Influence of bilirubin on the antioxidant capacity of plasma in newborn infants

Biol Neonate. 1997;71(4):233-8. doi: 10.1159/000244422.


In vitro, bilirubin is a strong antioxidant, but in vivo its capacity to act as a scavenger of toxic oxygen radicals remains poorly documented. The aim of this study was to evaluate of bilirubin had antioxidant properties in jaundiced infants. The antioxidant capacity of neonatal plasma was measured in Trolox equivalents (TEAC, mmol/l) and correlated in vitro with plasma bilirubin concentrations (r2 = 0.99). Plasma TEAC was compared before and after exchange transfusions for neonatal hyperbilirubinemia (250-435 mumol/l). The antioxidant properties of the paired blood samples before and after exchange transfusions (TEAC: 1.67 +/- 0.12 vs. 1.37 +/- 0.09 mmol/l, n = 11) varied in proportion to the serum bilirubin levels. The changes in other antioxidants were not large enough to account for the magnitude of change in antioxidant capacity. Therefore, in vivo, the plasma antioxidant capacity of jaundiced newborn infants is related to the level of bilirubin.

Publication types

  • Clinical Trial
  • Comparative Study
  • Controlled Clinical Trial

MeSH terms

  • Analysis of Variance
  • Antioxidants / analysis
  • Antioxidants / metabolism*
  • Bilirubin / blood*
  • Bilirubin / physiology*
  • Exchange Transfusion, Whole Blood
  • Humans
  • Infant, Newborn
  • Iron / blood
  • Jaundice, Neonatal / blood*
  • Jaundice, Neonatal / physiopathology
  • Sulfhydryl Compounds / blood


  • Antioxidants
  • Sulfhydryl Compounds
  • Iron
  • Bilirubin