Multivariate ToF-SIMS image analysis of polymer microarrays and protein adsorption

Hook, Andrew L.; Williams, Philip M.; Alexander, Morgan R.; Scurr, David J.

Abstract

The complexity of hyperspectral time of flight secondary ion mass spectrometry (ToF-SIMS) datasets makes their subsequent analysis and interpretation challenging, and is often an impasse to the identification of trends and differences within large sample-sets. The application of multivariate data analysis has become a routine method to successfully deconvolute and analyze objectively these datasets. The advent of high-resolution large area ToF-SIMS imaging capability has enlarged further the data handling challenges. In this work, a modified multivariate curve resolution image analysis of a polymer microarray containing 70 different poly(meth)acrylate type spots (over a 9.2 × 9.2 mm area) is presented. This analysis distinguished key differences within the polymer library such as the differentiation between acrylate and methacrylate polymers and variance specific to side groups. Partial least squares (PLS) regression analysis was performed to identify correlations between the ToF-SIMS surface chemistry and the protein adsorption. PLS analysis identified a number of chemical moieties correlating with high or low protein adsorption, including ions derived from the polymer backbone and polyethylene glycol side-groups. The retrospective validation of the findings from the PLS analysis was also performed using the secondary ion images for those ions found to significantly contribute to high or low protein adsorption.

Citation

Hook, A. L., Williams, P. M., Alexander, M. R., & Scurr, D. J. (2015). Multivariate ToF-SIMS image analysis of polymer microarrays and protein adsorption. Biointerphases, 10, Article 019005. https://doi.org/10.1116/1.4906484

• Journal Article Type: Article
• Publication Date: Feb 6, 2015
• Deposit Date: Mar 22, 2016
• Publicly Available Date: Mar 22, 2016
• Journal: Biointerphases
• Print ISSN: 1934-8630
• Electronic ISSN: 1559-4106
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Article Number: 019005
• DOI: https://doi.org/10.1116/1.4906484
• Keywords: Least-squares regression; Ion mass spectrometry; Embryonic stem cells; Surfaces; Adhesion; Systems; Growth; Biomaterials; Formulations; Wettability
• Public URL: https://nottingham-repository.worktribe.com/output/745343
• Publisher URL: http://scitation.aip.org/content/avs/journal/bip/10/1/10.1116/1.4906484