title: Electroless-plated gold films for sensitive surface plasmon resonance detection of white spot syndrome virus.
abstract: The paper describes the rapid and label-free detection of the white spot syndrome virus (WSSV) using a surface plasmon resonance (SPR) device based on gold films prepared by electroless plating. The plating condition for obtaining films suitable for SPR measurements was optimized. Gold nanoparticles adsorbed on glass slides were characterized by transmission electron microscopy (TEM). Detection of the WSSV was performed through the binding between WSSV in solution and the anti-WSSV single chain variable fragment (scFv antibody) preimmobilized onto the sensor surface. Morphologies of the as-prepared gold films, gold films modified with self-assembled alkanethiol monolayers, and films covered with antibody were examined using an atomic force microscope (AFM). To demonstrate the viability of the method for real sample analysis, WSSV of different concentrations present in a shrimp hemolymph matrix was determined upon optimizing the surface density of the antibody molecules. The SPR device based on the electroless-plated gold films is capable of detecting concentration of WSSV as low as 2.5 ng/mL in 2% shrimp hemolymph, which is one to two orders of magnitude lower than the level measurable by enzyme-linked immunosorbant assays.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan, PR China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Lei
authors.forename: Hongyu
authors.initials: H
authors.lastname: Chen
authors.forename: Heping
authors.initials: H
authors.lastname: Dai
authors.forename: Zhaorui
authors.initials: Z
authors.lastname: Zeng
authors.forename: Yi
authors.initials: Y
authors.lastname: Lin
authors.forename: Feimeng
authors.initials: F
authors.lastname: Zhou
authors.forename: Daiwen
authors.initials: D
authors.lastname: Pang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004595:Electroplating; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D008567:Membranes, Artificial; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods; D019562:Viral Load / Q000295:instrumentation* / Q000379:methods; D046848:White spot syndrome virus 1 / Q000302:isolation & purification*
chemical_list: D008567:Membranes, Artificial; D006046:Gold