The Effect of Multilayer Gold Nanoparticles on the Electrochemical Response of Ammonium Ion Biosensor Based on Alanine Dehydrogenase Enzyme

Table 1

The comparison between AuNPs-based NH₄⁺ ion biosensor and reported amperometric NH₄⁺ ion biosensors.

Parameters	Present study	Bertocchi et al. [36]	Kwan et al. [37]
Enzyme	AlaDH	GLDH	GLDH and glutamate oxidase
Immobilisation matrix	AuNPs	Nylon net	PCS hydrogel
Linear response range (mM)	0.5–1.3	0.01–0.2	0.01–0.30
Detection limit (mM)	0.01	0.01	0.002
Response time (min)	<1	—	20