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Elkington PT, Dickinson AS, Mavrogordato MN, Spencer DC, Gillams RJ, De Grazia A, Rosini S, Garay-Baquero DJ, Diment LE, Mahobia N, Mant A, Baynham T, Morgan H. A Personal Respirator to Improve Protection for Healthcare Workers Treating COVID-19 (PeRSo). Front Med Technol 2022; 3:664259. [PMID: 35047921 PMCID: PMC8757800 DOI: 10.3389/fmedt.2021.664259] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 05/14/2021] [Indexed: 01/04/2023] Open
Abstract
Introduction: SARS-CoV-2 infection is a global pandemic. Personal Protective Equipment (PPE) to protect healthcare workers has been a recurrent challenge in terms of global stocks, supply logistics and suitability. In some settings, around 20% of healthcare workers treating COVID-19 cases have become infected, which leads to staff absence at peaks of the pandemic, and in some cases mortality. Methods: To address shortcomings in PPE, we developed a simple powered air purifying respirator, made from inexpensive and widely available components. The prototype was designed to minimize manufacturing complexity so that derivative versions could be developed in low resource settings with minor modification. Results: The “Personal Respirator – Southampton” (PeRSo) delivers High-Efficiency Particulate Air (HEPA) filtered air from a battery powered fan-filter assembly into a lightweight hood with a clear visor that can be comfortably worn for several hours. Validation testing demonstrates that the prototype removes microbes, avoids excessive CO2 build-up in normal use, and passes fit test protocols widely used to evaluate standard N95/FFP2 and N99/FFP3 face masks. Feedback from doctors and nurses indicate the PeRSo prototype was preferred to standard FFP2 and FFP3 masks, being more comfortable and reducing the time and risk of recurrently changing PPE. Patients report better communication and reassurance as the entire face is visible. Conclusion: Rapid upscale of production of cheaply produced powered air purifying respirators, designed to achieve regulatory approval in the country of production, could protect healthcare workers from infection and improve healthcare delivery during the COVID-19 pandemic.
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Affiliation(s)
- Paul T Elkington
- School of Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom.,Institute for Life Sciences, University of Southampton, Southampton, United Kingdom.,NIHR Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Alexander S Dickinson
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom.,Mechanical Engineering Department, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Mark N Mavrogordato
- Mechanical Engineering Department, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Daniel C Spencer
- School of Electronics & Computer Science, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Richard J Gillams
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom.,School of Electronics & Computer Science, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Antonio De Grazia
- Mechanical Engineering Department, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Sebastian Rosini
- Mechanical Engineering Department, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Diana J Garay-Baquero
- School of Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom.,NIHR Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Laura E Diment
- Mechanical Engineering Department, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
| | - Nitin Mahobia
- Department of Infection, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Alexandra Mant
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom
| | - Tom Baynham
- INDO Lighting Ltd., Southampton, United Kingdom
| | - Hywel Morgan
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom.,School of Electronics & Computer Science, Faculty of Engineering & Physical Sciences, University of Southampton, Southampton, United Kingdom
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2
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Porges E, Jenner D, Taylor AW, Harrison JS, De Grazia A, Hailes AR, Wright KM, Whelan AO, Norville IH, Prior JL, Mahajan S, Rowland CA, Newman TA, Evans ND. Antibiotic-Loaded Polymersomes for Clearance of Intracellular Burkholderia thailandensis. ACS Nano 2021; 15:19284-19297. [PMID: 34739227 PMCID: PMC7612142 DOI: 10.1021/acsnano.1c05309] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Melioidosis caused by the facultative intracellular pathogen Burkholderia pseudomallei is difficult to treat due to poor intracellular bioavailability of antibiotics and antibiotic resistance. In the absence of novel compounds, polymersome (PM) encapsulation may increase the efficacy of existing antibiotics and reduce antibiotic resistance by promoting targeted, infection-specific intracellular uptake. In this study, we developed PMs composed of widely available poly(ethylene oxide)-polycaprolactone block copolymers and demonstrated their delivery to intracellular B. thailandensis infection using multispectral imaging flow cytometry (IFC) and coherent anti-Stokes Raman scattering microscopy. Antibiotics were tightly sequestered in PMs and did not inhibit the growth of free-living B. thailandensis. However, on uptake of antibiotic-loaded PMs by infected macrophages, IFC demonstrated PM colocalization with intracellular B. thailandensis and a significant inhibition of their growth. We conclude that PMs are a viable approach for the targeted antibiotic treatment of persistent intracellular Burkholderia infection.
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Affiliation(s)
- Eleanor Porges
- Bioengineering Sciences Group, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, SO16 6YD,United Kingdom
- Clinical and Experimental Sciences, Faculty of Medicine, Institute for Life Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Dominic Jenner
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Adam W. Taylor
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
- London School of Hygiene and Tropical Medicine, London, WC1E 7HT, United Kingdom
| | - James S.P. Harrison
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
- School of Chemistry, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Antonio De Grazia
- Bioengineering Sciences Group, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Clinical and Experimental Sciences, Faculty of Medicine, Institute for Life Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
| | - Alethia R. Hailes
- Bioengineering Sciences Group, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, SO16 6YD,United Kingdom
- Clinical and Experimental Sciences, Faculty of Medicine, Institute for Life Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Kimberley M. Wright
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Adam O. Whelan
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Isobel H. Norville
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Joann L. Prior
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Sumeet Mahajan
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
- School of Chemistry, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Caroline A. Rowland
- Defence Science and Technology Laboratory, Chemical, Biological and Radiological Division, Porton Down, Salisbury, SP4 0JQ, United Kingdom
| | - Tracey A. Newman
- Clinical and Experimental Sciences, Faculty of Medicine, Institute for Life Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Nicholas D. Evans
- Bioengineering Sciences Group, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, SO16 6YD,United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom
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Ferri S, Wu Q, De Grazia A, Polydorou A, May JP, Stride E, Evans ND, Carugo D. Tailoring the size of ultrasound responsive lipid-shelled nanodroplets by varying production parameters and environmental conditions. Ultrason Sonochem 2021; 73:105482. [PMID: 33588208 PMCID: PMC7901031 DOI: 10.1016/j.ultsonch.2021.105482] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/08/2021] [Accepted: 01/27/2021] [Indexed: 05/06/2023]
Abstract
Liquid perfluorocarbon nanodroplets (NDs) are an attractive alternative to microbubbles (MBs) for ultrasound-mediated therapeutic and diagnostic applications. ND size and size distribution have a strong influence on their behaviour in vivo, including extravasation efficiency, circulation time, and response to ultrasound stimulation. Thus, it is desirable to identify ways to tailor the ND size and size distribution during manufacturing. In this study phospholipid-coated NDs, comprising a perfluoro-n-pentane (PFP) core stabilised by a DSPC/PEG40s (1,2-distearoyl-sn-glycero-3-phosphocholine and polyoxyethylene(40)stearate, 9:1 molar ratio) shell, were produced in phosphate-buffered saline (PBS) by sonication. The effect of the following production-related parameters on ND size was investigated: PFP concentration, power and duration of sonication, and incorporation of a lipophilic fluorescent dye. ND stability was also assessed at both 4 °C and 37 °C. When a sonication pulse of 6 s and 15% duty cycle was employed, increasing the volumetric concentration of PFP from 5% to 15% v/v in PBS resulted in an increase in ND diameter from 215.8 ± 16.8 nm to 408.9 ± 171.2 nm. An increase in the intensity of sonication from 48 to 72 W (with 10% PFP v/v in PBS) led to a decrease in ND size from 354.6 ± 127.2 nm to 315.0 ± 100.5 nm. Increasing the sonication time from 20 s to 40 s (using a pulsed sonication with 30% duty cycle) did not result in a significant change in ND size (in the range 278-314 nm); however, when it was increased to 60 s, the average ND diameter reduced to 249.7 ± 9.7 nm, which also presented a significantly lower standard deviation compared to the other experimental conditions investigated (i.e., 9.7 nm vs. > 49.4 nm). The addition of the fluorescent dye DiI at different molar ratios did not affect the ND size distribution. NDs were stable at 4 °C for up to 6 days and at 37 °C for up to 110 min; however, some evidence of ND-to-MB phase transition was observed after 40 min at 37 °C. Finally, phase transition of NDs into MBs was demonstrated using a tissue-mimicking flow phantom under therapeutic ultrasound exposure conditions (ultrasound frequency: 0.5 MHz, acoustic pressure: 2-4 MPa, and pulse repetition frequency: 100 Hz).
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Affiliation(s)
- Sara Ferri
- Faculty of Engineering and Physical Sciences, Department of Mechanical Engineering, University of Southampton, UK; Centre for Human Development, Stem Cells and Regeneration, Bioengineering Sciences, Faculty of Medicine, University of Southampton, UK; Institute for Life Sciences (IfLS), University of Southampton, UK
| | - Qiang Wu
- Department of Engineering Science, University of Oxford, UK
| | - Antonio De Grazia
- Faculty of Engineering and Physical Sciences, Department of Mechanical Engineering, University of Southampton, UK
| | - Anastasia Polydorou
- Faculty of Engineering and Physical Sciences, Department of Mechanical Engineering, University of Southampton, UK; Centre for Human Development, Stem Cells and Regeneration, Bioengineering Sciences, Faculty of Medicine, University of Southampton, UK
| | - Jonathan P May
- Faculty of Engineering and Physical Sciences, Department of Mechanical Engineering, University of Southampton, UK; Centre for Human Development, Stem Cells and Regeneration, Bioengineering Sciences, Faculty of Medicine, University of Southampton, UK
| | - Eleanor Stride
- Department of Engineering Science, University of Oxford, UK
| | - Nicholas D Evans
- Faculty of Engineering and Physical Sciences, Department of Mechanical Engineering, University of Southampton, UK; Centre for Human Development, Stem Cells and Regeneration, Bioengineering Sciences, Faculty of Medicine, University of Southampton, UK; Institute for Life Sciences (IfLS), University of Southampton, UK
| | - Dario Carugo
- Department of Pharmaceutics, School of Pharmacy, University College London (UCL), UK.
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4
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Abstract
Urological diseases such as tumours, kidney stones, or strictures in the ureter can lead to a number of health consequences, including life-threatening complications. Ureteral stents have been widely used as a valid solution to restore compromised urological function. Despite their clinical success, stents are subject to failure due to encrustation and biofilm formation, potentially leading to urinary tract infection. The current review focuses on recent advancements in ureteral stent technology, which have been reported in recent scientific journals or patents. Web of Science and Google Scholar have been used as a search engine to perform this review, using the keywords "Ureteral + Stent + Design", "Ureteral + Stent + Material + Coating", "Ureteric + Stent" and "Ureteral + Stent". A significant proportion of technological developments has focused on innovating the stent design to overcome migration and urinary reflux, as well as investigating novel materials and coatings to prevent biofilm formation, such as poly(N,N-dimethylacrylamide) (PDMMA) and swellable polyethylene glycol diacrylate (PEGDA). Biodegradable ureteral stents (BUS) have also emerged as a new generation of endourological devices, overcoming the "forgotten stent syndrome" and reducing healthcare costs. Moreover, efforts have been made to develop pre-clinical test methods, both experimental and computational, which could be employed as a screening platform to inform the design of novel stent technologies.
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Affiliation(s)
- Antonio De Grazia
- Bioengineering Science Research Group, Faculty of Engineering and the Physical Sciences, University of Southampton, Southampton, UK.,Institute for Life Sciences (IfLS), University of Southampton, Southampton, UK
| | - Bhaskar K Somani
- Department of Urology, University Hospital Southampton NHS Trust, Southampton, UK
| | - Federico Soria
- Department of Endoscopy-Endourology, Minimally Invasive Surgery Centre-Jesus Usón, Cáceres, Spain
| | - Dario Carugo
- Bioengineering Science Research Group, Faculty of Engineering and the Physical Sciences, University of Southampton, Southampton, UK.,Institute for Life Sciences (IfLS), University of Southampton, Southampton, UK
| | - Ali Mosayyebi
- Bioengineering Science Research Group, Faculty of Engineering and the Physical Sciences, University of Southampton, Southampton, UK.,Institute for Life Sciences (IfLS), University of Southampton, Southampton, UK
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Scarpa E, Janeczek AA, Hailes A, de Andrés MC, De Grazia A, Oreffo RO, Newman TA, Evans ND. Polymersome nanoparticles for delivery of Wnt-activating small molecules. Nanomedicine 2018; 14:1267-1277. [PMID: 29555223 DOI: 10.1016/j.nano.2018.02.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 02/05/2018] [Accepted: 02/24/2018] [Indexed: 01/02/2023]
Abstract
Spatiotemporal control of drug delivery is important for a number of medical applications and may be achieved using polymersome nanoparticles (PMs). Wnt signalling is a molecular pathway activated in various physiological processes, including bone repair, that requires precise control of activation. Here, we hypothesise that PMs can be stably loaded with a small molecule Wnt agonist, 6-bromoindirubin-3'-oxime (BIO), and activate Wnt signalling promoting the osteogenic differentiation in human primary bone marrow stromal cells (BMSCs). We showed that BIO-PMs induced a 40% increase in Wnt signaling activation in reporter cell lines without cytotoxicity induced by free BIO. BMSCs incubated with BIO-PMs showed a significant up-regulation of the Wnt target gene AXIN2 (14 ± 4 fold increase, P < 0.001) and a prolonged activation of the osteogenic gene RUNX2. We conclude that BIO-PMs could represent an innovative approach for the controlled activation of Wnt signaling for promoting bone regeneration after fracture.
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Affiliation(s)
- Edoardo Scarpa
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom; Institute for Life Sciences, Centre for Biological Sciences, B85, University Road, University of Southampton, Southampton, United Kingdom
| | - Agnieszka A Janeczek
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom
| | - Alethia Hailes
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom; Institute for Life Sciences, Centre for Biological Sciences, B85, University Road, University of Southampton, Southampton, United Kingdom
| | - Maria C de Andrés
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom
| | - Antonio De Grazia
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom
| | - Richard Oc Oreffo
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom; Institute for Life Sciences, Centre for Biological Sciences, B85, University Road, University of Southampton, Southampton, United Kingdom
| | - Tracey A Newman
- Institute for Life Sciences, Centre for Biological Sciences, B85, University Road, University of Southampton, Southampton, United Kingdom; Clinical and Experimental Sciences, Medicine, University of Southampton, Southampton, United Kingdom.
| | - Nicholas D Evans
- Centre for Human Development, Stem Cells and Regeneration, Bone and Joint Research Group, University of Southampton Faculty of Medicine, Southampton, United Kingdom; Institute for Life Sciences, Centre for Biological Sciences, B85, University Road, University of Southampton, Southampton, United Kingdom; Bioengineering Sciences Group, Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton, United Kingdom.
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6
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Sanzari I, Callisti M, Grazia AD, Evans DJ, Polcar T, Prodromakis T. Parylene C topographic micropattern as a template for patterning PDMS and Polyacrylamide hydrogel. Sci Rep 2017; 7:5764. [PMID: 28720761 PMCID: PMC5516021 DOI: 10.1038/s41598-017-05434-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/16/2017] [Indexed: 11/09/2022] Open
Abstract
Parylene C is a well-known polymer and it has been mainly employed as a protective layer for implantable electronics. In this paper, we propose a new approach to use Parylene C as a versatile template for patterning soft materials potentially applicable as scaffolds in cardiac tissue engineering (TE). Parylene C substrates were anisotropically patterned through standard lithographic process with hydrophilic channels separating raised hydrophobic strips. Ridges and grooves of the template are 10 µm width and depth ranging from 1 to 17 µm. Polydimethylsiloxane (PDMS) and Polyacrylamide (PAm) hydrogel have been chosen as soft polymers to be moulded. Thanks to their chemical and physical properties PDMS and PAm hydrogel mimic the extracellular matrix (ECM). PDMS was spin coated on micropatterned Parylene C obtaining composite substrates with 460 nm and 1.15 µm high grooves. The Young's modulus of the composite Parylene C/PDMS was evaluated and it was found to be almost half when compared to PDMS. PAm hydrogel was also printed using collagen coated micro-grooved Parylene C. Optical micrographs and fluorescence analysis show the successful topographic and protein pattern transfer on the hydrogel.
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Affiliation(s)
- Ilaria Sanzari
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom. .,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom.
| | - Mauro Callisti
- Engineering Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Antonio De Grazia
- Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Daniel J Evans
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom.,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Tomas Polcar
- Engineering Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
| | - Themistoklis Prodromakis
- Nanoelectronics & Nanotechnology Research Group, Department of Electronics and Computer Science, Faculty of Physical Science and Engineering, University of Southampton, University Road, Southampton, SO17 1BJ, United Kingdom.,Department of Electronics and Computer Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
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Perozziello G, Candeloro P, De Grazia A, Esposito F, Allione M, Coluccio ML, Tallerico R, Valpapuram I, Tirinato L, Das G, Giugni A, Torre B, Veltri P, Kruhne U, Della Valle G, Di Fabrizio E. Microfluidic device for continuous single cells analysis via Raman spectroscopy enhanced by integrated plasmonic nanodimers. Opt Express 2016; 24:A180-A190. [PMID: 26832572 DOI: 10.1364/oe.24.00a180] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work a Raman flow cytometer is presented. It consists of a microfluidic device that takes advantages of the basic principles of Raman spectroscopy and flow cytometry. The microfluidic device integrates calibrated microfluidic channels- where the cells can flow one-by-one -, allowing single cell Raman analysis. The microfluidic channel integrates plasmonic nanodimers in a fluidic trapping region. In this way it is possible to perform Enhanced Raman Spectroscopy on single cell. These allow a label-free analysis, providing information about the biochemical content of membrane and cytoplasm of the each cell. Experiments are performed on red blood cells (RBCs), peripheral blood lymphocytes (PBLs) and myelogenous leukemia tumor cells (K562).
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