Bienzymatic Acetylcholinesterase and Choline Oxidase Immobilized Biosensor Based on a Phenyl Carboxylic Acid-Grafted Multiwalled Carbon Nanotube

Table 1

Results of the ACh level in human blood sample using AChE-ChOx-modified biosensor based on GCE and SPE^a.

Sex (20 years old)	ACh level (GCE) (𝜇M)	ACh level (SPE) (𝜇M)
Male	57.0	40.2
Female	68.5	52.1

aThe sample is prepared by adding human blood (3.3 × 10⁻² mg) in 0.1 M PBS with 1.0 mM K₃Fe(CN)₆/K₄Fe(CN)₆ (10 mL).