Immobilized replicates of sequence 136–148 of human serum albumin as adsorbents for bilirubin

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Abstract
Strategic peptide sequences, patterned on the sequence 136–148 of the primary structure of human serum albumin, have been immobilized on a cross-linked polyacrylamide support using the solid phase peptide synthesis technique. Certain of the resulting materials proved to be efficient adsorbents for bilirubin from aqueous phosphate buffer solution. Amino acids such as lysine and arginine favour the binding of the ligand, whereas glutamic acid reduces it markedly. From Scatchard plots, first and second equilibrium binding constants, in the range of (0.3–9.6) × 104 M−1, were obtained using a site treatment. These binding constants are comparable to that for the binding of bilirubin by a larger fragment of bovine serum albumin that contains the synthesized sequence.