Citation: Zheng Hong YANG, Kui WANG, Xiang Tao LIU. THE NATURE AND SOURCE OF ESR SIGNAL IN BILIRUBIN[J]. Chinese Chemical Letters, ;1990, 1(1): 41-44. shu

THE NATURE AND SOURCE OF ESR SIGNAL IN BILIRUBIN

a Research Laboratories of Natural and Biomimetic Drugs Beijing Medical University Postbox 261 Beijing 100083 China;
b Department of Inorganic Chemistry Beijing Medical Universty Beijing 100083 China

Received Date: 8 November 1989

The ESR signals of bilirubin-IXα were studied including the samples treated with free radical generating and inhibiting systems, i.e.X-X0., Fe/EDTA, SOD, mannitol/ascorbate, DTPA, KCN et al.These stable signals all comprise those originated from a semiquinone radical(g=2.0012)and superoxide radical(g₁₁=2.041, g_⊥=2.0040).The latter is shown to be bound with metal ionsespecially iron, chelated by bilirubin.The iron probably comes from bilirubin precursor---hemootobin.Active oxygen free radical scavengers may destroy these radicals.Kinetic curves of regeneration of the bilirubin radicals have been determined.Bilirubin is discussed as"active oxygen trap"in mammatians.
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