Bar-coded hydrogel microparticles for protein detection: synthesis, assay and scanning

Nat Protoc. 2011 Oct 20;6(11):1761-74. doi: 10.1038/nprot.2011.400.

Abstract

This protocol describes the core methodology for the fabrication of bar-coded hydrogel microparticles, the capture and labeling of protein targets and the rapid microfluidic scanning of particles for multiplexed detection. Multifunctional hydrogel particles made from poly(ethylene glycol) serve as a sensitive, nonfouling and bio-inert suspension array for the multiplexed measurement of proteins. Each particle type bears a distinctive graphical code consisting of unpolymerized holes in the wafer structure of the microparticle; this code serves to identify the antibody probe covalently incorporated throughout a separate probe region of the particle. The protocol for protein detection can be separated into three steps: (i) synthesis of particles via microfluidic flow lithography at a rate of 16,000 particles per hour; (ii) a 3-4-h assay in which protein targets are captured and labeled within particles using an antibody sandwich technique; and (iii) a flow scanning procedure to detect bar codes and quantify corresponding targets at rates of 25 particles per s. By using the techniques described, single- or multiple-probe particles can be reproducibly synthesized and used in customizable multiplexed panels to measure protein targets over a three-log range and at concentrations as low as 1 pg ml(-1).

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Antibodies, Immobilized / immunology
  • Cattle
  • Electronic Data Processing*
  • Hydrogels*
  • Microscopy
  • Microspheres
  • Proteins / analysis
  • Proteins / chemistry*
  • Serum Albumin, Bovine

Substances

  • Antibodies, Immobilized
  • Hydrogels
  • Proteins
  • Serum Albumin, Bovine