摘要:
Provided is a method for simply and accurately measuring sphingomyelin in a sample, and a kit therefore. The method is a method for measuring sphingomyelin in a sample, comprising reacting the sample with a phospholipase D which does not react with sphingomyelin and lysophosphatidylcholine but reacts with phosphatidylcholine, a lysophospholipase or a monoglyceride lipase, and a choline oxidase, eliminating the formed hydrogen peroxide, reacting the resultant with a phospholipase D which does not react with glycerol-3-phosphorylcholine and free fatty acid but reacts with sphingomyelin, and a choline oxidase, and measuring the formed hydrogen peroxide.
摘要:
Provided is a method for simply and accurately measuring sphingomyelin in a sample, and a kit therefor. The method is a method for measuring sphingomyelin in a sample, comprising reacting the sample with a phospholipase D which does not react with sphingomyelin and lysophosphatidylcholine but reacts with phosphatidylcholine, a lysophospholipase or a monoglyceride lipase, and a choline oxidase, eliminating the formed hydrogen peroxide, reacting the resultant with a phospholipase D which does not react with glycerol-3-phosphorylcholine and free fatty acid but reacts with sphingomyelin, and a choline oxidase, and measuring the formed hydrogen peroxide.
摘要:
The present invention provides a method, a reagent and a kit for simple and sensitive determination of cholesterol in remnant-like particles without separation of components of a sample. A method for quantitatively determining remnant-like particle cholesterol in a sample, which comprises: in an aqueous medium containing the sample and in the presence of a combination of specific surfactants and a phospholipid-hydrolyzing enzyme, allowing remnant-like particle cholesterol in the sample to react with cholesterol esterase and cholesterol oxidase or cholesterol dehydrogenase (in the presence of oxidized coenzyme); and determining the formed hydrogen peroxide or reduced coenzyme.
摘要:
Disclosed are a method for quantitative determination of bilirubin and a reagent for the method, which are useful in clinical examinations. The method comprises subjecting the bilirubin in a sample to coexist with ascorbate oxidase and a reaction promoter in aqueous medium to thereby oxidize the bilirubin, measuring the change in absorbance of the aqueous medium and comparing the change in absorbance with a calibration curve. The reagent comprises ascorbate oxidase and a reaction promoter.
摘要:
Provided are a method of determining the amount of cholesterol in high-density lipoprotein (HDL), which comprises measuring the amount of cholesterol in low-density lipoprotein (LDL), very-low-density lipoprotein (VLDL) and chylomicron (CM) in a sample in the presence of a sugar compound and/or a protein solubilizing agent, and calculating the difference between the amount of cholesterol in LDL, VLDL and CM and the total amount of cholesterol in the sample, and a method of determining the amount of cholesterol in HDL, which comprises measuring the amount of cholesterol in HDL in a sample in the presence of a sugar compound and/or a protein solubilizing agent.
摘要:
The present invention provides a method for simple and accurate measurement of cholesterol in remnant-like lipoprotein (RLP) (RLP-C) in a sample, which comprises the steps of: (i) eliminating cholesterol in lipoproteins other than RLP by reacting the sample with cholesterol oxidase, or cholesterol dehydrogenase and oxidized coenzyme, in an aqueous medium comprising surfactant A; (ii) reacting the reaction solution from which cholesterol in lipoproteins other than RLP has been eliminated in the above step (i) with cholesterol esterase and cholesterol oxidase, or cholesterol esterase, cholesterol dehydrogenase and oxidized coenzyme, in the presence of surfactant B to form hydrogen peroxide or reduced coenzyme; and (iii) measuring the hydrogen peroxide or reduced coenzyme formed in the above step (ii).
摘要:
The present invention provides a method, a reagent and a kit for simple and sensitive determination of cholesterol in remnant-like particles without separation of components of a sample. A method for quantitatively determining remnant-like particle cholesterol in a sample, which comprises: in an aqueous medium containing the sample and in the presence of a combination of specific surfactants and a phospholipid-hydrolyzing enzyme, allowing remnant-like particle cholesterol in the sample to react with cholesterol esterase and cholesterol oxidase or cholesterol dehydrogenase (in the presence of oxidized coenzyme); and determining the formed hydrogen peroxide or reduced coenzyme.
摘要:
According to the present invention, esterified and free cholesterol in very low-density lipoprotein remnant (hereinafter collectively referred to as very low-density lipoprotein remnant cholesterol) in a sample is determined in an aqueous medium containing the sample in the presence of a combination of (a) a polyoxyethylene-polyoxyalkylene alkylaryl ether and (b) one kind of surfactant selected from the group consisting of a polyoxyethylene-polyoxybutylene copolymer, a polyoxyethylene styrenated-phenyl ether and a polyoxyalkylene long-chain alkyl ether which combination is capable of causing cholesterol esterase and cholesterol oxidase or cholesterol dehydrogenase to act specifically on very low-density lipoprotein remnant cholesterol.
摘要:
Provided is a method of determining the amount of cholesterol in high-density lipoprotein (HDL), which comprises reacting an HDL-containing sample with cholesterol esterase and cholesterol oxidase or cholesterol dehydrogenase in the presence of a reagent for aggregating lipoproteins except HDL, and determining the amount of hydrogen peroxide or reductive co-enzyme formed therein.
摘要:
The present invention provides a simple and sensitive aqueous method for determining cholesterol in remnant-like particles in a biological sample without the separation of components of the sample. The method comprises contacting the sample with (i) cholesterol esterase, (ii) cholesterol oxidase or cholesterol dehydrogenase, and (iii) phospholipase with a surfactant that inhibits cholesterol oxidase or cholesterol dehydrogenase in lipoproteins other than remnant-like particles in the presence of oxygen or an oxidized coenzyme. Formed hydrogen peroxide or reduced coenzyme is measured and correlated to a quantitative determination of cholesterol in remnant-like particles.