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Gas phase decomposition of bilirubin-derived anions.

Bilirubin (BR) is a tetrapyrrolic yellow-orange pigment, produced by the metabolic breakdown of heme. The characteristic feature of bilirubin structure are intramolecular hydrogen bonds which affect the physicochemical properties of bilirubin, e.g. pKa, solubility, lipophilicity. [1-6] Since bilirubin contains two carboxyl group, it may form deprotonated and dideprotonated species, namely the ions [BR-H] and [BR-2H] 2and these ions exhibit different biochemical properties. [1, 4]