Home › Biochemistry › Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α
Biochemistry JoVE (Open Access) Citable · DOI

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α

DOI: 10.3791/57421-v
What you'll learn
  • ✓ Prepare and activate paramagnetic beads for antibody conjugation
  • ✓ Optimize single molecule array digital ELISA assay parameters
  • ✓ Validate ultrasensitive IFN-α detection in human samples
  • ✓ Interpret and apply optimized assay results
Protocol

Here we present a protocol to describe the development and validation of a single molecule array digital ELISA assay, which enables the ultra-sensitive detection of all IFN-α subtypes in human samples.

Difficulty
advanced
Total time
~3-4 days (bead preparation ~1 day, assay optimization ~2 days, validation ~1 day)
Biosafety
BSL-1

Steps

1
Prepare, activate, and conjugate antibodies to beads

Prepare paramagnetic beads, activate their surface, and conjugate capture antibodies to enable subsequent antigen binding in the digital ELISA assay.

▶ 01:03
2
Block beads and perform final cleanup

Block non-specific binding sites on antibody-conjugated beads and conduct final purification steps to remove unbound reagents.

▶ 03:26
3
Optimize assay parameters and validation conditions

Systematically optimize assay conditions including detection antibody concentration, incubation times, and wash protocols to maximize sensitivity and specificity for IFN-α.

▶ 04:50
4
Apply and validate optimized IFN-α assay

Demonstrate the application of the optimized single molecule array digital ELISA to detect all IFN-α subtypes in human test samples with ultrasensitive results.

▶ 07:06
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