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Li Z, Wang B, Dong Y, Jie G. A multi-modal biosensing platform based on Ag-ZnIn 2S 4@Ag-Pt nanosignal probe-sensitized UiO-66 for ultra-sensitive detection of penicillin. Food Chem 2024; 444:138665. [PMID: 38335689 DOI: 10.1016/j.foodchem.2024.138665] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 01/28/2024] [Accepted: 02/02/2024] [Indexed: 02/12/2024]
Abstract
We designed a multi-modal biosensing platform for versatile detection of penicillin based on a unique Ag-ZnIn2S4@Ag-Pt signal probe-sensitized UiO-66 metal-organic framework. Firstly, a large number of Ag-ZnIn2S4 quantum dots (AZIS QDs) were attached to Ag-Pt NPs, preparing a new multi-signal probe AZIS QDs@Ag-Pt NPs with excellent photoelectrochemistry (PEC), electrochemiluminescence (ECL), and fluorescence (FL) signals. Moreover, the AZIS QDs@Ag-Pt NPs signal probe can well match the energy level of UiO-66 metal-organic framework (MOF) with good photoelectric property, which can reverse the PEC current of UiO-66 to reduce false positives in detection. When penicillin was present, it bound to its aptamer to release the multifunctional signal probes, which can generate PEC, ECL, and PL signals, thus realizing ultrasensitive detection of penicillin by multi-signals. This work creates a novel three-signal QDs probe, which makes a great contribution to multi-mode photoelectric sensing analysis. The LOD of this work (3.48 fg·mL-1) was much lower than the MRLs (Maximum Residue Levels) established by the EU (4 ng·mL-1). The newly developed multi-mode biosensor has good practical application values in various biological detection, food assay, and early disease diagnosis.
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Affiliation(s)
- Zhikang Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Bing Wang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Yongxin Dong
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
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Wu D, Wang B, Jiang A, Dong Y, Jie G. Dual-mode photoelectrochemical radar based on CdS quantum dot and Ce-MOF for detection of low-abundance disease-associated proteins. Anal Chim Acta 2024; 1306:342585. [PMID: 38692786 DOI: 10.1016/j.aca.2024.342585] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 03/15/2024] [Accepted: 04/05/2024] [Indexed: 05/03/2024]
Abstract
Herein, we developed a convenient and versatile dual-mode electrochemiluminescence (ECL) and photoelectrochemistry (PEC) sensing radar for the detection of Prostate-specific antigen (PSA), which has important implications for detection of low-abundance disease-associated proteins. Cerium-based metal-organic framework (Ce-MOFs) were firstly modified on the electrode, showing well ECL and PEC property. In particular, a unique multifunctional Au@CdS quantum dots (QDs) probe loaded numerous QDs and antibody was fabricated, not only displaying strong ECL and PEC signals, but also having specific recognition to PSA. After the signal probe was linked to the electrode by immune reaction, much amplified signals of ECL and PEC were generated for double-mode detection of PSA. Therefore, this work proposed a multifunctional Au@CdS QDs signal probe with excellent ECL and PEC performance, and developed an ultrasensitive photoelectric biosensing platform for dual-mode detection, which provides an effective method for health monitoring of cancer patients.
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Affiliation(s)
- Di Wu
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, PR China; College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Bing Wang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, PR China; College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Ailing Jiang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, PR China; College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Yongxin Dong
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, PR China; College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, PR China; College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao 266042, PR China.
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Li H, Cai Q, Xue Y, Jie G. HOF-101-based dual-mode biosensor for photoelectrochemical/electrochemiluminescence detection and imaging of oxytetracycline. Biosens Bioelectron 2024; 245:115835. [PMID: 37979549 DOI: 10.1016/j.bios.2023.115835] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 10/24/2023] [Accepted: 11/09/2023] [Indexed: 11/20/2023]
Abstract
A unique hydrogen-bonded organic frameworks (HOF-101)-based photoelectrochemical (PEC) and electrochemiluminescence (ECL) dual-mode biosensor using polydopamine nanoparticles (PDAs) as quencher was constructed for ultrasensitive detection and imaging of oxytetracycline (OXY). In particular, HOF-101 was a superior ECL material and can be observed with the naked eye. Furthermore, it also had outstanding PEC signal, so HOF-101 was a new dual-signal material with excellent performance, thus it was explored to realize dual-mode detection. As the main component of natural melanin, PDAs not only had good biocompatibility, but also contained rich functional groups on the surface. Additionally, PDAs had excellent light absorption ability and poor conductivity, which made it the excellent photoquencher. In this work, PDAs were introduced on the surface of HOF-101 to quench its ECL and PEC signals by using the dual-aptamer sandwich method, achieving ultrasensitive detection of antibiotic OXY. Particularly for ECL detection, HOF-101 was firstly used to visually detect OXY. The detection range can reach 0.1 pM-100 nM, and the limit of detection (LOD) can reach 0.04 pM. This work showed a great contribution to the development of new ECL-PEC materials and ECL visualization analysis, which had outstanding application potential in the fields of food safety and biochemical analysis.
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Affiliation(s)
- Hongkun Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Qianqian Cai
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Yali Xue
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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Cai Q, Li H, Dong W, Jie G. Versatile photoelectrochemical biosensor based on AIS/ZnS QDs sensitized-WSe 2 nanoflowers coupled with DNA nanostructure probe for"On-Off"assays of TNF-α and MTase. Biosens Bioelectron 2023; 241:115704. [PMID: 37748401 DOI: 10.1016/j.bios.2023.115704] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/12/2023] [Accepted: 09/20/2023] [Indexed: 09/27/2023]
Abstract
Herein, a novel multifunctional photoelectrochemical (PEC) biosensor based on AgInS2 (AIS)/ZnS quantum dots (QDs) sensitized-WSe2 nanoflowers and DNA nanostructure signal probe was designed to achieve ultra-sensitive "On-Off" detection of human tumor necrosis factor α (TNF-α) and methylase Dam MTase (MTase). AIS/ZnS QDs as an excellent photosensitive material was found to match WSe2 in energy level for the first time, and the photocurrent signal after sensitization was 65 times that of WSe2 nanoflowers and 17.9 times that of AIS/ZnS QDs. Moreover, abundant AIS/ZnS QDs were loaded on the TiO2 nanoparticles with good conductivity by DNA to fabricate a multifunctional probe, which can not only amplify signal but also specifically recognize target. When target TNF-α was present, the AIS/ZnS QDs signal probe was attached to the WSe2 nanoflowers-modified electrode through binding to aptamer, and the amplified PEC signal was generated for "on" assay of TNF-α. Furthermore, Dam MTase as second target induced methylation of hairpin HDam, so it is cleaved by the endonuclease DpnI, resulting in the shedding of AIS/ZnS QDs signal probe for signal "off" detection of MTase. This work opened a new photosensitized probe and developed a promising PEC biosensor for dual-targets assay. By programming the DNA nanostructure, the biosensor can detect versatile targets in a simple and sensitive method, which has good practical application value in human serum.
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Affiliation(s)
- Qianqian Cai
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Hongkun Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Wenshuai Dong
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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Rusakov YY, Semenov VA, Rusakova IL. On the Efficiency of the Density Functional Theory (DFT)-Based Computational Protocol for 1H and 13C Nuclear Magnetic Resonance (NMR) Chemical Shifts of Natural Products: Studying the Accuracy of the pecS- n ( n = 1, 2) Basis Sets. Int J Mol Sci 2023; 24:14623. [PMID: 37834068 PMCID: PMC10572908 DOI: 10.3390/ijms241914623] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023] Open
Abstract
The basis set issue has always been one of the most important factors of accuracy in the quantum chemical calculations of NMR chemical shifts. In a previous paper, we developed new pecS-n (n = 1, 2) basis sets purposed for the calculations of the NMR chemical shifts of the nuclei of the most popular NMR-active isotopes of 1-2 row elements and successfully approbated these on the DFT calculations of chemical shifts in a limited series of small molecules. In this paper, we demonstrate the performance of the pecS-n (n = 1, 2) basis sets on the calculations of as much as 713 1H and 767 13C chemical shifts of 23 biologically active natural products with complicated stereochemical structures, carried out using the GIAO-DFT(PBE0) approach. We also proposed new alternative contraction schemes for our basis sets characterized by less contraction depth of the p-shell. New contraction coefficients have been optimized with the property-energy consistent (PEC) method. The accuracies of the pecS-n (n = 1, 2) basis sets of both the original and newly contracted forms were assessed on massive benchmark calculations of proton and carbon chemical shifts of a vast variety of natural products. It was found that less contracted pecS-n (n = 1, 2) basis sets provide no noticeable improvement in accuracy. These calculations represent the most austere test of our basis sets as applied to routine calculations of the NMR chemical shifts of real-life compounds.
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Affiliation(s)
| | | | - Irina L. Rusakova
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033 Irkutsk, Russia; (Y.Y.R.); (V.A.S.)
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Bai S, Fang Y, Zhao Y, Feng Y, Luo R, Li D, Chen A. Bi nanoparticles modified the WO 3/ZnWO 4 heterojunction for photoelectrochemical water splitting. J Colloid Interface Sci 2023; 646:745-752. [PMID: 37229992 DOI: 10.1016/j.jcis.2023.05.102] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 05/11/2023] [Accepted: 05/16/2023] [Indexed: 05/27/2023]
Abstract
The novel ternary photoanode was successfully prepared by Bi nanoparticles (Bi NPs) modified on type II heterojunction of WO3-ZnWO4 using the simple and effective drop casting and chemical impregnation methods. The photoelectrochemical (PEC) experimental tests revealed that the photocurrent density of the ternary photoanode of WO3/ZnWO4(2)/Bi NPs reaches 3.0 mA/cm2 at 1.23 V (vs. RHE), which is 6 times of the WO3 photoanode. The incident photon-to-electron conversion efficiency (IPCE) at 380 nm wave length reaches 68%, which increases 2.8 times compared to WO3 photoanode. The observed enhancement can be attributed to the formation of type II heterojunction and modification of Bi NPs. The former broadens the absorption range for visible light and improves the carrier separation efficiency, while the latter enhances the light capture ability through the local surface plasmon resonance (LSPR) effect of Bi NPs and the generation of hot electrons.
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Affiliation(s)
- Shouli Bai
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Yanling Fang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yingying Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yongjun Feng
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Ruixian Luo
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Aifan Chen
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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7
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Velusamy P, Liu X, Sathiya M, Alsaiari NS, Alzahrani FM, Nazir MT, Elamurugu E, Pandian MS, Zhang F. Investigate the suitability of g-C 3N 4 nanosheets ornamented with BiOI nanoflowers for photocatalytic dye degradation and PEC water splitting. Chemosphere 2023; 321:138007. [PMID: 36754306 DOI: 10.1016/j.chemosphere.2023.138007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/13/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
The two-step thermal polymerization and solvothermal approach is used to construct nano heterostructures of FCN and BiOI (bismuth oxeye iodide), both of which are Nobel metal-free materials. This work reports the effect nano-heterostructure on the micro-structural, light absorption capability, PEC properties and pollutant degradation efficiency of the synthesised heterostructures. The addition to that formation of FCN/BiOI nano-heterostructure enhances the solar light absorption. The FCN/BiOI nano heterostructure shows 10 times higher photocurrent density than the BCN nanostructure and 3.8 time higher that FCN. The FCN/BiOI has a high induced photo-current density (20.17 mA/cm2) and H2 evolution rate (3762 μmol h-1 cm-2) under solar light illumination (λ ≥ 420 nm) in comparison with the other. Furthermore, the photocatalytic performance of this material for the breakdown of methyl red dyes was much greater. Under solar light irradiation, the azo dyes were degraded in 90 min. The FCN/BiOI nano-heterostructure has a higher dye degradation efficiency of 97.91%. The rapid transport of photo-induced electrons in the FCN/BiOI nanocomposite is responsible for the improvement in PEC and PC performances. These impressive findings suggest that this nanocomposite might be used to facilitate the PEC water splitting and the PC degradation of MR in the presence of light. The current research provides insight on how to best tailor composition and structure for efficient FCN photo-electrocatalysis water splitting and Methyl red dye degradation.
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Affiliation(s)
- P Velusamy
- School of Physics and Electronic Information, Yan'an University, Yan'an, 716000, China; Department of Physics, Thiagarajar College of Engineering, Thiruparankundram, Madurai, Tamil Nadu, 625015, India
| | - Xinghui Liu
- School of Physics and Electronic Information, Yan'an University, Yan'an, 716000, China; Department of Materials Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMTS), Thandalam, Chennai, 602105, Tamilnadu, India.
| | - M Sathiya
- Department of Chemistry, Thiagarajar College, Madurai Kamaraj University, Madurai-625009, Tamil Nadu, India
| | - Norah Salem Alsaiari
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P. O. Box 84428, Riyadh, 11671, Saudi Arabia
| | - Fatimah Mohammed Alzahrani
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P. O. Box 84428, Riyadh, 11671, Saudi Arabia
| | - M Tariq Nazir
- School of Manufacturing Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Elangovan Elamurugu
- iDARE Laboratory, Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603 203, Tamilnadu, India
| | - M Senthil Pandian
- Research Center, SSN College of Engineering, Kalavakkam, 603110, Chennai, Tamil Nadu, India
| | - Fuchun Zhang
- School of Physics and Electronic Information, Yan'an University, Yan'an, 716000, China.
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Volokh M, Shalom M. Polymeric carbon nitride as a platform for photoelectrochemical water-splitting cells. Ann N Y Acad Sci 2023; 1521:5-13. [PMID: 36719040 DOI: 10.1111/nyas.14963] [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] [Indexed: 02/01/2023]
Abstract
Polymeric carbon nitride (CN) materials are promising low-cost photocatalysts that exhibit a combination of chemical and physical properties suitable for converting light into redox activity on their surface. In this perspective, we describe our experience with this family of materials as light absorbers that serve as an anode in photoelectrochemical cells toward water-splitting. We describe some of the CN deposition techniques and procedures established in our lab. The knowledge gained from powder-based photocatalysis is implemented in photoelectrochemical scenarios and is used to determine the merits and shortcomings of resulting layers. We show how the preparation methods are oriented based on these factors and how high photoelectrochemical water-splitting activity develops in photoanodes we developed where CN(s) act as photoabsorbers. Lastly, we present our view on the future prospects of this field.
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Affiliation(s)
- Michael Volokh
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Menny Shalom
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Park J, Yoon KY, Kwak MJ, Kang J, Kim S, Chaule S, Ha SJ, Jang JH. Boosting Charge Transfer Efficiency by Nanofragment MXene for Efficient Photoelectrochemical Water Splitting of NiFe(OH) x Co-Catalyzed Hematite. ACS Appl Mater Interfaces 2023; 15:9341-9349. [PMID: 36749965 DOI: 10.1021/acsami.2c20524] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The use of oxygen evolution co-catalysts (OECs) with hematite photoanodes has received much attention because of the potential to reduce surface charge recombination. However, the low surface charge transfer and bulk charge separation rate of hematite are not improved by decorating with OECs, and the intrinsic drawbacks of hematite still limit efficient photoelectrochemical (PEC) water splitting. Here, we successfully overcame the sluggish oxygen evolution reaction performance of hematite for water splitting by inserting zero-dimensional (0D) nanofragmented MXene (NFMX) as a hole transport material between the hematite and the OEC. The 0D NFMX was fabricated from two-dimensional (2D) MXene sheets and deposited onto the surface of a three-dimensional (3D) hematite photoanode via a centrifuge-assisted method without altering the inherent performance of the 2D MXene sheets. Among many OECs, NiFe(OH)x was selected as the OEC to improve hematite PEC performance in our system because of its efficient charge transport behavior and high stability. Because of the great synergy between NFMX and NiFe(OH)x, NiFe(OH)x/NFMX/Fe2O3 achieved a maximum photocurrent density of 3.09 mA cm-2 at 1.23 VRHE, which is 2.78-fold higher than that of α-Fe2O3 (1.11 mA cm-2). Furthermore, the poor stability of MXene in an aqueous solution for water splitting was resolved by uniformly coating it with NiFe(OH)x, after which it showed outstanding stability for 60 h at 1.23 VRHE. This study demonstrates the successful use of NFMX as a hole transport material combined with an OEC for highly efficient water splitting.
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Affiliation(s)
- Juhyung Park
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Ki-Yong Yoon
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Myung-Jun Kwak
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Jihun Kang
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Suhee Kim
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Sourav Chaule
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Seong-Ji Ha
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
| | - Ji-Hyun Jang
- School of Energy and Chemical Engineering, Department of Energy Engineering, Graduate School of Carbon Neutrality, UNIST, Ulsan 44919, Republic of Korea
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10
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Li X, Huang J, Ding J, Xiu M, Huang K, Cui K, Zhang J, Hao S, Zhang Y, Yu J, Huang Y. PEC/Colorimetric Dual-Mode Lab-on-Paper Device via BiVO 4/FeOOH Nanocomposite In Situ Modification on Paper Fibers for Sensitive CEA Detection. Biosensors (Basel) 2023; 13:bios13010103. [PMID: 36671939 PMCID: PMC9855910 DOI: 10.3390/bios13010103] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/02/2023] [Accepted: 01/04/2023] [Indexed: 06/06/2023]
Abstract
A dual-mode lab-on-paper device based on BiVO4/FeOOH nanocomposites as an efficient generating photoelectrochemical (PEC)/colorimetric signal reporter has been successfully constructed by integration of the lab-on-paper sensing platform and PEC/colorimetric detection technologies for sensitive detection of carcinoembryonic antigen (CEA). Concretely, the BiVO4/FeOOH nanocomposites were in situ synthesized onto the paper-working electrode (PWE) through hydrothermal synthesis of the BiVO4 layer on cellulose fibers (paper-based BiVO4) which were initially modified by Au nanoparticles for improving the conductivity of three dimensional PWE, and then the photo-electrodeposition of FeOOH onto the paper-based BiVO4 to construct the paper-based BiVO4/FeOOH for the portable dual-mode lab-on-paper device. The obtained nanocomposites with an FeOOH needle-like structure deposited on the BiVO4 layer exhibits enhanced PEC response activity due to its effective separation of the electron-hole pair which could further accelerate the PEC conversion efficiency during the sensing process. With the introduction of CEA targets onto the surface of nanocomposite-modified PWE assisted by the interaction with the CEA antibody from a specific recognition property, a signal-off PEC signal state with a remarkable photocurrent response decreasing trend can be achieved, realizing the quantitative detection of CEA with the PEC signal readout mode. By means of a smart origami paper folding, the colorimetric signal readout is achieved by catalyzing 3,3',5,5'-tetramethylbenzidine (TMB) to generate blue oxidized TMB in the presence of H2O2 due to the satisfied enzyme-like catalytic activity of the needle-like structure, FeOOH, thereby achieving the dual-mode signal readout system for the proposed lab-on-paper device. Under the optimal conditions, the PEC and colorimetric signals measurement were effectively carried out, and the corresponding linear ranges were 0.001-200 ng·mL-1 and 0.5-100 ng·mL-1 separately, with the limit of detection of 0.0008 and 0.013 ng·mL-1 for each dual-mode. The prepared lab-on-paper device also presented a successful application in serum samples for the detection of CEA, providing a potential pathway for the sensitive detection of target biomarkers in clinical application.
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Affiliation(s)
- Xu Li
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Jiali Huang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Jiayu Ding
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Mingzhen Xiu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Kang Huang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Kang Cui
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Jing Zhang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Shiji Hao
- School of Materials Science & Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Yan Zhang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
- Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science, MOE, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Jinghua Yu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Yizhong Huang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
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Yan X, Li H, Yin T, Jie G, Zhou H. Photoelectrochemical biosensing platform based on in situ generated ultrathin covalent organic framework film and AgInS 2 QDs for dual target detection of HIV and CEA. Biosens Bioelectron 2022; 217:114694. [PMID: 36113299 DOI: 10.1016/j.bios.2022.114694] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/27/2022] [Accepted: 09/02/2022] [Indexed: 11/02/2022]
Abstract
In this work, a new photoelectrochemical (PEC) biosensing platform based on an ordered two-dimensional (2D) ultrathin covalent organic framework (COF) film and AgInS2 quantum dots (QDs) has been developed to enable dual-target detection of HIV and CEA. The porous COF film was firstly in situ generated on ITO, displaying super-stable and intense photocurrent with excellent repeatability. Moreover, an effective PEC quenching probe was specifically designed by loading large number of AgInS2 QDs on Au nanoparticles (NPs). After target HIV-induced cyclic amplification process to generate abundant DNA S0, the Au NPs-AgInS2 QDs probe was binded to the COF film through DNA hybridization, enabling PEC signal of the COF film to turn "off" for ultra-sensitive detection of HIV. Furthermore, when CEA as the second target specifically binded to its aptamer, the Au NPs-AgInS2 QDs quenching probe was released, achieving PEC signal "on" of the T-DA COF film for ultra-sensitive detection of CEA. This work opened a unique 2-D COF film-based PEC biosensing platform with excellent signal for rapid detection of dual targets, which can effectively avoid false positives and negatives and shows promising application for early prevention and detection of cancer diseases.
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Affiliation(s)
- Xiaoshi Yan
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Hongkun Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Tengyue Yin
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
| | - Hong Zhou
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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Almamari MR, Ahmed NM, Holi AM, Yam FK, Kyaw HH, Almessiere MA, Al-Abri MZ. Some Distinct Attributes of ZnO Nanorods Arrays: Effects of Varying Hydrothermal Growth Time. Materials (Basel) 2022; 15:ma15175827. [PMID: 36079209 PMCID: PMC9457266 DOI: 10.3390/ma15175827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 06/01/2023]
Abstract
This study investigates the growth time effect on the structural, morphological, optical, and photoelectrochemical characteristics of highly oriented ZnO nanorod arrays (ZNRAs). The nanorod arrays were grown on ITO substrates using the unified sol-gel spin coating and hydrothermal techniques. ZnO nanoparticles (ZNPs) were synthesized using the sol-gel spin coating method. In contrast, the hydrothermal method was used to grow the ZnO nanorods. The hydrothermal growth time investigated was between 4 and 12 h. The synthesized ZNRAs were used as the photoanode electrodes to investigate their photoelectrochemical (PEC) electrode potency. The as-prepared ZNRAs were characterized using various analytical tools to determine their structures, morphologies, optical, and photoelectrochemical traits. EDX spectra showed the presence of uncontaminated ZnO chemical composition, and FTIR spectra displayed the various functional groups in the samples. A rod-shaped ZnO nanocrystallite with mean lengths and diameters of 300-500 nm and 40-90 nm, respectively, is depicted. HRTEM images indicated the nucleation and growth of ZNRAs with a lattice fringe spacing of 0.26 nm and a growth lattice planer orientation of [002]. The optimum ZNRAs (grown at 8 h) as photoelectrode achieved a photoconversion efficiency of 0.46% and photocurrent density of 0.63 mA/cm2, that was 17 times higher than the one shown by ZNPs with Ag/AgCl as the reference electrode. Both values were higher than those reported in the literature, indicating the prospect of these ZNRAs for photoelectrode applications.
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Affiliation(s)
- Mohammed Rashid Almamari
- Nanotechnology Research Center, Sultan Qaboos University, P.O. Box 17, Al Khoud, Muscat 123, Oman
- School of Physics, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - Naser M. Ahmed
- School of Physics, Universiti Sains Malaysia, Penang 11800, Malaysia
- Research Center, The University of Mashreq, Baghdad 10021, Iraq
| | - Araa Mebdir Holi
- Department of Physics, College of Education, University of Al-Qadisiyah, Al-Diwaniyah 58002, Al-Qadisiyah, Iraq
| | - F. K. Yam
- School of Physics, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - Htet Htet Kyaw
- Nanotechnology Research Center, Sultan Qaboos University, P.O. Box 17, Al Khoud, Muscat 123, Oman
| | - M. A. Almessiere
- Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
- Department of Biophysics, Institute for Research & Medical Consultatuins (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Mohammed Z. Al-Abri
- Nanotechnology Research Center, Sultan Qaboos University, P.O. Box 17, Al Khoud, Muscat 123, Oman
- Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, P.O. Box 33, Al Khould, Muscat 123, Oman
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Cui Z, Liu C, Cui S, Qin L, Zhang X, Guan J, Mao S. Exploring the potential of redispersible nanocomplex-in-microparticles for enhanced oral insulin delivery. Int J Pharm 2022; 612:121357. [PMID: 34890708 DOI: 10.1016/j.ijpharm.2021.121357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 11/09/2021] [Accepted: 12/03/2021] [Indexed: 11/20/2022]
Abstract
Polyelectrolyte nanocomplex (PEC) is a promising carrier for insulin encapsulation. However, tenacious enzymatic degradation and insufficient penetration in mucus and enterocyte are the dominating obstacles for their oral insulin delivery. Besides, the rate of insulin release should be tuned to achieve desired therapeutic effect and meanwhile with scale-up potential. Thus, PEC embedded microparticles were fabricated in this study to solve the above dilemma. First of all, insulin loaded PEC with sodium dodecyl sulfate (SDS) coating was prepared by self-assembly method and then spray-dried using different ratio chitosan (CS)/ polyvinyl alcohol (PVA) as the matrix to obtain the microparticles. Influence of the CS/PVA ratio on the in vitro and in vivo properties of the redispersed PEC was investigated systemically. It was demonstrated that when CS 50 kDa was used in the matrix, all the PEC could be well redispersed with particle size less than 250 nm, and good stability in the gastrointestinal tract, further improved enzymatic stability was achieved by nanoparticles-in-microparticles design, with CS/PVA 1:1 and 4:1 groups showing better and comparable protection. Insulin release from the microparticles decreased with the increase of CS ratio in the CS/PVA matrix. Spray-dried microparticles had less influence on the mucus penetration of the in situ redispersed PEC, with enhanced insulin permeation observed in different intestinal segments in a CS/PVA ratio dependent manner. And the CS/PVA 1:1 group, which presented good enzymatic stability, enhanced mucus penetration and moderate insulin release rate, exhibited the highest relative pharmacological availability of 6.80%. In conclusion, PEC in microparticles design using CS/PVA as the composite matrix is a potential platform for enhanced oral insulin delivery.
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Cai Q, Wu D, Li H, Jie G, Zhou H. Versatile photoelectrochemical and electrochemiluminescence biosensor based on 3D CdSe QDs-DNA nanonetwork-SnO 2 nanoflower coupled with DNA walker amplification for HIV detection. Biosens Bioelectron 2021; 191:113455. [PMID: 34175650 DOI: 10.1016/j.bios.2021.113455] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 10/21/2022]
Abstract
A novel 3D CdSe quantum dots (QDs)-DNA nanonetwork was assembled to sensitize the mesoporous SnO2 photoelectrochemical (PEC) substrate, which was coupled with a biped-DNA walker multiple amplification technique to design a versatile electrochemiluminescence (ECL) and PEC biosensor for dual detection of HIV. Firstly, the photosensitive CdSe QDs and SnO2 nanoflowers have well-matched band-edge energy level, thus their complex can promote effective transfer of the photogenerated carriers, and show better PEC and ECL property. Then, a novel 3D CdSe QDs-DNA nanonetwork was assembled and loaded with a large amount of QDs, which was used as multifunctional PEC and ECL probes. Moreover, the target-triggered biped DNA walker-cascade amplification method was introduced to generate a large amount of output DNA, which was used to link numerous 3D CdSe QDs-DNA nanonetwork probes to the electrode, generating greatly amplified signals for sensitive assay of HIV. The highly photosensitive 3D CdSe QDs-DNA reticulated nanomaterials have high stability and controllability, and display significantly improved PEC and ECL signals of the biosensor. This method opened a new photoelectric nanocomposite of QDs-sensitized SnO2 nanoflower, and developed a versatile biosensing strategy using the 3D CdSe QDS DNA sensitization probes for ultra-sensitive detection of biomolecules, which is important for the early diagnosis of diseases.
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Affiliation(s)
- Qianqian Cai
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Di Wu
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Hongkun Li
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Guifen Jie
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China.
| | - Hong Zhou
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering. Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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15
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Collivignarelli MC, Abbà A, Carnevale Miino M, Bertanza G, Sorlini S, Damiani S, Arab H, Bestetti M, Franz S. Photoelectrocatalysis on TiO 2 meshes: different applications in the integrated urban water management. Environ Sci Pollut Res Int 2021; 28:59452-59461. [PMID: 33570731 PMCID: PMC8541951 DOI: 10.1007/s11356-021-12606-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
Recently, among AOPs, photoelectrocatalysis (PEC) on TiO2 is gaining interest. In this study, five different real waters sampled in four different points of the integrated urban water management (IUWM) system were tested with PEC and UV alone, for comparison. This work aims to verify the effect of the PEC suggesting the optimal position in IUWM system where the PEC should be located to obtain the best performance. In groundwaters (GWs), PEC effectively removed atrazine-based compounds (> 99%), trichloroethylene, and perchloroethylene (96%), after 15 min of reaction time. However, given the low concentrations of emerging compounds, the synergistic effect of UV radiation with the catalyst and with the polarization of the mesh was not visible, with very few differences compared with the results obtained with UV alone. Pharmaceutical industrial wastewater (IWW) showed a significant increase in biodegradability after 2 h, both if subjected to PEC or UV (200%), despite the absence of COD removal. The PEC applied on IWW from a sewage sludge treatment plant allowed to effectively remove the COD (39.6%) and increase the biodegradability (300%). Good results in terms of COD removal (33.9%) and biodegradability increase (+900%) were also achieved testing PEC on wastewater treatment plant effluent. Except for GWs, PEC allowed significant EEO savings respect to UV alone (76.2-99.1%).
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Affiliation(s)
- Maria Cristina Collivignarelli
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
- Interdepartmental Centre for Water Research, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
| | - Alessandro Abbà
- Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy
| | - Marco Carnevale Miino
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
| | - Giorgio Bertanza
- Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy
| | - Sabrina Sorlini
- Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy
| | - Silvestro Damiani
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
| | - Hamed Arab
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
| | - Massimiliano Bestetti
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
| | - Silvia Franz
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via Mancinelli 7, 20131 Milano, Italy
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Hiremath G, Choksi YA, Acra S, Correa H, Dellon ES. Factors Associated With Adequate Lamina Propria Sampling and Presence of Lamina Propria Fibrosis in Children with Eosinophilic Esophagitis. Clin Gastroenterol Hepatol 2021; 19:1814-1823.e1. [PMID: 32707338 PMCID: PMC8033509 DOI: 10.1016/j.cgh.2020.07.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 07/14/2020] [Accepted: 07/16/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Esophageal biopsies in children with eosinophilic esophagitis (EoE) are often inadequate for assessment of lamina propria and lamina propria fibrosis (LPF). For children with EoE, little is known about the factors associated with adequate lamina propria (aLP) sampling or the relationship among epithelial features in esophageal biopsies with and without LPF. We aimed to evaluate aLP in esophageal biopsies from children with and without EoE, identify factors associated with aLP and LPF, and examine the relationship among epithelial features in biopsies with and without LPF in children with EoE. METHODS In a retrospective study, we analyzed clinical, endoscopic, and histologic data from 217 children (124 with EoE and 94 without EoE [controls]) using descriptive statistics, logistic regression, Spearman's correlation, and receiver operating characteristic curve analysis. Active and inactive EoE were defined per the 2011 consensus guidelines. RESULTS aLP was observed in biopsies from higher proportion of children with EoE (69%) than controls (31%) (P = .0001). Active EoE was independently associated with aLP (adjusted odds ratio [aOR], 4.23; 95% CI, 1.00-18.13; P = .05). Patient sex (aOR for boys, 8.37; 95% CI, 1.23-56.74; P = .03) and peak eosinophil count (aOR, 1.02; 95% CI, 1.01-1.04; P = .01) were independently associated with LPF. Epithelial features were strongly interrelated in biopsies with LPF, and the presence of specific epithelial features was associated with LPF. CONCLUSIONS aLP was observed in a higher proportion of esophageal biopsies from children with EoE than controls. EoE status, patient sex, and peak eosinophil count were associated with aLP sampling and LPF. Given the intricate relationship between epithelial features and LPF, computational models can be developed to identify children with esophageal biopsies without aLP who are at risk for LPF.
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Affiliation(s)
- Girish Hiremath
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Monroe Carell Jr. Children's Hospital at Vanderbilt, Vanderbilt University Medical Center, Nashville, Tennessee.
| | - Yash A. Choksi
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA,Veterans Affairs Tennessee Valley Health Care System, Nashville, Tennessee, USA
| | - Sari Acra
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Monroe Carell Jr. Children’s Hospital at Vanderbilt, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Hernan Correa
- Division of Pediatric Pathology, Monroe Carell Jr. Children’s Hospital at Vanderbilt, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Evan S. Dellon
- Division of Gastroenterology and Hepatology, University of North Carolina, Chapel Hill North Carolina, USA
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Rodrigues Pinto B, Linares JJ, de Vasconcelos Lanza MR, de Lourdes Souza F. UV-irradiation and BDD-based photoelectrolysis for the treatment of halosulfuron-methyl herbicide. Environ Sci Pollut Res Int 2021; 28:26762-26771. [PMID: 33495947 DOI: 10.1007/s11356-021-12603-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
This paper reports the development of a novel photoelectrochemical (PEC) oxidation technique based on UV-C irradiation and boron-doped diamond (BDD) anode and its application for the effective removal of the commercial herbicide halosulfuron-methyl (HSM). The study evaluated the influence of the following key operating variables in the photoelectrochemical process: current density, pH, temperature, and initial HSM concentration. With regard to HSM degradation/mineralization, the application of high current densities was found to be more advantageous once it promoted a more rapid degradation and mineralization, with 96% of total organic carbon removal, though the process became more energy-demanding over time. The initial concentration of HSM did not modify the relative degradation rate, though the degradation process became more efficient as expected in a mass-transfer controlled process. The use of acidic pH (pH 3) was found to be more suitable than neutral conditions; this is probably because an anionic resonant form of HSM may be formed in neutral conditions. The temperature level was also found to affect the rate of HSM removal and the degradation efficiency. Finally, the substitution of Na2SO4 by NaCl promoted a more rapid and effective degradation; this is attributed to high production of powerful oxidants. However, only 70% mineralization was reached after 3 h of treatment; this is probably related to the formation of recalcitrant chlorinated sub-products.
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Affiliation(s)
- Beatriz Rodrigues Pinto
- Center for Human and Natural Sciences, Federal University of ABC, CEP 09210-580, Avenida dos Estados, Santo André, SP, 5001, Brazil
| | - Jose Joaquin Linares
- Institute of Chemistry, University of Brasília, CEP 71605-00, Campus Darcy Ribeiro, Brasília, DF, Brazil
| | | | - Fernanda de Lourdes Souza
- Center for Human and Natural Sciences, Federal University of ABC, CEP 09210-580, Avenida dos Estados, Santo André, SP, 5001, Brazil.
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Garcia Garcia CE, Bossard F, Rinaudo M. Electrospun Biomaterials from Chitosan Blends Applied as Scaffold for Tissue Regeneration. Polymers (Basel) 2021; 13:1037. [PMID: 33810406 PMCID: PMC8036406 DOI: 10.3390/polym13071037] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 03/05/2021] [Revised: 03/19/2021] [Accepted: 03/24/2021] [Indexed: 12/31/2022] Open
Abstract
Our objective in this work was to summarize the main results obtained in processing pure chitosan and chitosan/hyaluronan complex in view of biomedical applications, taking advantage of their original properties. In addition, an electrospinning technique was selected to prepare nanofiber mats well adapted for tissue engineering in relation to the large porosity of the materials, allowing an exchange with the environment. The optimum conditions for preparation of purified and stable nanofibers in aqueous solution and phosphate buffer pH = 7.4 are described. Their mechanical properties and degree of swelling are given. Then, the prepared biomaterials are investigated to test their advantage for chondrocyte development after comparison of nanofiber mats and uniform films. For that purpose, the adhesion of cells is studied by atomic force microscopy (AFM) using single-cell force spectroscopy, showing the good adhesion of chondrocytes on chitosan. At the end, adhesion and proliferation of chondrocytes in vitro are examined and clearly show the interest of chitosan nanofiber mats compared to chitosan film for potential application in tissue engineering.
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Affiliation(s)
- Christian Enrique Garcia Garcia
- Departamento de Ingeniería Química, Universidad de Guadalajara, Blvd. M. García Barragán #1451, Guadalajara C.P. 44430, Jalisco, Mexico
- Institute of Engineering Universite, Universite Grenoble Alpes, CNRS, LRP 38000 Grenoble, France;
| | - Frédéric Bossard
- Institute of Engineering Universite, Universite Grenoble Alpes, CNRS, LRP 38000 Grenoble, France;
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Xu L, Duan W, Chen F, Zhang J, Li H. A photoelectrochemical aptasensor for the determination of bisphenol A based on the Cu (I) modified graphitic carbon nitride. J Hazard Mater 2020; 400:123162. [PMID: 32563909 DOI: 10.1016/j.jhazmat.2020.123162] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 06/05/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
Bisphenol A (BPA) has been penetrating every corner of our daily life via the entities of children's toys, food containers and electronic equipment. The ubiquitous exposure of BPA urges the implementation of supervising its emission in environment. This work designs a method of photoelectrochemical (PEC) aptasensing for the determination of BPA based on the Cu(I) modified carbon nitride (Cu/g-C3N4). The Cu/g-C3N4 was prepared by solvothermal reaction with the ionic liquid bis(1-hexadecyl-3-methylimidazolium) tetrachlorocuprate (II) as Cu source. Cu/g-C3N4 displays excellent PEC performances due to the introduction of Cu(I). The visible light absorption capacity and conductivity of g-C3N4 can be enhanced by introducing Cu(I). With the help of BPA-binding aptamer immobilized on the surface of Cu/g-C3N4, the Cu/g-C3N4 PEC aptasensor has adopted for the determination of BPA. The PEC aptasensor exhibits a well-fitted linear correlation between the response photocurrent signal and the logarithm of the concentration of BPA. The PEC aptasensor shows a distinguished capability of BPA detection with a wide detection range of 5.00 × 10-11 to 5.00 × 10-5 g L-1 and low detection limit of 1.60 × 10-11 g L-1 (at S/N = 3). This work provides a profound insight for detecting BPA in environmental water.
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Affiliation(s)
- Li Xu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Key Laboratory of Zhenjiang, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Wei Duan
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Key Laboratory of Zhenjiang, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Feng Chen
- Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, 1 Kerui Road, Suzhou 215009, PR China
| | - Jianming Zhang
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Key Laboratory of Zhenjiang, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China
| | - Henan Li
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Key Laboratory of Zhenjiang, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China.
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Caliò A, Ammendola S, Brunelli M, Pedron S, Gobbo S, Martignoni G. Parvalbumin immunohistochemical expression in the s pectrum of perivascular epithelioid cell (PEC) lesions of the kidney. Virchows Arch 2021; 478:785-91. [PMID: 32524185 DOI: 10.1007/s00428-020-02856-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/12/2020] [Accepted: 05/28/2020] [Indexed: 01/07/2023]
Abstract
Parvalbumin is a cytosolic calcium-binding protein expressed in the distal convoluted tubule of the renal nephron. Among epithelial renal tumors, the reactivity for parvalbumin is observed in chromophobe renal cell carcinomas and frequently in oncocytomas. On the other hand, there are no data available on parvalbumin expression in the mesenchymal tumors of the kidney. Therefore, the purpose of this study was to evaluate the expression of parvalbumin in the spectrum of PEC (perivascular epithelioid cells) lesions of the kidney. Sixty-six PEC lesions (37 classic angiomyolipomas, 10 microscopic angiomyolipomas, 7 epithelioid angiomyolipomas/pure epithelioid PEComas, 5 leiomyoma-like angiomyolipomas, 3 lipoma-like angiomyolipomas, 2 intraglomerular lesions, 1 angiomyolipoma with epithelial cysts (AMLEC), and 1 sclerosing angiomyolipoma) were immunohistochemically stained with parvalbumin. Overall, parvalbumin immunostain was found in fifty-six PEC lesions (85%) and absent in the remaining ten cases (15%). Classic angiomyolipomas were positive in almost all cases (97%). Intraglomerular lesions and AMLEC showed parvalbumin immunolabeling as well. None of the 7 epithelioid angiomyolipomas/pure epithelioid PEComas or the only sclerosing angiomyolipoma expressed parvalbumin. In conclusion, we demonstrated the immunolabeling of parvalbumin in almost all PEC lesions of the kidney, but not in the epithelioid angiomyolipoma/pure epithelioid PEComa. This finding could shed light on some biological characteristics observed in the PEC lesions such as the plasticity of their cellular component. Moreover, parvalbumin may be another useful tool in the differential diagnosis among epithelioid angiomyolipoma/pure epithelioid PEComa with other renal eosinophilic tumors, such as oncocytoma and chromophobe renal cell carcinoma.
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Adepoyibi T, Keam T, Kuma A, Haihuie T, Hapolo M, Islam S, Akumu B, Chani K, Morris L, Taune M. A pilot model of patient education and counselling for drug-resistant tuberculosis in Daru, Papua New Guinea. Public Health Action 2019; 9:S80-S82. [PMID: 31579655 PMCID: PMC6735450 DOI: 10.5588/pha.18.0096] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 04/12/2019] [Indexed: 11/10/2022] Open
Abstract
Education and counselling for people with drug-resistant tuberculosis (DR-TB) is recommended by the World Health Organization, given the arduous treatment journey. A model of education and counselling involving counsellors and peer counsellors, standard sessions and novel education tools was piloted in the high DR-TB burden context of Daru, Papua New Guinea. The pilot contributed to high retention in care, highlighting the need for investment in scalable models. Future models will need to be adapted as better tolerated regimens are introduced. A focus on patient-centred care requires prioritisation in order to meet the End TB Strategy targets.
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Affiliation(s)
- T Adepoyibi
- Burnet Institute, Melbourne, Victoria, Australia
| | - T Keam
- Burnet Institute, Melbourne, Victoria, Australia
| | - A Kuma
- Burnet Institute, Melbourne, Victoria, Australia
| | - T Haihuie
- Daru General Hospital, Daru, Western Province, Papua New Guinea (PNG)
| | - M Hapolo
- Daru General Hospital, Daru, Western Province, Papua New Guinea (PNG)
| | - S Islam
- Burnet Institute, Melbourne, Victoria, Australia
| | - B Akumu
- Burnet Institute, Melbourne, Victoria, Australia
| | - K Chani
- Burnet Institute, Melbourne, Victoria, Australia
| | - L Morris
- Western Province Health Department, Daru, Western Province, PNG
| | - M Taune
- Daru General Hospital, Daru, Western Province, Papua New Guinea (PNG)
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22
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Li Q, Fu X, Ge X, Tao F, Huang P, Ge M, Jin H. Antitumor Effects and Related Mechanisms of Ethyl Acetate Extracts of Polygonum perfoliatum L. Front Oncol 2019; 9:578. [PMID: 31334112 PMCID: PMC6621420 DOI: 10.3389/fonc.2019.00578] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/14/2019] [Indexed: 12/20/2022] Open
Abstract
Polygonum perfoliatum L. belongs to the genus Polygonaceae and has a long history to be used as a Chinese medicinal herb to reduce swelling, control body temperature, and promote detoxification. However, its anticancer activity and mechanisms of action have not been evaluated yet. In the present study, we used several cell lines and xenograft models from different cancers to demonstrate the broad-spectrum anticancer activity of P. perfoliatum L as well as its underlying mechanisms of action in vitro and in vivo. The ethyl acetate extract of P. perfoliatum L showed good anticancer activity and was further fractioned to obtain five active components, including PEA to PEE. Among these fractions, PEC showed the strongest cytotoxicities against various cancer cell lines. It was further observed that PEC inhibited cancer cell growth, arrested cells at G2 phase, and induced apoptosis in vitro and suppressed tumor growth and angiogenesis in vivo in a dose- and time-dependent manner. Furthermore, PEC decreased the expression of vascular endothelial growth factor (VEGF) and micro-vascular density (MVD) in tumor tissues in vivo. It also promoted the proliferation of T and B lymphocytes, increased the activities of natural killer (NK) cells and cytotoxic T lymphocytes (CTLs), enhanced the secretion of interleukin 2 (IL-2) by spleen cells, and raised the levels of IgG, IgG2a, and IgG2b antibodies in tumor-bearing mice in vivo, which were at least partially responsible for the anticancer activity of PEC. In summary, PEC has shown broad-spectrum anticancer activities without causing any host toxicity in vitro and in vivo and may be developed as a preventive and therapeutic agent against human cancer. Further studies are urgently needed to determine the anticancer compounds in PEC and their detailed molecular mechanisms.
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Affiliation(s)
- Qinglin Li
- Sir Run Run Shaw Hospital, Medical School of Zhejiang University, Hangzhou, China.,Zhejiang Cancer Hospital, Hangzhou, China
| | | | - Xinyang Ge
- Heartland Christian School, Columbiana, OH, United States
| | - Feng Tao
- College of Pharmacy, Hangzhou Medical College, Hangzhou, China
| | - Ping Huang
- Zhejiang Cancer Hospital, Hangzhou, China
| | - Minghua Ge
- Zhejiang Cancer Hospital, Hangzhou, China
| | - Hongchuan Jin
- Sir Run Run Shaw Hospital, Medical School of Zhejiang University, Hangzhou, China
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Letsinger S, Kay P. Comparison of Prioritisation Schemes for Human Pharmaceuticals in the Aquatic Environment. Environ Sci Pollut Res Int 2019; 26:3479-3491. [PMID: 30515684 PMCID: PMC6513794 DOI: 10.1007/s11356-018-3834-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 11/22/2018] [Indexed: 05/22/2023]
Abstract
Only a small proportion of pharmaceuticals available for commercial use have been monitored in the aquatic environment, and even less is known about the effects on organisms. With thousands of pharmaceuticals in use, it is not feasible to monitor or assess the effects of all of these compounds. Prioritisation schemes allow the ranking of pharmaceuticals based on their potential as environmental contaminants, allowing resources to be appropriately used on those which are most likely to enter the environment and cause greatest harm. Many different types of prioritisation schemes exist in the literature and those utilising predicted environmental concentrations (PECs), the fish plasma model (FPM), critical environmental concentrations (CECs) and acute ecotoxicological data were assessed in the current study using the 50 most prescribed drugs in the UK. PECs were found to be overestimates of mean measured environmental concentrations but mainly underestimations of maximum concentrations. Acute ecological data identified different compounds of concern to the other effects assessments although the FPM and CECs methods were more conservative. These schemes highlighted antidepressants, lipid regulators, antibiotics, antihypertensive compounds and ibuprofen as priority compounds for further study and regulation.
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Affiliation(s)
- Sarah Letsinger
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, LS2 9JT, UK.
| | - Paul Kay
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, LS2 9JT, UK
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24
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de Aquino ABM, Leal LA, Carvalho-Silva VH, Gargano R, Ribeiro Junior LA, da Cunha WF. Krypton-methanol s pectroscopic study: Assessment of the complexation dynamics and the role of the van der Waals interaction. Spectrochim Acta A Mol Biomol Spectrosc 2018; 205:179-185. [PMID: 30015023 DOI: 10.1016/j.saa.2018.06.110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/26/2018] [Accepted: 06/30/2018] [Indexed: 06/08/2023]
Abstract
The Kr-CH3OH (Krypton-Methanol) system has several technological applications, such as the determination of diffusivity coefficients, their use in the development of detectors and combustion techniques among others. We report an extensive theoretical study concerning the stability of such complex. A mix between molecular dynamics, electronic structure calculations and solution of the nuclear Schrodinger equation lead to investigation of spectroscopic constants, lifetime of the complex and its Quantum Theory Atom in Molecules (QTAIM) properties. The study of the Potential Energy Curves (PEC) suggested three configurations to be stable as their potential well were able to harbor 9 vibrational levels. Properties from the curves also allowed us to obtain the lifetime of the complex, whose values were >1 ps regardless of the conformation. Furthermore, topological investigations of the charge density profile of the complex, in the scope of QTAIM properties, show that van der Waals type interactions takes place between the noble gas and the methanol molecule. These features are in consonance to the experimental fact that this complex is stable.
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Affiliation(s)
- Amanda Bárbara Mendes de Aquino
- Anapolis Group of Theoretical and Structural Chemistry, Goias State University - Exact Science and Technology Campus, Anapolis 75001-970, Brazil
| | | | - Valter H Carvalho-Silva
- Anapolis Group of Theoretical and Structural Chemistry, Goias State University - Exact Science and Technology Campus, Anapolis 75001-970, Brazil
| | - Ricardo Gargano
- Institute of Physics, University of Brasilia, Brasilia 70910-900, Brazil
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25
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Conzatti G, Cavalie S, Gayet F, Torrisani J, Carrère N, Tourrette A. Elaboration of a thermosensitive smart biomaterial: From synthesis to the ex vivo bioadhesion evaluation. Colloids Surf B Biointerfaces 2018; 175:91-97. [PMID: 30522012 DOI: 10.1016/j.colsurfb.2018.11.084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 11/08/2018] [Accepted: 11/29/2018] [Indexed: 01/08/2023]
Abstract
Alginate and chitosan are polysaccharides that are widely used in the biomedical field, especially as wound dressings. Controlled bioadhesion is an advanced functionality that offers the potential to reduce injuries due to the stripping-off of the biomaterial. Herein, we report the efficient grafting of poly-N(isopropylacryamide) (PNIPAM), a thermosensitive polymer that exhibits a lower critical solution temperature (LCST) at 32 °C on the alginate/chitosan polyelectrolyte complex (PEC) surface. In vitro studies did not exhibit a cytotoxic effect, and cells adhered preferentially on the LCST on PNIPAM grafted surfaces, as reported in the literature. Ex vivo investigations revealed that the adhesive behavior of the biomaterials was not the same on the liver and pancreas. The effect of the temperature on the bioadhesion to organs was unexpected, as PNIPAM surfaces exhibited higher adhesion at low temperature. The PNIPAM was therefore able to confer PEC matrix thermosensitivity, but due to the application force, interactions between PNIPAM chains and their substrate could influence bioadhesion on tissues.
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Affiliation(s)
- G Conzatti
- CIRIMAT, Université de Toulouse 3 - Paul Sabatier, CNRS, Toulouse, France
| | - S Cavalie
- CIRIMAT, Université de Toulouse 3 - Paul Sabatier, CNRS, Toulouse, France
| | - F Gayet
- LCC, Université de Toulouse 3 - Paul Sabatier, CNRS, Toulouse, France
| | - J Torrisani
- INSERM, Université Toulouse 3 - Paul Sabatier, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France
| | - N Carrère
- INSERM, Université Toulouse 3 - Paul Sabatier, Centre de Recherches en Cancérologie de Toulouse, Toulouse, France; Gastrointestinal Surgery department, Purpan Hospital - CHU de Toulouse, Toulouse, France
| | - A Tourrette
- CIRIMAT, Université de Toulouse 3 - Paul Sabatier, CNRS, Toulouse, France.
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26
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Basheva D, Moten D, Stoyanov P, Belkinova D, Mladenov R, Teneva I. Content of phycoerythrin, phycocyanin, alophycocyanin and phycoerythrocyanin in some cyanobacterial strains: Applications. Eng Life Sci 2018; 18:861-866. [PMID: 32624879 PMCID: PMC6999198 DOI: 10.1002/elsc.201800035] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 02/26/2018] [Revised: 05/04/2018] [Accepted: 05/16/2018] [Indexed: 12/14/2022] Open
Abstract
Cyanobacteria are unique prokaryotes, which are capable to perform oxygenic photosynthesis. Within these organisms, phycobilisomes (PBS) act as an antenna of the photosynthetic pigment apparatus. Phycobilisomes contain several phycobiliproteins (PBP): phycoerythrin (PE), phycocyanin (PC), allophycocyanin (APC) and phycoerythrocyanin (PEC). The application of phycobiliproteins in the biotechnology, food industry and medicine during the last years is rapidly increasing. The aim of our study was to assess the qualitative and quantitative content of phycoerythrin, phycocyanin, allophycocyanin and phycoerythrocyanin in 14 cyanobacterial strains kept in Plovdiv Algal Culture Collection (PACC) and 4 strains purchased from the Culture Collection of Autotrophic Organisms (CCALA). Our data demonstrated that three strains of Microcoleus autumnalis (PACC 5505, PACC 5522 and PACC 5527) have high potential to produce phycoerythrins (0.132, 0.201 and 0.136 mg/mL, respectively). Similarly, one Microcoleus autumnalis strain (PACC 5522) and one strain of Leptolyngbya boryana (CCALA 084) are suitable for biotechnological production of phycocyanins (0.051 and 0.264 mg/mL, respectively) as well as allophycocyanins (0.102 and 0.171 mg/mL, respectively). In addition, the data about the pigment content could be used as a biochemical marker for taxonomic purposes within the group.
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Affiliation(s)
- Diyana Basheva
- Department of Botany and Teaching Methods in BiologyUniversity of Plovdiv “Paisii Hilendarski”PlovdivBulgaria
| | - Dzhemal Moten
- Department of Developmental BiologyUniversity of Plovdiv “Paisii Hilendarski”PlovdivBulgaria
| | - Plamen Stoyanov
- Department of Botany and Teaching Methods in BiologyUniversity of Plovdiv “Paisii Hilendarski”PlovdivBulgaria
| | - Detelina Belkinova
- Institute of Biodiversity and Ecosystem ResearchBulgarian Academy of SciencesSofiaBulgaria
| | - Rumen Mladenov
- Department of Botany and Teaching Methods in BiologyUniversity of Plovdiv “Paisii Hilendarski”PlovdivBulgaria
| | - Ivanka Teneva
- Department of Botany and Teaching Methods in BiologyUniversity of Plovdiv “Paisii Hilendarski”PlovdivBulgaria
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27
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Tekie FSM, Soleimani M, Zakerian A, Dinarvand M, Amini M, Dinarvand R, Arefian E, Atyabi F. Glutathione responsive chitosan-thiolated dextran conjugated miR-145 nanoparticles targeted with AS1411 aptamer for cancer treatment. Carbohydr Polym 2018; 201:131-40. [PMID: 30241804 DOI: 10.1016/j.carbpol.2018.08.060] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 08/04/2018] [Accepted: 08/15/2018] [Indexed: 01/12/2023]
Abstract
miR-145 is a tumor suppressive miRNA which is abnormally reduced in different cancers. miR-145 overexpression reduces cancer migration, invasion, and cell adhesion. Increasing miR-145 level using suitable and efficient gene delivery systems could be valuable in cancer treatment. In this study, a redox-responsive miR-145 conjugated thiolated dextran (TD-miR) was prepared. Also, polyelectrolyte complexes (PECs) of TD-miR and chitosan were fabricated and decorated with anti nucleolin aptamer, AS1411 (apt-PEC). The size of the PECs was between 40-270 nm, and the zeta potential was varied according to the TD-miR to chitosan molar ratio. The outcomes of cellular studies indicated the excellence of the apt-PEC as a duel targeted delivery system and the PECs composed of chitosan 18 kDa with TD-miR to chitosan ratio of 5. TD-miR and the PECs are appropriate as the smart gene delivery systems which preserve and transfect the cargo and release it in cytoplasm.
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Nur M, Vasiljevic T. Insulin Inclusion into a Tragacanth Hydrogel: An Oral Delivery System for Insulin. Materials (Basel) 2018; 11:E79. [PMID: 29304023 PMCID: PMC5793577 DOI: 10.3390/ma11010079] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 12/29/2017] [Accepted: 01/03/2018] [Indexed: 12/18/2022]
Abstract
Nanoparticles or microparticles created by physical complexation between two polyelectrolytes may have a prospective use as an excipient for oral insulin administration. Natural polymers such as tragacanth, alginate, dextran, pullulan, hyaluronic acid, gelatin and chitosan can be potential candidates for this purpose. In this research, insulin particles were prepared by the inclusion of insulin into a tragacanth hydrogel. The effect of the pH and concentration relationship involving polyelectrolytes offering individual particle size and zeta potential was assessed by zetasizer and scanning electron microscopy (SEM). Insulin-tragacanth interactions at varying pH (3.7, 4.3, 4.6, or 6), and concentration (0.1%, 0.5%, or 1% w/w) were evaluated by differential scanning calorimetry (DSC) and ATR Fourier transform infrared (ATR-FTIR) analysis. Individual and smaller particles, approximately 800 nm, were acquired at pH 4.6 with 0.5% of tragacanth. The acid gelation test indicated that insulin could be entrapped in the physical hydrogel of tragacanth. DSC thermograms of insulin-tragacanth showed shifts on the same unloaded tragacanth peaks and suggested polyelectrolyte-protein interactions at a pH close to 4.3-4.6. FTIR spectra of tragacanth-insulin complexes exhibited amide absorption bands featuring in the protein spectra and revealed the creation of a new chemical substance.
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Affiliation(s)
- Mokhamad Nur
- Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, PO Box 14428, Melbourne 8001, Australia.
- Department of Agricultural Product Technology, Faculty of Agricultural Technology, Brawijaya University, Jl. Veteran, Malang 65145, Indonesia.
| | - Todor Vasiljevic
- Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, PO Box 14428, Melbourne 8001, Australia.
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29
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Ulapane N, Alempijevic A, Vidal Calleja T, Valls Miro J. Pulsed Eddy Current Sensing for Critical Pipe Condition Assessment. Sensors (Basel) 2017; 17:E2208. [PMID: 28954392 DOI: 10.3390/s17102208] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/05/2017] [Accepted: 09/20/2017] [Indexed: 11/26/2022]
Abstract
Pulsed Eddy Current (PEC) sensing is used for Non-Destructive Evaluation (NDE) of the structural integrity of metallic structures in the aircraft, railway, oil and gas sectors. Urban water utilities also have extensive large ferromagnetic structures in the form of critical pressure pipe systems made of grey cast iron, ductile cast iron and mild steel. The associated material properties render NDE of these pipes by means of electromagnetic sensing a necessity. In recent years PEC sensing has established itself as a state-of-the-art NDE technique in the critical water pipe sector. This paper presents advancements to PEC inspection in view of the specific information demanded from water utilities along with the challenges encountered in this sector. Operating principles of the sensor architecture suitable for application on critical pipes are presented with the associated sensor design and calibration strategy. A Gaussian process-based approach is applied to model a functional relationship between a PEC signal feature and critical pipe wall thickness. A case study demonstrates the sensor’s behaviour on a grey cast iron pipe and discusses the implications of the observed results and challenges relating to this application.
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30
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Li K, Huang Z, Zeng X, Huang B, Gao S, Lu J. Synergetic Effect of Ti 3+ and Oxygen Doping on Enhancing Photoelectrochemical and Photocatalytic Properties of TiO 2/g-C 3N 4 Heterojunctions. ACS Appl Mater Interfaces 2017; 9:11577-11586. [PMID: 28266841 DOI: 10.1021/acsami.6b16191] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
To improve the utilization of visible light and reduce photogenerated electron/hole recombination, Ti3+ self-doped TiO2/oxygen-doped graphitic carbon nitride (Ti3+-TiO2/O-g-C3N4) heterojunctions were prepared via hydrothermal treatment of a mixture of g-C3N4 and titanium oxohydride sol obtained from the reaction of TiH2 with H2O2. In this way, exfoliated O-g-C3N4 and Ti3+-TiO2 nanoparticles were obtained. Simultaneously, strong bonding was formed between Ti3+-TiO2 nanoparticles and exfoliated O-g-C3N4 during the hydrothermal process. Charge transfer and recombination processes were characterized by transient photocurrent responses, electrochemical impedance test, and photoluminescence spectroscopy. The photocatalytic performances were investigated through rhodamine B degradation test under an irradiation source based on 30 W cold visible-light-emitting diode. The highest visible-light photoelectrochemical and photocatalytic activities were observed from the heterojunction with 1:2 mass ratio of Ti3+-TiO2 to O-g-C3N4. The photodegradation reaction rate constant based on this heterojuction is 0.0356 min-1, which is 3.87 and 4.56 times higher than those of pristine Ti3+-TiO2 and pure g-C3N4, respectively. The remarkably high photoelectrochemical and photocatalytic performances of the heterojunctions are mainly attributed to the synergetic effect of efficient photogenerated electron-hole separation, decreased electron transfer resistance from interfacial chemical hydroxy residue bonds, and oxidizing groups originating from Ti3+-TiO2 and O-g-C3N4.
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Affiliation(s)
- Kai Li
- College of Chemistry and Materials Science, Ludong University , Yantai 264025, People's Republic of China
| | - Zhenyu Huang
- College of Chemistry and Materials Science, Ludong University , Yantai 264025, People's Republic of China
| | - Xiaoqiao Zeng
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Baibiao Huang
- State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, People's Republic of China
| | - Shanmin Gao
- College of Chemistry and Materials Science, Ludong University , Yantai 264025, People's Republic of China
| | - Jun Lu
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
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Franquet-Griell H, Cornadó D, Caixach J, Ventura F, Lacorte S. Determination of cytostatic drugs in Besòs River (NE Spain) and comparison with predicted environmental concentrations. Environ Sci Pollut Res Int 2017; 24:6492-6503. [PMID: 28074365 DOI: 10.1007/s11356-016-8337-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 12/25/2016] [Indexed: 06/06/2023]
Abstract
The number of cytostatic drugs used in cancer treatments is wide and increases every year; therefore, tools have been developed to predict their concentration in the environment to prioritize those for monitoring studies. In the present study, the predicted environmental concentrations (PECs) were calculated according to consumption data in Catalonia (NE Spain) for 2014. According to PECs and to the most widely reported compounds, 19 cytostatics were monitored in two sampling campaigns performed along the Besòs River. A total of seven drugs were detected at levels between 0.5 and 656 ng L-1. PEC and measured environmental concentrations (MECs) were compared in order to validate PECs. The PEC/MEC ratio presented a good agreement between predicted and measured concentrations confirming the PEC estimations. Mycophenolic acid, prioritized as the compound with the highest PEC, was detected at the highest concentrations (8.5-656 ng L-1) but showed no risk for aquatic organisms (risk quotient <1) considering acute toxicity tests performed in Daphnia magna.
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Affiliation(s)
- Helena Franquet-Griell
- Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain
| | - Deborah Cornadó
- Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain
| | - Josep Caixach
- Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain
| | - Francesc Ventura
- Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain
| | - Silvia Lacorte
- Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain.
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32
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Lindim C, van Gils J, Georgieva D, Mekenyan O, Cousins IT. Evaluation of human pharmaceutical emissions and concentrations in Swedish river basins. Sci Total Environ 2016; 572:508-519. [PMID: 27552129 DOI: 10.1016/j.scitotenv.2016.08.074] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/10/2016] [Accepted: 08/11/2016] [Indexed: 06/06/2023]
Abstract
An emissions inventory for top consumed human pharmaceuticals in Sweden was done based on national consumption data, human metabolic rates and wastewater treatment removal rates. Concentrations of pharmaceuticals in surface waters in Swedish river basins were predicted using estimated emissions from the inventory and river discharges. Our findings indicate that the top ten emitted pharmaceuticals in our study set of 54 substances are all emitted in amounts above 0.5ton/y to both surface waters and soils. The highest emissions to water were in decreasing order for Metformin, Furosemide, Gabapentin, Atenolol and Tramadol. Predicted emissions to soils calculated with the knowledge that in Sweden sludge is mostly disposed to soil, point to the highest emissions among the studied drugs coming from, in decreasing order, Metformin, Paracetamol, Ibuprofen, Gabapentin and Atenolol. Surface water concentrations in Sweden's largest rivers, all located in low density population zones, were found to be below 10ng/L for all substances studied. In contrast, concentrations in surface waters in Stockholm's metropolitan area, the most populous in Sweden, surpassed 100ng/L for four substances: Atenolol, Metformin, Furosemide and Gabapentin.
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Affiliation(s)
- C Lindim
- ACES - Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-10691 Stockholm, Sweden.
| | - J van Gils
- Deltares, PO Box 177, 2600 MH Delft, The Netherlands.
| | - D Georgieva
- Laboratory of Mathematical Chemistry, University "Prof. As. Zlatarov", 8010 Bourgas, Bulgaria.
| | - O Mekenyan
- Laboratory of Mathematical Chemistry, University "Prof. As. Zlatarov", 8010 Bourgas, Bulgaria.
| | - I T Cousins
- ACES - Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-10691 Stockholm, Sweden.
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33
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Meyer W, Reich M, Beier S, Behrendt J, Gulyas H, Otterpohl R. Measured and predicted environmental concentrations of carbamazepine, diclofenac, and metoprolol in small and medium rivers in northern Germany. Environ Monit Assess 2016; 188:487. [PMID: 27465046 DOI: 10.1007/s10661-016-5481-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 07/13/2016] [Indexed: 06/06/2023]
Abstract
This study evaluated the impact of secondary municipal effluent discharge on carbamazepine, diclofenac, and metoprolol concentrations in small and medium rivers in northern Germany and compared the measured environmental concentrations (MECs) to the predicted environmental concentrations (PECs) calculated with four well-established models. During a 1-year sampling period, secondary effluent grab samples were collected at four wastewater treatment plants (WWTPs) together with grab samples from the receiving waters upstream and downstream from the wastewater discharge points. The carbamazepine, diclofenac, and metoprolol concentrations were analyzed with high-performance liquid chromatography-tandem mass spectrometry (HPLC/MS-MS) after solid phase extraction. In the secondary effluents, 84-790 ng/L carbamazepine, 395-2100 ng/L diclofenac, and 745-5000 ng/L metoprolol were detected. The carbamazepine, diclofenac, and metoprolol concentrations analyzed in the rivers downstream from the secondary effluent discharge sites ranged from <5 to 68, 370, and 520 ng/L, respectively. Most of the downstream pharmaceutical concentrations were markedly higher than the corresponding upstream concentrations. The impact of wastewater discharge on the MECs in rivers downstream from the WWTPs was clearly demonstrated, but the correlations of the MECs with dilution factors were poor. The smallest rivers exhibited the largest maximum MECs and the widest ranges of MECs downstream from the wastewater discharge point. Three of the four tested models were conservative, as they showed higher PECs than the MECs in the rivers downstream from the WWTPs. However, the most detailed model underestimated the diclofenac concentrations.
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Affiliation(s)
- Wibke Meyer
- Institute of Wastewater Management and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073, Hamburg, Germany
| | - Margrit Reich
- Central Laboratory of Chemical Analysis, Hamburg University of Technology, Eissendorfer Str. 38, 21073, Hamburg, Germany
| | - Silvio Beier
- PFI Planungsgemeinschaft GbR, Am Werder 1, 21073, Hamburg, Germany
| | - Joachim Behrendt
- Institute of Wastewater Management and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073, Hamburg, Germany
| | - Holger Gulyas
- Institute of Wastewater Management and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073, Hamburg, Germany.
| | - Ralf Otterpohl
- Institute of Wastewater Management and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073, Hamburg, Germany
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Pang X, Qi J, Zhang Y, Ren Y, Su M, Jia B, Wang Y, Wei Q, Du B. Ultrasensitive photoelectrochemical aptasensing of miR-155 using efficient and stable CH3NH3PbI3 quantum dots sensitized ZnO nanosheets as light harvester. Biosens Bioelectron 2016; 85:142-50. [PMID: 27162145 DOI: 10.1016/j.bios.2016.04.099] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/28/2016] [Accepted: 04/29/2016] [Indexed: 11/22/2022]
Abstract
An ultrasensitive photoelectrochemical (PEC) aptasensor based on a novel signal amplification strategy was developed for the quantitative determination of microRNA (miR)-155. CH3NH3PbI3 quantum dots (QDs) functionalized ZnO nanosheets (NSs) were employed as the light harvester. Owing to the synergetic effect between CH3NH3PbI3 QDs and ZnO NSs, ZnO@CH3NH3PbI3 can provide an obviously increasing PEC signal by forming the heterojunction. Due to the larger steric hindrance, the sensitive decrease of the PEC signal can be achieved by the specific recognition between the primers and ssDNA of miR-155. In this sense, this developed aptasensor can achieve a high sensitivity (especially in the presence of the low concentrations of miR-155) and a wide detection range (0.01fmol/L to 20,000pmol/L). Under the optimal conditions, the proposed aptasensor offered an ultrasensitive and specific determination of miR-155 down to 0.005fmol/L. This aptassay method would open up a new promising platform at ultralow levels for early diagnose of different miRNA.
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DeAngelis AD, Kemp KC, Gaillard N, Kim KS. Antimony(III) Sulfide Thin Films as a Photoanode Material in Photocatalytic Water Splitting. ACS Appl Mater Interfaces 2016; 8:8445-8451. [PMID: 27003726 DOI: 10.1021/acsami.5b12178] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
For the first time, we present exploratory investigations on the performance of thermally evaporated Sb2S3 thin film photoanodes for solar-assisted water-splitting applications. With a band gap of 1.72 eV, a 250 nm thick Sb2S3 photoanode showed a saturation photocurrent density of ∼600 μA cm(-2) measured at 1.0 V reversible hydrogen electrode (RHE) in 0.1 M Na2SO4 under 1-sun illumination, with an onset potential of ∼0.25 V RHE. However, subsequent photodegradation studies revealed that the material dissolves relatively quickly with the application of both illumination and bias. Nonetheless, Sb2S3 does have the advantage of having a relatively low optimal fabrication temperature of 300 °C and thus may have utility as a top cell absorber of a tandem device where the bottom cell is temperature sensitive, if protected from corrosion. Therefore, we characterized relevant aspects of the material in an attempt to explain the large difference between the theoretical maximum and measured current density. From our characterization it is believed that the photocatalytic efficiency of this material can be improved by modifying the surface to reduce optical reflection and addressing inherent issues such as high electrical resistivity and surface defects.
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Affiliation(s)
- Alexander Daniel DeAngelis
- Center for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50, Ulsan 689-798, Korea
- Hawaii Natural Energy Institute, University of Hawaii , 1680 East-West Road Post 109, Honolulu, Hawaii 96822, United States
| | - Kingsley Christian Kemp
- Center for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50, Ulsan 689-798, Korea
- Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology , Pohang 790-784, Korea
| | - Nicolas Gaillard
- Hawaii Natural Energy Institute, University of Hawaii , 1680 East-West Road Post 109, Honolulu, Hawaii 96822, United States
| | - Kwang S Kim
- Center for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50, Ulsan 689-798, Korea
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Daouk S, Chèvre N, Vernaz N, Widmer C, Daali Y, Fleury-Souverain S. Dynamics of active pharmaceutical ingredients loads in a Swiss university hospital wastewaters and prediction of the related environmental risk for the aquatic ecosystems. Sci Total Environ 2016; 547:244-253. [PMID: 26789362 DOI: 10.1016/j.scitotenv.2015.12.117] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 12/22/2015] [Accepted: 12/23/2015] [Indexed: 06/05/2023]
Abstract
The wastewater contamination of a Swiss university hospital by active pharmaceutical ingredient (API) residues was evaluated with a three months monitoring campaign at the outlet of the main building. Flow-proportional samples were collected with an automatic refrigerated sampler and analyzed for 15 API, including antibiotics, analgesics, antiepileptic and anti-inflammatory drugs, by using a validated LC-MS/MS method. The metals Gd and Pt were also analyzed using ICP-MS. Measured concentrations were compared to the predicted ones calculated after the drug average consumption data obtained from the hospital pharmacy. The hospital contribution to the total urban load was calculated according to the consumption data obtained from city pharmacies. Lastly, the environmental hazard and risk quotients (RQ) related to the hospital fraction and the total urban consumption were calculated. Median concentrations of the 15 selected compounds were ranging from 0.04 to 675 μg/L, with a mean detection frequency of 84%. The ratio between predicted and measured environmental concentrations (PEC/MEC) has shown a good accuracy for 5 out of 15 compounds, revealing over- and under-estimations of the PEC model. Mean daily loads were ranging between 0.01 and 14.2g/d, with the exception of paracetamol (109.7 g/d). The hospital contribution to the total urban loads varied from 2.1 to 100% according to the compound. While taking into account dilution and removal efficiencies in wastewater treatment plant, only the hospital fraction of the antibiotics ciprofloxacin and sulfamethoxazole showed, respectively, a high (RQ>1) and moderate (RQ>0.1) risk for the aquatic ecosystems. Nevertheless, when considering the total urban consumption, 7 compounds showed potential deleterious effects on aquatic organisms (RQ>1): gabapentin, sulfamethoxazole, ciprofloxacin, piperacillin, ibuprofen, diclofenac and mefenamic acid. In order to reduce inputs of API residues originating from hospitals various solutions can be envisioned. With results of the present study, hospital managers can start handling this important issue.
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Affiliation(s)
- Silwan Daouk
- Geneva University Hospitals (HUG), Pharmacy, 4 Rue Gabrielle Perret-Gentil, 1211 Geneva 14, Switzerland.
| | - Nathalie Chèvre
- University of Lausanne (UNIL), Institute of Earth Surface Dynamics, Geopolis, CH-1015 Lausanne, Switzerland
| | - Nathalie Vernaz
- Geneva University Hospitals (HUG), Medical Direction and Quality, 4 Rue Gabrielle Perret-Gentil, 1211 Geneva 14, Switzerland
| | - Christèle Widmer
- Geneva University, University Center of Legal Medicine (CUMRL), Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Youssef Daali
- Geneva University Hospitals (HUG), Clinical Pharmacology and Toxicology, 4 Rue Gabrielle Perret-Gentil, 1211 Geneva 14, Switzerland
| | - Sandrine Fleury-Souverain
- Geneva University Hospitals (HUG), Pharmacy, 4 Rue Gabrielle Perret-Gentil, 1211 Geneva 14, Switzerland
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Minguez L, Pedelucq J, Farcy E, Ballandonne C, Budzinski H, Halm-Lemeille MP. Toxicities of 48 pharmaceuticals and their freshwater and marine environmental assessment in northwestern France. Environ Sci Pollut Res Int 2016; 23:4992-5001. [PMID: 25292303 DOI: 10.1007/s11356-014-3662-5] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 09/25/2014] [Indexed: 04/15/2023]
Abstract
A risk assessment for freshwater and marine ecosystems is presented for 48 pharmaceutical compounds, belonging to 16 therapeutic classes, and prescribed in northwestern France. Ecotoxicity data were obtained on two freshwater organisms, i.e., crustacean Daphnia magna and the green algae Pseudokirchneriella subcapitata, and on two marine organisms, i.e., the crustacean Artemia salina and the diatom Skeletonema marinoi. Measured environmental concentrations (MEC), in the Orne River and sea off Merville-Franceville in the Basse-Normandie region, were compared to the predicted environmental concentrations (PEC). Predicted no-effect concentrations (PNEC) were derived from acute data for each compound. Then, a risk assessment for each compound and the mixture was performed by calculating risk quotients (RQ as PEC or MEC/PNEC ratio). Results showed that no immediate acute toxicities were expected even if some compounds displayed strong toxicities at very low concentrations. Antibiotics, antidepressants, and antifungals would deserve attention because of their high or median ecological risk suspected on marine and freshwater ecosystems. Marine ecosystems would be more sensitive to pharmaceutical residues.
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Affiliation(s)
- Laetitia Minguez
- UMR BOREA (Biologie des ORganismes et Ecosystèmes Aquatiques), CNRS-7208/MNHN/UPMC/IRD-207/UCBN, Esplanade de la Paix, 14032, Caen Cedex, France.
- CERMN, UFR des Sciences Pharmaceutiques, UPRES EA4258 - FR CNRS INC3M - SF 4206 ICORE, Université de Caen Basse-Normandie, Bd Becquerel, 14032, Caen Cedex, France.
| | - Julie Pedelucq
- EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux), UMR 5805 CNRS, Laboratoire de Physico- et Toxico-Chimie de l'Environnement (LPTC), 351 crs de la Libération, 33405, Talence, France
| | - Emilie Farcy
- UMR BOREA (Biologie des ORganismes et Ecosystèmes Aquatiques), CNRS-7208/MNHN/UPMC/IRD-207/UCBN, Esplanade de la Paix, 14032, Caen Cedex, France
- CERMN, UFR des Sciences Pharmaceutiques, UPRES EA4258 - FR CNRS INC3M - SF 4206 ICORE, Université de Caen Basse-Normandie, Bd Becquerel, 14032, Caen Cedex, France
- Laboratoire Ecologie des Systèmes Marins Côtiers (ECOSYM), Université de Montpellier 2, UMR 5119, 34095, Montpellier, France
| | - Céline Ballandonne
- CERMN, UFR des Sciences Pharmaceutiques, UPRES EA4258 - FR CNRS INC3M - SF 4206 ICORE, Université de Caen Basse-Normandie, Bd Becquerel, 14032, Caen Cedex, France
| | - Hélène Budzinski
- EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux), UMR 5805 CNRS, Laboratoire de Physico- et Toxico-Chimie de l'Environnement (LPTC), 351 crs de la Libération, 33405, Talence, France
| | - Marie-Pierre Halm-Lemeille
- CERMN, UFR des Sciences Pharmaceutiques, UPRES EA4258 - FR CNRS INC3M - SF 4206 ICORE, Université de Caen Basse-Normandie, Bd Becquerel, 14032, Caen Cedex, France
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Zhu G, Lin T, Cui H, Zhao W, Zhang H, Huang F. Gray Ta2O5 Nanowires with Greatly Enhanced Photocatalytic Performance. ACS Appl Mater Interfaces 2016; 8:122-127. [PMID: 26670703 DOI: 10.1021/acsami.5b07685] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Black TiO2, with enhanced solar absorption and photocatalytic activity, has gained extensive attention, inspiring us to investigate the reduction of other wide-bandgap semiconductors for improved performance. Herein, we report the preparation of gray Ta2O5 nanowires with disordered shells and abundant defects via aluminum reduction. Its water decontamination is 2.5 times faster and hydrogen production is 2.3-fold higher over pristine Ta2O5. The reduced Ta2O5 also delivers significantly enhanced photoelectrochemical performance compared with the pristine Ta2O5 nanowires, including much higher carrier concentration, easier electron-hole separation and 11 times larger photocurrent. Our results demonstrate that Ta2O5 will have great potentials in photocatalysis and solar energy utilization after proper modification.
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Affiliation(s)
- Guilian Zhu
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P.R. China
| | - Tianquan Lin
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
| | - Houlei Cui
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P.R. China
| | - Wenli Zhao
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P.R. China
| | - Hui Zhang
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
| | - Fuqiang Huang
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P.R. China
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, P.R. China
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Voelker D, Schlich K, Hohndorf L, Koch W, Kuehnen U, Polleichtner C, Kussatz C, Hund-Rinke K. Approach on environmental risk assessment of nanosilver released from textiles. Environ Res 2015; 140:661-72. [PMID: 26073205 DOI: 10.1016/j.envres.2015.05.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 04/22/2015] [Accepted: 05/11/2015] [Indexed: 05/14/2023]
Abstract
Based on the increased utilization of nanosilver (silver nanomaterials=AgNM) as antibacterial agent, there is the strong need to assess the potential environmental implication associated with its new application areas. In this study an exemplary environmental risk assessment (ERA) of AgNM applied in textiles was performed. Environmental exposure scenarios (via municipal sewage treatment plant (STP)) with wastewater supply from domestic homes) were developed for three different types of textiles equipped with AgNM. Based on these scenarios predicted environmental concentrations (PECs) were deduced for STPs and for the environmental compartments surface water, sediment as well as soil. These PECs were related to PNECs (predicted no effect concentrations). PNECs were deduced from results of ecotoxicity tests of a selected AgNM (NM-300K). Data on ecotoxicology were derived from various tests with activated sludge, cyanobacteria, algae, daphnids, fish, duckweed, macrophytes, chironomids, earthworms, terrestrial plants as well as soil microorganisms. Emission data for the AgNM NM-300K from textiles were derived from washing experiments. The performed ERA was based on the specifications defined in the ECHA Guidances on information requirements and chemical safety assessment. Based on the chosen scenarios and preconditions, no environmental risk of the AgNM NM-300K released from textiles was detected. Under conservative assumptions a risk quotient for surface water close to 1 indicated that the aquatic compartment may be affected by an increased emission of AgNM to the environment due to the high sensitivity of aquatic organisms to silver. Based on the successful retention of AgNM in the sewage sludge and the still ongoing continual application of sewage sludge on farmland it is recommended to introduce a threshold for total silver content in sewage sludge into the respective regulations. Regarding potential risk mitigation measures, it is emphasized to preferably directly introduce AgNM into the textile fiber since this will strongly minimize the release of AgNM during washing. If this is not possible due to technical limitations or other reasons, the introduction of a threshold level controlling the release of AgNM from textiles is suggested. It has to be noted that this study is a case study which is only valid for the investigated NM-300K and its potential application in textiles.
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Affiliation(s)
- Doris Voelker
- Federal Environment Agency Germany, Section IV 2.2, Wörlitzer Platz 1, 06844 Dessau-Rosslau, Germany.
| | - Karsten Schlich
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Ecotoxicology, Auf dem Aberg 1, 57392 Schmallenberg, Germany
| | - Lars Hohndorf
- Federal Environment Agency Germany, Section IV 2.2, Wörlitzer Platz 1, 06844 Dessau-Rosslau, Germany
| | - Wolfgang Koch
- Federal Environment Agency Germany, Section IV 2.2, Wörlitzer Platz 1, 06844 Dessau-Rosslau, Germany
| | - Ute Kuehnen
- Federal Environment Agency Germany, Section IV 2.2, Wörlitzer Platz 1, 06844 Dessau-Rosslau, Germany
| | - Christian Polleichtner
- Federal Environment Agency Germany, Section IV 2.4, Schichauweg 58, 12307 Berlin, Germany
| | - Carola Kussatz
- Federal Environment Agency Germany, Section IV 2.4, Schichauweg 58, 12307 Berlin, Germany
| | - Kerstin Hund-Rinke
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Ecotoxicology, Auf dem Aberg 1, 57392 Schmallenberg, Germany
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Weeber F, Koudijs MJ, Hoogstraat M, Besselink NJM, VAN Lieshout S, Nijman IJ, Cuppen E, Offerhaus GJ, Voest EE. Effective Therapeutic Intervention and Comprehensive Genetic Analysis of mTOR Signaling in PEComa: A Case Report. Anticancer Res 2015; 35:3399-3403. [PMID: 26026101] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
BACKGROUND/AIM Perivascular epithelioid cell tumors (PEComas) are rare mesenchymal neoplasms. The exact genetic alterations underlying the pathophysiology of PEComas are largely unknown, although it has been shown that activation of the Mammalian target of rapamycin (mTOR) signaling pathway plays a pivotal role. Herein we describe the successful treatment of a patient with metastatic PEComa with the mTOR inhibitor everolimus and a comprehensive analysis to identify mechanisms for response. MATERIALS AND METHODS Immunohistochemistry, array comparative genomic hybridization (aCGH) and genetic analyses were performed. RESULTS Immunohistochemistry confirmed constitutive activation of mTOR. aCGH revealed a hyperdiploid karyotype affecting large regions of the genome. Next-generation sequencing did not reveal any tumor-specific mutations in mTOR-related genes. CONCLUSION Our results show the complexity of determining causal genetic alterations that can predict responsiveness to mTOR inhibition, even for a tumor with a complete remission to this specific treatment.
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Affiliation(s)
- Fleur Weeber
- Department of Molecular Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Marco J Koudijs
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Marlous Hoogstraat
- Department of Molecular Carcinogenesis, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Nicolle J M Besselink
- Department of Medical Oncology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Stef VAN Lieshout
- Department of Pathology, VU Medical Center, Amsterdam, the Netherlands
| | - Isaac J Nijman
- Hubrecht Institute, Utrecht, The Netherlands Department of Human Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Edwin Cuppen
- Hubrecht Institute, Utrecht, The Netherlands Department of Human Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - G Johan Offerhaus
- Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Emile E Voest
- Department of Molecular Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
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Warwick MEA, Kaunisto K, Barreca D, Carraro G, Gasparotto A, Maccato C, Bontempi E, Sada C, Ruoko TP, Turner S, Van Tendeloo G. Vapor Phase Processing of α-Fe₂O₃ Photoelectrodes for Water Splitting: An Insight into the Structure/Property Interplay. ACS Appl Mater Interfaces 2015; 7:8667-8676. [PMID: 25853179 DOI: 10.1021/acsami.5b00919] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Harvesting radiant energy to trigger water photoelectrolysis and produce clean hydrogen is receiving increasing attention in the search of alternative energy resources. In this regard, hematite (α-Fe2O3) nanostructures with controlled nano-organization have been fabricated and investigated for use as anodes in photoelectrochemical (PEC) cells. The target systems have been grown on conductive substrates by plasma enhanced-chemical vapor deposition (PE-CVD) and subjected to eventual ex situ annealing in air to further tailor their structure and properties. A detailed multitechnique approach has enabled to elucidate the interrelations between system characteristics and the generated photocurrent. The present α-Fe2O3 systems are characterized by a high purity and hierarchical morphologies consisting of nanopyramids/organized dendrites, offering a high contact area with the electrolyte. PEC data reveal a dramatic response enhancement upon thermal treatment, related to a more efficient electron transfer. The reasons underlying such a phenomenon are elucidated and discussed by transient absorption spectroscopy (TAS) studies of photogenerated charge carrier kinetics, investigated on different time scales for the first time on PE-CVD Fe2O3 nanostructures.
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Affiliation(s)
| | - Kimmo Kaunisto
- ‡Department of Chemistry and Bioengineering, Tampere University of Technology, 33101 Tampere, Finland
| | - Davide Barreca
- §CNR-IENI, Department of Chemistry, Padova University and INSTM, 35131 Padova, Italy
| | - Giorgio Carraro
- †Department of Chemistry, Padova University and INSTM, 35131 Padova, Italy
| | - Alberto Gasparotto
- †Department of Chemistry, Padova University and INSTM, 35131 Padova, Italy
| | - Chiara Maccato
- †Department of Chemistry, Padova University and INSTM, 35131 Padova, Italy
| | - Elza Bontempi
- ∥Chemistry for Technologies Laboratory, University of Brescia, 25123 Brescia, Italy
| | - Cinzia Sada
- ⊥Department of Physics and Astronomy, Padova University, 35131 Padova, Italy
| | - Tero-Petri Ruoko
- ‡Department of Chemistry and Bioengineering, Tampere University of Technology, 33101 Tampere, Finland
| | - Stuart Turner
- #EMAT, University of Antwerp, 2020 Antwerpen, Belgium
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Wei Y, Xia W, Ye X, Fan Y, Shi J, Wen W, Yang P, Li H. The antimicrobial protein short palate, lung, and nasal epithelium clone 1 (SPLUNC1) is differentially modulated in eosinophilic and noneosinophilic chronic rhinosinusitis with nasal polyps. J Allergy Clin Immunol 2014; 133:420-8. [DOI: 10.1016/j.jaci.2013.09.052] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 09/09/2013] [Accepted: 09/12/2013] [Indexed: 01/18/2023]
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Daughton CG. The Matthew Effect and widely prescribed pharmaceuticals lacking environmental monitoring: case study of an exposure-assessment vulnerability. Sci Total Environ 2014; 466-467:315-25. [PMID: 23911922 DOI: 10.1016/j.scitotenv.2013.06.111] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 06/26/2013] [Accepted: 06/26/2013] [Indexed: 05/23/2023]
Abstract
Assessing ambient exposure to chemical stressors often begins with time-consuming and costly monitoring studies to establish environmental occurrence. Both human and ecological toxicology are currently challenged by the unknowns surrounding low-dose exposure/effects, compounded by the reality that exposure undoubtedly involves mixtures of multiple stressors whose identities and levels can vary over time. Long absent from the assessment process, however, is whether the full scope of the identities of the stressors is sufficiently known. The Matthew Effect (a psychosocial phenomenon sometimes informally called the "bandwagon effect" or "iceberg effect," among others) may adversely bias or corrupt the exposure assessment process. The Matthew Effect is evidenced by decisions that base the selection of stressors to target in environmental monitoring surveys on whether they have been identified in prior studies, rather than considering the possibility that additional, but previously unreported, stressors might also play important roles in an exposure scenario. The possibility that the Matthew Effect might influence the scope of environmental stressor research is explored for the first time in a comprehensive case study that examines the preponderance of "absence of data" (in contrast to positive data and "data of absence") for the environmental occurrence of a very large class of potential chemical stressors associated with ubiquitous consumer use - active pharmaceutical ingredients (APIs). Comprehensive examination of the published data for an array of several hundred of the most frequently used drugs for whether their APIs are environmental contaminants provides a prototype example to catalyze discussion among the many disciplines involved with assessing risk. The findings could help guide the selection of those APIs that might merit targeting for environmental monitoring (based on the absence of data for environmental occurrence) as well as the prescribing of those medications that might have minimal environmental impact (based on data of absence for environmental occurrence).
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Affiliation(s)
- Christian G Daughton
- Environmental Sciences Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, 944 East Harmon Avenue, Las Vegas, NV 89119, USA.
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López-Roldán R, Jubany I, Martí V, González S, Cortina JL. Ecological screening indicators of stress and risk for the Llobregat river water. J Hazard Mater 2013; 263 Pt 1:239-247. [PMID: 23911059 DOI: 10.1016/j.jhazmat.2013.07.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/05/2013] [Accepted: 07/06/2013] [Indexed: 06/02/2023]
Abstract
The objective of this article is to develop and apply several simple and rough indicators for river aquatic ecosystems assessment in order to screen potential chemical stressors. Several indicators, based on toxicity (PNEC) and on legislation levels (EQS) have been developed. All these indicators are ratios that were calculated by using public and private data of concentrations of a large list of compounds during a period of five years, including metals and organic compounds in the lower part of the Llobregat river basin at the intake of the drinking water treatment plant. Additionally, new campaigns were executed for increasing the information available on the presence of compounds not routinely analyzed, such as some other pesticides and pharmaceuticals. In the case of inorganic pollutants, the indicators obtained in this river section showed significant risk especially for zinc, but also for copper, nickel and barium. For organic pollutants, the pesticides terbuthylazine, diazinon, 2-methyl-4-chlorophenoxyacetic (MCPA), and in a few cases, chlorpyrifos and lindane, also showed indexes above the threshold. Among the pharmaceuticals, the antibiotics clarithromycin and ciprofloxacin were the only ones with risk indicators adverse to ecosystems. The specific values of the indexes obtained rely on the quantity and quality of the data available, so their interpretation should take into account that some values can be high due to the use of too conservative toxicological information.
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Weber-Steffens D, Hunold K, Kürschner J, Martinez SG, Elumalai P, Schmidt D, Trevani A, Runza VL, Männel DN. Immature mouse granulocytic myeloid cells are characterized by production of ficolin-B. Mol Immunol 2013; 56:488-96. [PMID: 23911405 DOI: 10.1016/j.molimm.2013.06.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 06/21/2013] [Indexed: 12/01/2022]
Abstract
Ficolins activate the lectin pathway of the complement system upon binding to carbohydrate patterns on pathogens. To characterize the producer cells of ficolin-B the expression of mouse ficolin-B, the orthologue of human M-ficolin, was studied in macrophages and dendritic cells during differentiation from bone marrow cells, in primary granulocytes, and during differentiation of granulocytes derived from ER-Hoxb8 cells. Expression of ficolin-B mRNA declined in all myeloid cell types to low levels during terminal differentiation. However, in contrast to macrophages and dendritic cells, ficolin-B expression was enhanced upon activation in granulocytes. High expression of ficolin-B was observed in primary immature neutrophilic CD11b(+) Ly-6C(int) Ly-6G(high) granulocytes when isolated from the bone marrow, in particular during sepsis. Ficolin-B was demonstrated in lysates of primary granulocytes, ER-Hoxb8-derived granulocytes, bone marrow-derived macrophages, and dendritic cells. Native ficolin-B from cell lysates and supernatants of granulocytes activated the lectin pathway as measured by binding to MASP-2 and inducing C4 deposition. Specific staining demonstrated intra-cellular or cell associated ficolin-B protein in activated immature granulocytes deposited in a granular fashion. This study shows that ficolin-B is stored in and set free from immature granulocytic myeloid cells indicating a role in the early infection-induced cellular response of these inflammatory cells.
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Li J, Lv S, Liu Y, Bai J, Zhou B, Hu X. Photoeletrocatalytic activity of an n-ZnO/p-Cu2O/n-TNA ternary heterojunction electrode for tetracycline degradation. J Hazard Mater 2013; 262:482-488. [PMID: 24076571 DOI: 10.1016/j.jhazmat.2013.09.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 08/29/2013] [Accepted: 09/03/2013] [Indexed: 06/02/2023]
Abstract
In this study, a novel ternary heterojunction n-ZnO/p-Cu2O/n-TiO2 nanotube arrays (n-ZnO/p-Cu2O/n-TNA) nanophotocatalyst with a sandwich-like nanostructure was constructed and applied for the photoelectrocatalytic (PEC) degradation of typical PPCPs, tetracycline (TC). The ternary heterojunction n-ZnO/p-Cu2O/n-TNA was obtained by depositing Cu2O on the surface of TNA via sonoelectrochemical deposition (SED) and subsequently building a layer of ZnO onto the p-Cu2O/n-TNA surface through hydrothermal synthesis. After being deposited by the Cu2O, the absorption-band edge of the p-Cu2O/n-TNA was obviously red-shifted to the visible region (to 505 nm), and the band gap was reduced from its original 3.20 eV to 2.46 eV. The band gap absorption edge of the ternary n-ZnO/p-Cu2O/n-TNA is similar to that of p-Cu2O/n-TN and extends the visible spectrum absorption to 510 nm, corresponding to an Eg value of about 2.43 eV. Under illumination of visible light, the photocurrent density of the ternary heterojunction n-ZnO/p-Cu2O/n-TNA electrode at 0.5 V (vs. Ag/AgCl) was more than 106 times as high as that of the pure TNAs electrode, 3.6 times as high as that of the binary heterojunction p-Cu2O/n-TNA electrode. The degradation of TC indicated that the ternary heterojunction n-ZnO/p-Cu2O/n-TNA electrode maintained a very high photoelectrocatalytic activity and excellent stability and reliability. Such kind of ternary heterojunction electrode material has a broad application prospect not only in pollution control but also in many other fields.
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Affiliation(s)
- Jinhua Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd, Shanghai 200240, China
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Sweeney IR, Miraftab M, Collyer G. Absorbent alginate fibres modified with hydrolysed chitosan for wound care dressings--II. Pilot scale development. Carbohydr Polym 2013; 102:920-7. [PMID: 24507364 DOI: 10.1016/j.carbpol.2013.10.053] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 10/11/2013] [Accepted: 10/12/2013] [Indexed: 10/26/2022]
Abstract
Fibres have been used extensively in wound dressing applications as they provide a high surface area for absorption, ease of fabrication and softness. It is common practice for commercial wound dressings to be produced from natural materials, such a marine polysaccharides, as they are predominantly biocompatible, non-toxic, and often display bioactive properties, such as inherent antimicrobial activity. In this study hydrolysed chitosans were utilised as a sole coagulant for the production of alginate-chitosan fibres via a one-step, direct wet-spinning extrusion process. The levels of chitosan incorporated into the fibres were analysed quantitatively via elemental analysis and qualitatively by staining using Amido Black 10B. It was estimated that the fibres contained between 4.50 and 5.10% (wt.%) chitosan. The presence of chitosan improved tensile properties such as elongation and tenacity of the base alginate fibres. The increased incorporation of chitosan into the fibres also improved the absorption of the fibres in both saline and distilled water; reaching maximum of >30 g/g and >50 g/g, respectively. This work suggests that the observed hydrolysed chitosan content within the fibre may be optimal for the preparation of a novel fibre for wound care application.
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Affiliation(s)
- I R Sweeney
- Institute for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL3 5AB, UK.
| | - M Miraftab
- Institute for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL3 5AB, UK
| | - G Collyer
- Sumed International (UK) Limited, Integrity House, Units 1-2 Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QH, UK
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Mackern-Oberti JP, Motrich RD, Breser ML, Sánchez LR, Cuffini C, Rivero VE. Chlamydia trachomatis infection of the male genital tract: an update. J Reprod Immunol 2013; 100:37-53. [PMID: 23870458 DOI: 10.1016/j.jri.2013.05.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 04/03/2013] [Accepted: 05/06/2013] [Indexed: 12/30/2022]
Abstract
Chlamydia trachomatis (CT) is the most prevalent cause of sexually transmitted diseases. Although the prevalence of chlamydial infection is similar in men and women, current research and screening are still focused on women, who develop the most severe complications, leaving the study of male genital tract (MGT) infection underrated. Herein, we reviewed the literature on genital CT infection with special focus on the MGT. Data indicate that CT certainly infects different parts of the MGT such as the urethra, seminal vesicles, prostate, epididymis and testis. However, whether or not CT infection has detrimental effects on male fertility is still controversial. The most important features of CT infection are its chronic nature and the presence of a mild inflammation that remains subclinical in most individuals. Chlamydia antigens and pathogen recognition receptors (PRR), expressed on epithelial cells and immune cells from the MGT, have been studied in the last years. Toll-like receptor (TLR) expression has been observed in the testis, epididymis, prostate and vas deferens. It has been demonstrated that recognition of chlamydial antigens is associated with TLR2, TLR4, and possibly, other PRRs. CT recognition by PRRs induces a local production of cytokines/chemokines, which, in turn, provoke chronic inflammation that might evolve in the onset of an autoimmune process in genetically susceptible individuals. Understanding local immune response along the MGT, as well as the crosstalk between resident leukocytes, epithelial, and stromal cells, would be crucial in inducing a protective immunity, thus adding to the design of new therapeutic approaches to a Chlamydia vaccine.
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Kleinberger RM, Burke NAD, Dalnoki-Veress K, Stöver HDH. Systematic study of alginate-based microcapsules by micropipette aspiration and confocal fluorescence microscopy. Mater Sci Eng C Mater Biol Appl 2013; 33:4295-304. [PMID: 23910346 DOI: 10.1016/j.msec.2013.06.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 05/09/2013] [Accepted: 06/19/2013] [Indexed: 12/24/2022]
Abstract
Micropipette aspiration and confocal fluorescence microscopy were used to study the structure and mechanical properties of calcium alginate hydrogel beads (A beads), as well as A beads that were additionally coated with poly-L-lysine (P) and sodium alginate (A) to form, respectively, AP and APA hydrogels. A beads were found to continue curing for up to 500 h during storage in saline, due to residual calcium chloride carried over from the gelling bath. In subsequent saline washes, micropipette aspiration proved to be a sensitive indicator of gel weakening and calcium loss. Aspiration tests were used to compare capsule stiffness before and after citrate extraction of calcium. They showed that the initial gel strength is largely due to the calcium alginate gel cores, while the long term strength is solely due to the poly-L-lysine-alginate polyelectrolyte complex (PEC) shells. Confocal fluorescence microscopy showed that calcium chloride exposure after PLL deposition led to PLL redistribution into the hydrogel bead, resulting in thicker but more diffuse and weaker PEC shells. Adding a final alginate coating to form APA capsules did not significantly change the PEC membrane thickness and stiffness, but did speed the loss of calcium from the bead core.
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Affiliation(s)
- Rachelle M Kleinberger
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1,Canada
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Esheba GES, Esheba NES. Angiomyolipoma of the kidney: clinicopathological and immunohistochemical study. J Egypt Natl Canc Inst 2013; 25:125-34. [PMID: 23932749 DOI: 10.1016/j.jnci.2013.05.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 05/03/2013] [Accepted: 05/14/2013] [Indexed: 11/29/2022] Open
Abstract
OVERVIEW Although angiomyolipoma (AML) is a relatively rare entity, it is the most common benign mesenchymal neoplasm of the kidney. THE AIM OF THIS STUDY To highlight the clinicopathological characteristics of AML and to assess the role of Human Melanoma Black-45 (HMB-45), Melan-A, smooth muscle actin (SMA), S-100 and cytokeratin in its diagnosis. MATERIALS AND METHODS The study included 15 cases of AML. Clinical and radiological data were retrieved from the archival files and all cases were subjected to a histopathological evaluation as well as immunohistochemical staining for HMB-45, Melan-A, SMA, S-100, and cytokeratin. RESULTS AML was more common in females (female:male = 4:1), the mean age was 53.9 ± 6.45 years. 60% of patients were symptomatic while the remaining 40% were asymptomatic. A statistically significant relationship was found between size of the tumor and the presence of the symptoms (P = 0.02). Patients with tumor size less than 4 cm were asymptomatic, while those with tumor size larger than 4 cm had different symptoms. Thirteen cases were classic AML, while 2 cases were epithelioid AML. Classic AML demonstrated admixture of fatty tissue, thick-walled blood vessels, and smooth muscle, while epithelioid AML was composed mainly of epithelioid cells and contained no fat. HMB-45 was positive in all cases of AML (100%), Melan-A was positive in 13/15 (87%) while SMA was positive in 11/15 (73%) of AML with variable staining intensity. All cases of AML were negative for S-100 and cytokeratin. CONCLUSION AMLs have characteristic clinicopathological and immunohistochemical features and their recognition is crucial for proper diagnosis and treatment.
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