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Home List of Titles Limits of detection for time of flight secondary ion mass spectrometry (ToF-SIMS) and X-ray photoelectron spectroscopy (XPS): detection of low amounts of adsorbed protein
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/58217
- Limits of detection for time of flight secondary ion mass spectrometry (ToF-SIMS) and X-ray photoelectron spectroscopy (XPS): detection of low amounts of adsorbed protein
- Wagner, Matthew S.; McArthur, Sally L.; Shen, Mingchao; Horbett, Thomas A.; Castner, David G.
- Characterization of biomaterial surfaces requires analytical techniques that are capable of detecting a wide concentration range of adsorbed protein. This range includes detection of low amounts of adsorbed protein (<10 ng/cm2) that may be present on non-fouling biomaterials. X-ray Photoelectron Spectroscopy (XPS) and Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) are surface sensitive techniques capable of detecting adsorbed proteins. We have investigated the lower limits of detection of both XPS and ToF-SIMS on four model substrates each presenting unique challenges for analysis by XPS and ToF-SIMS: mica, poly(tetrafluoroethylene), allyl amine plasma polymer and heptyl amine plasma polymer. The detection limit for XPS ranged from 10 ng/cm2 of fibrinogen (on mica) to 200 ng/cm2 (on allyl amine plasma polymers). The detection limit for ToF-SIMS ranged from 0.1 ng/cm2 of fibrinogen to 100 ng/cm2, depending on the substrate and data analysis. Optimal conditions provided detection limits between 0.1 ng/cm2 and 15 ng/cm2 on all of the substrates used in this study. While both techniques were shown to be effective in detecting protein, the sensitivity of both XPS and ToF-SIMS was shown to be dependent on substrate surface chemistry and the organization of the adsorbed protein film. This study specifically highlights the applicability of ToF-SIMS in the characterization of low level protein adsorption.
- Publication type
- Journal article
- Journal of Biomaterials Science: Polymer Edition, Vol. 13, no. 4 (2002), pp. 407-428
- Publication year
- FOR Code(s)
- 0303 Macromolecular and Materials Chemistry
- Adsorption; Biomaterials; Fibrinogen; Limit of detection; Mass spectrometry; Metabolism; Mica; Protein adsorption; Proteins; Sensitivity analysis; Specificity; Spectrum analysis; Surface properties; Time of flight secondary ion mass spectrometry; ToF-SIMS; X ray photoelectron spectroscopy; XPS
- Publisher URL
- Copyright © VSP 2002.
- Additional information
- Funding for this research was provided by the National ESCA and Surface Analysis Center for Biomedical Problems (NESAC/BIO-NIH Grant RR-01296) through the National Center for Research Resources and NHLBI grant HL19419.
- Peer reviewed