摘要:
A cuvette for the determination of a chemical component of a fluid by photo evaluation has two planar-shaped parts parallel to one another at least one of which is transparent in the spectral range used for the evaluation. A planar distance piece of a filamentary reticulation for receiving the fluid therein spaces the planar-shaped parts apart to set the length of the light path through the cuvette for the photo evaluation.
摘要:
The detection and determination of (a) hydrogen peroxide or of a substance which reacts with the formation of hydrogen peroxide or (b) of peroxidase or a peroxidatively active substance, is carried out by contacting an unknown sample with a chromogen and, in case (a), with a peroxidatively active substance or in case (b) with hydrogen peroxide or a substance which reacts with the formation of hydrogen peroxide, and evaluating the coloration produced by the reaction, wherein, as the chromogen, there is used at least one 3,3',5,5'-tetraalkylbenzidine compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which can be the same or different, are straight-chained or branched alkyl radicals containing up to 6 and preferably up to 4 carbon atoms.
摘要:
The subject matter of the present invention are naphthol derivatives having the general formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3 are the same or different and each represents hydrogen, an alkyl or alkoxy group, in which at least one of the residues is a (C.sub.8 -C.sub.30)-alkyl or alkoxy residueR.sup.4 is hydrogen or an alkyl groupR.sup.5 is a nitro group, an alkyl group substituted by halogen, a cyano group, a sulfonamide group or an alkylsulfonyl groupX is nitrogen or the residue CR.sup.6 andY is sulphur or the residue CR.sup.7 =CR.sup.8in which R.sup.6, R.sup.7, R.sup.8 are the same or different and each denotes hydrogen, halogen, a nitro group, a cyano group, an alkyl or an alkyl group substituted by halogen or an alkylsulfonyl group, a process for their production and their use as a pH indicator or in methods and agents for the determination of an ion in an aqueous liquid.
摘要:
The invention relates to a method for determining an ion in an aqueous sample. The method involves contacting the sample with a water immiscible material including an ionophore, a pH indicator and a compound which stabilizes sensitivity of the assay. The ion reacts with the ionophore in the water immiscible material, releasing a proton which reacts with the pH indicator generating a color change which is representative of the ion to be measured. The stabilizing compound stabilizes this change. Also described are compositions including the three recited elements, and various new compounds useful as the stabilizer.
摘要:
The present invention provides a process for removing ascorbic acid from aqueous solutions by the addition of ascorbate oxidase, wherein catalase and hydrogen peroxide are also added to the solution.The present invention also provides an agent for the removal of ascorbic acid from aqueous solutions, based on a solid carrier material impregnated with ascorbate oxidase, wherein the carrier material also contains catalase and hydrogen peroxide and optionally also a stabilizer and/or buffer substance.
摘要:
A diagnostic agent for the detection of occult blood in feces comprising hydrogen peroxide and, as a chromogen, guaiaconic acid A, optionally with a stabilizer. The invention provides, as a novel substance, guaiaconic acid A having a specific extinction E.sub.1 cm.sup.1% at 600 nm of at least 200, determined by the reaction with peroxidase and hydrogen peroxide, having infra-red bands at1600 cm.sup.-1 (m);1505 cm.sup.-1 (v.s.);1260 cm.sup.-1 (s;b);1115 cm.sup.-1 (m);1025 cm.sup.-1 (m); and1200 cm.sup.-1 (s;b)and having an R.sub.F value of 0.45 (toluene/dioxan/glacial acetic acid; 90:25:10 v/v/v).
摘要:
The present invention provides a process for the kinetic determination of .gamma.-glutamyl transferase activity by the reaction of a .gamma.-glutamylarylamide with the formation of an arylamine at a pH value of from 6 to 10, wherein the arylamine is simultaneously reacted with an aromatic amine or phenol appropriate as a coupling component and an appropriate oxidation agent to give a colored compound with an absorption maximum above 565 nm, the rate of formation of which is monitored photometrically and is used as a measure for the .gamma.-glutamyl transferase activity.The present invention also provides a reagent for the kinetic determination of .gamma.-GT activity, wherein it contains the following reagents:.gamma.-GT-arylamide:1-100 mmol/l..gamma.-glutamyl acceptor (glycylglycine):10-500 mmol/l.coupling component:1-500 mmol/l.oxidation agent:0.1-500 mmol/l.buffer:10-1000 mmol/l.
摘要:
Microbiological test device having a nutrient card or cards and a covering layer thereover which is permeable to nutrients but impermeable to bacteria. The covering layer is made from an aqueous dispersion of a water insoluble resin and a pore former.
摘要:
A diagnostic composition comprising a base material and a light colored coating material thereon, wherein the base material has a dark color on its coated side, and the coating material is a finely dispersed microporous plastic applied in a thickness sufficient for the complete masking of the color of the base material, is outstandingly effective in detecting fat or fat-like substances on surfaces by merely contacting the composition with the surface.
摘要:
An apparatus comprising a first porous carrier and a second porous carrier for evaluating biological fluid samples is disclosed. The apparatus is used for separating non high density lipoprotein (non-HDL) from a lipoprotein in a body sample and for determining high density lipoprotein (HDL) cholesterol in a HDL and non high density lipoprotein (non-HDL) in a body sample.