title: [Study on the interaction of hemoglobin and Cu(II)-ARS complex].
abstract: The reaction of hemoglobin (Hb) with copper(II)-Alizarin red S (ARS) complex was studied in H3PO4-KH2PO4 buffer solution (pH 4. 2) by ultraviolet-visible spectrophotometry. The results show that the interaction of Hb and Cu(II)-ARS complex produces red ionic association complex with its maximum absorption peak at 537 nm. At the maximum absorption, the composition of the complex was determined to be n(Hb) : n(Cu(II)) : n(ARS) =1 : 4 : 8, and the apparent molar absorptivity was 1.52 x 10(5) L x mol(-1) x cm(-1). The concentration of Hb is linear with the absorbency in the range of 1.0 x 10(-7)-2.0 x 10(-6) mol x L(-1) and the regression equation was established as A = 0.026 9 + 151 675c (mol x L(-1)) with the coefficient r = 0.997 2. The effects of solution acidity, reagent amount, reaction time, temperature, ionic strength and the added surfactant were examined on the formation of the Hb-Cu(II)-ARS complex. A preliminary investigation was carried out to elucidate the reaction mechanism, and it could be concluded that the Hb and Cu(II)-ARS complex are combined mainly by electrostatic attraction. Further investigation was also undertaken to find out the effects of common amino acids and metallic ions on the formation of Hb-Cu(II)-ARS complex.
authors.affiliation: College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China.
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Wu
authors.forename: Ji-Gen
authors.initials: JG
authors.lastname: Miao
authors.forename: Yu-Qing
authors.initials: YQ
authors.lastname: Miao
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Chen
mesh_terms: D000818:Animals; D000880:Anthraquinones / Q000737:chemistry* / Q000378:metabolism; D002417:Cattle; D003300:Copper / Q000737:chemistry* / Q000378:metabolism; D006454:Hemoglobins / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D009942:Organometallic Compounds / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000880:Anthraquinones; D006454:Hemoglobins; D009942:Organometallic Compounds; C004468:Alizarin Red S; D003300:Copper