What's the difference between urobilin and urochrome?
Urobilin
Definition:
(n.) A yellow pigment identical with hydrobilirubin, abundant in the highly colored urine of fever, and also present in normal urine. See Urochrome.
Example Sentences:
(1) The microflora also influence the degradation of mucin, the conversion of urobilin to urobilinogen, of cholesterol to coprostanol, and the production of short chain fatty acids.
(2) The residual part of urobilinogen is further reduced to urobilin, stercobilin and dipyrrolmethenes and excreted in the faeces.
(3) These results point unambiguously to a urobilin structure with one vinyl and one ethyl beta-substituent.
(4) Isomeric forms of mesobiliviolin IXalpha and of i-urobilin IXalpha may also be formed.
(5) Chromic acid degradation of a d-urobilin, obtained after incubation of bilirubin in fecal bacterial cultures, gave methylvinylmaleimide and methylethylmaleimide.
(6) Measurements of the temperature dependence of the circular dichroism spectra of l-stercobilin and d-urobilin show that the conformations of these optically-active urobilinoids change with temperature between 163 and 297 degrees K. These conformational changes depend critically on the hydrogen bonding characteristics of the solvent.
(7) After oxidation of urobilinogen with iodine, the concentration of the resulting urobilin is directly determined from the absorption (or fluorescent) spectrum.
(8) High sensitivity and high specificity for the procedure result from the high value of absorption coefficient and by the characteristic absorption spectrum of zinc complex of urobilin, respectively.
(9) Serial estimations of SGOT and SGPT activity, urine tests for urobilin and bilirubin and haematological investigations were undertaken at frequent intervals.
(10) These results, coupled with those of earlier studies, also establish the absolute configuration of the (+)-urobilin 7 and of the phycobilin 8 at C-7'.
(11) These results indicate establishment of microbes capable of converting bilirubin to urobilins within the second year of life.
(12) This appears to be due to the interference of the large amounts of urobilin present in the urine of these patients.
(13) Previous methods to quantitate urobilinogen lack precision due to either incomplete reduction of urobilin or to losses of pigment before the use of Ehrlich's aldehyde reaction or due to pigment precipitation, as occurs in Schlesinger's fluorescent assay.
(14) i-Urobilin and 1-stercobilin were separated by high-performance liquid chromatography on a reversed-phase octadecylsilane-bonded column and detected fluorimetrically through formation of phosphor with zinc ions in the eluent.
(15) The following biochemical characteristics were studied in feces from children of 0-61 months of age: conversion of cholesterol to coprostanol and bilirubin to urobilins, inactivation of trypsin and degradation of mucin.
(16) With the use of tests for the demonstration of urobilin and urobilinogen in the urine no dependable idea could be found of the status of the pigment fraction in the liver of ketosis-affected cows or the fact that this fraction was involved to a considerable extent.
(17) The present procedure modifies the latter assay to obviate described problems as it is based on direct spectrophotometry (or spectrofluorometry) of a zinc complex of urobilin in dimethylsulfoxide.
(18) This last [corrected] case was negative for both blood and porphyrin in the urine, but positive for excess levels of urobilin, the oxidative product of urobilinogen.
(19) Bilirubin and urobilin, metabolic derivatives of BV, showed slight inhibitory effects on virus replication in the cells.
(20) and paper chromatography) analysis of the oxidized form of the labelled compound allowed its identification as urobilin-i.
Urochrome
Definition:
(n.) A yellow urinary pigment, considered by Thudichum as the only pigment present in normal urine. It is regarded by Maly as identical with urobilin.
Example Sentences:
(1) We found it necessary to introduce several modifications to remove urochromes before HPLC.
(2) However, aldosterone recovery was improved with Method B, which employed several bonded phase silica derivatives (Sepralytes) and a PBE 94 column to remove urochromes before HPLC.
(3) With Method A a more traditional initial procedure was followed, and Sephadex LH-20 chromatography allowed removal of considerable urochromes before HPLC.