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Zhang Y, Xian H, Strounina E, Gunther KS, Sweet MJ, Chen C, Yu C, Wang Y. Mesoporous Organosilica Nanoparticles with Tetrasulphide Bond to Enhance Plasmid DNA Delivery. Pharmaceutics 2023; 15:1013. [DOI: https:/doi.org/10.3390/pharmaceutics15031013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2024] Open
Abstract
Cellular delivery of plasmid DNA (pDNA) specifically into dendritic cells (DCs) has provoked wide attention in various applications. However, delivery tools that achieve effective pDNA transfection in DCs are rare. Herein, we report that tetrasulphide bridged mesoporous organosilica nanoparticles (MONs) have enhanced pDNA transfection performance in DC cell lines compared to conventional mesoporous silica nanoparticles (MSNs). The mechanism of enhanced pDNA delivery efficacy is attributed to the glutathione (GSH) depletion capability of MONs. Reduction of initially high GSH levels in DCs further increases the mammalian target of rapamycin complex 1 (mTORc1) pathway activation, enhancing translation and protein expression. The mechanism was further validated by showing that the increased transfection efficiency was apparent in high GSH cell lines but not in low GSH ones. Our findings may provide a new design principle of nano delivery systems where the pDNA delivery to DCs is important.
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Affiliation(s)
- Yue Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - He Xian
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Ekaterina Strounina
- Centre for Advanced Imaging, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Kimberley S. Gunther
- Institute for Molecular Bioscience (IMB), IMB Centre for Inflammation and Disease Research, and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Matthew J. Sweet
- Institute for Molecular Bioscience (IMB), IMB Centre for Inflammation and Disease Research, and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Chen Chen
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Yue Wang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
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2
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Zhang Y, Xian H, Strounina E, Gunther KS, Sweet MJ, Chen C, Yu C, Wang Y. Mesoporous Organosilica Nanoparticles with Tetrasulphide Bond to Enhance Plasmid DNA Delivery. Pharmaceutics 2023; 15:pharmaceutics15031013. [PMID: 36986873 PMCID: PMC10053670 DOI: 10.3390/pharmaceutics15031013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/08/2023] [Accepted: 03/14/2023] [Indexed: 03/30/2023] Open
Abstract
Cellular delivery of plasmid DNA (pDNA) specifically into dendritic cells (DCs) has provoked wide attention in various applications. However, delivery tools that achieve effective pDNA transfection in DCs are rare. Herein, we report that tetrasulphide bridged mesoporous organosilica nanoparticles (MONs) have enhanced pDNA transfection performance in DC cell lines compared to conventional mesoporous silica nanoparticles (MSNs). The mechanism of enhanced pDNA delivery efficacy is attributed to the glutathione (GSH) depletion capability of MONs. Reduction of initially high GSH levels in DCs further increases the mammalian target of rapamycin complex 1 (mTORc1) pathway activation, enhancing translation and protein expression. The mechanism was further validated by showing that the increased transfection efficiency was apparent in high GSH cell lines but not in low GSH ones. Our findings may provide a new design principle of nano delivery systems where the pDNA delivery to DCs is important.
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Affiliation(s)
- Yue Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - He Xian
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Ekaterina Strounina
- Centre for Advanced Imaging, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Kimberley S Gunther
- Institute for Molecular Bioscience (IMB), IMB Centre for Inflammation and Disease Research, and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Matthew J Sweet
- Institute for Molecular Bioscience (IMB), IMB Centre for Inflammation and Disease Research, and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Chen Chen
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Yue Wang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
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Cruz H, Laycock B, Strounina E, Seviour T, Oehmen A, Pikaar I. Modified Poly(acrylic acid)-Based Hydrogels for Enhanced Mainstream Removal of Ammonium from Domestic Wastewater. Environ Sci Technol 2020; 54:9573-9583. [PMID: 32551594 DOI: 10.1021/acs.est.9b07032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Rapid and continuous ammonium adsorption from mainstream coupled with side-stream ammonium recovery and adsorbent regeneration could enable ammonium recovery from domestic wastewater. This study describes the use of tailored poly(acrylic acid)-based (NaPAA) hydrogels as effective sorbents for ammonium removal from domestic wastewater. Modified NaPAA hydrogels having 60% ionization and 4.8 mol % N',N'-methylenebisacrylamide as the cross-linker reduced the overall swelling by 92% from 407 to 31 g/g because of higher cross-linking density. At hydrogel loadings of 2.5-7.5 g/L, the NaPAA hydrogels achieved ammonium concentrations of 8.3 ± 0.6 to 10.1 ± 0.1 mg/L NH4-N, which corresponds to removal efficiencies of 53-77% after 10 min of contact time in real domestic wastewater. At the same hydrogel loadings, the ammonium removal efficiency of NaPAA hydrogels in synthetic wastewater was found to be comparable to that in real sewage (71% vs 69%, respectively), suggesting that the sorption performance is only marginally affected by organic constituents found in domestic wastewater. In addition, the NaPAA hydrogels removed 25-51% ammonium in 10 min from synthetic streams having 200-400% higher ionic strengths than those commonly observed in sewage. Furthermore, simulation studies showed that a discharge concentration of ∼1.9 mg/L NH4-N, well below the commonly applied discharge limits in most regions, can be achieved using mainstream ammonium removal by NaPAA hydrogels followed by biological assimilation from the growth of ordinary heterotrophic organisms.
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Affiliation(s)
- Heidy Cruz
- School of Civil Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Bronwyn Laycock
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ekaterina Strounina
- Center for Advanced Imaging, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Thomas Seviour
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 637551, Singapore
| | - Adrian Oehmen
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ilje Pikaar
- School of Civil Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
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Abeer MM, Meka AK, Pujara N, Kumeria T, Strounina E, Nunes R, Costa A, Sarmento B, Hasnain SZ, Ross BP, Popat A. Rationally Designed Dendritic Silica Nanoparticles for Oral Delivery of Exenatide. Pharmaceutics 2019; 11:E418. [PMID: 31430872 PMCID: PMC6723263 DOI: 10.3390/pharmaceutics11080418] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/04/2019] [Accepted: 08/15/2019] [Indexed: 01/17/2023] Open
Abstract
Type 2 diabetes makes up approximately 85% of all diabetic cases and it is linked to approximately one-third of all hospitalisations. Newer therapies with long-acting biologics such as glucagon-like peptide-1 (GLP-1) analogues have been promising in managing the disease, but they cannot reverse the pathology of the disease. Additionally, their parenteral administration is often associated with high healthcare costs, risk of infections, and poor patient adherence associated with phobia of needles. Oral delivery of these compounds would significantly improve patient compliance; however, poor enzymatic stability and low permeability across the gastrointestinal tract makes this task challenging. In the present work, large pore dendritic silica nanoparticles (DSNPs) with a pore size of ~10 nm were prepared, functionalized, and optimized in order to achieve high peptide loading and improve intestinal permeation of exenatide, a GLP-1 analogue. Compared to the loading capacity of the most popular, Mobil Composition of Matter No. 41 (MCM-41) with small pores, DSNPs showed significantly high loading owing to their large and dendritic pore structure. Among the tested DSNPs, pristine and phosphonate-modified DSNPs (PDSNPs) displayed remarkable loading of 40 and 35% w/w, respectively. Furthermore, particles successfully coated with positively charged chitosan reduced the burst release of exenatide at both pH 1.2 and 6.8. Compared with free exenatide, both chitosan-coated and uncoated PDSNPs enhanced exenatide transport through the Caco-2 monolayer by 1.7 fold. Interestingly, when a triple co-culture model of intestinal permeation was used, chitosan-coated PDSNPs performed better compared to both PDSNPs and free exenatide, which corroborated our hypothesis behind using chitosan to interact with mucus and improve permeation. These results indicate the emerging role of large pore silica nanoparticles as promising platforms for oral delivery of biologics such as exenatide.
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Affiliation(s)
| | - Anand Kumar Meka
- School of Pharmacy, The University of Queensland, Brisbane QLD 4072, Australia
| | - Naisarg Pujara
- School of Pharmacy, The University of Queensland, Brisbane QLD 4072, Australia
| | - Tushar Kumeria
- School of Pharmacy, The University of Queensland, Brisbane QLD 4072, Australia
- Mater Research Institute-The University of Queensland, Translational Research Institute, Woolloongabba QLD 4102, Australia
| | - Ekaterina Strounina
- Center for Advanced Imaging, The University of Queensland, Brisbane QLD 4072, Australia
| | - Rute Nunes
- Instituto de Investigação e Inovação em Saúde (I3S), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
- Instituto de Engenharia Biomédica (INEB), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
| | - Ana Costa
- Instituto de Investigação e Inovação em Saúde (I3S), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
- Instituto de Engenharia Biomédica (INEB), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
| | - Bruno Sarmento
- Instituto de Investigação e Inovação em Saúde (I3S), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
- Instituto de Engenharia Biomédica (INEB), University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, 1317, 4585-116 Gandra, Portugal
| | - Sumaira Z Hasnain
- Mater Research Institute-The University of Queensland, Translational Research Institute, Woolloongabba QLD 4102, Australia
- Australian Infectious Disease Research Centre-The University of Queensland Building 76 Room 155 Cooper Road, St. Lucia QLD 4067, Australia
| | - Benjamin P Ross
- School of Pharmacy, The University of Queensland, Brisbane QLD 4072, Australia
| | - Amirali Popat
- School of Pharmacy, The University of Queensland, Brisbane QLD 4072, Australia.
- Mater Research Institute-The University of Queensland, Translational Research Institute, Woolloongabba QLD 4102, Australia.
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Lee E, Nguyen CTH, Strounina E, Davis-Poynter N, Ross BP. Structure-Activity Relationships of GAG Mimetic-Functionalized Mesoporous Silica Nanoparticles and Evaluation of Acyclovir-Loaded Antiviral Nanoparticles with Dual Mechanisms of Action. ACS Omega 2018; 3:1689-1699. [PMID: 30023813 PMCID: PMC6045419 DOI: 10.1021/acsomega.7b01662] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Accepted: 01/24/2018] [Indexed: 05/20/2023]
Abstract
Mesoporous silica nanoparticles (MSNs) are drug delivery agents that are able to incorporate drugs within their pores. Furthermore, MSNs can be functionalized by attachment of bioactive ligands on their surface to enhance their activity, and nanoparticles modified with glycosaminoglycan (GAG) mimetics inhibit the entry of herpes simplex virus (HSV) into cells. In this study, structure-activity relationships of GAGs attached to MSNs were investigated in relation to HSV-1 and HSV-2, and acyclovir was loaded into the pores of MSNs. The sulfonate group was demonstrated to be essential for antiviral activity, which was enhanced by incorporating a benzene group within the ligand. Loading acyclovir into GAG mimetic-functionalized MSNs reduced the viral infection, resulting in nanoparticles that simultaneously target two distinct viral pathways, namely, inhibition of viral entry and inhibition of DNA replication.
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Affiliation(s)
- Edward
C. Lee
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Chau T. H. Nguyen
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Ekaterina Strounina
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Nicholas Davis-Poynter
- Centre
for Children’s Health Research, The
University of Queensland, 46 Graham Street, Brisbane, Queensland 4101, Australia
| | - Benjamin P. Ross
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
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Nguyen CTH, Webb RI, Lambert LK, Strounina E, Lee EC, Parat MO, McGuckin MA, Popat A, Cabot PJ, Ross BP. Bifunctional Succinylated ε-Polylysine-Coated Mesoporous Silica Nanoparticles for pH-Responsive and Intracellular Drug Delivery Targeting the Colon. ACS Appl Mater Interfaces 2017; 9:9470-9483. [PMID: 28252278 DOI: 10.1021/acsami.7b00411] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [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: 05/18/2023]
Abstract
Conventional oral drug formulations for colonic diseases require the administration of high doses of drug to achieve effective drug concentrations at the target site. However, this exposes patients to serious systemic toxicity in order to achieve efficacy. To overcome this problem, an oral drug delivery system was developed by loading a large amount (ca. 34% w/w) of prednisolone into 3-aminopropyl-functionalized mesoporous silica nanoparticles (MCM-NH2) and targeting prednisolone release to the colon by coating the nanoparticle with succinylated ε-polylysine (SPL). We demonstrate for the first time the pH-responsive ability of SPL as a "nanogate" to selectively release prednisolone in the pH conditions of the colon (pH 5.5-7.4) but not in the more acidic conditions of the stomach (pH 1.9) or small intestine (pH 5.0). In addition to targeting drug delivery to the colon, we explored whether the nanoparticles could deliver cargo intracellularly to immune cells (RAW 264.7 macrophages) and intestinal epithelial cells (LS 174T and Caco-2 adenocarcinoma cell lines). To trace uptake, MCM-NH2 were loaded with a cell membrane-impermeable dye, sulforhodamine B. The SPL-coated nanoparticles were able to deliver the dye intracellularly to RAW 264.7 macrophages and the intestinal epithelial cancer cells, which offers a highly promising and novel drug delivery system for diseases of the colon such as inflammatory bowel disease and colorectal cancer.
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Affiliation(s)
| | | | | | | | | | | | - Michael A McGuckin
- Translational Research Institute, Inflammatory Disease Biology and Therapeutics Group, Mater Research Institute - The University of Queensland , 37 Kent St., Woolloongabba, Queensland 4102, Australia
| | - Amirali Popat
- Translational Research Institute, Inflammatory Disease Biology and Therapeutics Group, Mater Research Institute - The University of Queensland , 37 Kent St., Woolloongabba, Queensland 4102, Australia
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Lee EC, Davis-Poynter N, Nguyen CTH, Peters AA, Monteith GR, Strounina E, Popat A, Ross BP. GAG mimetic functionalised solid and mesoporous silica nanoparticles as viral entry inhibitors of herpes simplex type 1 and type 2 viruses. Nanoscale 2016; 8:16192-6. [PMID: 27604476 DOI: 10.1039/c6nr03878f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A glycosaminoglycan mimetic was attached to the surface of solid and mesoporous silica nanoparticles to create novel antiviral agents against herpes simplex type 1 and type 2 viruses. The nanoparticles act as viral entry inhibitors that appear to block viral attachment and penetration into susceptible cells.
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Affiliation(s)
- Edward C Lee
- The University of Queensland, School of Pharmacy, Brisbane, QLD 4072, Australia.
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8
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Suresh M, Anand C, Frith JE, Dhawale DS, Subramaniam VP, Strounina E, Sathish CI, Yamaura K, Cooper-White JJ, Vinu A. Fluorescent and Magnetic Mesoporous Hybrid Material: A Chemical and Biological Nanosensor for Hg(2+) Ions. Sci Rep 2016; 6:21820. [PMID: 26911660 PMCID: PMC4766400 DOI: 10.1038/srep21820] [Citation(s) in RCA: 13] [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: 10/08/2015] [Accepted: 02/01/2016] [Indexed: 11/09/2022] Open
Abstract
We introduce “sense, track and separate” approach for the removal of Hg2+ ion from aqueous media using highly ordered and magnetic mesoporous ferrosilicate nanocages functionalised with rhodamine fluorophore derivative. These functionalised materials offer both fluorescent and magnetic properties in a single system which help not only to selectively sense the Hg2+ ions with a high precision but also adsorb and separate a significant amount of Hg2+ ion in aqueous media. We demonstrate that the magnetic affinity of these materials, generated from the ultrafine γ-Fe2O3 nanoparticles present inside the nanochannels of the support, can efficiently be used as a fluorescent tag to sense the Hg2+ ions present in NIH3T3 fibroblasts live cells and to track the movement of the cells by external magnetic field monitored using confocal fluorescence microscopy. This simple approach of introducing multiple functions in the magnetic mesoporous materials raise the prospect of creating new advanced functional materials by fusing organic, inorganic and biomolecules to create advanced hybrid nanoporous materials which have a potential use not only for sensing and the separation of toxic metal ions but also for cell tracking in bio-separation and the drug delivery.
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Affiliation(s)
- Moorthy Suresh
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia.,School of Chemistry and Molecular Biosciences (SCMB), The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Chokkalingam Anand
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Jessica E Frith
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Dattatray S Dhawale
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Vishnu P Subramaniam
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Ekaterina Strounina
- Centre for Advanced Imaging (CAI), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Clastinrusselraj I Sathish
- Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Kazunari Yamaura
- Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Justin J Cooper-White
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Ajayan Vinu
- Australian Institute for Bioengineering and Nanotechnology (AIBN), Cnr Cooper and College Rd, The University of Queensland, St. Lucia, Queensland 4072, Australia.,Future Industries Institute, University of South Australia, Mawson Lakes 5095, SA, Australia
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Lin R, Ge L, Hou L, Strounina E, Rudolph V, Zhu Z. Mixed matrix membranes with strengthened MOFs/polymer interfacial interaction and improved membrane performance. ACS Appl Mater Interfaces 2014; 6:5609-18. [PMID: 24669752 DOI: 10.1021/am500081e] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
MOFs-based mixed matrix membranes (MMMs) have attracted extensive attention in recent years due to their potential high separation performance, the low cost, and good mechanical properties. However, it is still very challenging to achieve defect-free interface between micrometer-sized MOFs and a polymer matrix. In this study, [Cd2L(H2O)]2·5H2O (Cd-6F) synthesized using 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) as an organic ligand was introduced into the 6FDA-ODA polyimide matrix to achieve novel MOF MMMs. A specific interfacial interaction between MOF crystals and polymer chains was innovatively targeted and achieved through in situ polymerization procedure. The enhanced adhesion between MOF particles and polymer phase was observed, and the improved interfacial interaction between Cd-6F and the 6FDA-ODA polyimide matrix was confirmed by detailed characterizations including FTIR and NMR. In the meantime, the gas permeance and selectivity of the MMMs are strongly dependent on their morphology. The MMM derived from in situ polymerization presents excellent interfaces between micrometer-sized MOF crystals and the polymer matrix, resulting in increased permeability and selectivity. The strategy shown here can be further utilized to select the MOF/polymer pair, eliminate interfacial voids, and improve membrane separation performance of MOFs-based MMMs.
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Affiliation(s)
- Rijia Lin
- School of Chemical Engineering, The University of Queensland , Brisbane, Queensland 4072, Australia
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10
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Hartono SB, Yu M, Gu W, Yang J, Strounina E, Wang X, Qiao S, Yu C. Synthesis of multi-functional large pore mesoporous silica nanoparticles as gene carriers. Nanotechnology 2014; 25:055701. [PMID: 24406311 DOI: 10.1088/0957-4484/25/5/055701] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The development of functional nanocarriers that can enhance the cellular delivery of a variety of nucleic acid agents is important in many biomedical applications such as siRNA therapy. We report the synthesis of large pore mesoporous silica nanoparticles (LPMSN) loaded with iron oxide and covalently modified by polyethyleneimine (denoted PEI-Fe-LPMSN) as carriers for gene delivery. The LPMSN have a particle size of ∼200 nm and a large pore size of 11 nm. The large pore size is essential for the formation of large iron oxide nanoparticles to increase the magnetic properties and the adsorption capacity of siRNA molecules. The magnetic property facilitates the cellular uptake of nanocarriers under an external magnetic field. PEI is covalently grafted on the silica surface to enhance the nanocarriers' affinity against siRNA molecules and to improve gene silencing performance. The PEI-Fe-LPMSN delivered siRNA-PLK1 effectively into osteosarcoma cancer cells, leading to cell viability inhibition of 80%, higher compared to the 50% reduction when the same dose of siRNA was delivered by a commercial product, oligofectamine.
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Affiliation(s)
- Sandy B Hartono
- ARC Centre of Excellence for Functional Nanomaterials, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, QLD 4072, Australia
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11
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Wang DK, Varanasi S, Strounina E, Hill DJT, Symons AL, Whittaker AK, Rasoul F. Synthesis and characterization of a POSS-PEG macromonomer and POSS-PEG-PLA hydrogels for periodontal applications. Biomacromolecules 2014; 15:666-79. [PMID: 24410405 DOI: 10.1021/bm401728p] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A novel water-soluble macromonomer based on octavinyl silsesquioxane has been synthesized and contains vinyl-terminated PEG 400 in each of the eight arms to promote water solubility. The macromonomer was characterized by NMR and FTIR and its aqueous solution properties examined. In water it exhibits an LCST with a cloud point at 23 °C for a 10 wt % aqueous solution. It is surface active with a CMC of 1.5 × 10(-5) M in water and in 20:80 v/v acetone/water the CMC is 7.1 × 10(-5) M, and TEM images showed spherical 22 nm aggregates in aqueous solution above the CMC. The macromonomer was copolymerized in a 20:80 v/v acetone/water mixture with a vinyl-terminated, triblock copolymer of lactide-PEG-lactide to form a library of cross-linked hydrogels that were designed for use as scaffolds for alveolar bone repair. The cross-linked copolymer networks were shown to contain a range of nm-μm sized pores and their swelling properties in water and PBS at pH 7.4 were examined. At pH 7.4 the hydrogel networks undergo a slow hydrolysis with the release of principally PEG and lactic acid fragments. The hydrogels were shown to be noncytotoxic toward fibroblast cultures at pH 7.4, both initially (days 1-5) and after significant hydrolysis had taken place (days 23-28).
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Affiliation(s)
- David K Wang
- Australian Institute for Bioengineering and Nanotechnology, ‡Centre for Advanced Imaging, ∥School of Chemistry and Molecular Biochemistry, and §School of Dentistry, The University of Queensland , Brisbane Queensland 4072, Australia
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12
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Liu L, Wang DK, Martens DL, Smart S, Strounina E, Diniz da Costa JC. Physicochemical characterisation and hydrothermal stability investigation of cobalt-incorporated silica xerogels. RSC Adv 2014. [DOI: 10.1039/c4ra00498a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
High cobalt oxide concentrations were able to shield the microporous silica network from excessive structural rearrangement during harsh hydrothermal testing.
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Affiliation(s)
- Liang Liu
- The University of Queensland
- FIMLab – Films and Inorganic Membrane Laboratory
- School of Chemical Engineering
- Brisbane, Australia
- Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC)
| | - David K. Wang
- The University of Queensland
- FIMLab – Films and Inorganic Membrane Laboratory
- School of Chemical Engineering
- Brisbane, Australia
| | - Dana. L. Martens
- The University of Queensland
- FIMLab – Films and Inorganic Membrane Laboratory
- School of Chemical Engineering
- Brisbane, Australia
- Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC)
| | - Simon Smart
- The University of Queensland
- FIMLab – Films and Inorganic Membrane Laboratory
- School of Chemical Engineering
- Brisbane, Australia
- Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC)
| | | | - João C. Diniz da Costa
- The University of Queensland
- FIMLab – Films and Inorganic Membrane Laboratory
- School of Chemical Engineering
- Brisbane, Australia
- Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC)
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Andriani Y, Jack KS, Gilbert EP, Edwards GA, Schiller TL, Strounina E, Osman AF, Martin DJ. Organization of mixed dimethyldioctadecylammonium and choline modifiers on the surface of synthetic hectorite. J Colloid Interface Sci 2013; 409:72-9. [DOI: 10.1016/j.jcis.2013.07.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 07/21/2013] [Indexed: 10/26/2022]
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Kealley CS, Rout MK, Dezfouli MR, Strounina E, Whittaker AK, Appelqvist IAM, Lillford PJ, Gilbert EP, Gidley MJ. Structure and molecular mobility of soy glycinin in the solid state. Biomacromolecules 2008; 9:2937-46. [PMID: 18808181 DOI: 10.1021/bm800721d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a multitechnique study of structural organization and molecular mobility for soy glycinin at a low moisture content (<30% w/w) and relate these to its glass-to-rubber transition. Small-angle X-ray scattering (SAXS), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy are used to probe structure and mobility on different length and time scales. NMR (approximately 10(-6) to 10(-3) s) reveals transitions at a higher moisture content (>17%) than DSC or SAXS, which sample for much longer times (approximately 10 to 10(3) s) and where changes are detected at >13% water content at 20 degrees C. The mobility transitions are accompanied by small changes in unit-cell parameters and IR band intensities and are associated with the enhanced motion of the polypeptide backbone. This study shows how characteristic features of the ordered regions of the protein (probed by SAXS and FTIR) and mobile segments (probed by NMR and DSC) can be separately monitored and integrated within a mobility transformation framework.
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Affiliation(s)
- Catherine S Kealley
- Bragg Institute, Australian Nuclear Science and Technology Organization, PMB 1, Menai, NSW 2234 Australia
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Russo MAL, Strounina E, Waret M, Nicholson T, Truss R, Halley PJ. A Study of Water Diffusion into a High-Amylose Starch Blend: The Effect of Moisture Content and Temperature. Biomacromolecules 2006; 8:296-301. [PMID: 17206820 DOI: 10.1021/bm060791i] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of moisture content and temperature on water diffusion into a modified high amylose (< or = 90%) maize thermoplastic starch blend was investigated. Gravimetric and magnetic resonance imaging (MRI) studies were conducted to elucidate the diffusion mechanism and diffusion coefficients for this system. The diffusion coefficient data demonstrated that the rate of water diffusion into this blend was significantly dependent upon temperature and moisture content. Water diffusion was faster at higher temperatures and generally for samples stored at higher relative humidity environments. It was revealed from the gravimetric data that water diffusion into this starch blend was Fickian; however, further analysis of the MRI images found that the water diffusion mechanism was exponentially dependent on the concentration. This result was determined by comparing experimental water concentration profiles to a theoretical model calculated using the implicit Crank-Nicolson finite difference method.
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Affiliation(s)
- Melissa A L Russo
- The Centre for High Performance Polymers, University of Queensland, Brisbane, Australia, 4072.
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