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  • Title: Poly(dimethyl siloxane)-based protein chip for simultaneous detection of multiple samples: use of glycidyl methacrylate photopolymer for site-specific protein immobilization.
    Author: Park KH, Park HG, Kim JH, Seong KH.
    Journal: Biosens Bioelectron; 2006 Dec 15; 22(5):613-20. PubMed ID: 16546371.
    Abstract:
    This paper describes fabrication of a poly(dimethyl siloxane) (PDMS)-based chip to analyze multiple protein interactions utilizing glycidyl methacrylate (GMA) photopolymer for a site-specific immobilization of capture proteins in a closed system. First, using one direction channels of a PDMS mold having cross-channels, GMA micropads were prepared by photopolymerizing GMA solution by 365 nm light irradiation at predetermined positions. After the first mold was replaced with a second mold having higher height or directly without mold changing, capture proteins were allowed to be covalently immobilized onto the surface of the epoxide-activated GMA pads. Following immobilization, poly(ethylene glycol) diacrylate (PEG-DA) precursor was photopolymerized at specific regions to generate plugs for prevention of mixing between different sample injection channels, diminishing the need of a mold changing for sample injections. Final chip was assembled by connecting separated sample injection channels using a connector mold. The viability of this strategy was successfully demonstrated by simultaneous detection of two different antigen-antibody interactions.
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