The Effect of Fluorescent Labels on Protein Sorption in Polymer Hydrogels
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- 作者：Allan Guan (1) (2)
Zhenyu Li (1)
K. Scott Phillips (2) - 关键词：Hydrogel ; Fluorophore ; Fluorescent label ; Sorption ; Biofouling ; Protein ; Labeling ; Interference ; Contact lens ; Medical device ; Adsorption ; Absorption ; Fluorescence ; Fluorescence recovery after photobleaching (FRAP) ; Photobleaching ; Intrinsic fluorescence ; UV fluorescence ; Residues ; Microplate ; Structure ; Lysozyme ; Ionic ; Hydrohobic ; BCA assay ; Calibration ; Response ; Transparent ; (Hydroxyethyl) methacrylate (HEMA) ; Silicone ; Bicinchoninic acid ; Polymer
- 刊名：Journal of Fluorescence
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：24
- 期：6
- 页码：1639-1650
- 全文大小：2,919 KB
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Zhenyu Li (1)
K. Scott Phillips (2)
1. Department of Biomedical Engineering, The George Washington University, Phillips Hall - Room 617, The Academic Center 801 22nd Street NW, Washington, DC, 20052, USA
2. Office of Medical Products and Tobacco, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Division of Chemistry and Materials Science, United States Food and Drug Administration, 10903 New Hampshire Ave, Silver Spring, MD, 20993, USA - ISSN：1573-4994
文摘
Hydrogels are an increasingly important class of medical device materials that enable diverse and unique function, but can also be subject to significant biofouling and contamination. Although it is challenging to accurately quantify protein biofouling in hydrogels, spectroscopic detection of fluorescently labeled proteins is one method with the potential to provide direct, sensitive quantitation in transparent materials. Therefore, it is important to understand how fluorophores can affect protein-material interactions in hydrogels. This work uses an independent method, native ultraviolet fluorescence (native UV) of proteins, in conjunction with labeled protein fluorescence and the bicinchoninic acid assay (BCA), to assess the effect of fluorescent labels on protein sorption in polymer hydrogels. Bovine serum albumin (BSA) and lysozyme (LY) were labeled with two common but structurally different fluorophores and used as model biofouling proteins in three contact lens hydrogel materials. Native UV was used to directly measure both labeled and unlabeled protein sorption, while orthogonal measurements were performed with extrinsic fluorescence and BCA assay to compare with the native UV results. Sorption of labeled proteins was found to be FRAP) also showed that the fluorescent label chemistry can significantly affect surface adsorption of sorbed proteins on the internal surfaces of hydrogels. This study reveals the complex nature of fluorophore-protein-material interactions and shows the potential of native UV for investigating unlabeled protein biofouling in hydrogels.