Enhanced lateral flow immunoassay using gold nanoparticles loaded with enzymes.
The use of gold nanoparticles (AuNPs) as labeling carriers in combination with the enzymatic activity of the horseradish peroxidase (HRP) in order to achieve an improved optical lateral flow immunoassay (LFIA) performance is presented here. Briefly in a LFIA with an immune-sandwich format AuNPs are functionalized with a detection antibody already modified with HRP, obtaining an 'enhanced' label. Two different detection strategies have been tested: the first one following just the red color of the AuNPs and the second one using a substrate for the HRP (3 different substrates are evaluated), which produces a darker color that enhances the intensity of the previous red color of the unmodified AuNPs. In such very simple way it is gaining sensitivity (up to 1 order of magnitude) without losing the simplicity of the LFIA format, opening the way to other LFIA applications including their on-demand performance tuning according to the analytical scenario.
Nanobioelectronics & Biosensors Group, CIN2 (ICN-CSIC), Catalan Institute of Nanotechnology, Campus UAB, Bellaterra (Barcelona), Spain.
Claudio
C
Parolo
Alfredo
A
de la Escosura-Muñiz
Arben
A
Merkoçi
D015374:Biosensing Techniques / Q000295:instrumentation*; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D006735:Horseradish Peroxidase / Q000737:chemistry*; D007118:Immunoassay / Q000295:instrumentation*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D040081:Protein Array Analysis / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D020099:Coated Materials, Biocompatible; D006046:Gold; D006735:Horseradish Peroxidase