Biomaterial Database

Bioluminescent assay for total bile acids in serum with use of bacterial luciferase. 1983

I Styrélius, and A Thore, and I Björkhem

This simple, rapid, sensitive kinetic bioluminescent method for the assay of bile acids in serum involves use of 3 alpha-hydroxysteroid dehydrogenase (EC 1.1.1.50) in combination with a new, commercially available NADH Monitoring Reagent (LKB-Wallac) containing a low activity of NADH:FMN-oxidoreductase and a high activity of bacterial luciferase. Interfering dehydrogenases in serum are inactivated in the test tube with trichloroacetic acid before the assay. The standard curve is linear for concentrations of bile acids up to about 300 mumol/L. With a sample volume of 20 microL, the detection limit is about 0.2 mumol/L. The within-run precision (CV) is about 10%, both at high and low concentrations of bile acids in serum. Correlation is good (r = 0.996) between results by this method and an enzymatic method based on spectrophotometry. However, the latter method is considerably less sensitive, and it is less precise at low concentrations of bile acids.

UI	MeSH Term	Description	Entries
D007202	Indicators and Reagents	Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)	Indicator,Reagent,Reagents,Indicators,Reagents and Indicators
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D008156	Luciferases	Enzymes that oxidize certain LUMINESCENT AGENTS to emit light (PHYSICAL LUMINESCENCE). The luciferases from different organisms have evolved differently so have different structures and substrates.	Luciferase
D008163	Luminescent Measurements	Techniques used for determining the values of photometric parameters of light resulting from LUMINESCENCE.	Bioluminescence Measurements,Bioluminescent Assays,Bioluminescent Measurements,Chemiluminescence Measurements,Chemiluminescent Assays,Chemiluminescent Measurements,Chemoluminescence Measurements,Luminescence Measurements,Luminescent Assays,Luminescent Techniques,Phosphorescence Measurements,Phosphorescent Assays,Phosphorescent Measurements,Assay, Bioluminescent,Assay, Chemiluminescent,Assay, Luminescent,Assay, Phosphorescent,Assays, Bioluminescent,Assays, Chemiluminescent,Assays, Luminescent,Assays, Phosphorescent,Bioluminescence Measurement,Bioluminescent Assay,Bioluminescent Measurement,Chemiluminescence Measurement,Chemiluminescent Assay,Chemiluminescent Measurement,Chemoluminescence Measurement,Luminescence Measurement,Luminescent Assay,Luminescent Measurement,Luminescent Technique,Measurement, Bioluminescence,Measurement, Bioluminescent,Measurement, Chemiluminescence,Measurement, Chemiluminescent,Measurement, Chemoluminescence,Measurement, Luminescence,Measurement, Luminescent,Measurement, Phosphorescence,Measurement, Phosphorescent,Measurements, Bioluminescence,Measurements, Bioluminescent,Measurements, Chemiluminescence,Measurements, Chemiluminescent,Measurements, Chemoluminescence,Measurements, Luminescence,Measurements, Luminescent,Measurements, Phosphorescence,Measurements, Phosphorescent,Phosphorescence Measurement,Phosphorescent Assay,Phosphorescent Measurement,Technique, Luminescent,Techniques, Luminescent
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D006863	Hydrogen-Ion Concentration	The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH	pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D001647	Bile Acids and Salts	Steroid acids and salts. The primary bile acids are derived from cholesterol in the liver and usually conjugated with glycine or taurine. The secondary bile acids are further modified by bacteria in the intestine. They play an important role in the digestion and absorption of fat. They have also been used pharmacologically, especially in the treatment of gallstones.	Bile Acid,Bile Salt,Bile Salts,Bile Acids,Acid, Bile,Acids, Bile,Salt, Bile,Salts, Bile
D013053	Spectrophotometry	The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
D014238	Trichloroacetic Acid	A strong acid used as a protein precipitant in clinical chemistry and also as a caustic for removing warts.	Acide trichloracetique,Rubidium Trichloroacetate,Sodium Trichloroacetate,Acid, Trichloroacetic,Trichloroacetate, Rubidium,Trichloroacetate, Sodium,trichloracetique, Acide
D015096	3-Hydroxysteroid Dehydrogenases	Catalyze the oxidation of 3-hydroxysteroids to 3-ketosteroids.	3-beta-Hydroxysteroid Dehydrogenase,3 Hydroxysteroid Dehydrogenases,3 beta Hydroxysteroid Dehydrogenase,Dehydrogenase, 3-beta-Hydroxysteroid,Dehydrogenases, 3 Hydroxysteroid,Dehydrogenases, 3-Hydroxysteroid,Hydroxysteroid Dehydrogenases, 3