ImmunoDisk-A Fully Automated Bead-Based Immunoassay Cartridge with All Reagents Pre-Stored.
Biosensors (Basel)
; 12(6)2022 Jun 14.
Article
em En
| MEDLINE
| ID: mdl-35735560
ABSTRACT
In this paper, we present the ImmunoDisk, a fully automated sample-to-answer centrifugal microfluidic cartridge, integrating a heterogeneous, wash-free, magnetic- and fluorescent bead-based immunoassay (bound-free phase detection immunoassay/BFPD-IA). The BFPD-IA allows the implementation of a simple fluidic structure, where the assay incubation, bead separation and detection are performed in the same chamber. The system was characterized using a C-reactive protein (CRP) competitive immunoassay. A parametric investigation on air drying of protein-coupled beads for pre-storage at room temperature is presented. The key parameters were buffer composition, drying temperature and duration. A protocol for drying two different types of protein-coupled beads with the same temperature and duration using different drying buffers is presented. The sample-to-answer workflow was demonstrated measuring CRP in 5 µL of human serum, without prior dilution, utilizing only one incubation step, in 20 min turnaround time, in the clinically relevant concentration range of 15-115 mg/L. A reproducibility assessment over three disk batches revealed an average signal coefficient of variation (CV) of 5.8 ± 1.3%. A CRP certified reference material was used for method verification with a concentration CV of 8.6%. Our results encourage future testing of the CRP-ImmunoDisk in clinical studies and its point-of-care implementation in many diagnostic applications.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Proteína C-Reativa
/
Microfluídica
Tipo de estudo:
Guideline
Limite:
Humans
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article