51
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The self-crosslinked ufasome of conjugated linoleic acid: Investigation of morphology, bilayer membrane and stability. Colloids Surf B Biointerfaces 2014; 123:8-14. [DOI: 10.1016/j.colsurfb.2014.08.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 08/05/2014] [Accepted: 08/22/2014] [Indexed: 01/01/2023]
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52
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Aptamer-functionalized porous phospholipid nanoshells for direct measurement of Hg(2+) in urine. Anal Bioanal Chem 2014; 407:953-60. [PMID: 25326888 DOI: 10.1007/s00216-014-8246-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/08/2014] [Accepted: 10/07/2014] [Indexed: 10/24/2022]
Abstract
A porous phospholipid nanoshell (PPN) sensor functionalized with a specific aptamer sensor agent was prepared for rapid detection of Hg(2+) in human urine with minimal sample preparation. Aptamer sensors provide an important class of optical transducers that can be readily and reproducibly synthesized. A key limitation of aptamer sensors, and many other optical sensors, is the potential of biofouling or biodegradation when used in complex biological matrices such as serum or urine, particularly when high levels of nucleases are present. We prepared Hg(2+)-responsive, PPN-encapsulated aptamer sensors that overcome these limitations. PPNs provide a protective barrier to encapsulate the aptamer sensor in an aqueous environment free of diffusional restrictions encountered with many polymer nanomaterials. The unique porous properties of the PPN membrane enable ready and rapid transfer of small molecular weight ions and molecules into the sensor interior while minimizing the macromolecular interactions between the transducer and degradants or interferents in the exterior milieu. Using Hg(2+)-responsive, PPN-encapsulated aptamer sensors, we were able to detect sub-100 ppb (chronic threshold limit from urine test) Hg(2+) in human urine with no sample preparation, whereas free aptamer sensors yielded inaccurate results due to interferences from the matrix. The PPN architecture provides a new platform for construction of aptamer-functionalized sensors that target low molecular weight species in complex matrices, beyond the Hg(2+) demonstrated here.
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53
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Mitra AK, Ghosh S, Sarangi MK, Chakraborty S, Saha C, Basu S. Photophysics of a solvent sensitive keto-tetrahydrocarbazole based fluorophore and its interaction with triethylamine: A spectroscopic inquest under surfactant and β-CD confinement. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.06.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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54
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Hou X, Wang Z, Lee J, Wysocki E, Oian C, Schlak J, Chu QR. Synthesis of polymeric ladders by topochemical polymerization. Chem Commun (Camb) 2014; 50:1218-20. [PMID: 24336342 DOI: 10.1039/c3cc47379a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two polymeric ladders were synthesized by topochemical polymerization. The critical assemblies with multiple reactive centers were characterized by single crystal X-ray diffraction. Approximately 64% and 70% of the mass of the two polymeric ladders can be derived from biomass, respectively.
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Affiliation(s)
- Xiaodong Hou
- Department of Chemistry, University of North Dakota, Grand Forks, ND 58202, USA.
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55
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Kore R, Srivastava R, Satpati B. ZSM-5 zeolite nanosheets with improved catalytic activity synthesized using a new class of structure-directing agents. Chemistry 2014; 20:11511-21. [PMID: 25056112 DOI: 10.1002/chem.201402665] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Indexed: 12/27/2022]
Abstract
A new series of multiquaternary ammonium structure-directing agents, based on 1,4-diazabicyclo[2.2.2]octane, was prepared. ZSM-5 zeolites with nanosheet morphology (10 nm crystal thickness) were synthesized under hydrothermal conditions using multiquaternary ammonium surfactants as the zeolite structure-generating agents. Both wide-angle and small-angle diffraction patterns were obtained using only a suitable structure-directing agent under a specific zeolite synthesis composition. A mechanism of zeolite formation is proposed based on the results obtained from various physicochemical characterizations. ZSM-5 materials were investigated in catalytic reactions requiring medium to strong acidity, which are important for the synthesis of a wide range of industrially important fine and specialty chemicals. The catalytic activity of ZSM-5 materials was compared with that of the conventional ZSM-5 and amorphous mesoporous aluminosilicate Al-MCM-41. The synthesis strategy of the present investigation using the new series of structure-directing agents could be extended for the synthesis of other related zeolites or other porous materials in the future. Zeolite with a structural feature as small as the size of a unit cell (5-10 nm) with hierarchically ordered porous structure would be very promising for catalysis.
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Affiliation(s)
- Rajkumar Kore
- Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab (India), Fax: (+91) 1881-223395
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56
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Harano K, Narita A, Nakamura E. Photocrosslinking of the Exterior of a Fullerene Bilayer that Prevents Vesicle Aggregation. CHEM LETT 2014. [DOI: 10.1246/cl.140143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Koji Harano
- Department of Chemistry, The University of Tokyo
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57
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Hao F, Tahara K, Kikuchi JI. A Synthetic Cell Division System: Effect of Nonbilayer-forming Lipid on Division of Liposomal Membranes. CHEM LETT 2014. [DOI: 10.1246/cl.140081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Fei Hao
- Graduate School of Materials Science, Nara Institute of Science and Technology
| | - Keishiro Tahara
- Graduate School of Materials Science, Nara Institute of Science and Technology
| | - Jun-ichi Kikuchi
- Graduate School of Materials Science, Nara Institute of Science and Technology
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58
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59
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Wang L, Zou H, Dong Z, Zhou L, Li J, Luo Q, Zhu J, Xu J, Liu J. Temperature-driven switching of the catalytic activity of artificial glutathione peroxidase by the shape transition between the nanotubes and vesicle-like structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4013-4018. [PMID: 24654792 DOI: 10.1021/la5008236] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Smart supramolecular nanoenzymes with temperature-driven switching property have been successfully constructed by the self-assembly of supra-amphiphiles formed by the cyclodextrin-based host-guest chemistry. The self-assembled nanostructures were catalyst-functionalized and thermosensitively-functionalized through conveniently linking the catalytic center of glutathione peroxidase and thermosensitive polymer to the host cyclodextrin molecules.The ON-OFF switches for the peroxidase activity by reversible transformation of nanostructures from tube to sphere have been achieved through changing the temperature. We anticipate that such intelligent enzyme mimics could be developed to use in an antioxidant medicine with controlled catalytic efficiency according to the needs of the human body in the future.
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Affiliation(s)
- Liang Wang
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry, Jilin University , 2699 Qianjin Road, Changchun 130012, P. R. China
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60
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Chien CC, Liu JH. Optical Behaviors of Flexible Photonic Films via the Developed Multiple UV-Exposed Fabrications. Macromol Rapid Commun 2014; 35:1185-90. [DOI: 10.1002/marc.201400009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 03/03/2014] [Indexed: 12/26/2022]
Affiliation(s)
- Chih-Chieh Chien
- Department of Chemical Engineering; National Cheng Kung University; Tainan 70101 Taiwan
| | - Jui-Hsiang Liu
- Department of Chemical Engineering; National Cheng Kung University; Tainan 70101 Taiwan
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61
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Gallagher ES, Mansfield E, Aspinwall CA. Stabilized phospholipid membranes in chromatography: toward membrane protein-functionalized stationary phases. Anal Bioanal Chem 2014; 406:2223-9. [PMID: 24390459 PMCID: PMC3969766 DOI: 10.1007/s00216-013-7545-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 12/02/2013] [Indexed: 10/25/2022]
Abstract
Transmembrane protein (TMP)-functionalized materials have resulted in powerful new methods in chemical analysis. Of particular interest is the development of high-throughput, TMP-functionalized stationary phases for affinity chromatography of complex mixtures of analytes. Several natural and synthetic phospholipids and lipid mimics have been used for TMP reconstitution, although the resulting membranes often lack the requisite chemical and temporal stability for long-term use, a problem that is exacerbated in flowing separation systems. Polymerizable lipids with markedly increased membrane stability and TMP functionality have been developed over the past two decades. More recently, these lipids have been incorporated into a range of analytical methods, including separation techniques, and are now poised to have a significant impact on TMP-based separations. Here, we describe current methods for preparing TMP-containing stationary phases and examine the potential utility of polymerizable lipids in TMP affinity chromatography.
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Affiliation(s)
- Elyssia S. Gallagher
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721, USA
| | - Elisabeth Mansfield
- National Institute of Standards and Technology, Applied Chemicals and Materials Division, Boulder, Colorado, 80305, USA
| | - Craig A. Aspinwall
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721, USA
- BIO5 Institute, University of Arizona, 1306 E. University Blvd, Tucson, Arizona, 85721, USA
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62
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Feng A, Yuan J. Smart Nanocontainers: Progress on Novel Stimuli-Responsive Polymer Vesicles. Macromol Rapid Commun 2014; 35:767-79. [DOI: 10.1002/marc.201300866] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 12/23/2013] [Indexed: 01/15/2023]
Affiliation(s)
- Anchao Feng
- Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University; Beijing 100084 P. R. China
| | - Jinying Yuan
- Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University; Beijing 100084 P. R. China
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63
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Kang B, Choi SJ. Preparation of stabilized magnetic nanoparticles with polymerizable lipid and anchor compounds. Anal Biochem 2014; 446:87-9. [PMID: 24215908 DOI: 10.1016/j.ab.2013.10.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 09/28/2013] [Accepted: 10/30/2013] [Indexed: 11/26/2022]
Abstract
Although the lipid-based method for coating of magnetic nanoparticles (MNPs) is rapid and simple, the unstable state of the lipid layer is a major limitation for the practical application of this method. We devised a method to prepare stabilized MNPs by covalent modifications such as lipid polymerization and anchoring of the lipid layer. The stability of the modified lipid layer was demonstrated by the stable status of enzymes immobilized on the MNPs and the resistance of the MNPs to aggregation. We also determined the maximum ratio of nonpolymerizable lipophilic compounds that can be included in the layer without significantly reducing stability.
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Affiliation(s)
- Boram Kang
- Department of Chemistry, Gangneung-Wonju National University, Gangneung 210-702, Republic of Korea
| | - Suk-Jung Choi
- Department of Chemistry, Gangneung-Wonju National University, Gangneung 210-702, Republic of Korea.
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64
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Bright LK, Baker CA, Agasid MT, Ma L, Aspinwall CA. Decreased aperture surface energy enhances electrical, mechanical, and temporal stability of suspended lipid membranes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:11918-26. [PMID: 24187929 PMCID: PMC3909927 DOI: 10.1021/am403605h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The development of next-generation transmembrane protein-based biosensors relies heavily on the use of black lipid membranes (BLMs); however, electrical, mechanical, and temporal instability of BLMs poses a limiting challenge to biosensor development. In this work, micrometer-sized glass apertures were modified with silanes of different chain length and fluorine composition, including 3-cyanopropyldimethychlorosilane (CPDCS), ethyldimethylchlorosilane (EDCS), n-octyldimethylchlorosilane (ODCS), (tridecafluoro-1, 1, 2, 2-tetrahydrooctyl)dimethylchlorosilane (PFDCS), or (heptadecafluoro-1,1,2,2-tetrahydrodecyl)dimethylchlorosilane (PFDDCS), to explore the effect of substrate surface energy on BLM stability. Low energy silane-modified surfaces promoted enhanced lipid-substrate interactions that facilitate the formation of low-leakage, stable BLMs. The surface energies of silane-modified substrates were 30 ± 3, 16 ± 1, 14 ± 2, 11 ± 1, and 7.1 ± 2 mJ m(-2) for CDCS, EDCS, ODCS, PFDCS, and PFDDCS, respectively. Decreased surface energy directly correlated to improved electrical, mechanical, and temporal BLM stability. Amphiphobic perfluorinated surface modifiers yielded superior performance compared to traditional hydrocarbon modifiers in terms of stability and BLM formation, with only marginal effects on BLM membrane permeability. Leakage currents obtained for PFDCS and PFDDCS BLMs were elevated only 10-30%, though PFDDCS modification yielded >5-fold increase in electrical stability as indicated by breakdown voltage (> 2000 mV vs 418 ± 73 mV), and >25-fold increase in mechanical stability as indicated by air-water transfers (> 50 vs 2 ± 0.2) when compared to previously reported CPDCS modification. Importantly, the dramatically improved membrane stabilities were achieved with no deleterious effects on reconstituted ion channel function, as evidenced by α-hemolysin activity. Thus, this approach provides a simple, low cost, and broadly applicable alternative for BLM stabilization and should contribute significantly toward the development of next-generation ion-channel-functionalized biosensors.
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Affiliation(s)
- Leonard K. Bright
- Department of Chemistry and Biochemistry University of Arizona, Tucson, AZ 85721
| | - Christopher A. Baker
- Department of Chemistry and Biochemistry University of Arizona, Tucson, AZ 85721
| | - Mark T. Agasid
- Department of Chemistry and Biochemistry University of Arizona, Tucson, AZ 85721
| | - Lin Ma
- Department of Chemistry and Biochemistry University of Arizona, Tucson, AZ 85721
| | - Craig A. Aspinwall
- Department of Chemistry and Biochemistry University of Arizona, Tucson, AZ 85721
- BIO5 Institute, University of Arizona, Tucson, AZ 85721
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65
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Zhou Q, Gao D, Liu J, Sun X, Zhang L, Qi B, Zhang H, Xia C, Zhou X. Transformation of micelles into supramolecular vesicles triggered by the formation of [4]pseudorotaxanes. J Colloid Interface Sci 2013; 410:131-9. [DOI: 10.1016/j.jcis.2013.08.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 08/08/2013] [Accepted: 08/09/2013] [Indexed: 12/28/2022]
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66
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Harano K, Narita A, Nakamura E. Photocrosslinking of Fullerene Vesicles that Prevents Phase Transition and Decreases Water Permeation. CHEM LETT 2013. [DOI: 10.1246/cl.130505] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Koji Harano
- Department of Chemistry, The University of Tokyo
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67
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Paul BK, Ray D, Ganguly A, Guchhait N. Modulation in prototropism of the photosensitizer Harmane by host:guest interactions between β-cyclodextrin and surfactants. J Colloid Interface Sci 2013; 411:230-9. [PMID: 24060109 DOI: 10.1016/j.jcis.2013.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 08/01/2013] [Accepted: 08/02/2013] [Indexed: 11/25/2022]
Abstract
The present contribution demonstrates the photophysics of a prospective cancer cell photosensitizer Harmane (HM) belonging to the family of β-carboline in mixed microheterogeneous environments of β-cyclodextrin (β-CD) and surfactants having varying surface charges using steady-state and time-resolved fluorescence spectroscopic techniques. The remarkable modulations in prototropic activities of the micelle-bound drug in the presence of β-CD evinces for disruption of the micellar structural integrity by β-CD. The results are meticulously discussed in relevance to the effect of a potential drug delivery vehicle (CD) on the membrane-mimetic micellar system. Further, application of an extrinsic fluorescence probe for monitoring such interactions is fraught by the possibilities of no less than three equilibria that can operate simultaneously viz., (i) surfactant-cyclodextrin, (ii) surfactant-fluorophore and (iii) cyclodextrin-fluorophore. This aspect highlights the enormous importance of the issue of suitability of the fluorescence probe to study such complicated systems and interaction phenomena. Also the varying interaction scenario of β-CD with the nature of the surfactant highlights the importance of precise knowledge of the strength and locus of drug binding in delineating such complex interactions. The results of the present investigation advocate for the potential applicability of the drug (HM) itself as a fluorescence reporter in study of such complex microheterogeneous interactions.
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Affiliation(s)
- Bijan K Paul
- Department of Chemistry, University of Calcutta, 92 A.P.C. Road, Calcutta 700 009, India
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68
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Patil AJ, Li M, Mann S. Integrative self-assembly of functional hybrid nanoconstructs by inorganic wrapping of single biomolecules, biomolecule arrays and organic supramolecular assemblies. NANOSCALE 2013; 5:7161-7174. [PMID: 23824335 DOI: 10.1039/c3nr02796a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Synthesis of functional hybrid nanoscale objects has been a core focus of the rapidly progressing field of nanomaterials science. In particular, there has been significant interest in the integration of evolutionally optimized biological systems such as proteins, DNA, virus particles and cells with functional inorganic building blocks to construct mesoscopic architectures and nanostructured materials. However, in many cases the fragile nature of the biomolecules seriously constrains their potential applications. As a consequence, there is an on-going quest for the development of novel strategies to modulate the thermal and chemical stabilities, and performance of biomolecules under adverse conditions. This feature article highlights new methods of "inorganic molecular wrapping" of single or multiple protein molecules, individual double-stranded DNA helices, lipid bilayer vesicles and self-assembled organic dye superstructures using inorganic building blocks to produce bio-inorganic nanoconstructs with core-shell type structures. We show that spatial isolation of the functional biological nanostructures as "armour-plated" enzyme molecules or polynucleotide strands not only maintains their intact structure and biochemical properties, but also enables the fabrication of novel hybrid nanomaterials for potential applications in diverse areas of bionanotechnology.
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Affiliation(s)
- Avinash J Patil
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Cantocks Close, BS8 1TS, UK.
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69
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70
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Dong J, Xun Z, Zeng Y, Yu T, Han Y, Chen J, Li YY, Yang G, Li Y. A versatile and robust vesicle based on a photocleavable surfactant for two-photon-tuned release. Chemistry 2013; 19:7931-6. [PMID: 23589382 DOI: 10.1002/chem.201300526] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2013] [Indexed: 02/05/2023]
Abstract
A small amphiphile that contains a coumarin unit and alkynyl groups, as a two-photon-cleavable segment and polymerizable groups, respectively, was designed and synthesized. The amphiphile showed a critical aggregation concentration of about 4.6×10(-5) M and formed a vesicle-type assembly. The formed vesicles were stabilized by in situ "click" polymerization without altering their morphology. Hydrophobic and hydrophilic guests can be encapsulated within the vesicle membrane and inside the aqueous core of the vesicle, respectively. The loaded guests can be released from the vesicle by using UV or near-IR stimuli, through splitting up the amphiphilic structure of the amphiphile. Distinguished dose-controlled photorelease of the polymeric vesicle is achieved with the maintenance of vesicular integrity, which makes the guest release dependent on the amount of cleavage of the amphiphilic structure during irradiation. This study provides a potential strategy for the development of versatile and stable drug-delivery systems that offer sustained and photo-triggered release.
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Affiliation(s)
- Jianming Dong
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
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71
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Morigaki K, Mizutani K, Saito M, Okazaki T, Nakajima Y, Tatsu Y, Imaishi H. Surface functionalization of a polymeric lipid bilayer for coupling a model biological membrane with molecules, cells, and microstructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2722-2730. [PMID: 23347422 DOI: 10.1021/la304747e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We describe a stable and functional model biological membrane based on a polymerized lipid bilayer with a chemically modified surface. A polymerized lipid bilayer was formed from a mixture of two diacetylene-containing phospholipids, 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DiynePC) and 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphoethanolamine (DiynePE). DiynePC formed a stable bilayer structure, whereas the ethanolamine headgroup of DiynePE enabled functional molecules to be grafted onto the membrane surface. Copolymerization of DiynePC and DiynePE resulted in a robust bilayer. Functionalization of the polymeric bilayer provided a route to a robust and biomimetic surface that can be linked with biomolecules, cells, and three-dimensional (3D) microstructures. Biotin and peptides were grafted onto the polymeric bilayer for attaching streptavidin and cultured mammalian cells by molecular recognition, respectively. Nonspecific adsorption of proteins and cells on polymeric bilayers was minimum. DiynePE was also used to attach a microstructure made of an elastomer (polydimethylsiloxan: PDMS) onto the membrane, forming a confined aqueous solution between the two surfaces. The microcompartment enabled us to assay the activity of a membrane-bound enzyme (cyochrome P450). Natural (fluid) lipid bilayers were incorporated together with membrane-bound proteins by lithographically polymerizing DiynePC/DiynePE bilayers. The hybrid membrane of functionalized polymeric bilayers and fluid bilayers offers a novel platform for a wide range of biomedical applications including biosensor, bioassay, cell culture, and cell-based assay.
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Affiliation(s)
- Kenichi Morigaki
- Research Center for Environmental Genomics, Kobe University, Rokkodaicho 1-1, Nada, Kobe 657-8501, Japan.
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72
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Practical considerations for preparing polymerized phospholipid bilayer capillary coatings for protein separations. Anal Chim Acta 2013; 772:93-8. [PMID: 23540253 DOI: 10.1016/j.aca.2013.02.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 11/27/2012] [Accepted: 02/14/2013] [Indexed: 11/21/2022]
Abstract
Phosphorylcholine (PC) based phospholipid bilayers have proven useful as capillary coating materials due to their inherent resistance to non-specific protein adsorption. The primary limitation of this important class of capillary coatings remains the limited long-term chemical and physical stability of the coatings. Recently, a method for increasing phospholipid coating stability in fused silica capillaries via utilization of polymerized, synthetic phospholipids was reported. Here, we expand upon these studies by investigating polymerized lipid bilayer capillary coatings with respect to separation performance including run-to-run, day-to-day and column-to-column reproducibility and long-term stability. In addition, the effects of pH and capillary inner diameter on polymerized phospholipid coated capillaries were investigated to identify optimized coating conditions. The coatings are stabilized for protein separations across a wide range of pH values (4.0-9.3), a unique property for capillary coating materials. Additionally, smaller inner diameter capillaries (≤50 μm) were found to yield marked enhancements in coating stability and reproducibility compared to wider bore capillaries, demonstrating the importance of capillary size for separations employing polymerized phospholipid coatings.
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73
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Ni R, Childers WS, Hardcastle KI, Mehta AK, Lynn DG. Remodeling cross-β nanotube surfaces with peptide/lipid chimeras. Angew Chem Int Ed Engl 2013; 51:6635-8. [PMID: 22736642 DOI: 10.1002/anie.201201173] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rong Ni
- Center for Fundamental and Applied Molecular Evolution, NSF/NASA Center for Chemical Evolution, and Department of Chemistry, Emory University, Atlanta, GA 30322, USA
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74
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Sadasivam M, Avci P, Gupta GK, Lakshmanan S, Chandran R, Huang YY, Kumar R, Hamblin MR. Self-assembled liposomal nanoparticles in photodynamic therapy. EUROPEAN JOURNAL OF NANOMEDICINE 2013; 5. [PMID: 24348377 DOI: 10.1515/ejnm-2013-0010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Photodynamic therapy (PDT) employs the combination of non-toxic photosensitizers (PS) together with harmless visible light of the appropriate wavelength to produce reactive oxygen species that kill unwanted cells. Because many PS are hydrophobic molecules prone to aggregation, numerous drug delivery vehicles have been tested to solubilize these molecules, render them biocompatible and enhance the ease of administration after intravenous injection. The recent rise in nanotechnology has markedly expanded the range of these nanoparticulate delivery vehicles beyond the well-established liposomes and micelles. Self-assembled nanoparticles are formed by judicious choice of monomer building blocks that spontaneously form a well-oriented 3-dimensional structure that incorporates the PS when subjected to the appropriate conditions. This self-assembly process is governed by a subtle interplay of forces on the molecular level. This review will cover the state of the art in the preparation and use of self-assembled liposomal nanoparticles within the context of PDT.
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Affiliation(s)
- Magesh Sadasivam
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA
| | - Pinar Avci
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA; Department of Dermatology, Harvard Medical School, Boston, MA, USA; and Department of Dermatology, Dermatooncology and Venerology, Semmelweis University School of Medicine, Budapest, Hungary
| | - Gaurav K Gupta
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA; and Department of Dermatology, Harvard Medical School, Boston, MA, USA
| | | | - Rakkiyappan Chandran
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA
| | - Ying-Ying Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA; Department of Dermatology, Harvard Medical School, Boston, MA, USA; and Pathology Department, Guangxi Medical University, Nanning, Guangxi, China
| | - Raj Kumar
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA; and Department of Dermatology, Harvard Medical School, Boston, MA, USA
| | - Michael R Hamblin
- Department of Dermatology, Harvard Medical School, Boston, MA, USA; and Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, USA
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75
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76
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Polymerized phospholipid bilayers as permanent coatings for small amine separations using mixed aqueous/organic capillary zone electrophoresis. J Chromatogr A 2012; 1267:80-8. [DOI: 10.1016/j.chroma.2012.07.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 07/05/2012] [Accepted: 07/06/2012] [Indexed: 11/24/2022]
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77
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Studies of mixed liposomes with novel sorbyl functionalized head group lipids. Chem Phys Lipids 2012; 165:809-17. [PMID: 23127336 DOI: 10.1016/j.chemphyslip.2012.10.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2012] [Revised: 09/30/2012] [Accepted: 10/22/2012] [Indexed: 11/23/2022]
Abstract
Three novel polymerizable amphiphiles with a sorbyl-substituted head group were synthesized and systematically characterized. These amphiphiles are neutral in charge. None of these molecules forms vesicles by itself, presumably due to lack of amphiphilicity and/or extensive head group interaction. Therefore, mixed vesicles were formed with other fluid lipids such as DPenPC, eggPC, or DOPC. We investigated the properties of these mixtures in both vesicles and Langmuir films. The Langmuir isotherms show formation of monolayers by all three molecules. However, the isotherms for mixed monolayers suggest that two components are largely immiscible to the mixing lipid. Under polymerization conditions, mixed vesicles of these amphiphiles form oligomers, suggesting that in spite of a larger head group, they form mesophases.
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78
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New sorbic-type quaternary ammonium single-chain and gemini polymerizable surfactants: Synthesis, interfacial properties and anti-electrostatic activity. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.03.060] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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79
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Li J, Zhou L, Luo Q, Wang Y, Zhang C, Lu W, Xu J, Liu J. Cucurbit[7]uril-Based Vesicles Formed by Self-assembly of Supramolecular Amphiphiles. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200603] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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80
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Ni R, Childers WS, Hardcastle KI, Mehta AK, Lynn DG. Remodeling Cross-β Nanotube Surfaces with Peptide/Lipid Chimeras. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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81
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Guo DS, Wang K, Wang YX, Liu Y. Cholinesterase-Responsive Supramolecular Vesicle. J Am Chem Soc 2012; 134:10244-50. [DOI: 10.1021/ja303280r] [Citation(s) in RCA: 360] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Dong-Sheng Guo
- Department of Chemistry, State Key Laboratory
of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071,
People's Republic of China
| | - Kui Wang
- Department of Chemistry, State Key Laboratory
of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071,
People's Republic of China
| | - Yi-Xuan Wang
- Department of Chemistry, State Key Laboratory
of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071,
People's Republic of China
| | - Yu Liu
- Department of Chemistry, State Key Laboratory
of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071,
People's Republic of China
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82
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Punnamaraju S, You H, Steckl AJ. Triggered release of molecules across droplet interface bilayer lipid membranes using photopolymerizable lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7657-64. [PMID: 22548362 DOI: 10.1021/la3011663] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A combination of nonpolymerizable phospholipids (DPPC or DPhPC) and a smaller amount of cross-linking photopolymerizable phospholipids (23:2 DiynePC) is incorporated in an unsupported artificial lipid bilayer formed using the droplet interface bilayer (DIB) approach. The DIB is formed by contacting lipid monolayer-coated aqueous droplets against each other in a dodecane-lipid medium. Cross-linking of the photopolymerizable lipids incorporated in the DIB was obtained by exposure to UV-C radiation (254 nm), resulting in pore formation. The effect of cross-linking on the DIB properties was characterized optically by measuring the diffusion of selectively encapsulated dye molecules (calcein) from one droplet of the DIB to the other droplet. Changes in DIB conductivity due to UV-C exposure were investigated using current-voltage (I-V) measurements. The leakage of dye molecules across the DIB and the increase in DIB conductivity after UV-C exposure indicates the formation of membrane pores. The results indicate that the DIB approach offers a simple and flexible platform for studying phototriggered drug delivery systems in vitro.
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Affiliation(s)
- S Punnamaraju
- Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221, USA
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83
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Li MH, Yang WL, Qian J, Wang CC, Fu SK. Polymerization of lyotropic phases: 1. Isotropic fluid phase of two new polymerizable amphiphiles. Des Monomers Polym 2012. [DOI: 10.1163/1568555042474077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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84
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Krishna OD, Jeon OC, Kim K, Byun Y, Moon HT. Drug Release from a Chemically-Anchored PEG/Phospholipid Monolayer onto Polymer-Coated Metallic Stents. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 21:789-802. [DOI: 10.1163/156856209x445294] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Ohm Divyam Krishna
- a College of Pharmacy, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, South Korea
| | - Ok Cheol Jeon
- b Mediplex Corporation, 1204 ACE High-End Tower, 235-2, Guro-3-dong, Guro-gu, Seoul 152-711, South Korea; Department of Textile Engineering, Kyung Hee University, 1, Seocheon-dong, Yongin-si, Gyeonggi-do 449-701, South Korea
| | - Kwangmeyung Kim
- c Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea
| | - Youngro Byun
- d College of Pharmacy, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, South Korea
| | - Hyun Tae Moon
- e Mediplex Corporation, 1204 ACE High-End Tower, 235-2, Guro-3-dong, Guro-gu, Seoul 152-711, South Korea.
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85
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86
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Nanoporous polymer materials based on self-organized, bicontinuous cubic lyotropic liquid crystal assemblies and their applications. Polym J 2012. [DOI: 10.1038/pj.2012.15] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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87
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Ishihara Y, Kimura S. Peptide nanotube composed of cyclic tetra-β-peptide having polydiacetylene. Biopolymers 2012; 98:155-60. [DOI: 10.1002/bip.22029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 01/19/2012] [Accepted: 01/26/2012] [Indexed: 12/19/2022]
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88
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Dong J, Zeng Y, Xun Z, Han Y, Chen J, Li YY, Li Y. Stabilized vesicles consisting of small amphiphiles for stepwise photorelease via UV light. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1733-1737. [PMID: 22172224 DOI: 10.1021/la203829d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A small amphiphile consisting of hydrophilic tetraethylene glycol monoacrylate and hydrophobic alkyl chain which were connected by an o-nitrobenzyl unit, a photolabile group, was designed and synthesized. The critical aggregate concentration of the synthesized amphiphile was determined to be about 3 × 10(-5) M by the fluorescence probe technique. Nanosized vesicles were prepared and stabilized by in-situ radical polymerization without altering the morphology. The polymeric vesicle was highly stable which retained vesicular shape under dilution or UV irradiation. Hydrophobic guests can be encapsulated within the vesicle membrane and released out of the vesicle by UV stimulus through splitting the amphiphilic structure of the amphiphile. Distinguished dose-controlled photorelease of the polymeric vesicle is achieved due to the maintenance of the vesicular shape integrity which makes the guest release depend on the cleavage amount of amphiphilic structure during UV irradiation. This study provides a promising strategy to develop stable drug delivery systems for sustained and phototriggered release.
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Affiliation(s)
- Jianming Dong
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
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89
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Lovell JF, Jin CS, Huynh E, MacDonald TD, Cao W, Zheng G. Enzymatic Regioselection for the Synthesis and Biodegradation of Porphysome Nanovesicles. Angew Chem Int Ed Engl 2012; 51:2429-33. [DOI: 10.1002/anie.201108280] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 12/15/2011] [Indexed: 11/06/2022]
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90
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Lovell JF, Jin CS, Huynh E, MacDonald TD, Cao W, Zheng G. Enzymatic Regioselection for the Synthesis and Biodegradation of Porphysome Nanovesicles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108280] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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91
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Abstract
Materials with the ability of dimensional changes on demand exhibit many potential applications ranging from adaptive composites that mimic biological functions under extreme conditions to microfluidics or neural implants to stimulate components of the nervous systems. These studies show the synthesis of temperature-induced reversibly expandable nanotubes that were prepared by polymerization of N-isopropylacrylamide (NIPAAM) in the presence of biologically active 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC8,9PC) diacetylenic phospholipids (PL). As a result, thermally responsive poly-NIPAM-phospholipid nanotubes (PNNTs) were prepared. Polymerization reactions occur within hydrophilic regions of PL bilayers, whereas PL hydrophobic zones facilitate transport and supply of the monomer for polymerization. The unique feature of PNNTs is that, above 37 °C, the outer diameter (OD) as well as the wall thickness (WT) shrink by 20 and 55%, respectively, whereas the inner diameter (ID) increases by ∼16%. This behavior is attributed to the PNIPAM backbone buckling induced by local rearrangements within PL bilayered morphologies. The presence of acetylenic moieties along the PL bilayers in PNNTs provides an opportunity for irreversible "locking" of designable dimensions, which is facilitated by the formation of cross-linked PNNTs (CL-PNNTs).
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Affiliation(s)
- Shintaro Kawano
- School of Polymers and High Performance Materials,
Shelby F. Thames Polymer Science Research Center, The University of Southern Mississippi, Hattiesburg, Mississippi
39406, United States
| | - Marek W. Urban
- School of Polymers and High Performance Materials,
Shelby F. Thames Polymer Science Research Center, The University of Southern Mississippi, Hattiesburg, Mississippi
39406, United States
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92
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Kang RH, Zheng ML, Chen WQ, Zhao ZS, Duan XM. Bright fluorescent hollow structural nanoparticles prepared from amphiphilic molecules with C2v symmetry. RSC Adv 2012. [DOI: 10.1039/c2ra21394j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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93
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Ichikawa T, Yoshio M, Taguchi S, Kagimoto J, Ohno H, Kato T. Co-organisation of ionic liquids with amphiphilic diethanolamines: construction of 3D continuous ionic nanochannels through the induction of liquid–crystalline bicontinuous cubic phases. Chem Sci 2012. [DOI: 10.1039/c2sc00981a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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94
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Du P, Kong J, Wang G, Zhao X, Li G, Jiang X, Li Z. Hydrogen Bonded Supramolecular Polymers in Both Apolar and Aqueous Media: Self-Assembly and Reversible Conversion of Vesicles and Gels. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201100254] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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95
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Ishida Y, Sakata H, Achalkumar AS, Yamada K, Matsuoka Y, Iwahashi N, Amano S, Saigo K. Guest-Responsive Covalent Frameworks by the Cross-Linking of Liquid-Crystalline Salts: Tuning of Lattice Flexibility by the Design of Polymerizable Units. Chemistry 2011; 17:14752-62. [DOI: 10.1002/chem.201102422] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Indexed: 11/08/2022]
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96
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Stabilization of polyamidoamine (PAMAM) dendrimers/sodium dodecyl sulfate complexes via PEGylation. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.02.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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97
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Wang K, Guo DS, Wang X, Liu Y. Multistimuli responsive supramolecular vesicles based on the recognition of p-Sulfonatocalixarene and its controllable release of doxorubicin. ACS NANO 2011; 5:2880-2894. [PMID: 21443257 DOI: 10.1021/nn1034873] [Citation(s) in RCA: 234] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report the novel construction of nanosupramolecular binary vesicles based on host-guest complex formation between p-sulfonatocalix[4]arene and asymmetric viologen, which was identified by UV-vis and fluorescence spectroscopy, dynamic laser scattering, transmission electron microscopy, scanning electron microscopy, and surface tension experiments. The critical aggregation concentration of asymmetric viologen decreases pronouncedly by a factor of ca. 1000 owing to the complexation of p-sulfonatocalix[4]arene. Furthermore, we have demonstrated that the resulting vesicles can respond to multiple external stimuli, including temperature, host-guest inclusion, and redox. Methods of warming and inclusion of cyclodextrins were then employed to disrupt the vesicle architecture to release hydrophilic doxorubicin from the interior of the vesicle. Finally, cell experiments were performed to evaluate the cellular toxicity of the supramolecular binary vesicle and the anticancer efficiency of doxorubicin-loaded vesicle.
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Affiliation(s)
- Kui Wang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
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98
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Zhang S, Zhao Y. Facile preparation of organic nanoparticles by interfacial cross-linking of reverse micelles and template synthesis of subnanometer Au-Pt nanoparticles. ACS NANO 2011; 5:2637-2646. [PMID: 21366348 DOI: 10.1021/nn102666k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A single- and a double-tailed cationic surfactant with the triallylammonium headgroup formed reverse micelles (RMs) in heptane/chloroform containing a small amount of water. The reverse micelles were cross-linked at the interface upon UV irradiation in the presence of a water-soluble dithiol cross-linker and a photoinitiator. The resulting interfacially cross-linked reverse micelles (ICRMs) of the single-tailed surfactant aggregated in a solvent-dependent fashion, whereas those of the double-tailed were identical in size as the corresponding RMs. The ICRMs could extract anionic metal salts, such as AuCl(4)(-) and PtCl(6)(2-), from water into the organic phase. Au and Pt metal nanoparticles were produced upon reduction of metal salts. The covalent nature of the ICRMs made the template synthesis highly predictable, with the size of the metal particles controlled by the amount of the metal salt and the method of reduction. Nanoalloys were obtained by combining two metal precursors in the same reaction. Reduction of the ICRM-entrapped aurate also occurred without any external reducing agents, and the gold nanoparticles differed dramatically from those obtained through sodium borohydride reduction. The same template allowed the preparation of luminescent Au(4), Au(8), and Au(13)-Au(23) clusters, as well as gold nanoparticles several nanometers in size, simply by using different amounts of gold precursor and reducing conditions.
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Affiliation(s)
- Shiyong Zhang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, USA
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99
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Qin G, Li Z, Xia R, Li F, O’Neill BE, Goodwin JT, Khant HA, Chiu W, Li KC. Partially polymerized liposomes: stable against leakage yet capable of instantaneous release for remote controlled drug delivery. NANOTECHNOLOGY 2011; 22:155605. [PMID: 21389566 PMCID: PMC3157042 DOI: 10.1088/0957-4484/22/15/155605] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A critical issue for current liposomal carriers in clinical applications is their leakage of the encapsulated drugs that are cytotoxic to non-target tissues. We have developed partially polymerized liposomes composed of polydiacetylene lipids and saturated lipids. Cross-linking of the diacetylene lipids prevents the drug leakage even at 40 °C for days. These inactivated drug carriers are non-cytotoxic. Significantly, more than 70% of the encapsulated drug can be instantaneously released by a laser that matches the plasmon resonance of the tethered gold nanoparticles on the liposomes, and the therapeutic effect was observed in cancer cells. The remote activation feature of this novel drug delivery system allows for precise temporal and spatial control of drug release.
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Affiliation(s)
- Guoting Qin
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
| | - Zheng Li
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
| | - Rongmin Xia
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
| | - Feng Li
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
| | - Brian E. O’Neill
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
| | - Jessica T. Goodwin
- National Center for Macromolecular Imaging, Baylor College of Medicine, Houston, TX 77030 USA
| | - Htet A. Khant
- National Center for Macromolecular Imaging, Baylor College of Medicine, Houston, TX 77030 USA
| | - Wah Chiu
- National Center for Macromolecular Imaging, Baylor College of Medicine, Houston, TX 77030 USA
| | - King C. Li
- Department of Radiology, The Methodist hospital Research Institute, Houston, Texas 77030 USA
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100
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Yarimaga O, Lee S, Ham DY, Choi JM, Kwon SG, Im M, Kim S, Kim JM, Choi YK. Thermofluorescent Conjugated Polymer Sensors for Nano- and Microscale Temperature Monitoring. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100099] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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