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 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:
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:
Esters and agents including the esters, useful as substrates for esterolytic and/or proteolytic enzymes, said esters being compounds of the general formula: ##STR1## in which R".sub.1, R".sub.2, R".sub.3 and R".sub.4, which may be the same or different, are hydrogen atoms or lower alkyl, lower alkoxy, alkylamino or dialkylamino radicals or in which two adjacent substituents can also represent a fused benzene ring, A is a residue of an amino acid or of a peptide and B is a nitrogen protective group conventional in peptide chemistry or derived therefrom; and the method of preparation and use.
摘要:
Bis-(2,4-dinitrophenyl)-methylpyridinium compounds useful as a pH indicator or for the detection of ammonia having the formula: ##STR1## wherein one of R.sub.1 and R.sub.2 is a bis-(2,4-dinitrophenyl)-methyl radical and the other is a lower alkyl radical;R.sub.2 can also be hydrogen atom or trifluoromethyl;R.sub.3 and R.sub.4 are hydrogen or, together with the carbon atoms to which they are attached, represent a benzene ring; andX.sup..crclbar. is an appropriate acid anionor said compounds are betaines.
摘要:
Rapid diagnostic compositions and methods for the determination of uric acid in body fluids by inversion colorimetry, wherein the indicator used is a radical of the general formula: ##STR1## in which R is a lower alkyl radical and Me is an alkali metal atom or an ammonium group.
摘要:
Protein in body fluids, e.g., urine, is detected by contacting a sample of the body fluid with a diagnostic agent comprising an absorbent carrier impregnated with a pH indicator of the octahalosulfophthalein group, a buffer, and at least one linear or branched chain polypropylene glycol immiscible with water; the resulting test papers are highly sensitive to protein without being subject to interfering effects by nitrogen-containing compounds.
摘要:
Esters and agents including the esters, useful as substrates for esterolytic and/or proteolytic enzymes, said esters being compounds of the general formula: ##STR1## in which R".sub.1, R".sub.2, R".sub.3 and R".sub.4, which may be the same or different, are hydrogen atoms or lower alkyl, lower alkoxy, alkylamino or dialkylamino radicals or in which two adjacent substituents can also represent a fused benzene ring, A is a residue of an amino acid or of a peptide and B is a nitrogen protective group conventional in peptide chemistry or derived therefrom and the method of preparation and use.
摘要:
The present invention provides a process for the detection of redox reactions by introducing a redox reagent system into a test system, wherein a soluble iodate is additionally added to the test system in an amount which is in excess of the highest amount of disturbing reducing agents present in the test system.The present invention also provides a diagnostic agent for the detection of redox reactions containing a redox reagent system, wherein the test system used additionally contains an iodate which is soluble therein in an amount which is in excess of the highest amount of disturbing reducing agents present in the test system.
摘要:
Diagnostic device for the determination of ammonia having a handle, an ammonia indicator layer thereon and an alkaline buffer-containing reaction layer positioned above the indicator layer a distance of 10 to 200 microns by a spacer member. The reaction layer is readily separated from the indicator layer to reveal the latter at the end of the ammonia test.