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Chrysanthou A, Bosch-Fortea M, Gautrot JE. Co-Surfactant-Free Bioactive Protein Nanosheets for the Stabilization of Bioemulsions Enabling Adherent Cell Expansion. Biomacromolecules 2023; 24:4465-4477. [PMID: 36683574 PMCID: PMC10565825 DOI: 10.1021/acs.biomac.2c01289] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/03/2023] [Indexed: 01/24/2023]
Abstract
Bioemulsions are attractive platforms for the scalable expansion of adherent cells and stem cells. In these systems, cell adhesion is enabled by the assembly of protein nanosheets that display high interfacial shear moduli and elasticity. However, to date, most successful systems reported to support cell adhesion at liquid substrates have been based on coassemblies of protein and reactive cosurfactants, which limit the translation of bioemulsions. In this report, we describe the design of protein nanosheets based on two globular proteins, bovine serum albumin (BSA) and β-lactoglobulin (BLG), biofunctionalized with RGDSP peptides to enable cell adhesion. The interfacial mechanics of BSA and BLG assemblies at fluorinated liquid-water interfaces is studied by interfacial shear rheology, with and without cosurfactant acyl chloride. Conformational changes associated with globular protein assembly are studied by circular dichroism and protein densities at fluorinated interfaces are evaluated via surface plasmon resonance. Biofunctionalization mediated by sulfo-succinimidyl 4-(N-maleimidomethyl) cyclohexane-1-carboxylate (sulfo-SMCC) is studied by fluorescence microscopy. On the basis of the relatively high elasticities observed in the case of BLG nanosheets, even in the absence of cosurfactant, the adhesion and proliferation of mesenchymal stem cells and human embryonic kidney (HEK) cells on bioemulsions stabilized by RGD-functionalized protein nanosheets is studied. To account for the high cell spreading and proliferation observed at these interfaces, despite initial moderate interfacial elasticities, the deposition of fibronectin fibers at the surface of corresponding microdroplets is characterized by immunostaining and confocal microscopy. These results demonstrate the feasibility of achieving high cell proliferation on bioemulsions with protein nanosheets assembled without cosurfactants and establish strategies for rational design of scaffolding proteins enabling the stabilization of interfaces with strong shear mechanics and elasticity, as well as bioactive and cell adhesive properties. Such protein nanosheets and bioemulsions are proposed to enable the development of new generations of bioreactors for the scale up of cell manufacturing.
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Affiliation(s)
- Alexandra Chrysanthou
- Institute
of Bioengineering and School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom
| | - Minerva Bosch-Fortea
- Institute
of Bioengineering and School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom
| | - Julien E. Gautrot
- Institute
of Bioengineering and School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom
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2
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Continuous-flow synthesis of amphiphilic rhodamine B-polymethylsilsesquioxane fluorescent microspheres for micro-PIV analysis. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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4
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Calhoun SGK, Brower KK, Suja VC, Kim G, Wang N, McCully AL, Kusumaatmaja H, Fuller GG, Fordyce PM. Systematic characterization of effect of flow rates and buffer compositions on double emulsion droplet volumes and stability. LAB ON A CHIP 2022; 22:2315-2330. [PMID: 35593127 PMCID: PMC9195911 DOI: 10.1039/d2lc00229a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 05/03/2022] [Indexed: 06/15/2023]
Abstract
Double emulsion droplets (DEs) are water/oil/water droplets that can be sorted via fluorescence-activated cell sorting (FACS), allowing for new opportunities in high-throughput cellular analysis, enzymatic screening, and synthetic biology. These applications require stable, uniform droplets with predictable microreactor volumes. However, predicting DE droplet size, shell thickness, and stability as a function of flow rate has remained challenging for monodisperse single core droplets and those containing biologically-relevant buffers, which influence bulk and interfacial properties. As a result, developing novel DE-based bioassays has typically required extensive initial optimization of flow rates to find conditions that produce stable droplets of the desired size and shell thickness. To address this challenge, we conducted systematic size parameterization quantifying how differences in flow rates and buffer properties (viscosity and interfacial tension at water/oil interfaces) alter droplet size and stability, across 6 inner aqueous buffers used across applications such as cellular lysis, microbial growth, and drug delivery, quantifying the size and shell thickness of >22 000 droplets overall. We restricted our study to stable single core droplets generated in a 2-step dripping-dripping formation regime in a straightforward PDMS device. Using data from 138 unique conditions (flow rates and buffer composition), we also demonstrated that a recent physically-derived size law of Wang et al. can accurately predict double emulsion shell thickness for >95% of observations. Finally, we validated the utility of this size law by using it to accurately predict droplet sizes for a novel bioassay that requires encapsulating growth media for bacteria in droplets. This work has the potential to enable new screening-based biological applications by simplifying novel DE bioassay development.
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Affiliation(s)
- Suzanne G K Calhoun
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Kara K Brower
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
- ChEM-H Institute, Stanford University, Stanford, CA 94305, USA
| | - Vineeth Chandran Suja
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
- School of Engineering and Applied Sciences, Harvard University, MA - 01234, USA
| | - Gaeun Kim
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
| | - Ningning Wang
- School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Alexandra L McCully
- Department of Civil & Environmental Engineering, Stanford University, Stanford, CA 94305, USA
| | | | - Gerald G Fuller
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Polly M Fordyce
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
- ChEM-H Institute, Stanford University, Stanford, CA 94305, USA
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
- Chan Zuckerberg BioHub, San Francisco, CA 94158, USA
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5
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Evolution of Water-in-Oil Droplets in T-Junction Microchannel by Micro-PIV. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11115289] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Water-in-oil droplets have huge importance in chemical and biotechnology applications, despite their difficulty being produced in microfluidics. Moreover, existing studies focus more on the different shape of microchannels instead of their size, which is one of the critical factors that can influence flow characteristics of the droplets. Therefore, the present work aims to study the behaviours of water-in-oil droplets at the interfacial surface in an offset T-junction microchannel, having different radiuses, using micro-PIV software. Food-grade palm olein and distilled water seeded with polystyrene microspheres particles were used as working fluids, and their captured images showing their generated droplets’ behaviours focused on the junction of the respective microfluidic channel, i.e., radiuses of 400 µm, 500 µm, 750 µm and 1000 µm, were analysed via PIVlab. The increasing in the radius of the offset T-junction microchannel leads to the increase in the cross-sectional area and the decrease in the distilled water phase’s velocity. The experimental velocity of the water droplet is in agreement with theoretical values, having a minimal difference as low as 0.004 mm/s for the case of the microchannel with a radius of 750 µm. In summary, a small increase in the channel’s size yields a significant increase in the overall flow of a liquid.
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6
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Ma S, Zhao H, Galan EA, Balabani S. Modulating Flow Topology in Microdroplets to Control Reaction Kinetics. Adv Biol (Weinh) 2021. [DOI: 10.1002/adbi.202000309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shaohua Ma
- Institute of Biopharmaceutical and Health Engineering (iBHE) Shenzhen International Graduate School (SIGS) Tsinghua University Shenzhen 518055 China
- Tsinghua‐Berkeley Shenzhen Institute (TBSI) Tsinghua University Shenzhen 518055 China
| | - Haoran Zhao
- Institute of Biopharmaceutical and Health Engineering (iBHE) Shenzhen International Graduate School (SIGS) Tsinghua University Shenzhen 518055 China
- Tsinghua‐Berkeley Shenzhen Institute (TBSI) Tsinghua University Shenzhen 518055 China
| | - Edgar A. Galan
- Institute of Biopharmaceutical and Health Engineering (iBHE) Shenzhen International Graduate School (SIGS) Tsinghua University Shenzhen 518055 China
- Tsinghua‐Berkeley Shenzhen Institute (TBSI) Tsinghua University Shenzhen 518055 China
| | - Stavroula Balabani
- Department of Mechanical Engineering University College London London WC1E 6BT UK
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Jiang S, Zhao H, Zhang W, Wang J, Liu Y, Cao Y, Zheng H, Hu Z, Wang S, Zhu Y, Wang W, Cui S, Lobie PE, Huang L, Ma S. An Automated Organoid Platform with Inter-organoid Homogeneity and Inter-patient Heterogeneity. CELL REPORTS MEDICINE 2020; 1:100161. [PMID: 33377132 PMCID: PMC7762778 DOI: 10.1016/j.xcrm.2020.100161] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/20/2020] [Accepted: 11/24/2020] [Indexed: 12/11/2022]
Abstract
Current organoid technologies require intensive manual manipulation and lack uniformity in organoid size and cell composition. We present here an automated organoid platform that generates uniform organoid precursors in high-throughput. This is achieved by templating from monodisperse Matrigel droplets and sequentially delivering them into wells using a synchronized microfluidic droplet printer. Each droplet encapsulates a certain number of cells (e.g., 1,500 cells), which statistically represent the heterogeneous cell population in a tumor section. The system produces >400-μm organoids within 1 week with both inter-organoid homogeneity and inter-patient heterogeneity. This enables automated organoid printing to obtain one organoid per well. The organoids recapitulate 97% gene mutations in the parental tumor and reflect the patient-to-patient variation in drug response and sensitivity, from which we obtained more than 80% accuracy among the 21 patients investigated. This organoid platform is anticipated to fulfill the personalized medicine goal of 1-week high-throughput screening for cancer patients.
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Affiliation(s)
- Shengwei Jiang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Haoran Zhao
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Weijie Zhang
- Department of Oncology, The First Affiliated Hospital of Zhengzhou University, No1 Jianshe East Road, Zhengzhou 450052, China
| | - Jiaqi Wang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Yuhong Liu
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yuanxiong Cao
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Honghui Zheng
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Zhiwei Hu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Shubin Wang
- Department of Oncology, Peking University Shenzhen Hospital, Shenzhen Key Laboratory of Gastrointestinal Cancer Translational Research, Cancer Institute of Shenzhen PKU-HKUST Medical Center, 1120 Lianhua Road, Shenzhen 518036, China
| | - Yu Zhu
- Department of Oncology, Peking University Shenzhen Hospital, Shenzhen Key Laboratory of Gastrointestinal Cancer Translational Research, Cancer Institute of Shenzhen PKU-HKUST Medical Center, 1120 Lianhua Road, Shenzhen 518036, China
| | - Wei Wang
- Department of Pathology, Shenzhen University General Hospital, Shenzhen 518055, China
| | - Shuzhong Cui
- Department of Abdominal Surgery, Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou 510095, China
| | - Peter E. Lobie
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
| | - Laiqiang Huang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
- Department of Chemistry, Tsinghua University, Beijing 100084, China
- Corresponding author
| | - Shaohua Ma
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Shenzhen International Graduate School (SIGS), Shenzhen Key Laboratory of Gene and Antibody Therapy, State Key Laboratory of Chemical Oncogenomics, Tsinghua University, Shenzhen 518055, China
- Corresponding author
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8
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Wang T, Xu C. Liquid-liquid-liquid three-phase microsystem: hybrid slug flow-laminar flow. LAB ON A CHIP 2020; 20:1891-1897. [PMID: 32409801 DOI: 10.1039/d0lc00292e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Liquid-liquid-liquid three-phase microfluidics provides abundant flow patterns and attractive characteristics that substantially extend the applications of liquid-liquid two-phase microfluidics. Although the manipulation of stable interfaces between adjacent liquid phases is a prerequisite for the successful utilization of three-phase flows, it is challenging. In this study, we develop a novel liquid-liquid-liquid three-phase microsystem that is a hybrid slug flow-laminar flow microchip, in which one aqueous phase makes contact with one organic phase containing slugs of another aqueous phase. The organic phase separates the two aqueous phases, and the three phases co-currently flow. The microchip can simultaneously provide a stable continuous water-oil interface and multiple segregated oil-water interfaces. The design guideline, flow pattern map, and influence rules for the flow rates and the interfacial tension are discussed in detail. Furthermore, a hybrid slug flow-laminar flow microchip is demonstrated for simultaneous extraction/stripping. This three-phase microsystem presents the advantages of slug flow and laminar flow and has potential in various applications such as sample purification, analysis, synthesis, and micro-reactions.
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Affiliation(s)
- Tao Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, P. R. China.
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9
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Cao Y, Zhao H, Hu Z, Ma S. Cascade Pumping Overcomes Hydraulic Resistance and Moderates Shear Conditions for Slow Gelatin Fiber Shaping in Narrow Tubes. iScience 2020; 23:101228. [PMID: 32540773 PMCID: PMC7298654 DOI: 10.1016/j.isci.2020.101228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/06/2020] [Accepted: 05/28/2020] [Indexed: 11/30/2022] Open
Abstract
In microextrusion-based 3D bioprinting, shaping gel fibers online, i.e., in narrow tubes, benefits the structural maintenance after extrusion, but it is challenging for materials possessing slow sol-gel transition dynamics. Gelatin, for example, transforms into thermostable fibers via transglutaminase (TG) reaction in as much as 10 min. It causes dramatic flow resistance accumulation and shear stress increase in fluids moving along narrow tubes, resulting in channel clogging and cell detriments. In this study, we overcome the limitations by adopting cascade pumping and performing in a single peristaltic pump that comprises multi-channel pumping units. The pressure and shear stress reduction by over 1-fold are verified by finite element simulation; continuous gelatin fiber production and patterning in a substrate-free manner are achieved via slow online enzymatic cross-linking. The online fiber shaping can be scaled up by numbering up the pumping units and provides another paradigm for biomanufacturing. Cascade pumping overcomes hydraulic resistance and reduces shear stress significantly Cascade pumping suits online gelatin fiber shaping via slow enzymatic cross-linking Online fiber shaping enables substrate-free 3D printing Gelatin fibers are stronger when gelled via thermal and enzymatic dual cross-linking
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Affiliation(s)
- Yuanxiong Cao
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518055, China; Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, 518055, China
| | - Haoran Zhao
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518055, China; Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, 518055, China
| | - Zhiwei Hu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518055, China; Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, 518055, China
| | - Shaohua Ma
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518055, China; Tsinghua Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen, 518055, China.
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10
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Zou P, Li M, Wang Z, Zhang G, Jin L, Pang Y, Du L, Duan Y, Liu Z, Shi Q. Micro-Particle Image Velocimetry Investigation of Flow Fields of SonoVue Microbubbles Mediated by Ultrasound and Their Relationship With Delivery. Front Pharmacol 2020; 10:1651. [PMID: 32116672 PMCID: PMC7025580 DOI: 10.3389/fphar.2019.01651] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 12/16/2019] [Indexed: 12/04/2022] Open
Abstract
The flow fields generated by the acoustic behavior of microbubbles can significantly increase cell permeability. This facilitates the cellular uptake of external molecules in a process known as ultrasound-mediated drug delivery. To promote its clinical translation, this study investigated the relationships among the ultrasound parameters, acoustic behavior of microbubbles, flow fields, and delivery results. SonoVue microbubbles were activated by 1 MHz pulsed ultrasound with 100 Hz pulse repetition frequency, 1:5 duty cycle, and 0.20/0.35/0.70 MPa peak rarefactional pressure. Micro-particle image velocimetry was used to detect the microbubble behavior and the resulting flow fields. Then HeLa human cervical cancer cells were treated with the same conditions for 2, 4, 10, 30, and 60 s, respectively. Fluorescein isothiocyanate and propidium iodide were used to quantitate the rates of sonoporated cells with a flow cytometer. The results indicate that (1) microbubbles exhibited different behavior in ultrasound fields of different peak rarefactional pressures. At peak rarefactional pressures of 0.20 and 0.35 MPa, the dispersed microbubbles clumped together into clusters, and the clusters showed no apparent movement. At a peak rarefactional pressure of 0.70 MPa, the microbubbles were partially broken, and the remainders underwent clustering and coalescence to form bubble clusters that exhibited translational oscillation. (2) The flow fields were unsteady before the unification of the microbubbles. After that, the flow fields showed a clear pattern. (3)The delivery efficiency improved with the shear stress of the flow fields increased. Before the formation of the microbubble/bubble cluster, the maximum shear stresses of the 0.20, 0.35, and 0.70 MPa groups were 56.0, 87.5 and 406.4 mPa, respectively, and the rates of the reversibly sonoporated cells were 2.4% ± 0.4%, 5.5% ± 1.3%, and 16.6% ± 0.2%. After the cluster formation, the maximum shear stresses of the three groups were 9.1, 8.7, and 71.7 mPa, respectively. The former two could not mediate sonoporation, whereas the last one could. These findings demonstrate the critical role of flow fields in ultrasound-mediated drug delivery and contribute to its clinical applications.
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Affiliation(s)
- Penglin Zou
- Department of Ultrasound, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mengqi Li
- College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China
| | - Ziqi Wang
- Department of Ultrasound, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guoxiu Zhang
- Department of Emergency, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang, China
| | - Lifang Jin
- Department of Ultrasound, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Pang
- College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China
| | - Lianfang Du
- Department of Ultrasound, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yourong Duan
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhaomiao Liu
- College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China
| | - Qiusheng Shi
- Department of Ultrasound, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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11
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Wang X, Liu Z, Pang Y. Breakup dynamics of droplets in an asymmetric bifurcation by μPIV and theoretical investigations. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.12.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Ma S, Mukherjee N. Microfluidics Fabrication of Soft Microtissues and Bottom-Up Assembly. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/adbi.201800119] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Shaohua Ma
- Tsinghua-Berkeley Shenzhen Institute; Tsinghua University; Shenzhen China
| | - Nobina Mukherjee
- Department of Chemistry; University of Oxford; OX1 3TA Oxford UK
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Ma S, Mukherjee N, Mikhailova E, Bayley H. Gel Microrods for 3D Tissue Printing. ACTA ACUST UNITED AC 2017; 1:e1700075. [DOI: 10.1002/adbi.201700075] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/31/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Shaohua Ma
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Nobina Mukherjee
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Ellina Mikhailova
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Hagan Bayley
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
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14
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Wang X, Liu Z, Pang Y. Concentration gradient generation methods based on microfluidic systems. RSC Adv 2017. [DOI: 10.1039/c7ra04494a] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Various concentration gradient generation methods based on microfluidic systems are summarized in this paper.
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Affiliation(s)
- Xiang Wang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Zhaomiao Liu
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Yan Pang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
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15
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Ma S, Huck WTS, Balabani S. Deformation of double emulsions under conditions of flow cytometry hydrodynamic focusing. LAB ON A CHIP 2015; 15:4291-4301. [PMID: 26394745 DOI: 10.1039/c5lc00693g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Water-in-oil-in-water (w/o/w) microfluidics double emulsions offer a new route to compartmentalise reagents into isolated aqueous microenvironments while maintaining an aqueous carrier fluid phase; this enables compatibility with commercial flow cytometry systems such as fluorescence-activated cell sorting (FACS). Double emulsion (inner core) deformation under hydrodynamic focusing conditions that mimic the environment double emulsions experience in flow cytometry applications is of particular importance for droplet stability and cell viability. This paper reports on an experimental study of the dynamic deformation of aqueous cores of w/o/w double emulsions under hydrodynamic focusing, with the sheath flow directed at 45° to the sample flow. A number of factors affecting the inner core deformation and recovery were examined. Deformation was found to depend significantly on the core or shell viscosity, the droplet-to-sheath flow velocity ratio, and core and shell sizes. Core deformation was found to depend more on the type of surfactant rather concentration with high molecular weight surfactant exhibiting a negligible effect on deformation whereas low molecular weight surfactant enhancing deformation at low concentrations due to their lateral mobility at the interface.
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Affiliation(s)
- Shaohua Ma
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK and Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA, UK
| | - Wilhelm T S Huck
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK and Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525, AJ Nijmegen, The Netherlands
| | - Stavroula Balabani
- Department of Mechanical Engineering, University College London, London, WC1E 7JE, UK.
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