Method for manufacturing working electrode for biosensor including metal nanoparticles, electrode manufactured thereby, and method for measuring concentration of biomarkers in sample using manufactured electrode
A method for manufacturing a working electrode for a biosensor is proposed. The method may include providing an Indium Tin Oxide (ITO) glass electrode. The method may also include immobilizing a fixing material on the surface of the ITO glass electrode, wherein the fixing material comprises a first compound and a second compound, and wherein the second compound is a linker compound-metal nanoparticle conjugate. The method may further include immobilizing a reaction factor on the fixing material. An electrode manufactured by the method, and a method for measuring the concentration of biomarkers in a sample using a biosensor including the working electrode are also proposed.
1 . A method of manufacturing a working electrode for a biosensor, comprising:
providing an ITO (indium tin oxide) glass electrode;
immobilizing a fixing material on a surface of the ITO glass electrode, wherein the fixing material comprises a first compound and a second compound, and wherein the second compound is a conjugate of a linker compound and metal nanoparticles; and
immobilizing a response factor to the fixing material,
wherein an amount of the metal nanoparticles in the fixing material is 1.20×10 −3 A 520 units to 6.5×10 −3 A 520 units.
2 . The method according to claim 1 , wherein the first compound and the linker compound are compounds of same kind.
3 . The method according to claim 1 , wherein the first compound and the linker compound are avidin.
4 . The method according to claim 3 , wherein the avidin is natural avidin, streptavidin, or any combination thereof.
5 . The method according to claim 1 , wherein the metal nanoparticles are gold nanoparticles.
6 . The method according to claim 1 , wherein the response factor is a response factor conjugated with a third compound, and wherein the third compound binds to the first compound when the response factor is immobilized to the fixing material.
7 . The method according to claim 6 , wherein the third compound is biotin.
8 . A working electrode for a biosensor manufactured by the method according to claim 1 .
9 . A method of measuring a concentration of a biomarker in a sample using a biosensor, comprising:
immersing the working electrode of claim 8 in the sample; and
measuring an electrical signal in response to a redox reaction by treating the immersed working electrode with an electrical redox enzyme, immersing the treated working electrode in a solution comprising an electrical redox substrate, and applying a redox voltage.
10 . The method according to claim 9 , wherein the electrical redox enzyme is any one enzyme selected from the group consisting of HRP (horseradish peroxidase), ALP (alkaline phosphatase), glucose oxidase, luciferase, beta-D-galactosidase (β-malate dehydrogenase (MDH)), and acetylcholinesterase.
11 . The method according to claim 9 , wherein measuring the electrical signal is performed using cyclic voltammetry (CV), and the electrical signal is a maximum current value measured through cyclic voltammetry.