摘要:
The present invention provides a method for the measurement of an analyte in biological samples whereby an uncompetitive inhibitor is coupled to a ligand and utilized in a homogeneous assay. The analyte can be a drug or drug derivative, hormone, polypeptide, or oligonucleotide. The present invention also provides novel compounds, assay reagents and packaged kits useful for performing such measurements.
摘要:
The present invention provide a method for assessing the sensitivity to a pyrimidine drug such as 5-FU which is degraded in the pyrimidine metabolic pathway, specifically in vivo pyrimidine metabolizing activity, of an individual subject; and a preparation useful for the assessment. The present invention can be carried out by: administering a preparation comprising as an active ingredient a pyrimidine compound or its metabolite which acts as a substrate for a pyrimidine metabolizing enzyme, in which compound or metabolite at least one of C, O and N is labeled with an isotope; and assessing in vivo pyrimidine metabolizing activity based on the amount of excreted metabolite.
摘要:
Stabilized aqueous solution of a coenzyme for hydrogen-transferring enzymes characterized in that the solution contains NAD, NADP or a derivative thereof in an oxidized or reduced form and one or several organic compounds or salts thereof having a pKa value between 1.5 and 6.0 and/or a nitrogen compound of the general formula (I) 1 in which the residues R1, R2 and R3 are the same or different and denote hydrogen, or a saturated or unsaturated alkyl or aryl group as well as the use of the solution to determine dehydrogenases in particular lactate dehydrogenase or substrates thereof.
摘要:
Disclosed are a method and a corresponding kit for determining the cytotoxicity of a test agent. The method includes the steps of adding a pre-determined amount of the test agent to a vessel containing living cells in culture medium. The cells are then incubated for a pre-determined amount of time. To the cells and culture medium is then added a reagent mixture that is non-toxic to the living cells. In the preferred embodiment, the reagent mixture contains a solvent, a dye, an electron transfer agent, a substrate for a cytoplasmic enzyme having a half-life greater than two hours and NADnull. The contents of the vessel are then measured for production of the reduced state of the dye, the production of the reduced state of the dye being caused by a cytoplasmic enzyme specific for the substrate in the reagent mixture. In the preferred embodiment, the production of the reduced state of the dye is caused by lactate dehydrogenase released from dead and dying cells within the vessel. The kits contain components necessary for performing the method.
摘要:
Stabilized tetrazolium dye-phenazine reagent compositions and methods for their use in the measurement of an analyte in a sample are provided. The subject reagent compositions include: (1) a tetrazolium dye component, e.g., a water soluble tetrazolium salt; (2) a phenazine component; and (3) an effective amount of one or more tetrazolium dye-phenazine stabilizing reagents, e.g., an inorganic Group IIIA compound and/or a flavin. In many embodiments, the subject reagent compositions include additional members of an analyte oxidizing signal producing system, such as: an analyte oxidizing enzyme, e.g., an analyte dehydrogenase or an analyte oxidase; and an enzyme cofactor. Also provided are test strips that include the subject reagent compositions, as well as systems and kits incorporating the subject test strips. The subject reagent compositions, test strips, systems and kits find use in the detection of a wide variety of analytes in a sample, such as a physiological sample, e.g., blood or a fraction thereof, or ISF (interstitial fluid).
摘要:
Disclosed is a hybrid enzyme containing a foreign peptide, the hybrid enzyme having an enzyme activity similar to that prior to the substitution or insertion of the peptide, and having a property that the hybrid enzyme activity is modulated or modified when a material having binding ability to the peptide introduced by substitution or insertion is bound to the peptide moiety. Using the hybrid enzyme, it becomes possible to assay a trace amount of CRP in a sample by a homogeneous colorimetry, and a macromolecule materials can be easily assayed in a homogeneous system.
摘要:
The present invention is a method for screening and identifying therapeutic agents for the treatment of macular or retinal degeneration. The candidate substances preferably reduces the activity of 11-cis-retinol dehydrogenase. In vitro and in vivo studies administering the inhibitor molecules to abcr knockout mice and analyzing for the inhibition of lipofuscin (A2E) accumulation are contemplated.
摘要:
The present invention relates to proteins involved in inflammatory processes and the modulation of the function of such a protein in order to positively influence inflammatory diseases.
摘要:
This invention provides a method for the determination of bicarbonate ion existing in liquid using phosphenolpyruvate carboxylase and malate dehydrogenase as conjugate enzyme wherein thioNAD(P)H is used as substrate of malate dehydrogenase. The use of the thioNAD(P)H enables the measurement with visible light, and enables the simple and accurate determination of bicarbonate ion concentration of biological liquid sample in the clinical test.
摘要:
Stabilized tetrazolium dye reagent compositions and methods for their use in the measurement of an analyte in a sample are provided. The subject reagent compositions include a tetrazolium dye component, e.g., a water soluble tetrazolium salt, and an effective amount of a nitrite stabilizing agent, e.g., a nitrite salt. In many embodiments, the subject reagent compositions include additional members of an analyte oxidizing signal producing system, such as: an analyte oxidizing enzyme, e.g., an analyte dehydrogenase or an analyte oxidase; an electron transfer agent; and an enzyme cofactor. Also provided are test strips that include the subject reagent compositions, as well as systems and kits incorporating the subject test strips. The subject reagent compositions, test strips, systems and kits find use in the detection of a wide variety of analytes in a sample, such as a physiological sample, e.g., blood or a fraction thereof, or ISF (interstitial fluid).