A centrifugal fluidic immunoassay for ocular diagnostics with an enzymatically hydrolyzed fluorogenic substrate.

Journal Article (Journal Article)

We present a novel "Lab-on-a-Disk" platform and demonstrate its capability for rapid and sensitive measurement of vascular endothelial growth factor (VEGF) intended for patients suffering from diabetic retinopathy (DR) and age-related macular degeneration (AMD). This approach combines sedimentation principles applied to microspheres under centrifugal force with signal amplification using an enzyme and a fluorogenic substrate for readout. The simple single channel per assay platform separates, washes and concentrates antibody-coated microspheres from excess label to produce a sensitive fluorogenic response proportional to the amount of VEGF in the sample. This platform has comparable sensitivity to conventional ELISA and can generate a readout within 16-18 min with no sample preparation beyond mixing assay reagents and loading on the disk. In the context of ocular diagnostics, this device has the potential to facilitate accurate dosing of anti-VEGF medications utilized to treat DR and AMD, as well as identify patients whose ocular VEGF levels are not elevated and who would therefore not benefit from standard anti-VEGF medications.

Full Text

Duke Authors

Cited Authors

  • Walsh, DI; Sommer, GJ; Schaff, UY; Hahn, PS; Jaffe, GJ; Murthy, SK

Published Date

  • August 7, 2014

Published In

Volume / Issue

  • 14 / 15

Start / End Page

  • 2673 - 2680

PubMed ID

  • 24806296

Electronic International Standard Serial Number (EISSN)

  • 1473-0189

Digital Object Identifier (DOI)

  • 10.1039/c4lc00279b


  • eng

Conference Location

  • England