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Cambiaso S, Rasera F, Rossi G, Bochicchio D. Development of a transferable coarse-grained model of polydimethylsiloxane. SOFT MATTER 2022; 18:7887-7896. [PMID: 36206016 DOI: 10.1039/d2sm00939k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Polydimethylsiloxane (PDMS) is a popular silicon-based polymer with advanced applications in microfluidics and nanocomposites. The slow dynamics of polymer chains in such complex systems hinders molecular dynamics investigations based on all atom force fields. This limitation can be overcome by exploiting finely tuned coarse-grained (CG) models. This paper develops a transferable CG model of PDMS, compatible with the recent Martini 3 force field, using structural and thermodynamic properties as targets in the parametrization, including a vast set of experimental free energies of transfer. We validate the model transferability by reproducing the correct scaling laws for the PDMS gyration radius in the melt and good and bad solvents. We successfully test the model by reproducing the wetting behavior of water and acetonitrile on PDMS and the phase behavior of a PDMS-peptide triblock copolymer system. This work sets the stage for computational studies involving the interaction between PDMS and many synthetic and biological molecules modeled within the Martini framework.
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Affiliation(s)
- Sonia Cambiaso
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
| | - Fabio Rasera
- Dept of Mechanical and Aerospace Engineering, University of Rome La Sapienza, Via Eudossiana 18, 00184 Rome, Italy
| | - Giulia Rossi
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
| | - Davide Bochicchio
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
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2
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Photothermally-Heated Superparamagnetic Polymeric Nanocomposite Implants for Interstitial Thermotherapy. NANOMATERIALS 2022; 12:nano12060955. [PMID: 35335769 PMCID: PMC8950572 DOI: 10.3390/nano12060955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/02/2022] [Accepted: 03/04/2022] [Indexed: 02/01/2023]
Abstract
Photothermally-heated polymer-based superparamagnetic nanocomposite (SNC) implants have the potential to overcome limitations of the conventional inductively-heated ferromagnetic metallic alloy implants for interstitial thermotherapy (IT). This paper presents an assessment of a model SNC—poly-dimethylsiloxane (PDMS) and Fe3O4 nanoparticles (MNP)—implant for IT. First, we performed structural and optical characterization of the commercially purchased MNPs, which were added to the PDMS to prepare the SNCs (MNP weight fraction =10 wt.%) that were used to fabricate cubic implants. We studied the structural properties of SNC and characterized the photothermal heating capabilities of the implants in three different media: aqueous solution, cell (in-vitro) suspensions and agarose gel. Our results showed that the spherical MNPs, whose optical absorbance increased with concentration, were uniformly distributed within the SNC with no new bond formed with the PDMS matrix and the SNC implants generated photothermal heat that increased the temperature of deionized water to different levels at different rates, decreased the viability of MDA-MB-231 cells and regulated the lesion size in agarose gel as a function of laser power only, laser power or exposure time and the number of implants, respectively. We discussed the opportunities it offers for the development of a smart and efficient strategy that can enhance the efficacy of conventional interstitial thermotherapy. Collectively, this proof-of-concept study shows the feasibility of a photothermally-heated polymer-based SNC implant technique.
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Kim H, Park S, Jeong IG, Song SH, Jeong Y, Kim CS, Lee KH. Noninvasive Precision Screening of Prostate Cancer by Urinary Multimarker Sensor and Artificial Intelligence Analysis. ACS NANO 2021; 15:4054-4065. [PMID: 33296173 DOI: 10.1021/acsnano.0c06946] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Screening for prostate cancer relies on the serum prostate-specific antigen test, which provides a high rate of false positives (80%). This results in a large number of unnecessary biopsies and subsequent overtreatment. Considering the frequency of the test, there is a critical unmet need of precision screening for prostate cancer. Here, we introduced a urinary multimarker biosensor with a capacity to learn to achieve this goal. The correlation of clinical state with the sensing signals from urinary multimarkers was analyzed by two common machine learning algorithms. As the number of biomarkers was increased, both algorithms provided a monotonic increase in screening performance. Under the best combination of biomarkers, the machine learning algorithms screened prostate cancer patients with more than 99% accuracy using 76 urine specimens. Urinary multimarker biosensor leveraged by machine learning analysis can be an important strategy of precision screening for cancers using a drop of bodily fluid.
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Affiliation(s)
- Hojun Kim
- Biomaterials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Sungwook Park
- Biomaterials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - In Gab Jeong
- Department of Urology, Asan Medical Center (AMC), University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Sang Hoon Song
- Department of Urology, Asan Medical Center (AMC), University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Youngdo Jeong
- Biomaterials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Choung-Soo Kim
- Department of Urology, Asan Medical Center (AMC), University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Kwan Hyi Lee
- Biomaterials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
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Konku-Asase YK, Kan-Dapaah K. Plasmonic Nanocomposite Implants for Interstitial Thermotherapy: Experimental and Computational Analysis. MATERIALS 2021; 14:ma14040841. [PMID: 33578715 PMCID: PMC7916463 DOI: 10.3390/ma14040841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/06/2021] [Accepted: 02/07/2021] [Indexed: 11/16/2022]
Abstract
The ferromagnetic implant (thermoseeds) technique offers desirable features for interstitial thermotherapy. However, its efficacy has been reported to be limited by issues that are related to the properties of the metal alloys that are used to fabricate them and the high number of thermoseeds needed to achieve therapeutic temperature levels. Here, we present the results of a combination of experimental and computational analysis of plasmonic nanocomposite implants (photoseeds)—a combination of Au nanoparticles (NPs) and poly-dimethylsiloxane (PDMS)—as a model material. We performed structural and optical characterization of the Au NPs and repared Au-PDMS nanocomposites, followed by an elucidation of the heat generation capabilities of the Au-PDMS photoseeds in aqueous solution and in-vitro cancer cell suspension. Based on the experimental results, we developed a three-dimensional (3D) finite element method (FEM) model to predict in-vivo thermal damage profiles in breast tissue. The optical absorbance of the Au-PDMS photoseeds were increasing with the concentration of Au NPs. The photothermal measurements and the in-vivo predictions showed that the photothermal properties of the photoseeds, characteristics of the laser sources, and the duration of heating can be tuned to achieve therapeutic temperature levels under in-vitro and in-vivo conditions. Collectively, the results demonstrate the feasibility of using photoseeds for interstitial thermotherapy.
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Somaweera H, Estlack Z, Devadhasan JP, Kim J, Kim J. Characterization and Optimization of Isotachophoresis Parameters for Pacific Blue Succinimidyl Ester Dye on a PDMS Microfluidic Chip. MICROMACHINES 2020; 11:mi11110951. [PMID: 33105673 PMCID: PMC7690402 DOI: 10.3390/mi11110951] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/20/2020] [Accepted: 10/20/2020] [Indexed: 01/23/2023]
Abstract
Isotachophoresis (ITP) for Pacific Blue (PB) dye using a polydimethylsiloxane (PDMS) microfluidic chip is developed and characterized by determining the types and concentrations of electrolytes, the ITP duration, and the electric field density. Among candidate buffers for the trailing electrolyte (TE) and leading electrolyte (LE), 40 mM borate buffer (pH 9) and 200 mM trisaminomethane hydrochloride (Tris-HCl) (pH 8) were selected to obtain the maximum preconcentration and resolution of the PB bands, respectively. With the selected TE and LE buffers, further optimization was performed to determine the electric field (EF) density and the ITP duration. These ITP parameters showed a 20–170,000 preconcentration ratio from initial PB concentrations of 10 nM–100 fM. Further demonstration was implemented to preconcentrate PB-conjugated lactate dehydrogenase (LDH) using the PDMS microfluidic chip. By utilizing the quenching nature of PB-LDH conjugation, we were able to identify concentrations of LDH as low as 10 ng/mL. This simple PDMS microfluidic chip-based ITP for PB preconcentration enables highly sensitive biological and chemical analyses by coupling with various downstream detection systems.
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Affiliation(s)
- Himali Somaweera
- Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA; (H.S.); (J.P.D.)
| | - Zachary Estlack
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA;
| | | | | | - Jungkyu Kim
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA;
- Correspondence: ; Tel.: +1-(801)-581-6743
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Dai J, Kong N, Lu Y, Yuan Y, Wu Q, Shi M, Zhang S, Wu Y, Peng W, Huang P, Chen X, Gong J, Yao Y. Bioinspired Conical Micropattern Modulates Cell Behaviors. ACS APPLIED BIO MATERIALS 2018; 1:1416-1423. [DOI: 10.1021/acsabm.8b00362] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jing Dai
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
- Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Dingxi Road, Changning, Shanghai 200050, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Shijingshan, Beijing 100049, China
| | - Na Kong
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Yi Lu
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Yangyang Yuan
- School of Life Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Qiong Wu
- Institute of Insect Science, College of Agriculture and Biotechnology, Zhejiang University, 310058 Hangzhou, China
| | - Min Shi
- Institute of Insect Science, College of Agriculture and Biotechnology, Zhejiang University, 310058 Hangzhou, China
| | - Siyi Zhang
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Yuzhe Wu
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Wenbo Peng
- School of Life Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Pengyu Huang
- School of Life Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Xuexin Chen
- Institute of Insect Science, College of Agriculture and Biotechnology, Zhejiang University, 310058 Hangzhou, China
| | - Jinkang Gong
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
| | - Yuan Yao
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
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Ma S, Jin L, Huang X, Riziotis C, Huang R, Zhang C, Lu J, Yang W. Nanogenerators Begin to Light Up: A Novel Poling-Free Piezoelectric System with Multicolor Photoluminescence as an Efficient Mechatronics Development Platform. ADVANCED MATERIALS INTERFACES 2018. [DOI: 10.1002/admi.201800587] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Songyuan Ma
- Key Laboratory of Advanced Technologies of Materials; Ministry of Education; School of Materials Science and Engineering; Southwest Jiaotong University; Chengdu 610031 Sichuan China
| | - Long Jin
- Key Laboratory of Advanced Technologies of Materials; Ministry of Education; School of Materials Science and Engineering; Southwest Jiaotong University; Chengdu 610031 Sichuan China
| | - Xi Huang
- Key Laboratory of Advanced Technologies of Materials; Ministry of Education; School of Materials Science and Engineering; Southwest Jiaotong University; Chengdu 610031 Sichuan China
| | - Christos Riziotis
- Theoretical & Physical Chemistry Institute; National Hellenic Research Foundation; Athens 11635 Greece
| | - Rui Huang
- College of Polymer Materials Science and Engineering; Sichuan University; Chengdu 610065 Sichuan China
| | - Chaoliang Zhang
- State Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu 610041 China
| | - Jun Lu
- Key Laboratory of Advanced Technologies of Materials; Ministry of Education; School of Materials Science and Engineering; Southwest Jiaotong University; Chengdu 610031 Sichuan China
| | - Weiqing Yang
- Key Laboratory of Advanced Technologies of Materials; Ministry of Education; School of Materials Science and Engineering; Southwest Jiaotong University; Chengdu 610031 Sichuan China
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Ricotti L, Gori G, Cei D, Costa J, Signore G, Ahluwalia A. Polymeric Microporous Nanofilms as Smart Platforms for in Vitro Assessment of Nanoparticle Translocation and Caco-2 Cell Culture. IEEE Trans Nanobioscience 2016; 15:689-696. [PMID: 27576259 DOI: 10.1109/tnb.2016.2603191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The study of nanomaterial translocation across epithelial barriers is often hindered by the low permeability of transwell membranes to nanoparticles. To address this issue ultra-thin poly(L-lactic acid) nanofilms with zero tortuosity micropores were developed for use in nanoparticle passage tests. In this study we demonstrate that microporous polymeric nanofilms allow a significantly higher passage of silver nanoparticles in comparison with commercial membranes normally used in transwell inserts. A reliable procedure for collecting free-standing nanofilms which enables their manipulation and use in lab-on-chip systems is described. We also demonstrate the cytocompatibility of porous nanofilms and their ability to sustain the adhesion and proliferation of Caco-2 cells. Ultra-thin microporous membranes show promise as low-cost nanomaterial screening tools and may be used as matrices for the development of bioengineered systems for mimicking the intestinal epithelium.
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