title: Study on the resonance Rayleigh scattering and resonance non-linear scattering spectra of ion-association complexes of [PdI4](2-)-protein systems and their analytical applications.
abstract: In an acid medium solution, proteins such as bovine serum albumin, human serum albumin, ovalbumin, hemoglobin, lysozyme, gamma-globulin, alpha-chymotrypsin and papain could react with [PdI(4)](2-) by virtue of electrostatic attraction and hydrophobic force to form ion-association complexes. As a result, the resonance Rayleigh scattering (RRS) and resonance nonlinear scattering such as second-order scattering (SOS) and frequency doubling scattering (FDS) intensities were enhanced greatly and new scattering spectra appeared. The maximum scattering peaks of RRS, SOS and FDS were at 367, 720 and 370 nm, respectively. The enhanced RRS, SOS and FDS intensities were directly proportional to the concentrations of proteins. The detection limits for the different proteins were 2.4-11.8 ng/mL for RRS method, 9.5-47.9 ng/mL for SOS method and 4.6-18.5 ng/mL for FDS method. In this work, the influences of the interaction of [PdI(4)](2-) with proteins on spectral characteristics of RRS, SOS and FDS were investigated and the optimum conditions were tested. Meanwhile, the effects of coexisting substances were tested and the results showed that the method exhibited a good selectivity. Based on the above research, a highly sensitive, simple and rapid method for the determination of trace amounts of proteins by resonance light scattering technique has been developed. It can be applied to the determination of proteins in tablet, human serum and urine samples.
authors.affiliation: School of Chemistry and Chemical Engineering, Southwest China University, Key Laboratory on Luminescence and Real-Time Analysis (Southwest University), Ministry of Education, Chongqing 400715, China.
authors.forename: Jia-Gang
authors.initials: JG
authors.lastname: Luo
authors.forename: Zhong-Fang
authors.initials: ZF
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Kong
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Hu
authors.forename: Shao-Pu
authors.initials: SP
authors.lastname: Liu
mesh_terms: D000419:Albuminuria / Q000097:blood / Q000652:urine; D000818:Animals; D002417:Cattle; D006801:Humans; D007454:Iodides / Q000737:chemistry*; D007477:Ions; D057230:Limit of Detection; D046911:Macromolecular Substances / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D011507:Proteinuria / Q000097:blood / Q000652:urine; D012542:Scattering, Radiation; D012709:Serum Albumin / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry* / Q000652:urine; D055672:Static Electricity; D013607:Tablets / Q000737:chemistry; D013997:Time Factors
chemical_list: D007454:Iodides; D007477:Ions; D046911:Macromolecular Substances; D012709:Serum Albumin; D013607:Tablets; D012710:Serum Albumin, Bovine; D010165:Palladium