title: A solid phase adsorption method for preparation of bovine serum albumin-bovine hemoglobin conjugate.
abstract: A solid phase adsorption method was proposed to prepare well-defined bovine serum albumin-bovine hemoglobin (Hb) conjugate. After adsorption by the solid phase, Q Sepharose Fast Flow media, bovine serum albumin (BSA) molecules were allowed to react with glutaraldehyde. The spacing out of BSA molecules on the solid phase was assumed to limit polymerization of BSA molecules, except some molecules bound closely on the solid phase resulting in minor dimer formation. Following the elution procedure, the activated monomeric BSA was separated from the dimers by gel filtration chromatography on Superdex 200 and then reacted with bovine Hb at 4 degrees C and pH 9.5. The 1:1 (BSA:Hb) conjugate was obtained with the yield of 64%. The P(50) values of the conjugates, prepared under anaerobic and aerobic conditions, were 19.1 and 14.2 mmHg, respectively. The dependence of the P(50) on chloride ions for the conjugate was slightly diminished, presumably due to covalent attachment of BSA to bovine Hb.
authors.affiliation: National Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Su
mesh_terms: D000327:Adsorption; D001802:Blood Substitutes / Q000138:chemical synthesis / Q000302:isolation & purification; D002713:Chlorine / Q000737:chemistry; D002847:Chromatography, Agarose / Q000379:methods*; D005976:Glutaral / Q000737:chemistry*; D006454:Hemoglobins / Q000138:chemical synthesis* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D046911:Macromolecular Substances; D010100:Oxygen / Q000737:chemistry; D011485:Protein Binding; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012685:Sepharose / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000138:chemical synthesis* / Q000302:isolation & purification
chemical_list: D001802:Blood Substitutes; D006454:Hemoglobins; D046911:Macromolecular Substances; C097574:sepharose fast flow SP; D012710:Serum Albumin, Bovine; D002713:Chlorine; D012685:Sepharose; D010100:Oxygen; D005976:Glutaral