title: Resonance light-scattering spectrometric study of interaction between enzyme and MPA-modified CdTe nanoparticles.
abstract: This paper described a novel assay of enzyme based on the measurement of enhanced resonance light-scattering (RLS) signals resulting from the electrostatic and coordination interaction of functionalized CdTe nanoparticles with enzyme. The CdTe nanoparticles which were modified with 3-mercaptocarboxylic acid (MPA) have abundant carboxylic groups (COOH). So the nanoparticles are water-soluble, stable and biocompatible. At pH 8.3 phosphate buffered saline (PBS), the RLS signals of functionalized nano-CdTe are greatly enhanced by bromelain and papain in the region of 220-800 nm characterized by the peak around 318-314 nm, respectively. The optimization conditions of the reaction were also examined and selected. Under the selected conditions, the enhanced RLS intensity is linearly proportional to the concentration of bromelain and papain. The liner range is (0.09-0.9) x 10(-6)mol/L for bromelain and (0.048-0.702) x 10(-6)mol/L for papain. The influences of some foreign substances were also examined. This method can be applied to the determination of enzyme.
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, PR China.
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.forename: Minjie
authors.initials: M
authors.lastname: Li
authors.forename: Jieli
authors.initials: J
authors.lastname: Tang
authors.forename: Xiaozhou
authors.initials: X
authors.lastname: Li
authors.forename: Hanqi
authors.initials: H
authors.lastname: Zhang
authors.forename: Yihua
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D001963:Bromelains / Q000378:metabolism*; D019187:Cadmium Compounds / Q000378:metabolism*; D002138:Calibration; D002264:Carboxylic Acids / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008027:Light; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010206:Papain / Q000378:metabolism*; D012542:Scattering, Radiation; D013053:Spectrophotometry; D013438:Sulfhydryl Compounds / Q000378:metabolism*; D013691:Tellurium / Q000378:metabolism*; D013997:Time Factors
chemical_list: D019187:Cadmium Compounds; D002264:Carboxylic Acids; D013438:Sulfhydryl Compounds; D001963:Bromelains; D010206:Papain; D013691:Tellurium; C028337:cadmium telluride