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Poly(glycidyl methacrylate-co-2-hydroxyethyl methacrylate) Brushes as Peptide/Protein Microarray Substrate for
Zhen Lei1,2, Jiaxue Gao1,2, Xia Liu1
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China.
ACS Applied Materials & Interfaces
|April 7, 2016
Summary
A novel 3D polymer brush substrate enhances protein and peptide microarray performance. This advanced material offers higher immobilization capacity and sensitivity for antibody detection and enzyme activity assays.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Analytical Chemistry
Background:
- Protein and peptide microarrays are crucial tools in diagnostics and drug discovery.
- Existing 2D planar substrates have limitations in immobilization capacity and sensitivity.
- Development of advanced substrates is needed to improve microarray performance.
Purpose of the Study:
- To develop and characterize a novel three-dimensional (3D) polymer-brush substrate for enhanced protein and peptide microarray fabrication.
- To compare the performance of the 3D polymer-brush substrate with traditional 2D planar substrates.
- To demonstrate the utility of the 3D substrate for sensitive detection of antibodies and enzyme activities.
Main Methods:
- Fabrication of a 3D polymer-brush substrate using surface-initiated atom transfer radical polymerization (SI-ATRP) of glycidyl methacrylate (GMA) and 2-hydroxyethyl methacrylate (HEMA) on glass slides.
- Assessment of protein immobilization capacity using human IgG and rabbit antihuman IgG antibodies.
- Evaluation of peptide immobilization and matrix metalloproteinase (MMP) activity determination.
- Comparison with 2D planar epoxy slides for antibody detection sensitivity and MMP activity detection limits.
Main Results:
- The poly(GMA-HEMA) (P(GMA-HEMA)) brush substrate demonstrated significantly higher immobilization capacities for proteins and peptides compared to 2D planar epoxy slides.
- The 3D brush-based microarray exhibited substantially higher sensitivity for rabbit antihuman IgG antibody detection.
- Specific and sensitive determination of MMP-2 and MMP-9 activities was achieved with low detection limits (6.0 pg mL(-1) for MMP-2, 5.7 pg mL(-1) for MMP-9).
- The P(GMA-HEMA) substrate facilitated successful evaluation of cell-secreted MMPs, both off-chip and on-chip.
Conclusions:
- The developed 3D polymer-brush substrate offers superior performance for protein and peptide microarrays.
- This novel substrate enhances immobilization capacity and detection sensitivity, outperforming traditional 2D slides.
- The P(GMA-HEMA) brush substrate is a promising platform for sensitive biomarker detection and cell-based assays.
