns connected in series, fluid conduits connecting the columns, solution and eluent containers, feed and eluent conduits, recycle and feed pumps, heat exchangers, product fraction withdrawal conduits, and valves, flow and pressure regulators and on-line concentration, density, optical activity and conductivity meters.
	www.patentstorm.us /patents/6224776.html (9202 words)

	Chromatographic Identification of Amino Acids
		Chromatographic separation techniques are based upon the physical principles of either adsorption and/or partitioning of the solute between the mobile and stationary phases.
		Two commonly employed chromatographic separation techniques are paper chromatography and thin layer chromatography (TLC).
		Greater discriminating power may be achieved by using more sophisticated instrumental chromatographic techniques such as gas chromatography and High Performance Liquid Chromatography.
	people.clarkson.edu /~jimbo/2004/controlled.htm (1896 words)

	DSP Development Corporation (Site not responding. Last check: 2007-09-07)
		Indeed, verifying good chromatographic performance serves to validate the quantitation that is subsequently performed during determination of an unknown component in a mixture.
		Chromatographic figures of merit are most readily and reliably obtained by statistical moment analysis [2].
		Figure 5A is a raw chromatographic signal (expanded view) from a derivatized mixture of C14, C16, C18, C20, C22 and C24 fatty acids, separated by reversed phase Micro LC.
	www.dadisp.com /chromato.htm (3149 words)

	Chromatographic analysis (Site not responding. Last check: 2007-09-07)
		High-pressure liquid chromatographic analysis of BMY-28142 in plasma and urine....
		A sample injection port for the gas-liquid chromatographic analysis of irradiate...
		Gas-liquid chromatographic analysis of free long-chain aldehydes -- Wood and Har...
	www.scienceoxygen.com /chem/218.html (214 words)

	Ruia..........Research publications (Site not responding. Last check: 2007-09-07)
		Gas Chromatographic determination of Nitrazepam and Diazepam from pharmaceutical preparations.
		High Performance Liquid Chromatographic is determination of Diclofenac Sodium from pharmaceutical preparations.
		Gas chromatographic determination and separation of Isomers of Cresol from pharmaceutical preparation.
	www.ruiacollege.edu /research3.htm (617 words)

	Chromatographic column packing - Patent 4159966
		A gas or liquid chromatographic column packing material prepared by reacting an activated, i.e., active hydrogen-containing, silica and/or alumina support with a reactive hydrogen-containing partitioning agent.
		The activated silica and/or alumina support is prepared by reacting a Group III metal hydride (boron, aluminum, gallium or indium hydride) with a hydrated silica and/or alumina (a siliceous or aluminaceous mineral having surface hydroxyl groups or a synthetic siliceous or alumina having surface hydroxyl groups).
		For example, in the preparation of a chromatographic column packing it is usually advantageous to react methanol or ethanol with the activated support to deactivate any unreacted hydrogen atoms of said hydride moieties on the support.
	www.freepatentsonline.com /4159966.html (1429 words)

	Calgon Carbon Engineered Solutions: Separation
		A CSEP® can to be used to make a continuous chromatographic separation of betaine from a beet sugar solution, using an ion exclusion process.
		A CSEP® can be used to make a continuous chromatographic separation of mannitol from a stream containing other sugars, such as sorbitol.
		CSEPs® are used to separate and recover tocopherols from natural sources using a range of continuous chromatographic separation processes.
	www.solventseparation.com /ccc/tech/application/separation.html (466 words)

	Chromatographic Reagents
		Official and proposed chromatographic procedures in USP–NF and Pharmacopeial Forum (PF) refer to column reagents only by 'L,' 'S,' or 'G' designations.
		Chromatographic Reagents can save chemists and scientists valuable laboratory time spent searching for the right columns to use in testing.
		It provides the brand names and manufacturers of column reagents used in validating all gas and liquid chromatographic procedures in the USP 29–NF 24 main edition, as well as in Pharmacopeial Forum issues from January–February 1980 through September–October 2005.
	www.usp.org /products/chromatographic.html (167 words)

	Chromatographic Theory
		Of course, this is merely a convient means of expresssing column resolution because phycial plates don't actually exist in the chromatographic column.
		In a chromatographic column the plates are replaced by either column packing or a column coating.
		In a chromatographic column you measure the peak widths and calculate the number of plates in a given length of column.
	www.instrumentalchemistry.com /theory/pages/distillation.htm (309 words)

	High-performance liquid chromatographic assay of amiodarone in rat plasma
		A high-performance liquid chromatographic method is described for the determination of amiodarone in rat plasma.
		The lower limits of quantitation and the small plasma sample necessary for this assay was ideal for studying amiodarone pharmacokinetics in the rat.
		Moor M.J.;Wyss P.A. and Bickel M.H., New procedure for the high-performance liquid chromatographic determination of amiodarone and desethylamiodarone with solid-phase extraction of rat plasma and tissue samples.
	www.ualberta.ca /~csps/JPPS4(3)/D.Brocks/hplc.htm (2405 words)

	CHROMATOGRAPHIC AND MASS SPECTRAL METHODS OF IDENTIFICATION FOR THE SIDE CHAIN AND RING (Site not responding. Last check: 2007-09-07)
		The popular drug of abuse 3,4-methylenedioxymethamphetamine (3,4-MDMA) is one of a total of ten regioisomeric 2,3- and 3,4-methylenedioxyphenethylamines of molecular weight 193 yielding regioisomeric fragment ions of equivalent mass (m/z 58 and 135/136) in the electron impact mass spectrum.
		In the electron impact mass spectra the side chain regioisomers show some variation in the relative intensity of the major ions with only one or two minor ions which might be considered side chain specific fragments.
		Chromatographic separation of these ten uniquely regioisomeric amines were studied using reversed phase liquid chromatographic methods using gradient elution and by gas chromatographic techniques using temperature program optimization.
	www.auburn.edu /~clarkcr/big10hmpg.html (251 words)

	Software Routines for Benefiting from Generic Chromatographic Methods
		Chromatographers apply one or more "standard" methods that are designed to provide "sufficient" separation for LC-MS or LC-NMR verification of compounds and/or semi-prep scale collection of components in a mixture.
		ACD/ChromGenius is a chromatographic software system that has been designed for "batchwise" evaluation of compounds to permit high-throughput method selection and accurate retention time prediction.
		A large number of varied structures injected under a limited number of chromatographic systems enable the software to "quantify" the method at an unprecedented level based on predicted physicochemical parameters.
	www.acdlabs.com /publish/acs02_chrgen.html (215 words)

	Chromatographic Separation
		In the chromatographic process a mixture of compounds are injected into the system in either the gas or the liquid phase.
		The sample mixture is introduced into the system at the injection port and a mobile phase of gas or liquid flowing through the system carries the compounds into the column.
		What this means is that the width of each chromatographic peak, representing a sample component, broadens with increasing time in the column.
	www.uga.edu /srel/AACES/GCtutorial/page1.html (244 words)

	Basic chromatographic relationships (Site not responding. Last check: 2007-09-07)
		In the previous sections the thermodynamic theory of chromatographic retention was discussed.
		Dead volume is the total volume of the liquid phase in the chromatographic column.
		If we equilibrate the system at the certain binary eluent composition and inject a small amount of the same eluent with a small difference in the composition, then the injected "disturbance" will move through the column according to the basic retention equation.
	hplc.chem.shu.edu /BOOK/html/theory/th_chrrl.html (631 words)

	Chromatographic Reagents (Site not responding. Last check: 2007-09-07)
		Chromatographic Reagents helps to increase accuracy and consistency of results while conducting official tests and assays.
		The 2003 edition of Chromatographic Reagents provides the brand names and manufacturers of column reagents used in validating all gas and liquid chromatographic prodedures in the USP 27—NF 22 main edition as well as in Pharmacopeial Forum issues through October 31, 2003.
		The list of column brand names in Chromatographic Reagents is updated bimonthly through special supplements published in the Pharmacopeial Forum.
	www.ramex.com /title.asp?id=8807 (403 words)

	[No title] (Site not responding. Last check: 2007-09-07)
		In addition, the user must identify chromatographic conditions that will maintain the sharpness of analyte bands as a sample moves through the stationary phase column to the detector.
		The capacity factor is a derived unit which allows comparison of LC behavior of solutes in different chromatographic systems (in fact there is some controversy as to whether this measure is truly comparable for species with very different chemical characteristics).
		stainless steel chromatographic column is packed with a homogeneous bed of uniform spherical silica gel particles which are 5 microns in diameter with a pore size of 120 Å.
	www.chem.duke.edu /~reese/exp1/exp1.html (5698 words)

	Chromatographic data with retention time shifts (Site not responding. Last check: 2007-09-07)
		The molecular entities of thick juice samples were separated by size on a chromatographic system and detected by fluorescence in the hope that the individual fluorophores could be separated and detected.
		It is not uncommon that analysis of chromatographic data is hampered by retention time shifts.
		Retention time shifts causes the chromatographic profiles of specific analytes to be dissimilar from run to run.
	www.models.kvl.dk /users/rasmus/data/chromat_flu/chromflu.htm (476 words)

	Chromatography - Introductory theory
		It is often found that the analyte of interest must be separated from the myriad of individual compounds that may be present in a sample.
		A more realistic description of the processes at work inside a column takes account of the time taken for the solute to equilibrate between the stationary and mobile phase (unlike the plate model, which assumes that equilibration is infinitely fast).
		The resulting band shape of a chromatographic peak is therefore affected by the rate of elution.
	www.shu.ac.uk /schools/sci/chem/tutorials/chrom/chrom1.htm (1187 words)

	Astec
		Plesek, J., Bruner, B., Liquid Chromatographic Resolution of Enantiomers of Deltahedral Carborane and Metallaborane Derivatives, J. of Chromatogr., 626, 197-206 (1992).
		Kuijpers, P.H., Gerding T.K., de Jong, G.J., Improvement of the Liquid Chromatographic Separation of the Enantiomers of Tetracyclic Eudistomins by the Combination of α-cyclodextrin Stationary Phase and Camphorsulphonic Acid as Mobile Phase Additive, J. of Chromatogr., 625, 223-230 (1992).
		Furuta, R., Nakazawa, H., Liquid Chromatographic Separation of the Enantiomers of Diniconazole Using α-cyclodextrin-bonded Column, J. of Chromatogr., 625, 231-235 (1992).
	www.astecusa.com /l_chromatography/cyclobond_references.htm (4511 words)

	ARS \| Publication request: Evaluation of Analyte Protectants to Improve Gas Chromatographic Analysis of Pesticides (Site not responding. Last check: 2007-09-07)
		This widely known phenomenon is called "matrix-induced chromatographic response enhancement." Several approaches have been proposed to minimize peak distortion phenomena and compensate for matrix-induced effects, which is especially important for accurate quantitation, but each approach has serious limitations for routine multi-pesticide analysis.
		The protecting agents are added to extracts and standards alike to provide the chromatographic enhancement effect even for the most susceptible analytes in clean solvents (even in a very dirty GC system).
		Dramatic peak enhancements were achieved using compounds containing multiple hydroxy-groups, and gulonolactone appears to be the most effective protecting agent for the most pesticides that we tested.
	ars.usda.gov /research/publications/publications.htm?seq_no_115=138520 (608 words)

	Modelling and Simulation of Nonlinear Chromatographic Separation Processes: A Comparison of Different Modelling ...
		Abstract: Chromatographic processes provide a powerful tool for the separation of multicomponent mixtures in which the components have di!erent adsorption a$nities.
		Mathematical modelling and simulation of batch chromatographic processes is widely documented in the literature.
		Modelling and simulation of nonlinear chromatographic separation processes: A comparison of different modelling approaches.
	citeseer.ist.psu.edu /dunnebier00modelling.html (500 words)

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