title: Binding constant measurement by hyper-Rayleigh scattering: bilirubin-human serum albumin binding as a case study.
abstract: In this paper, a new application of the hyper-Rayleigh scattering technique in determining multiple binding constants of a small molecule like bilirubin to a macromolecule like the protein human serum albumin has been demonstrated. Human serum albumin has two binding sites for bilirubin, and the binding constants have been measured by carrying out a second harmonic titration of the protein against bilirubin and vice versa. The measured binding constants K(1) = 1.5 +/- 0.43 x 10(7) M(-1) and K(2) = 1.01 +/- 0.16 x 10(6) M(-1) agree well with the reported values obtained by other methods.
authors.affiliation: Department of Inorganic and Physical Chemistry, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: Arumugam
authors.initials: A
authors.lastname: Sri Ranjini
authors.forename: Puspendu K
authors.initials: PK
authors.lastname: Das
authors.forename: Padmanabhan
authors.initials: P
authors.lastname: Balaram
mesh_terms: D000818:Animals; D001663:Bilirubin / Q000737:chemistry*; D002417:Cattle; D006801:Humans; D008433:Mathematics; D011485:Protein Binding; D012709:Serum Albumin / Q000737:chemistry*
chemical_list: D012709:Serum Albumin; D001663:Bilirubin