Abstract
We developed and characterized a platform based on gold (Au) nanoparticles (NPs) coated with poly(acrylic acid) (PAA) for harvesting positively charged, low molecular weight (LMW) proteins. The particles are synthesized using a layer by layer (LbL) procedure: first the gold NPs are coated with positively charged polyethylenimine (PEI) and subsequently with PAA. This simple procedure produces stable PAA-PEI-Au (PPAu) NPs with high selectivity and specificity. PPAu NPs successfully harvested, separated, and detected various LMW proteins and peptides from serum containing a complex mixture of abundant high molecular weight (HMW) proteins, including bovine serum albumin (BSA) and Immunoglobulin G (IgG). In addition, PPAu NPs selectively harvested and separated LMW proteins from serum in the presence of another positively charged competing protein. Furthermore, PPAu NPs successfully harvested a LMW biomarker in a mock diseased state. This system can be applied in various biomedical applications where selective harvesting and identifying of LMW proteins is required. A particularly useful application for this system can be found in early cancer diagnosis as described hereinafter.
| Original language | English |
|---|---|
| Pages (from-to) | 5750-5759 |
| Number of pages | 10 |
| Journal | ACS Nano |
| Volume | 9 |
| Issue number | 6 |
| DOIs | |
| State | Published - 23 Jun 2015 |
Keywords
- biomarker harvesting
- cancer diagnosis
- gold nanoparticles
- layer by layer
All Science Journal Classification (ASJC) codes
- General Engineering
- General Materials Science
- General Physics and Astronomy
