| CNT-COOH | Carbon nanotubes functionalised with carboxylic acid groups |
| CNTs | Carbon nanotubes |
| LOx | Lactate oxidase |
| GOx | Glucose oxidas |
| CAT | Catalase |
| LGOx | L-Glutamate oxidase |
| TYR | Tyrosinase |
| Lac | L-Lactate |
| ATP | 4-Aminothiophenol |
| CDI | 1,1′-Carbonyldiimidazole |
| DMF | Dimethylformamide |
| DIPEA | N,N-Diisopropylethylamine |
| PPB | Potassium phosphate buffer |
| AuNp | Gold nanoparticles |
| CV | Cyclic voltamperometry |
| CA | Chronoamperometry |
| Au | Gold electrode |
| SAM | Self-assembly monolayer |
| S | Slope derived from the linear concentration range |
| LOD | Limit of detection |
| AFM | Atomic force microscopy |
| RSD | Relative standard deviation |
| GABA | γ-Aminobutyric acid |
| TRIS | Tris(hydroxymethyl)aminomethane |
| FAD | Flavin adenine dinucleotide |