A digital enzyme-linked immunosorbent assay for ultrasensitive measurement of amyloid-β 1–42 peptide in human plasma with utility for studies of Alzheimer’s disease therapeutics

Table 4 Summary of average enzymes per bead for prototype assay calibration using Fujirebio standard for assay evaluation and clinical test batches

	AEB
Theoretical concentration, pg/ml	0.023	0.069	0.206	0.617	1.85	5.6	16.7	50.0
Run 6	0.006	0.007	0.008	0.012	0.031	0.164	1.105	8.401
Run 7	0.011	0.012	0.014	0.015	0.036	0.142	1.083	8.115
Run 8	0.011	0.012	0.013	0.013	0.033	0.149	0.931	8.084
N (total number of runs)	3	3	3	3	3	3	3	3
Inter-assay mean	0.009	0.010	0.012	0.013	0.033	0.151	1.040	8.200
SD	0.003	0.003	0.003	0.002	0.002	0.011	0.095	0.175
CV%	28.8	29.1	25.0	13.8	6.6	7.3	9.1	2.1

AEB Average enzyme per bead, CV% Coefficient of variation percentage
In runs 6–8, calibration curves prepared using both Quanterix and Fujirebio standards were included

ISSN: 1758-9193