Determination of collagen type IV by Surface Plasmon Resonance Imaging using a specific biosensor |
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Authors: | A Sankiewicz Z Lukaszewski K Trojanowska E Gorodkiewicz |
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Institution: | 1. Department of Electrochemistry, Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245, Bialystok, Poland;2. Faculty of Chemical Technology, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965, Poznan, Poland |
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Abstract: | Serum collagen type IV (COLIV) is a promising tumor marker. High COLIV concentrations have been found in the serum of patients with colorectal, gastric, lung, liver and breast cancers. The aim of this work was to develop a biosensor for use with the Surface Plasmon Resonance Imaging (SPRI) technique for COLIV determination. The biosensor consists of glass covered with gold and immobilized monoclonal mouse anti-human collagen type IV antibody via cysteamine linker. The biosensor works selectively within a dynamic response range between 10 and 300 ng mL−1, with LOD 2.4 ng mL−1 and LOQ 8 ng mL−1. The precision of determination is 4.7% at a 150 ng mL−1 COLIV spike and 8.0% at a 20 ng mL−1 spike, with recoveries of 101% and 106% respectively. A 100-fold excess of collagen I, albumin, laminin and fibronectin is tolerated. The average COLIV blood plasma concentration of healthy donors determined by the developed method was 69 ± 10 ng mL−1, while the median of six results available in the literature was approximately 80 ng mL−1. The average COLIV blood plasma concentration of breast cancer patients was 360 ± 68 ng mL−1, showing the high potential of COLIV as a marker of this type of cancer. |
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Keywords: | Biosensor Surface Plasmon Resonance Imaging Collagen IV |
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