bilirubinoids

bilirubinoids
Generic term denoting intermediates in the conversion of bilirubin to stercobilin by reductive enzymes in intestinal bacteria. Included are mesobilirubin, mesobilane, mesobilene-b, urobilinogen, urobilin, reduction products of mesobilane (stercobilinogen) and mesobilene (stercobilin), and mesobiliviolin; most are found in normal urine and feces. Products related to these intermediates and found in pathological conditions ( e.g., jaundice, liver disease) are the structurally indefinite probilifuscins and propentdyopents found in gallstones.

Medical dictionary. 2011.

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  • l-stercobilinogen — Reduction product of l urobilinogen, precursor of l stercobilin in the final stages of bilirubin metabolism; excreted in feces, wherein it is oxidized to stercobilin. SEE ALSO: bilirubinoids …   Medical dictionary

  • mesobilane — A reduced mesobilirubin with no double bonds between the pyrrole rings and, consequently, colorless. SEE ALSO: bilirubinoids. SYN: mesobilirubinogen, urobilinogen IXα …   Medical dictionary

  • mesobilirubin — A compound differing from bilirubin only in that the vinyl groups of bilirubin are reduced to ethyl groups. SEE ALSO: bilirubinoids. * * * me·so·bili·ru·bin bil ē .rü bin n a red crystalline pigment C33H40N4O6 obtained by reduction of bilirubin * …   Medical dictionary

  • probilifuscins — See bilirubinoids …   Medical dictionary

  • propentdyopents — See bilirubinoids …   Medical dictionary

  • stercobilin — A brown degradation product of hemoglobin, present in the feces. SEE ALSO: bilirubinoids. * * * ster·co·bi·lin .stər kō bī lin n UROBILIN esp a brown levorotatory pigment C33H46 …   Medical dictionary

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