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4920060 |
Device and process for mixing a sample and a diluent
In a chemical analysis system a sample liquid is passed through a non-wetting porous membrane from a reservoir of sample liquid to a flowing stream of diluent which is constantly flowing when the...
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4918024 |
Method for determination of dicyanodiamide in plants or parts of plants
The present invention is a method for determination of dicyanodiamide in a plant matrix, i.e. in a plant or a part of a plant. It involves a series of steps including extracting any dicyanodiamide...
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4913821 |
Method for the determination of phenols in water
A chromatographic method for the determination of individual phenols in water by adding a halogenating agent to the water, e.g., using the bromate-bromide reaction to generate tribromide ions which...
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4908322 |
Derivatization of amines for electrochemical detection
Primary and secondary amines in biological fluids are selectively derivitized by reaction with esters of N-hydroxysuccinimide or N-hydroxysulfosuccinimide to form an N-acylated derivative. Those...
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4908202 |
Use of 2-oxo-1-pyrrolidineacetamide for the determination of the glomerular filtration rate in humans
The use of 2-oxo-1-pyrrolidineacetamide for the determination of the glomerular filtration rate in humans.
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4904603 |
Monitoring drilling mud
The invention in one aspect provides a method of testing drilling mud in use which comprises periodically sampling the circulating mud and analyzing its aqueous filtrate at the rig site by ion...
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4900446 |
Centrifugal fast chromatograph
A centrifugal fast chromatograph is disclosed. The apparatus includes a rotor, a rotor drive, a plurality of chromatographic columns mounted on the rotor, a transfer disk mounted on the rotor,...
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4897176 |
Method of preparing baseoil blend of predetermined coking tendency
A process for preparing a baseoil blend of predetermined coking tendency, and for measuring the effectiveness of additives for reducing coking tendency in baseoils, utilizing the relationship of...
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4897197 |
Using liquid chromatography packing materials
Packing material for use in liquid chromatographic analysis are prepared by contacting a porous support, such as porous silica, with a ketal silane to form ketal blocked diol groups on the surfaces...
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4895809 |
Immobilized antigen-antibody displacement process
A method and apparatus for quantitatively analyzing, in a flowing stream, materials in a biological or chemical sample utilizes immobilized antobodies reversibly precharged with fluorescently...
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4888295 |
Portable system and method combining chromatography and array of electrochemical sensors
A portable system for analyzing a fluid sample includes a small, portable, low-pressure and low-power chromatographic analyzer and a chemical parameter spectrometry monitor including an array of...
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4879247 |
Method and apparatus for isocratic affinity chromatography
The invention relates to a high performance affinity chromatographic system characterized by an immobilized active substance interacting weakly (K diss >10 -3 M) with the desired structure of...
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4877744 |
Qualitative metabolism assessment using high performance thin layer chromatography
A method for the qualitative assessment of oxidative drug metabolism deficiencies, preferably for the qualitative assessment of dextromethorphan metabolism, in a subject comprises analyzing a...
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4872992 |
Method and apparatus for analyzing diluted and undiluted fluid samples
Ion chromatograms are prepared with a chromatograph including a separation column and a conductivity measuring ion detection unit which are adapted to be selectively placed in communication with...
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4869876 |
Multi-purpose plural-oven gas chromatography system with shared controls
A gas chromatography (GC) system includes a primary complete, independently-operable, self-contained GC system and a secondary, dependently-operable GC system. The primary and secondary systems...
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4867947 |
Interface for liquid chromatograph-mass spectrometer
A moving belt interface for real-time, high-performance liquid chromatograph (HPLC)/mass spectrometer (MS) analysis which strips away the HPLC solvent as it emerges from the end of the HPLC column...
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4865991 |
Methods for partitioning of organic flavor compounds
Methods for partitioning and analysis of flavor volatile and other organic components in a food or bioculture composition utilizing acetonitrile-water blends which are cooled to provide a phase and...
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4865746 |
Chromatographic analysis of hydrocarbons
A sample of a hdyrocarbon oil containing asphaltenes is chromatographically analyzed by forming a mixture of the oil with a weak solvent. The mixture is passed in contact with a column of a...
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4865990 |
Protein adsorbent including a colored compound containing a quaternary ammonium especially amidinium or guanidimium cationic group and a cellulose reactive group
A colored compound containing a cationic group and a cellulose reactive group, especially a compound of the formula: A--Y--B I Y'--B ...
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4865996 |
Sorption/desorption method and apparatus
A gas analysis apparatus including a sorption bed and a receiver normally spaced apart from the sorption bed. A given flow path is defined between the sorption bed and the receiver for directing a...
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4863871 |
Method and device for adjusting the cooling temperature of a sample trap in an apparatus for gas chromatographic analysis
This invention concerns a method and a device to perform the adjustment of the cooling temperature of a trap for samples in an apparatus of gas chromatographic analysis. The method according to the...
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4861555 |
Apparatus for chromatographic analysis of ionic species
An apparatus and method for the ion chromatographic analysis of ionic species of a common first polarity opposite to a second polarity employ an eluant ion suppressor cell having two electrodes....
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4855054 |
Using liquid chromatography dual zone packing materials
Dual zone reverse phase packing materials for use in liquid chromatographic blood serum analysis are prepared by contacting a porous support, such as porous silica, with a fluorocarbon silane, such...
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4851355 |
Hydrocarbon group-type analyzer system
A method of analysis by high performance liquid chromatography is provided for obtaining an analysis of three components, namely acyclic paraffins, cycloparaffins and unsaturates, present in a...
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4849110 |
Method and apparatus for liquid chromatography
The invention relates to a liquid chromatography based on a very small liquid feeding rate, where a liquid sample containing components to be detected, such as anion species, is mixed with an...
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4847207 |
Process for detection of organosulfur compounds and apparatus therefor
An organosulfur compound is detected and/or quantified, optionally in admixture with one or more other compounds, by reacting the organosulfur compound with gaseous fluorine at sub-atmospheric...
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4843020 |
Method for detecting tetrahydrocannabinol in human urine involving melanin precipitation
An improved method for the detection of tetrahydrocannabinol in human urine wherein the pigment melanin is precipitated out of the urine prior to analysis with a solution of nitroferricyanide so...
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4843016 |
Detection system and method
A detection system for detecting the presence of predetermined compounds in a sample. The system comprises a sample injection means, a chromatographic column, a conversion means and one or more...
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4837161 |
Method for reagent addition to a flowing liquid carrier stream
An analytical chemistry apparatus and method for introducing a reagent into a flowing stream of liquid carrier in order to quantitatively analyze one or more components of a sample added into the...
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4837166 |
Assaying method for primary amines using aromatic dialdehydes
A method of assaying primary amines or cyanide is disclosed. The process is carried out by reacting a substituted or unsubstituted naphthalene-2,3-dicarboxaldehyde or o-phthalaldehyde, reactive...
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4837157 |
Sample preparation method for liquid chromatography
A plurality of analytes are analyzed by liquid chromatography in a liquid biological sample containing many components which can interfere with analysis by liquid chromatography. The sample,...
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4835109 |
Process and apparatus for chemical analyses by liquid chromatography
A process and an apparatus for performing analyses in liquid chromatography, by ways of a pump capable of drawing a fluid and injecting it at high pressure, through at least a control valve, into a...
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4835107 |
Method for the concentration and separation of actinides from biological and environmental samples
A method and apparatus for the quantitative recover of actinide values from biological and environmental sample by passing appropriately prepared samples in a mineral acid solution through a...
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4828799 |
Therapeutic drug monitoring and analyte determination utilizing micellar chromatography
A method for the determination of the drug or other analyte content and concentration in bodily fluids that are directly injected in a micellar chromatographic column. Various embodiments of kits...
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4829008 |
Analytical instrument with apparatus for sample concentrating
A system for analysis of trace concentrations of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes...
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4822744 |
System and method for detecting contaminants in a steam power generating system
Method for monitoring changes in contaminant concentration levels between a feedwater inlet and a steam outlet in a steam generating system and system for detecting sources of contaminants in a...
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4818704 |
Method for the separation and determination of enantiomeric amine compounds using an optically active agent
The invention relates to a new chiral reagent of the formula ##STR1## wherein X is halogen, an azide group or a succinimidyl group and wherein R is an alkyl group or a trifluormethyl group. The...
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4814281 |
Differential conductivity sulfate monitor
A differential conductivity sulfate monitor for determining the sulfate concentration of a fluid sample by monitoring the cation conductivity of the fluid sample before and after sulfate has been...
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4814280 |
Plasma and hemoglobin-associated acetaldehyde as a marker of alcohol use
An improved fluorigenic, high-performance, liquid chromatography (HPLC) assay comprises reacting plasma and hemolysate samples with cyclohexanedione in the presence of ammonium ion to form a...
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4810471 |
Vacuum manifold for extraction processing
A vacuum manifold for solid phase extraction of a plurality of liquid samples from reagent tubes removably connected by valves to a vacuum chamber through a removable vacuum tight cover closing. A...
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4808540 |
Method for chromatographical analysis of anions
Anions in an aqueous solution can be quantitatively measured at a high sensitivity while controlling the electroconductivity possessed by an eluant to a low level, by the chromatographical...
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4806485 |
Method of improving the detection limits of UV-VIS absorbing compounds in HPLC by the use of a singlet oxygen trap
A post-column photochemical reaction method to improve the detection limits of compounds which absorb radiation in the range of 240 nm to 800 nm has been developed for high performance liquid...
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4804455 |
Electrochemical testing system
The instant invention provides in one aspect porous frit electrodes having improved efficiencies. In another aspect the invention provides inert metal reference and/or counter electrodes a method...
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4801430 |
Interface for separating an analyte of interest from a liquid solvent
An interface generally useful for liquid chromotography systems and methods is provided for the separation of an analyte of interest from a liquid solvent. The interface provides for separation and...
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4800223 |
Quinoxalinone derivatives and analytical method using said compounds
A quinoxalinone derivative of the following formula: ##STR1## where R 1 and R 2 are each methyl, ethyl or propyl; and R 3 is a chlorine atom or azide, is a reagent capable of high-sensitivity...
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4794088 |
Method and apparatus for separating and analyzing using liquid chromatography
A method and apparatus for separating and analyzing using liquid chromatography, wherein an eluate from a chromatographic column is treated by dialysis using an amphoteric ion exchange membrane.
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4786475 |
Equipment for the simulated distillation by means of gas chromatography with non vaporizing direct injection
The invention concerns a method and an equipment for the simulated distillation, by means of gas chromatography, of petroleum products, capable of characterizing also high boiling products,...
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4784962 |
Mixture of amino acid derivatives, process of producing the mixture and use of the mixture for quantitative determination of the amino acids
A mixture of fluorescently-excitable amino acid derivatives suitable for use in quantitative amino acid analysis is provided in which primary amino acids are present as derivatives of a first...
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4775476 |
Method for membrane assisted liquid chromatography
Apparatus and method for extracting a component from a sample across a membrane into an extractant and then injecting the extracted sample component into a chromatographic eluent and onto a...
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4774190 |
Apparatus and method for exchanging substances between fluids
Apparatus and method are provided for the exchange of substances between substance carrier and recovery fluids in predetermined carrier/recovery fluid volumetric ratios, and operate through the...
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