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All Outputs (72)

Water-Based 3D Inkjet Printing of an Oral Pharmaceutical Dosage Form (2019)
Journal Article
Cader, H. K., Rance, G. A., Alexander, M. R., Gonçalves, A. D., Roberts, C. J., Tuck, C. J., & Wildman, R. D. (2019). Water-Based 3D Inkjet Printing of an Oral Pharmaceutical Dosage Form. International Journal of Pharmaceutics, 564, 359-368. https://doi.org/10.1016/j.ijpharm.2019.04.026

Inkjet printing is a form of additive manufacturing where liquid droplets are selectively deposited onto a substrate followed by solidification. The process provides significant potential advantages for producing solid oral dosage forms or tablets, i... Read More about Water-Based 3D Inkjet Printing of an Oral Pharmaceutical Dosage Form.

Lipids and polymers in pharmaceutical technology: lifelong companions (2019)
Journal Article
Siepmann, J., Faham, A., Clas, S.-D., Boyd, B. J., Jannin, V., Bernkop-Schnürch, A., …Leroux, J.-C. (2019). Lipids and polymers in pharmaceutical technology: lifelong companions. International Journal of Pharmaceutics, 558, 128-142. https://doi.org/10.1016/j.ijpharm.2018.12.080

In pharmaceutical technology, lipids and polymers are considered pillar excipients for the fabrication of most dosage forms, irrespective of the administration route. They play various roles ranging from support vehicles to release rate modifiers, st... Read More about Lipids and polymers in pharmaceutical technology: lifelong companions.

Improved extraction repeatability and spectral reproducibility for liquid extraction surface analysis–mass spectrometry using superhydrophobic–superhydrophilic patterning (2018)
Journal Article
Meurs, J., Alexander, M. R., Levkin, P. A., Widmaier, S., Bunch, J., Barrett, D. A., & Kim, D.-H. (in press). Improved extraction repeatability and spectral reproducibility for liquid extraction surface analysis–mass spectrometry using superhydrophobic–superhydrophilic patterning. Analytical Chemistry, 90(10), https://doi.org/10.1021/acs.analchem.8b00973

A major problem limiting reproducible use of liquid extraction surface analysis (LESA) array sampling of dried surface-deposited liquid samples is the unwanted spread of extraction solvent beyond the dried sample limits, resulting in unreliable data.... Read More about Improved extraction repeatability and spectral reproducibility for liquid extraction surface analysis–mass spectrometry using superhydrophobic–superhydrophilic patterning.

Synthetic light-curable polymeric materials provide a supportive niche for dental pulp stem cells (2017)
Journal Article
Vining, K. H., Scherba, J. C., Bever, A., Alexander, M. R., Celiz, A. D., & Mooney, D. J. (2018). Synthetic light-curable polymeric materials provide a supportive niche for dental pulp stem cells. Advanced Materials, 30(4), Article 1704486. https://doi.org/10.1002/adma.201704486

Dental disease annually affects billions of patients, and while regenerative dentistry aims to heal dental tissue after injury, existing polymeric restorative materials, or fillings, do not directly participate in the healing process in a bioinstruct... Read More about Synthetic light-curable polymeric materials provide a supportive niche for dental pulp stem cells.

The 3D OrbiSIMS—label-free metabolic imaging with subcellular lateral resolution and high mass-resolving power (2017)
Journal Article
Passarelli, M. K., Pirkl, A., Moellers, R., Grinfeld, D., Kollmer, F., Havelund, R., …Gilmore, I. S. (2017). The 3D OrbiSIMS—label-free metabolic imaging with subcellular lateral resolution and high mass-resolving power. Nature Methods, 14(12), 1175-1183. https://doi.org/10.1038/nmeth.4504

© 2017 Nature America, Inc., part of Springer Nature. All rights reserved. We report the development of a 3D OrbiSIMS instrument for label-free biomedical imaging. It combines the high spatial resolution of secondary ion mass spectrometry (SIMS; unde... Read More about The 3D OrbiSIMS—label-free metabolic imaging with subcellular lateral resolution and high mass-resolving power.

Intracellular drug uptake: a comparison of single cell measurements using ToF-SIMS imaging and quantification from cell populations with LC/MS/MS (2017)
Journal Article
Newman, C. F., Havelund, R., Passarelli, M. K., Marshall, P. S., Francis, I., West, A., …Dollery, C. T. (2017). Intracellular drug uptake: a comparison of single cell measurements using ToF-SIMS imaging and quantification from cell populations with LC/MS/MS. Analytical Chemistry, 89(22), 11944-11953. https://doi.org/10.1021/acs.analchem.7b01436

ToF-SIMS is a label-free imaging method that has been shown to enable imaging of amiodarone in single rat macrophage (NR8383) cells. In this study, we show that the method extends to three other cell lines relevant to drug discovery: human embryonic... Read More about Intracellular drug uptake: a comparison of single cell measurements using ToF-SIMS imaging and quantification from cell populations with LC/MS/MS.

Water contact angle is not a good predictor of biological responses to materials (2017)
Journal Article
Alexander, M. R., & Williams, P. (in press). Water contact angle is not a good predictor of biological responses to materials. Biointerphases, 12(2), Article 02C201. https://doi.org/10.1116/1.4989843

Often the view is expressed that water contact angle (WCA) or other wettability/surface energy measurements made on a material surface can be used to predict cellular attachment to materials, e.g., bacteria attach to hydrophobic surfaces. In this art... Read More about Water contact angle is not a good predictor of biological responses to materials.

Image based machine learning for identification of macrophage subsets (2017)
Journal Article
Rostam, H., Reynolds, P. M., Alexander, M. R., Gadegaard, N., & Ghaemmaghami, A. M. (2017). Image based machine learning for identification of macrophage subsets. Scientific Reports, 7(1), Article 3521. https://doi.org/10.1038/s41598-017-03780-z

Macrophages play a crucial rule in orchestrating immune responses against pathogens and foreign materials. Macrophages have remarkable plasticity in response to environmental cues and are able to acquire a spectrum of activation status, best exemplif... Read More about Image based machine learning for identification of macrophage subsets.

Development and characterization of a stable adhesive bond between a poly(dimethylsiloxane) catheter material and a bacterial biofilm resistant acrylate polymer coating (2017)
Journal Article
Tyler, B. J., Hook, A. L., Pelster, A., Williams, P., Alexander, M. R., & Arlinghaus, H. F. (2017). Development and characterization of a stable adhesive bond between a poly(dimethylsiloxane) catheter material and a bacterial biofilm resistant acrylate polymer coating. Biointerphases, 12(2), Article 02C412. https://doi.org/10.1116/1.4984011

Catheter associated urinary tract infections (CA-UTIs) are the most common health related infections world wide, contributing significantly to patient morbidity and mortality and increased health care costs. To reduce the incidence of these infection... Read More about Development and characterization of a stable adhesive bond between a poly(dimethylsiloxane) catheter material and a bacterial biofilm resistant acrylate polymer coating.

Making Silicone Rubber Highly Resistant to Bacterial Attachment Using Thiol-ene Grafting (2016)
Journal Article
Magennis, E. P., Hook, A. L., Williams, P., & Alexander, M. R. (2016). Making Silicone Rubber Highly Resistant to Bacterial Attachment Using Thiol-ene Grafting. ACS Applied Materials and Interfaces, 8(45), 30780-30787. https://doi.org/10.1021/acsami.6b10986

Biomedical devices are indispensable in modern medicine yet offer surfaces that promote bacterial attachment and biofilm formation, resulting in acute and chronic healthcare-associated infections. We have developed a simple method to graft acrylates... Read More about Making Silicone Rubber Highly Resistant to Bacterial Attachment Using Thiol-ene Grafting.

The impact of surface chemistry modification on macrophage polarisation (2016)
Journal Article
Rostam, H., Singh, S., Salazar, F., Magennis, P., Hook, A. L., Singh, T., …Ghaemmaghami, A. M. (2016). The impact of surface chemistry modification on macrophage polarisation. Immunobiology, 221(11), 1237-1246. https://doi.org/10.1016/j.imbio.2016.06.010

Macrophages are innate immune cells that have a central role in combating infection and maintaining tissue homeostasis. They exhibit remarkable plasticity in response to environmental cues. At either end of a broad activation spectrum are pro-inflamm... Read More about The impact of surface chemistry modification on macrophage polarisation.

The influence of nanotexturing of poly(lactic-co-glycolic acid) films upon human ovarian cancer cell attachment (2016)
Journal Article
Yaşayan, G., Xue, X., Collier, P., Clarke, P., Alexander, M. R., & Marlow, M. (2016). The influence of nanotexturing of poly(lactic-co-glycolic acid) films upon human ovarian cancer cell attachment. Nanotechnology, 27(25), https://doi.org/10.1088/0957-4484/27/25/255102

In this study, we have produced nanotextured poly(lactic-co-glycolic acid) (PLGA) films by using polystyrene (PS) particles as a template to make a polydimethylsiloxane mould against which PLGA is solvent cast. Biocompatible, biodegradable and nanote... Read More about The influence of nanotexturing of poly(lactic-co-glycolic acid) films upon human ovarian cancer cell attachment.

Imaging of Crystalline and Amorphous Surface Regions Using Time-of-Flight Secondary-Ion Mass Spectrometry (ToF-SIMS): Application to Pharmaceutical Materials (2016)
Journal Article
Iuraş, A., Scurr, D. J., Boissier, C., Nicholas, M. L., Roberts, C. J., & Alexander, M. R. (2016). Imaging of Crystalline and Amorphous Surface Regions Using Time-of-Flight Secondary-Ion Mass Spectrometry (ToF-SIMS): Application to Pharmaceutical Materials. Analytical Chemistry, 88(7), 3481-3487. https://doi.org/10.1021/acs.analchem.5b02621

The structure of a material, in particular the extremes of crystalline and amorphous forms, significantly impacts material performance in numerous sectors such as semiconductors, energy storage, and pharmaceutical products, which are investigated in... Read More about Imaging of Crystalline and Amorphous Surface Regions Using Time-of-Flight Secondary-Ion Mass Spectrometry (ToF-SIMS): Application to Pharmaceutical Materials.

3D chemical characterization of frozen hydrated hydrogels using ToF-SIMS with argon cluster sputter depth profiling (2015)
Journal Article
Taylor, M., Scurr, D., Lutolf, M., Buttery, L. D., Zelzer, M., & Alexander, M. R. (2015). 3D chemical characterization of frozen hydrated hydrogels using ToF-SIMS with argon cluster sputter depth profiling. Biointerphases, 11(2), Article 02A301. https://doi.org/10.1116/1.4928209

Hydrogels have been used extensively in bioengineering as artificial cell culture supports. Investigation of the interrelationship between cellular response to the hydrogel and its chemistry ideally requires methods that allow characterization withou... Read More about 3D chemical characterization of frozen hydrated hydrogels using ToF-SIMS with argon cluster sputter depth profiling.

Authentication of processed meat products by peptidomic analysis using rapid ambient mass spectrometry (2015)
Journal Article
Montowska, M., Alexander, M. R., Tucker, G. A., & Barrett, D. A. (2015). Authentication of processed meat products by peptidomic analysis using rapid ambient mass spectrometry. Food Chemistry, 187, https://doi.org/10.1016/j.foodchem.2015.04.078

We present the application of a novel ambient LESA-MS method for the authentication of processed meat products. A set of 25 species and protein-specific heat stable peptide markers has been detected in processed samples manufactured from beef, pork,... Read More about Authentication of processed meat products by peptidomic analysis using rapid ambient mass spectrometry.

Multivariate ToF-SIMS image analysis of polymer microarrays and protein adsorption (2015)
Journal Article
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

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 sa... Read More about Multivariate ToF-SIMS image analysis of polymer microarrays and protein adsorption.

3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling (2015)
Journal Article
Bailey, J., Havelund, R., Shard, A. G., Gilmore, I. S., Alexander, M. R., Sharp, J. S., & Scurr, D. J. (2015). 3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling. ACS Applied Materials and Interfaces, 7(4), 2654-2659. https://doi.org/10.1021/am507663v

ToF-SIMS imaging with argon cluster sputter depth profiling has provided detailed insight into the three-dimensional (3D) chemical composition of a series of polymer multilayer structures. Depths of more than 15 μm were profiled in these samples whil... Read More about 3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling.

Impact of surface chemistry and topography on the function of antigen presenting cells (2015)
Journal Article
Rostam, H. M., Singh, S., Vrana, N. E., Alexander, M. R., & Ghaemmaghami, A. M. (2015). Impact of surface chemistry and topography on the function of antigen presenting cells. Biomaterials Science, 3(3), 424-441. https://doi.org/10.1039/c4bm00375f

Antigen presenting cells (APCs) such as macrophages and dendritic cells (DCs) play a crucial role in orchestrating immune responses against foreign materials. The activation status of APCs can determine the outcome of an immune response following imp... Read More about Impact of surface chemistry and topography on the function of antigen presenting cells.