Table 1.

Comparison of the nanocatalysis and the inhibition of HP on the reaction of TCA–HAuCl₄

System	Linear range	Linear equation	Correlation coefficient
GONR	1.0–30 ng/mL GONR	ΔI545 nm =61.5C+203	0.9918
AuNP (d =10 nm)	1.0–25 ng/mL AuNP	ΔI545 nm =58.3C+150	0.9834
HP–GONR	2.0–30 nmoL/L HP	ΔI545 nm =47.8C+69.5	0.9804
GO	2.0–30 ng/mL GO	ΔI545 nm =36.9C−89.8	0.9621

Note: I is measured in au.

Abbreviations: HP, hCG polypeptide; TCA, trisodium citrate; GONR, graphene oxide nanoribbon; AuNP, gold nanoparticle; GO, graphene oxide; hCG, human chorionic gonadotropin; I, intensity; C, concentration; d, diameter.