. 2021 Nov 6;414(3):1313–1322. doi: 10.1007/s00216-021-03752-3

Table 1.

The interference studies for the detection of the SARS-CoV-2 spike antibody using BSA/S-gene/CysOH/Au/GCE. Conditions: 1 fg/mL of the SARS-CoV-2 spike antibody, 0.01 M (pH 7.5) of PBS solution

Interference	Tolerable amount^a (unit/mL)	Tolerable ratio^b
α-amylase	200	-
Lipase	30	-
Na⁺, K⁺, Mg²⁺	-	750
Ca²⁺	-	600
H₂PO₄⁻, HPO₄²⁻, HCO₃⁻	-	350
Urea, ammonia	-	250

^aTolerable amount is the enzyme concentration directly in the assay medium. ^bTolerable ratio is how many times more than 1 fg/mL (SARS-CoV-2 spike antibody) of the interference does not change the peak height by more than 5%