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Masunaga SI, Sanada Y, Takata T, Tanaka H, Sakurai Y, Suzuki M, Kirihata M, Ono K. The impact of TP53 status of tumor cells including the type and the concentration of administered 10B delivery agents on compound biological effectiveness in boron neutron capture therapy. J Radiat Res 2023; 64:399-411. [PMID: 36763853 PMCID: PMC10036103 DOI: 10.1093/jrr/rrad001] [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] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/23/2022] [Indexed: 06/18/2023]
Abstract
Human head and neck squamous cell carcinoma cells transfected with mutant TP53 (SAS/mp53) or neo vector (SAS/neo) were inoculated subcutaneously into left hind legs of nude mice. After the subcutaneous administration of a 10B-carrier, boronophenylalanine-10B (BPA) or sodium mercaptododecaborate-10B (BSH), at two separate concentrations, the 10B concentrations in tumors were measured using γ-ray spectrometry. The tumor-bearing mice received 5-bromo-2'-deoxyuridine (BrdU) continuously to label all intratumor proliferating (P) tumor cells, then were administered with BPA or BSH. Subsequently, the tumors were irradiated with reactor neutron beams during the time of which 10B concentrations were kept at levels similar to each other. Following irradiation, cells from some tumors were isolated and incubated with a cytokinesis blocker. The responses of BrdU-unlabeled quiescent (Q) and total (= P + Q) tumor cells were assessed based on the frequencies of micronucleation using immunofluorescence staining for BrdU. In both SAS/neo and SAS/mp53 tumors, the compound biological effectiveness (CBE) values were higher in Q cells and in the use of BPA than total cells and BSH, respectively. The higher the administered concentrations were, the smaller the CBE values became, with a clearer tendency in SAS/neo tumors and the use of BPA than in SAS/mp53 tumors and BSH, respectively. The values for BPA that delivers into solid tumors more dependently on uptake capacity of tumor cells than BSH became more alterable. Tumor micro-environmental heterogeneity might partially influence on the CBE value. The CBE value can be regarded as one of the indices showing the level of intratumor heterogeneity.
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Affiliation(s)
- Shin-ichiro Masunaga
- Corresponding author. 1-1-48-4601, Fukushima, Fukushima-ku, Osaka, Osaka 553-0003, Japan. E-mail:
| | - Yu Sanada
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0458, Japan
| | - Takushi Takata
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0458, Japan
| | - Hiroki Tanaka
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0458, Japan
| | - Yoshinori Sakurai
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0458, Japan
| | - Minoru Suzuki
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0458, Japan
| | - Mitsunori Kirihata
- Research Center for Boron Neutron Capture Therapy, Osaka Metropolitan University, Sakai, Osaka, 599-8531, Japan
| | - Koji Ono
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, 569-0801, Japan
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Lin F, Qi Q, Zhang J, Zhou W, Zhang J, Fu P, Zhang X, Qiao X, Liu M, Pang X, Cui Z. From Unimolecular Template to Silver Nanocrystal Clusters: An Effective Strategy to Balance Antibacterial Activity and Cytotoxicity. ACS Appl Mater Interfaces 2021; 13:39806-39818. [PMID: 34387459 DOI: 10.1021/acsami.1c07986] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Silver nanomaterials have attracted a great deal of interest due to their broad-spectrum antimicrobial activity. However, it is still challenging to balance the high antibacterial efficiency with low damage to biological cells of silver nanostructures, especially when the diameter decreases to less than 10 nm. Here, we developed a new type of Ag nanohybrid material via a unimolecular micelle template method, which presents amazing antibacterial activities and almost noncytotoxicity. First, water-soluble multiarm star-shaped brushlike copolymer α-CD-g-[(PEO40-g-PAA50)-b-PEO5]18 was precisely synthesized and its micelle behavior in different solvents was revealed. Then, nanocrystal clusters assembled by Ag grains (Ag@Template NCs) were prepared through an in situ redox route using the unimolecular micelle of α-CD-g-[(PEO40-g-PAA50)-b-PEO5]18 as the soft template, AgNO3 as a precursor, and tetrabutylammonium borohydride (TBAB) as the reducing agent. The overall size of the achieved Ag@Template NCs is controlled by the template structure at around 40 nm (Dh in DMF), and the size of the Ag grain can be easily regulated from ∼1 to ∼5 nm by adjusting the feeding ratio of AgNO3/acrylic acid (AA) units in the template from 1:10 to 1:1. Benefitting from the structural design of the template, all Ag@Template NCs prepared here exhibit excellent dispersibility and chemical stability in different aqueous environments (neutral, pH = 5.5, and 0.9% NaCl physiological saline solution), which play a crucial role in the long-term storage and potential application in a complex physiological environment. The antibacterial and cytotoxicity tests indicate that Ag@Template NCs display much better performance than Ag nanoparticles (Ag NPs), which have a comparable overall size of ∼25 nm. The inhibitory capability of Ag@Template NCs to bacteria strongly depends on the grain size. Specifically, the Ag@Template-1 NC assembled by the smallest grains (1.6 ± 0.3 nm) presents the best antibacterial activity. For E. coli (-), the MIC value is as low as 5 μg/mL (0.36 μg/mL of Ag), while for S. aureus (+), the value is around 10 μg/mL (0.72 μg/mL of Ag). The survival rate of L02 cells and lactate dehydrogenase assay together illustrate the low cytotoxicity possessed by the prepared Ag@Template NCs. Therefore, the proposed Ag@Template NC structure successfully resolves the high reactivity, instability, and fast oxidation issues of the ultrasmall Ag nanoparticles, and integrates high antibacterial efficiency and nontoxicity to biological cells into one platform, which implies its broad potential application in biomedicine.
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Affiliation(s)
- Fangke Lin
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Qianqian Qi
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Junle Zhang
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Wenjun Zhou
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Jiahui Zhang
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Peng Fu
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaomeng Zhang
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaoguang Qiao
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Minying Liu
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Xinchang Pang
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
| | - Zhe Cui
- School of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, China
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Solovjeva ON. The mechanism of a one-substrate transketolase reaction. Part II. Anal Biochem 2020; 613:114022. [PMID: 33217405 DOI: 10.1016/j.ab.2020.114022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 11/15/2022]
Abstract
In a recent paper, we showed the difference between the first stage of the one-substrate and the two-substrate transketolase reactions - the possibility of transfer of glycolaldehyde formed as a result of cleavage of the donor substrate from the thiazole ring of thiamine diphosphate to its aminopyrimidine ring through the tricycle formation stage, which is necessary for binding and splitting the second molecule of donor substrate [O.N. Solovjeva et al., The mechanism of a one-substrate transketolase reaction, Biosci. Rep. 40 (8) (2020) BSR20180246]. Here we show that under the action of the reducing agent a tricycle accumulates in a significant amount. Therefore, a significant decrease in the reaction rate of the one-substrate transketolase reaction compared to the two-substrate reaction is due to the stage of transferring the first glycolaldehyde molecule from the thiazole ring to the aminopyrimidine ring of thiamine diphosphate. Fragmentation of the four-carbon thiamine diphosphate derivatives showed that two glycolaldehyde molecules are bound to both coenzyme rings and the erythrulose molecule is bound to a thiazole ring. It was concluded that in the one-substrate reaction erythrulose is formed on the thiazole ring of thiamine diphosphate from two glycol aldehyde molecules linked to both thiamine diphosphate rings. The kinetic characteristics were determined for the two substrates, fructose 6-phosphate and glycolaldehyde.
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Affiliation(s)
- Olga N Solovjeva
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992, Moscow, Russian Federation.
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Safronov SV, Osipova ES, Nelyubina YV, Filippov OA, Barakovskaya IG, Belkova NV, Shubina ES. Steric and Electronic Effect of Cp-Substituents on the Structure of the Ruthenocene Based Pincer Palladium Borohydrides. Molecules 2020; 25:molecules25092236. [PMID: 32397552 PMCID: PMC7248887 DOI: 10.3390/molecules25092236] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/06/2020] [Accepted: 05/07/2020] [Indexed: 12/12/2022] Open
Abstract
Ruthenocene-based PCPtBu pincer ligands were used to synthesize novel pincer palladium chloride RcF[PCPtBu]PdCl (2a) and two novel palladium tetrahydroborates RcF[PCPtBu]Pd(BH4) (3a) and Rc*[PCPtBu]Pd(BH4) (3b), where RcF[PCPtBu] = κ3-{2,5-(tBu2PCH2)2-C5H2}Ru(CpF) (CpF = C5Me4CF3), and Rc*[PCPtBu] = κ3-{2,5-(tBu2PCH2)2C5H2}Ru(Cp*) (Cp* = C5Me5). These coordination compounds were characterized by X-ray, NMR and FTIR techniques. Analysis of the X-ray data shows that an increase of the steric bulk of non-metalated cyclopentadienyl ring in 3a and 3b relative to non-substituted Rc[PCPtBu]Pd(BH4) analogue (3c; where Rc[PCPtBu] = κ3-{2,5-(tBu2PCH2)2C5H2}Ru(Cp), Cp = C5H5) pushes palladium atom from the middle plane of the metalated Cp ring in the direction opposite to the ruthenium atom. This displacement increases in the order 3c < 3b < 3a following the order of the Cp-ring steric volume increase. The analysis of both X-ray and IR data suggests that BH4 ligand in both palladium tetrahydroborates 3a and 3b has the mixed coordination mode η1,2. The strength of the BH4 bond with palladium atom increases in the order Rc[PCPtBu]Pd(BH4) < Rc*[PCPtBu]Pd(BH4) < RcF[PCPtBu]Pd(BH4) that appears to be affected by both steric and electronic properties of the ruthenocene moiety.
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Llamas Jansa I, Kalantzopoulos GN, Nordholm K, Hauback BC. Destabilization of NaBH 4 by Transition Metal Fluorides. Molecules 2020; 25:E780. [PMID: 32059356 PMCID: PMC7070751 DOI: 10.3390/molecules25040780] [Citation(s) in RCA: 8] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 01/22/2020] [Accepted: 02/05/2020] [Indexed: 11/16/2022] Open
Abstract
In order to improve the suitability of NaBH4 as a clean fuel, its decomposition temperature needs to be decreased to below 535 °C, while its hydrogen release must be as high as possible. In this work, the influence of a collection of first and second period transition metal fluorides on the destabilization of NaBH4 is studied on samples produced by ball milling NaBH4 with 2 mol% of a metal fluoride additive. The effects obtained by increasing additive amount and changing oxidation state are also evaluated for NbF5, CeF3, and CeF4. The as-milled products are characterized by in-house power X-ray diffraction, while the hydrogen release and decomposition are monitored by temperature programmed desorption with residual gas analysis, differential scanning calorimetry, and thermogravimetry. The screening of samples containing 2 mol% of additive shows that distinctive groups of transition metal fluorides affect the ball milling process differently depending on their enthalpy of formation, melting point, or their ability to react at the temperatures achieved during ball milling. This leads to the formation of NaBF4 in the case of TiF4, MnF3, VF4, CdF2, NbF5, AgF, and CeF3 and the presence of the metal in CrF3, CuF2, and AgF. There is no linear correlation between the position of the transition metal in the periodic table and the observed behavior. The thermal behavior of the products after milling is given by the remaining NaBH4, fluoride, and the formation of intermediate metastable compounds. A noticeable decrease of the decomposition temperature is seen for the majority of the products, with the exceptions of the samples containing YF3, AgF, and CeF3. The largest decrease of the decomposition temperature is observed for NbF5. When comparing increasing amounts of the same additive, the largest decrease of the decomposition temperature is observed for 10 mol% of NbF5. Higher amounts of additive result in the loss of the NaBH4 thermal signal and ultimately the loss of the crystalline borohydride. When comparing additives with the same transition metal and different oxidation states, the most efficient additive is found to be the one with a higher oxidation state. Furthermore, among all the samples studied, higher oxidation state metal fluorides are found to be the most destabilizing agents for NaBH4. Overall, the present study shows that there is no single parameter affecting the destabilization of NaBH4 by transition metal fluorides. Instead, parameters such as the transition metal electronegativity and oxidation state or the enthalpy of formation of the fluoride and its melting point are competing to influence the destabilization. In particular, it is found that the combination of a high metal oxidation state and a low fluoride melting point will enhance destabilization. This is observed for MnF3, NbF5, NiF2, and CuF2, which lead to high gas releases from the decomposition of NaBH4 at the lowest decomposition temperatures.
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Affiliation(s)
- Isabel Llamas Jansa
- Department for Neutron Characterization, Institute for Energy Technology, P.O. Box 40, NO-2027 Kjeller, Norway; (G.N.K.); (K.N.); (B.C.H.)
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Huggias S, Bolla PA, Serradell MA, Casella M, Peruzzo PJ. Platinum Nanoparticles Obtained at Mild Conditions on S-Layer Protein/Polymer Particle Supports. Langmuir 2020; 36:1201-1211. [PMID: 31945296 DOI: 10.1021/acs.langmuir.9b02868] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This work presents the synthesis of platinum nanoparticles supported on S-layer protein/polymeric particle systems, obtained by combining proteins isolated from Lactobacillus kefiri and an aqueous dispersion of acrylic particles. FTIR spectra of the protein/polymer supports did not show changes in the Amide I band of the proteins, suggesting that proteins maintained their conformation after adsorption. The SAXS spectra and DLS results are consistent with the formation of a protein corona around the polymer particles. After combining the supports with the platinum complex and subsequently reducing the combination with hydrogen at mild conditions, we obtained colloidal nanocomposite materials. In these, platinum nanoparticles with diameters around 3 nm located on the surface of the protein/polymer supports were observed by TEM. The obtained nanosystems showed catalytic activity in the reduction of p-nitrophenol with NaBH4 at room temperature with conversions of 100% for reaction times of 50 to 70 min.
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Affiliation(s)
- Sofía Huggias
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco″ - CINDECA ( UNLP - CONICET CCT La Plata), Calle 47 N° 257 ( 1900 ) La Plata , Argentina
| | - Patricia A Bolla
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco″ - CINDECA ( UNLP - CONICET CCT La Plata), Calle 47 N° 257 ( 1900 ) La Plata , Argentina
| | - María A Serradell
- Cátedra de Microbiología, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas , Universidad Nacional de La Plata (UNLP) , 47 y 115 s/n ( 1900 ) La Plata , Argentina
- Universidad Nacional Arturo Jauretche - UNAJ , Av. Calchaquí 6200 ( 1888 ) Florencio Varela , Argentina
| | - Mónica Casella
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco″ - CINDECA ( UNLP - CONICET CCT La Plata), Calle 47 N° 257 ( 1900 ) La Plata , Argentina
| | - Pablo J Peruzzo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas - INIFTA (UNLP - CONICET CCT La Plata), Diag. 113 y 64 (B1904DPI) La Plata , CC 16 Suc 4 , Argentina
- Universidad Nacional Arturo Jauretche - UNAJ , Av. Calchaquí 6200 ( 1888 ) Florencio Varela , Argentina
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7
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Puszkiel J, Gasnier A, Amica G, Gennari F. Tuning LiBH 4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches. Molecules 2019; 25:molecules25010163. [PMID: 31906111 PMCID: PMC6982930 DOI: 10.3390/molecules25010163] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 12/11/2019] [Accepted: 12/21/2019] [Indexed: 02/04/2023] Open
Abstract
Hydrogen technology has become essential to fulfill our mobile and stationary energy needs in a global low–carbon energy system. The non-renewability of fossil fuels and the increasing environmental problems caused by our fossil fuel–running economy have led to our efforts towards the application of hydrogen as an energy vector. However, the development of volumetric and gravimetric efficient hydrogen storage media is still to be addressed. LiBH4 is one of the most interesting media to store hydrogen as a compound due to its large gravimetric (18.5 wt.%) and volumetric (121 kgH2/m3) hydrogen densities. In this review, we focus on some of the main explored approaches to tune the thermodynamics and kinetics of LiBH4: (I) LiBH4 + MgH2 destabilized system, (II) metal and metal hydride added LiBH4, (III) destabilization of LiBH4 by rare-earth metal hydrides, and (IV) the nanoconfinement of LiBH4 and destabilized LiBH4 hydride systems. Thorough discussions about the reaction pathways, destabilizing and catalytic effects of metals and metal hydrides, novel synthesis processes of rare earth destabilizing agents, and all the essential aspects of nanoconfinement are led.
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Affiliation(s)
- Julián Puszkiel
- Correspondence: ; Tel.: +54-294-4445118; Fax: +54-294-4445290
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8
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Hamzavi SF, Jamili S, Yousefzadi M, Mashinchian Moradi A, Amrollahi Biuki N. Immobilization of platinum nanoparticles on the functionalized chitosan particles: an efficient catalyst for reduction of nitro compounds and tandem reductive Ugi reactions. Mol Divers 2019; 24:985-995. [PMID: 31667649 DOI: 10.1007/s11030-019-10007-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 08/21/2019] [Accepted: 10/17/2019] [Indexed: 01/29/2023]
Abstract
In this work, we reported a facile synthesis of Pt nanoparticles (NPs) on proline-functionalized cross-linked chitosan particles to catalyze the reduction of R-NO2 to R-NH2 in aqueous medium using sodium borohydride. Chitosan was functionalized with (3-bromopropyl)proline and cross-linked with glutaraldehyde for the synthesis of chitosan NPs. The platinum NPs was prepared on the chitosan NPs. This catalyst showed the good selectivity and activity for reduction of nitro compound as well as for tandem reduction of nitro groups in Ugi reaction.
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Affiliation(s)
- Seyedeh Fazileh Hamzavi
- Department of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shahla Jamili
- Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran.
| | - Morteza Yousefzadi
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandarabbas, Iran
| | - Ali Mashinchian Moradi
- Department of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Narges Amrollahi Biuki
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandarabbas, Iran
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Abstract
A strategy is devised to synthesize zwitterionic acetylated cellulose nanofibrils (CNF). The strategy included acetylation, periodate oxidation, Schiff base reaction, borohydride reduction, and a quaternary ammonium reaction. Acetylation was performed in glacial acetic acid with a short reaction time of 90 min, yielding, on average, mono-acetylated CNF with hydroxyl groups available for further modification. The products from each step were characterized by FTIR spectroscopy, ζ-potential, SEM-EDS, AFM, and titration to track and verify the structural changes along the sequential modification route.
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Affiliation(s)
- Jowan Rostami
- Fiber and Polymer Technology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Aji P Mathew
- Department of Materials and Environmental Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
| | - Ulrica Edlund
- Fiber and Polymer Technology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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Baumberg J, Bell S, Bonifacio A, Chikkaraddy R, Chisanga M, Corsetti S, Delfino I, Eremina O, Fasolato C, Faulds K, Fleming H, Goodacre R, Graham D, Hardy M, Jamieson L, Keyes T, Królikowska A, Kuttner C, Langer J, Lightner C, Mahajan S, Masson JF, Muhamadali H, Natan M, Nicolson F, Nikelshparg E, Plakas K, Popp J, Porter M, Prezgot D, Pytlik N, Schlücker S, Silvestri A, Stone N, Tian ZQ, Tripathi A, Willner M, Wuytens P. SERS in biology/biomedical SERS: general discussion. Faraday Discuss 2019; 205:429-456. [PMID: 29160893 DOI: 10.1039/c7fd90089a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhao S, Zhang J, Chen Z, Tong Y, Shen J, Li D, Zhang M. Hydrogen generation and simultaneous removal of Cr(VI) by hydrolysis of NaBH 4 using Fe-Al-Si composite as accelerator. Chemosphere 2019; 223:131-139. [PMID: 30772592 DOI: 10.1016/j.chemosphere.2019.02.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 09/11/2018] [Revised: 02/03/2019] [Accepted: 02/10/2019] [Indexed: 06/09/2023]
Abstract
The present study reports a novel method for hydrogen generation and simultaneous removal of Cr(VI) from synthetic wastewater using NaBH4 as the reducing agent and Fe-Al-Si composite as accelerator. The results showed that the hydrogen generation yields of NaBH4 occurred at low pH, high temperature and stirring speed. The presence of Cr(VI) was found to inhibit hydrogen generation at the initial pH 3.0, especially at low temperature conditions. Increasing temperature resulted in the increase of hydrogen generation, whereas a higher reduction rate of Cr(VI) was obtained at low temperature. Therefore, to alleviate the contradiction between hydrogen generation and Cr(VI) removal with respect to temperature, we introduced reduction accelerator by preparing Fe-Al-Si composite using wasted fly ash as raw materials. The resultant hydrogen generation yield could be enhanced from 32.04 to 80.70%, and total Cr removal was increased from 46.72 to 98.96% at 30 °C. First, H+ produced by hydrolysis of Fe-Al-Si composite improves the hydrolysis ability of NaBH4, thus promoting its ability to reduce Cr(VI) and to produce hydrogen by itself. The Cr(VI) reduction and hydrogen generation process are competitive for H+, which is particularly evident at insufficient H+. Second, at low doses, Fe3+ exhibited a lower ability to promote hydrogen generation and simultaneous Cr(VI) removal than Al3+. One of the reasons for the low promotion ability of Fe3+ in the whole pH range was the formation of Fe0 at pH less than 3.0, and the other was the weaker hydrolysis ability of Fe3+ itself at pH greater than 3.0.
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Affiliation(s)
- Shengxin Zhao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Jinna Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Yanbin Tong
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China; School of Chemical Engineering, Daqing Normal University, Daqing, 163712, China.
| | - Jimin Shen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Dongmei Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Mingwen Zhang
- Heilongjiang Tobacco Industry Limited Company, Harbin, 150001, China
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12
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Sawicki A, Willows RD, Chen M. Spectral signatures of five hydroxymethyl chlorophyll a derivatives chemically derived from chlorophyll b or chlorophyll f. Photosynth Res 2019; 140:115-127. [PMID: 30604202 DOI: 10.1007/s11120-018-00611-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 10/17/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
Chlorophylls (Chls) are pigments involved in light capture and light reactions in photosynthesis. Chl a, Chl b, Chl d, and Chl f are characterized by unique absorbance maxima in the blue (Soret) and red (Qy) regions with Chl b, Chl d, and Chl f each possessing a single formyl group at a unique position. Relative to Chl a the Qy absorbance maximum of Chl b is blue-shifted while Chl d and Chl f are red-shifted with the shifts attributable to the relative positions of the formyl substitutions. Reduction of a formyl group of Chl b to form 7-hydroxymethyl Chl a, or oxidation of the vinyl group of Chl a into a formyl group to form Chl d was achieved using sodium borohydride (NaBH4) or β-mercaptoethanol (BME/O2), respectively. During the consecutive reactions of Chl b and Chl f using a three-step procedure (1. NaBH4, 2. BME/O2, and 3. NaBH4) two new 7-hydroxymethyl Chl a species were prepared possessing the 3-formyl or 3-hydroxymethyl groups and three new 2-hydroxymethyl Chl a species possessing the 3-vinyl, 3-formyl, or 3-hydroxymethyl groups, respectively. Identification of the spectral properties of 2-hydroxymethyl Chl a may be biologically significant for deducing the latter stages of Chl f biosynthesis if the mechanism parallels Chl b biosynthesis. The spectral features and chromatographic properties of these modified Chls are important for identifying potential intermediates in the biosynthesis of Chls such as Chl f and Chl d and for identification of any new Chls in nature.
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Affiliation(s)
- Artur Sawicki
- School of Life and Environmental Sciences, University of Sydney, Sydney, NSW, 2006, Australia
| | - Robert D Willows
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, 2019, Australia
| | - Min Chen
- School of Life and Environmental Sciences, University of Sydney, Sydney, NSW, 2006, Australia.
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13
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Ulucan-Altuntas K, Debik E. Borohydride method modification in synthesizing nano zero valent iron and its application in DDT removal. Environ Sci Pollut Res Int 2018; 25:30110-30121. [PMID: 30145763 DOI: 10.1007/s11356-018-2989-8] [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] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
Among the methods used in the literature for the synthesizing of nano zero valent iron (nZVI), borohydride is the most commonly used method; it is seen that different variables are used together. In this study, optimum nano zero valent iron (nZVI) synthesizing method using borohydride method has been modified by using multiple optimization method in terms of both particle size and zeta potential. Selected independent variables are selected as iron sulfate concentration, ethanol ratio, and flow rate of borohydride solution. With the optimum synthesis method determined, the lowest particle size was obtained as 70 nm only when the particle size was taken into consideration, whereas 88.2 nm nZVI could be produced when both the particle size and the zeta potential were taken into consideration. In addition, the removal of DDT, which is the most commonly used persistent organic pollutant pesticides in the world, was investigated by nZVI synthesized. Different initial DDT concentration was investigated by expressing oxidation reduction potential (ORP) difference, removal rates, and oxidation byproducts. When DDD and DDE concentrations are considered, it is found that DDT is more likely to oxidize in DDD in all studied initial DDT concentrations. Removal rate was higher than 80% with initial concentrations lower than 125 μg/L, which is a high concentration that could be found in surface waters.
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Affiliation(s)
- Kubra Ulucan-Altuntas
- Environmental Engineering Department, Yildiz Technical University, Istanbul, Turkey.
| | - Eyup Debik
- Environmental Engineering Department, Yildiz Technical University, Istanbul, Turkey
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14
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Wacławek S, Gončuková Z, Adach K, Fijałkowski M, Černík M. Green synthesis of gold nanoparticles using Artemisia dracunculus extract: control of the shape and size by varying synthesis conditions. Environ Sci Pollut Res Int 2018; 25:24210-24219. [PMID: 29948700 DOI: 10.1007/s11356-018-2510-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
In this study, selective green synthesis of gold nanoparticles (nAu) with the use of Tarragon extract (Artemisia dracunculus) was investigated. Characterization of the synthetized nAu was carried out using several techniques including: UV-Vis, SEM, zeta potential analysis, DLS, and ATR-FTIR. Based on measurements of Tarragon extract by HPLC-MS, significant chemical substances participating as reducing and stabilizing agents were identified. FTIR confirmed typical functional groups that could be found in these acids on the nAu surface, such as O-H, C=O and C-O. The effects of various parameters (concentration of Tarragon extract, Au precursor, and initial pH of the synthesis) on the shape and size of the nanoparticles have been investigated. UV-Vis and SEM confirmed the formation of nAu at various concentrations of the extract and Au precursor and showed correlation between the added extract concentration and shift in maximal absorbance towards higher frequencies, indicating the formation of smaller nanoplates. Zeta potential determined at various pH levels revealed that its value decreased with pH, but for all experiments in the pH range of 2.8 to 5.0, the value is below - 30 mV, an absolute value high enough for long-term nAu stability. In order to evaluate nAu catalytic activity, the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride was used as a model system. The reaction takes place 1.5 times faster on Au-triangles than on Au-spherical NPs.
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Affiliation(s)
- Stanisław Wacławek
- Centre for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic.
| | - Zuzanna Gončuková
- Centre for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic
| | - Kinga Adach
- Centre for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic
| | - Mateusz Fijałkowski
- Centre for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic
| | - Miroslav Černík
- Centre for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic.
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15
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Jin X, Li Q, Yang Q. The reactivity of Fe/Ni colloid stabilized by carboxymethylcellulose (CMC-Fe/Ni) toward chloroform. Environ Sci Pollut Res Int 2018; 25:21049-21057. [PMID: 29767309 DOI: 10.1007/s11356-018-2030-2] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 04/13/2018] [Indexed: 06/08/2023]
Abstract
The use of stabilizers can prevent the reactivity loss of nanoparticles due to aggregation. In this study, carboxymethylcellulose (CMC) was selected as the stabilizer to synthesize a highly stable CMC-stabilized Fe/Ni colloid (CMC-Fe/Ni) via pre-aggregation stabilization. The reactivity of CMC-Fe/Ni was evaluated via the reaction of chloroform (CF) degradation. The effect of background solution which composition was affected by the preparation of Fe/Ni (Fe/Ni precursors, NaBH4 dosage) and the addition of solute (common ions, sulfur compounds) on the reactivity of CMC-Fe/Ni was also investigated. Additionally, the dried CMC-Fe/Ni was used for characterization in terms of scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The experimental results indicated that CMC stabilization greatly improved the reactivity of Fe/Ni bimetal and CF (10 mg/L) could be completely degraded by CMC-Fe/Ni (0.1 g/L) within 45 min. The use of different Fe/Ni precursors resulting in the variations of background solution seemed to have no obvious influence on the reactivity of CMC-Fe/Ni, whereas the dosage of NaBH4 in background solution showed a negative correlation with the reactivity of CMC-Fe/Ni. Besides, the individual addition of external solutes into background solution all had an adverse effect on the reactivity of CMC-Fe/Ni, of which the poisoning effect of sulfides (Na2S, Na2S2O4) was significant than common ions and sulfite.
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Affiliation(s)
- Xin Jin
- Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
| | - Qun Li
- Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
| | - Qi Yang
- Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China.
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16
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Parsaee Z. Electrospun nanofibers decorated with bio-sonochemically synthesized gold nanoparticles as an ultrasensitive probe in amalgam-based mercury (II) detection system. Ultrason Sonochem 2018; 44:24-35. [PMID: 29680608 DOI: 10.1016/j.ultsonch.2018.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 10/27/2017] [Revised: 01/26/2018] [Accepted: 02/05/2018] [Indexed: 06/08/2023]
Abstract
In this study, bio-ultrasound-assisted synthesized gold nanoparticles using Gracilaria canaliculata algae have been immobilized on a polymeric support and used as a glassy probe chemosensor for detection and rapid removal of Hg2+ ions. The function of the suggested chemosensor has been explained based on gold-amalgam formation and its catalytic role on the reaction of sodium borohydride and rhodamine B (RhB) with fluorescent and colorimetric sensing function. The catalyzed reduction of RhB by the gold amalgam led to a distinguished color change from red and yellow florescence to colorless by converting the amount of Hg2+ deposited on Au-NPs. The detection limit of the colorimetric and fluorescence assays for Hg2+ was 2.21 nM and 1.10 nM respectively. By exposing the mentioned colorless solution to air for at least 2 h, unexpectedly it was observed that the color and fluorescence of RhB were restored. Have the benefit of the above phenomenon a recyclable and portable glass-based sensor has been provided by immobilizing the Au-NPs and RB on the glass slide using electrospinning. Moreover, the introduced combinatorial membrane has facilitated the detection and removal of Hg2+ ions in various Hg (II)-contaminated real water samples with efficiency of up to 99%.
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Affiliation(s)
- Zohreh Parsaee
- Young Researchers and Elite Club, Bushehr Branch, Islamic Azad University, Bushehr, Iran.
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17
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Cirrone GAP, Manti L, Margarone D, Petringa G, Giuffrida L, Minopoli A, Picciotto A, Russo G, Cammarata F, Pisciotta P, Perozziello FM, Romano F, Marchese V, Milluzzo G, Scuderi V, Cuttone G, Korn G. First experimental proof of Proton Boron Capture Therapy (PBCT) to enhance protontherapy effectiveness. Sci Rep 2018; 8:1141. [PMID: 29348437 PMCID: PMC5773549 DOI: 10.1038/s41598-018-19258-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 12/27/2017] [Indexed: 01/16/2023] Open
Abstract
Protontherapy is hadrontherapy's fastest-growing modality and a pillar in the battle against cancer. Hadrontherapy's superiority lies in its inverted depth-dose profile, hence tumour-confined irradiation. Protons, however, lack distinct radiobiological advantages over photons or electrons. Higher LET (Linear Energy Transfer) 12C-ions can overcome cancer radioresistance: DNA lesion complexity increases with LET, resulting in efficient cell killing, i.e. higher Relative Biological Effectiveness (RBE). However, economic and radiobiological issues hamper 12C-ion clinical amenability. Thus, enhancing proton RBE is desirable. To this end, we exploited the p + 11B → 3α reaction to generate high-LET alpha particles with a clinical proton beam. To maximize the reaction rate, we used sodium borocaptate (BSH) with natural boron content. Boron-Neutron Capture Therapy (BNCT) uses 10B-enriched BSH for neutron irradiation-triggered alpha particles. We recorded significantly increased cellular lethality and chromosome aberration complexity. A strategy combining protontherapy's ballistic precision with the higher RBE promised by BNCT and 12C-ion therapy is thus demonstrated.
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Affiliation(s)
- G A P Cirrone
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy.
| | - L Manti
- Physics Department, University of Naples Federico II, Naples, Italy
- INFN Naples Section, Complesso Universitario di Monte S. Angelo, Via Cintia, Naples, Italy
| | - D Margarone
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, Na Slovance 2, Prague, 18221, Czech Republic
| | - G Petringa
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Physics Department, University of Catania, via S. Sofia, 64, Catania, Italy
| | - L Giuffrida
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, Na Slovance 2, Prague, 18221, Czech Republic
| | - A Minopoli
- Physics Department, University of Naples Federico II, Naples, Italy
| | - A Picciotto
- Fondazione Bruno Kessler, Micro-Nano Facility, Via Sommarive 18, 38123, Povo-Trento, Italy
| | - G Russo
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Institute of Molecular Bioimaging and Physiology - National Research Council - (IBFM-CNR), Cefalù, (PA), Italy
| | - F Cammarata
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Institute of Molecular Bioimaging and Physiology - National Research Council - (IBFM-CNR), Cefalù, (PA), Italy
| | - P Pisciotta
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Physics Department, University of Catania, via S. Sofia, 64, Catania, Italy
| | - F M Perozziello
- Physics Department, University of Naples Federico II, Naples, Italy
- INFN Naples Section, Complesso Universitario di Monte S. Angelo, Via Cintia, Naples, Italy
| | - F Romano
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- National Physical Laboratory, Acoustic and Ionizing Radiation Division, Teddington, TW11 0LW, Middlesex, United Kingdom
| | - V Marchese
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
| | - G Milluzzo
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Physics Department, University of Catania, via S. Sofia, 64, Catania, Italy
| | - V Scuderi
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, Na Slovance 2, Prague, 18221, Czech Republic
| | - G Cuttone
- Istituto Nazionale di Fisica Nucleare- Laboratori Nazionali dei Sud, via S. Sofia, 62, Catania, Italy
| | - G Korn
- Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, Na Slovance 2, Prague, 18221, Czech Republic
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18
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Belay TA, Lin CY, Hsiao HM, Chang MF, Liu JC. Effect of precursor type on the reduction of concentrated nitrate using zero-valent copper and sodium borohydride. Water Sci Technol 2018; 77:114-122. [PMID: 29339610 DOI: 10.2166/wst.2017.525] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, we demonstrated that the choice of precursor has a strong effect on the reduction of nitrate (NO3-) using zero-valent copper (Cu0) synthesized by sodium borohydride (NaBH4). Different precursors: CuSO4, CuO, Cu2O, Cu powder, and Cu mesh were used to reduce NO3- at 677 mg-N/L under the reducing conditions of NaBH4. Compared with the prehydrolyzed samples, those prepared without prehydrolysis exhibited lower reduction rates, longer times and higher concentrations of nitrite (NO2-) intermediate. It was found that one-time addition of NaBH4 resulted in higher reduction rate and less NO2- intermediate than two-step addition. Results showed that Cu0 from CuSO4 possessed the smallest particle size (890.9 nm), highest surface area (26.0 m2/g), and highest reaction rate (0.166 min-1). Values of pseudo-first-order constant (kobs) were in the order: CuSO4 > CuO > Cu2O > Cu powder >Cu mesh. However, values of surface area-normalized reaction rate (kSA) were approximately equal. It was proposed that NO3- was reduced to NO2- on Cu0, and then converted to NH4+ and N2, respectively; H2 generated from both NaBH4 hydration and Cu (II) reduction contributed to NO3- reduction as well.
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Affiliation(s)
- Tihitinna Asmellash Belay
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106, Taiwan E-mail: ; Department of Chemistry, Bahir Dar University, Bahir Dar, Ethiopia
| | - C Y Lin
- Institute of Nuclear Energy Research, 1000 Wen-Hua Road, Chia-An Village, Lung-Tan District, Taoyuan City 32546, Taiwan
| | - H M Hsiao
- Institute of Nuclear Energy Research, 1000 Wen-Hua Road, Chia-An Village, Lung-Tan District, Taoyuan City 32546, Taiwan
| | - M F Chang
- Institute of Nuclear Energy Research, 1000 Wen-Hua Road, Chia-An Village, Lung-Tan District, Taoyuan City 32546, Taiwan
| | - J C Liu
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106, Taiwan E-mail:
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Dovgaliuk I, Safin DA, Tumanov NA, Morelle F, Moulai A, Černý R, Łodziana Z, Devillers M, Filinchuk Y. Solid Aluminum Borohydrides for Prospective Hydrogen Storage. ChemSusChem 2017; 10:4725-4734. [PMID: 28981990 DOI: 10.1002/cssc.201701629] [Citation(s) in RCA: 7] [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: 08/27/2017] [Revised: 10/04/2017] [Indexed: 06/07/2023]
Abstract
Metal borohydrides are intensively researched as high-capacity hydrogen storage materials. Aluminum is a cheap, light, and abundant element and Al3+ can serve as a template for reversible dehydrogenation. However, Al(BH4 )3 , containing 16.9 wt % of hydrogen, has a low boiling point, is explosive on air and has poor storage stability. A new family of mixed-cation borohydrides M[Al(BH4 )4 ], which are all solid under ambient conditions, show diverse thermal decomposition behaviors: Al(BH4 )3 is released for M=Li+ or Na+ , whereas heavier derivatives evolve hydrogen and diborane. NH4 [Al(BH4 )4 ], containing both protic and hydridic hydrogen, has the lowest decomposition temperature of 35 °C and yields Al(BH4 )3 ⋅NHBH and hydrogen. The decomposition temperatures, correlated with the cations' ionic potential, show that M[Al(BH4 )4 ] species are in the most practical stability window. This family of solids, with convenient and versatile properties, puts aluminum borohydride chemistry in the mainstream of hydrogen storage research, for example, for the development of reactive hydride composites with increased hydrogen content.
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Affiliation(s)
- Iurii Dovgaliuk
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
- Swiss-Norwegian Beamlines, European Synchrotron Radiation Facility, Martyrs, 38042, Grenoble Cedex 9, France
| | - Damir A Safin
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Nikolay A Tumanov
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Fabrice Morelle
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Adel Moulai
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Radovan Černý
- Laboratory of Crystallography, DQMP, University of Geneva, quai Ernest-Ansermet 24, 1211, Geneva, Switzerland
| | - Zbigniew Łodziana
- Department of Structural Research, INP Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342, Kraków, Poland
| | - Michel Devillers
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium
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20
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Lin YR, Huang MF, Wu YY, Liu MC, Huang JH, Chen Z, Shiue YL, Wu CE, Liang SS. Reductive amination derivatization for the quantification of garlic components by isotope dilution analysis. Food Chem 2017; 230:1-5. [PMID: 28407889 DOI: 10.1016/j.foodchem.2017.02.119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 07/15/2016] [Revised: 01/13/2017] [Accepted: 02/23/2017] [Indexed: 12/11/2022]
Abstract
In this work, we synthesized internal standards for four garlic organosulfur compounds (OSCs) by reductive amination with 13C, D2-formaldehyde, and developed an isotope dilution analysis method to quantitate these organosulfur components in garlic samples. Internal standards were synthesized for internal absolute quantification of S-allylcysteine (SAC), S-allylcysteine sulfoxide (alliin), S-methylcysteine (SMC), and S-ethylcysteine (SEC). We used a multiple reaction monitoring (MRM) to detect 13C, D2-formaldehyde-modified OSCs by ultrahigh-performance liquid phase chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) and obtained MS spectra showing different ratios of 13C, D2-formaldehyde-modified and H2-formaldehyde-modified compounds. The resulting labeled and unlabeled OSCs were exhibited correlation coefficient (R2) ranged from 0.9989 to 0.9994, respectively. The average recoveries for four OSCs at three concentration levels ranged from 89% to 105%. By 13C, D2-formaldehyde and sodium cyanoborohydride, the reductive amination-based method can be utilized to generate novel internal standard for isotope dilution and to extend the quantitative application.
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Affiliation(s)
- Yi-Reng Lin
- Department of Biotechnology, School of Environment and Life Sciences, Fooyin University, Kaohsiung, Taiwan
| | - Mei-Fang Huang
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - You-Ying Wu
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Meng-Chieh Liu
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Jing-Heng Huang
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ziyu Chen
- Department of Medicinal and Applied Chemistry, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yow-Ling Shiue
- Institute of Biomedical Science, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Chia-En Wu
- Department of Pharmacy and Master Program, College of Pharmacy and Health Care, Tajen University, Pingtung, Taiwan
| | - Shih-Shin Liang
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan; Institute of Biomedical Science, National Sun Yat-Sen University, Kaohsiung, Taiwan.
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21
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Shi G, Li Y, Xi G, Xu Q, He Z, Liu Y, Zhang J, Cai J. Rapid green synthesis of gold nanocatalyst for high-efficiency degradation of quinclorac. J Hazard Mater 2017; 335:170-177. [PMID: 28448880 DOI: 10.1016/j.jhazmat.2017.04.042] [Citation(s) in RCA: 7] [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: 11/09/2016] [Revised: 03/27/2017] [Accepted: 04/16/2017] [Indexed: 06/07/2023]
Abstract
Porous chemical pretreated Saccharomyces cerevisiae was used as support, stabilizer, and reducing agent for the rapid green synthesis of gold nanocatalyst. Au nanoparticles (Au NPs) were generated through in-situ reduction of the absorbed Au(III) by the reductive functional groups of mannoproteins in yeast cell wall. The obtained spherical mono-dispersed Au NPs have an average particle diameter of 9.99±1.63nm as evidenced by TEM image, and exhibits excellent catalytic activity for the dechlorination of quinclorac to 8-quinoline-carboxylic acid by sodium borohydride. The reductive dechlorination of quinclorac is chemical reaction controlled and follows pseudo-first-order kinetic model. The rate constant increases with the increase of the temperature and decrease of the initial quinclorac concentration. The present synthesis protocol of Au nanocatalyst has the advantages of rapid, convenient and mild operation, high catalytic dechlorination efficiency and organic solvent-free nature.
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Affiliation(s)
- Guorong Shi
- College of Science, Hunan Agricultural University, Changsha 410128, China; Tobacco Research Institute, Hunan Agricultural University, Changsha 410128, China.
| | - Yulu Li
- College of Science, Hunan Agricultural University, Changsha 410128, China
| | - Gaihong Xi
- Tobacco Research Institute, Hunan Agricultural University, Changsha 410128, China
| | - Qinqin Xu
- College of Science, Hunan Agricultural University, Changsha 410128, China
| | - Zijun He
- College of Science, Hunan Agricultural University, Changsha 410128, China
| | - Yating Liu
- Tobacco Research Institute, Hunan Agricultural University, Changsha 410128, China
| | - Jianhui Zhang
- Hunan Institute of Food Quality Supervision Inspection and Research, Changsha 410111, China
| | - Jun Cai
- College of Science, Hunan Agricultural University, Changsha 410128, China
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Khan S, Runguo W, Tahir K, Jichuan Z, Zhang L. Catalytic reduction of 4-nitrophenol and photo inhibition of Pseudomonas aeruginosa using gold nanoparticles as photocatalyst. J Photochem Photobiol B 2017; 170:181-187. [PMID: 28437746 DOI: 10.1016/j.jphotobiol.2017.04.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [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: 11/24/2015] [Revised: 04/07/2017] [Accepted: 04/07/2017] [Indexed: 11/19/2022]
Abstract
A simple, green method is described for the synthesis of Gold (Au) nanoparticles (NPs) using Cotoneaster horizontalis extract as a phyto-reducer and capping agent with superior photo inhibition activity against Pseudomonas aeruginosa. Different from the other methods used elevated temperatures for nanoparticles synthesis, the novelty of our method lies in its energy saving process and fast synthesis rates (~5min for AuNPs), and its potential to tune the nanoparticles size and afterward their catalytic activity. The starch, fatty acid and reducing sugars present in the extract are mostly responsible for repaid reduction rate Au+3 ions to AuNPs. Strong Plasmon resonance (SPR) of AuNPs was observed at 560nm, which indicates the formation of gold nanoparticles. Uv-visible spectroscopy, high resolution transmission electron microscope (HRTEM) and energy dispersion X-ray diffraction (XRD) were preformed to find out the formation of AuNPs. Proficient reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) in the presence of AuNPs and NaBH4 was observed and was found to depend upon the nanoparticle size or the extract concentration. The AuNPs was also evaluated for antibacterial against P. aeruginosa. Before transferred it into antibacterial activity, it placed under visible light for 120min. The same experiment was performed in dark as control medium. The photo irradiated AuNPs was observed to be more effective against P. aeruginosa. The result showed that diameter of zone of inhibition of visible light irradiated AuNPs against P. aeruginosa was 17 (±0.5) and in dark was 8 (±0.4) mm.
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Affiliation(s)
- Shafiullah Khan
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China; Institute of Chemical Sciences, Gomal University, D.I.Khan, Pakistan
| | - Wang Runguo
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China
| | - Kamran Tahir
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China; Institute of Chemical Sciences, Gomal University, D.I.Khan, Pakistan
| | - Zhang Jichuan
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China
| | - Liqun Zhang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China.
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Prokopijevic M, Prodanovic O, Spasojevic D, Kovacevic G, Polovic N, Radotic K, Prodanovic R. Tyramine-modified pectins via periodate oxidation for soybean hull peroxidase induced hydrogel formation and immobilization. Appl Microbiol Biotechnol 2017; 101:2281-2290. [PMID: 27942755 DOI: 10.1007/s00253-016-8002-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 09/16/2016] [Revised: 11/06/2016] [Accepted: 11/09/2016] [Indexed: 12/22/2022]
Abstract
Pectin was modified by oxidation with sodium periodate at molar ratios of 2.5, 5, 10, 15 and 20 mol% and reductive amination with tyramine and sodium cyanoborohydride afterwards. Concentration of tyramine groups within modified pectin ranged from 54.5 to 538 μmol/g of dry pectin while concentration of ionizable groups ranged from 3.0 to 4.0 mmol/g of dry polymer compared to 1.5 mmol/g before modification due to the introduction of amino group. All tyramine-pectins showed exceptional gelling properties and could form hydrogel both by cross-linking of carboxyl groups with calcium or by cross-linking phenol groups with peroxidase in the presence of hydrogen peroxide. These hydrogels were tested as carriers for soybean hull peroxidase (SHP) immobilization within microbeads formed in an emulsion based enzymatic polymerization reaction. SHP immobilized within tyramine-pectin microbeads had an increased thermal and organic solvent stability compared to the soluble enzyme. Immobilized SHP was more active in acidic pH region and had slightly decreased K m value of 2.61 mM compared to the soluble enzyme. After 7 cycles of repeated use in batch reactor for pyrogallol oxidation microbeads, immobilized SHP retained half of the initial activity.
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Affiliation(s)
- Milos Prokopijevic
- Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, 11030, Serbia
| | - Olivera Prodanovic
- Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, 11030, Serbia
| | - Dragica Spasojevic
- Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, 11030, Serbia
| | - Gordana Kovacevic
- Department of Biochemistry, Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11000, Serbia
| | - Natalija Polovic
- Department of Biochemistry, Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11000, Serbia
| | - Ksenija Radotic
- Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, 11030, Serbia
| | - Radivoje Prodanovic
- Department of Biochemistry, Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11000, Serbia.
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Bhargava A, Jain N, Khan MA, Pareek V, Dilip RV, Panwar J. Utilizing metal tolerance potential of soil fungus for efficient synthesis of gold nanoparticles with superior catalytic activity for degradation of rhodamine B. J Environ Manage 2016; 183:22-32. [PMID: 27567934 DOI: 10.1016/j.jenvman.2016.08.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [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: 01/10/2016] [Accepted: 08/09/2016] [Indexed: 05/02/2023]
Abstract
In recent years, the surging demand of nanomaterials has boosted unprecedented expansion of research for the development of high yielding and sustainable synthesis methods which can deliver nanomaterials with desired characteristics. Unlike the well-established physico-chemical methods which have various limitations, biological methods inspired by mimicking natural biomineralization processes have great potential for nanoparticle synthesis. An eco-friendly and sustainable biological method that deliver particles with well-defined shape, size and compositions can be developed by selecting a proficient organism followed by fine tuning of various process parameter. The present study revealed high metal tolerance ability of a soil fungus Cladosporium oxysporum AJP03 and its potential for extracellular synthesis of gold nanoparticles. The morphology, composition and crystallinity of nanoparticles were confirmed using standard techniques. The synthesized particles were quasi-spherical in shape with fcc packing and an average particle size of 72.32 ± 21.80 nm. A series of experiments were conducted to study the effect of different process parameters on particle size and yield. Biomass: water ratio of 1:5 and 1 mM precursor salt concentration at physiological pH (7.0) favoured the synthesis of well-defined gold nanoparticles with maximum yield. The as-synthesized nanoparticles showed excellent catalytic efficiency towards sodium borohydride mediated reduction of rhodamine B (2.5 × 10(-5) M) within 7 min of reaction time under experimental conditions. Presence of proteins as capping material on the nanoparticle surface was found to be responsible for this remarkable catalytic efficiency. The present approach can be extrapolated to develop controlled and up-scalable process for mycosynthesis of nanoparticles for diverse applications.
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Affiliation(s)
- Arpit Bhargava
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India
| | - Navin Jain
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India
| | - Mohd Azeem Khan
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India
| | - Vikram Pareek
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India
| | - R Venkataramana Dilip
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India
| | - Jitendra Panwar
- Centre for Biotechnology, Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, 333031, India.
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25
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Gonzalez C, Kavoosi S, Sanchez A, Wnuk SF. Reduction of sugar lactones to hemiacetals with lithium triethylborohydride. Carbohydr Res 2016; 432:17-22. [PMID: 27341397 DOI: 10.1016/j.carres.2016.06.002] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 06/07/2016] [Accepted: 06/09/2016] [Indexed: 11/17/2022]
Abstract
Reduction of ribono-1,4-lactones and gulono-1,4-lactone as well as ribono-1,5-lactone and glucono-1,5-lactones with LTBH (1.2 equiv.) in CH2Cl2 at 0 °C for 30 min provided the corresponding pentose or hexose hemiacetals in high yields. Commonly used in carbohydrate chemistry protecting groups such as trityl, benzyl, silyl, acetals and to some extent acyls are compatible with this reduction.
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Affiliation(s)
- Cesar Gonzalez
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Sam Kavoosi
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Andersson Sanchez
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Stanislaw F Wnuk
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA.
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26
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Abstract
The synthesis of Au@AgAu yolk-shell cuboctahedra nanoparticles formed by galvanic replacement in a seed-mediated method is described. Initially, single-crystal Au seeds are used for the formation of Au@Ag core-shell nanocubes, which serve as the template material for the deposition of an external Au layer. The well-controlled synthesis yields the formation of cuboctahedra nanoparticles with smooth inner and outer Au/Ag surfaces. The deposition/oxidation process is described to understand the formation of cuboctahedra and octahedra nanoparticles. The Au core maintains the initial morphology of the seed and remains static at the center of the yolk-shell because of residual Ag. Structural analysis of the shell indicates intrinsic stacking faults (SFs) near the surface. Energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) compositional analysis show an Au-Ag nonordered alloy forming the shell. The three-dimensional structure of the nanoparticles presented open facets on the [111] as observed by electron tomography SIRT reconstruction over a stack of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images. The geometrical model was validated by analyzing the direction of streaks in coherent nanobeam diffraction (NBD). The catalytic activity was evaluated using a model reaction based on the reduction of 4-nitrophenol (4-NTP) by NaBH4 in the presence of Au@AgAu yolk-shell nanoparticles.
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Affiliation(s)
- Alejandra Londono-Calderon
- Department of Physics and Astronomy, University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Daniel Bahena
- Advanced Laboratory of Electron Nanoscopy, Cinvestav, Av. Instituto Politecnico Nacional , 2508, Col. San Pedro Zacatenco, Delegacion Gustavo A. Madero, Mexico D.F. CP 07360, Mexico
| | - Miguel J Yacaman
- Department of Physics and Astronomy, University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
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Abstract
This report is an analysis of the structure of the compound biological effectiveness (CBE) factor. The value of the CBE factor previously reported was revalued for the central nervous system, skin and lung. To describe the structure, the following terms are introduced: the vascular CBE (v-CBE), intraluminal CBE (il-CBE), extraluminal CBE (el-CBE) and non-vascular CBE (nv-CBE) factors and the geometric biological factor (GBF), i.e. the contributions that are derived from the total dose to the vasculature, each dose to vasculature from the intraluminal side and the extraluminal side, the dose to the non-vascular tissue and the factor to calculate el-CBE from il-CBE, respectively. The el-CBE factor element was also introduced to relate il-CBE to el-CBE factors. A CBE factor of 0.36 for disodium mercaptoundecahydrododecaborate (BSH) for the CNS was independent of the (10)B level in the blood; however, that for p-Boron-L-phenylalanine (BPA) increased with the (10)B level ratio of the normal tissue to the blood (N/B). The CBE factor was expressed as follows: factor = 0.32 + N/B × 1.65. The factor of 0.32 at 0 of N/B was close to the CBE factor for BSH. GBFs had similar values, between BSH and BPA, 1.39 and 1.52, respectively. The structure of the CBE factor for BPA to the lung was also elucidated based on this idea. The factor is described as follows: CBE factor = 0.32 + N/B × 1.80. By this elucidation of the structure of the CBE factor, it is expected that basic and clinical research into boron neutron capture therapy will progress.
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Affiliation(s)
- Koji Ono
- Research Division of Advanced Neutron Therapy, Particle Radiation Oncology Research Center, Kyoto University Research Reactor Institute, 2-1010, Asashironishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
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Petit E, Miele P, Demirci UB. By-Product Carrying Humidified Hydrogen: An Underestimated Issue in the Hydrolysis of Sodium Borohydride. ChemSusChem 2016; 9:1777-1780. [PMID: 27333077 DOI: 10.1002/cssc.201600425] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 04/01/2016] [Revised: 05/17/2016] [Indexed: 06/06/2023]
Abstract
Catalyzed hydrolysis of sodium borohydride generates up to four molecules of hydrogen, but contrary to what has been reported so far, the humidified evolved gas is not pure hydrogen. Elemental and spectroscopic analyses show, for the first time, that borate by-products pollute the stream as well as the vessel.
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Affiliation(s)
- Eddy Petit
- IEM (Institut Europeen des Membranes), UMR5635 (CNRS, ENSCM, UM), Universite de Montpellier, Place Eugene Bataillon, CC047, F-34095, Montpellier, France
| | - Philippe Miele
- IEM (Institut Europeen des Membranes), UMR5635 (CNRS, ENSCM, UM), Universite de Montpellier, Place Eugene Bataillon, CC047, F-34095, Montpellier, France
| | - Umit B Demirci
- IEM (Institut Europeen des Membranes), UMR5635 (CNRS, ENSCM, UM), Universite de Montpellier, Place Eugene Bataillon, CC047, F-34095, Montpellier, France.
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29
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Silva FPL, Dantas BB, Faheina Martins GV, de Araújo DAM, Vasconcellos MLADA. Synthesis and Anticancer Activities of Novel Guanylhydrazone and Aminoguanidine Tetrahydropyran Derivatives. Molecules 2016; 21:molecules21060671. [PMID: 27338323 PMCID: PMC6274535 DOI: 10.3390/molecules21060671] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 05/05/2016] [Accepted: 05/11/2016] [Indexed: 11/16/2022] Open
Abstract
In this paper we present the convenient syntheses of six new guanylhydrazone and aminoguanidine tetrahydropyran derivatives 2-7. The guanylhydrazone 2, 3 and 4 were prepared in 100% yield, starting from corresponding aromatic ketones 8a-c and aminoguanidine hydrochloride accessed by microwave irradiation. The aminoguanidine 5, 6 and 7 were prepared by reduction of guanylhydrazone 2-4 with sodium cyanoborohydride (94% yield of 5, and 100% yield of 6 and 7). The aromatic ketones 8a-c were prepared from the Barbier reaction followed by the Prins cyclization reaction (two steps, 63%-65% and 95%-98%). Cytotoxicity studies have demonstrated the effects of compounds 2-7 in various cancer and normal cell lines. That way, we showed that these compounds decreased cell viabilities in a micromolar range, and from all the compounds tested we can state that, at least, compound 3 can be considered a promising molecule for target-directed drug design.
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Affiliation(s)
- Fábio Pedrosa Lins Silva
- Departamento de Química, Campus I, Laboratório de Síntese Orgânica Medicinal da Paraíba (LASOM-PB), Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Bruna Braga Dantas
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Gláucia Veríssimo Faheina Martins
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Demétrius Antônio Machado de Araújo
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Mário Luiz Araújo de Almeida Vasconcellos
- Departamento de Química, Campus I, Laboratório de Síntese Orgânica Medicinal da Paraíba (LASOM-PB), Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
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30
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Zhu N, Cao Y, Shi C, Wu P, Ma H. Biorecovery of gold as nanoparticles and its catalytic activities for p-nitrophenol degradation. Environ Sci Pollut Res Int 2016; 23:7627-7638. [PMID: 26739993 DOI: 10.1007/s11356-015-6033-y] [Citation(s) in RCA: 8] [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: 10/28/2015] [Accepted: 12/28/2015] [Indexed: 06/05/2023]
Abstract
Recovery of gold from aqueous solution using simple and economical methodologies is highly desirable. In this work, recovery of gold as gold nanoparticles (AuNPs) by Shewanella haliotis with sodium lactate as electron donor was explored. The results showed that the process was affected by the concentration of biomass, sodium lactate, and initial gold ions as well as pH value. Specifically, the presence of sodium lactate determines the formation of nanoparticles, biomass, and AuCl4 (-) concentration mainly affected the size and dispersity of the products, reaction pH greatly affected the recovery efficiency, and morphology of the products in the recovery process. Under appropriate conditions (5.25 g/L biomass, 40 mM sodium lactate, 0.5 mM AuCl4 (-), and pH of 5), the recovery efficiency was almost 99 %, and the recovered AuNPs were mainly spherical with size range of 10-30 nm (~85 %). Meanwhile, Fourier transforms infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated that carboxyl and amine groups might play an important role in the process. In addition, the catalytic activity of the AuNPs recovered under various conditions was testified by analyzing the reduction rate of p-nitrophenol by borohydride. The biorecovered AuNPs exhibited interesting size and shape-dependent catalytic activity, of which the spherical particle with smaller size showed the highest catalytic reduction activity with rate constant of 0.665 min(-1).
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Affiliation(s)
- Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, People's Republic of China.
- Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou, 510006, People's Republic of China.
| | - Yanlan Cao
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Chaohong Shi
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
- The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, People's Republic of China
- Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou, 510006, People's Republic of China
| | - Haiqin Ma
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
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31
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Itoh T, Saito T, Yamamoto Y, Ishida H, Yamamoto K. Gram scale synthesis of specialized pro-resolving mediator 17(S)-HDHA using lipoxygenase enhanced by water-soluble reducing agent TCEP. Bioorg Med Chem Lett 2016; 26:343-345. [PMID: 26707393 DOI: 10.1016/j.bmcl.2015.12.011] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Revised: 11/22/2015] [Accepted: 12/04/2015] [Indexed: 12/31/2022]
Abstract
17(S)-Hydroxy docosahexaenoic acid (17(S)-HDHA) is a specialized pro-resolving mediator. The oxidation of docosahexaenoic acid (DHA) to 17(S)-HDHA using soybean lipoxygenase was accomplished in the presence of the reducing agent TCEP in high yield and high enantio excess. We demonstrated application of this strategy to the synthesis of other fatty acids and to gram scale synthesis of 17(S)-HDHA.
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Affiliation(s)
- Toshimasa Itoh
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Tomoko Saito
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Yoshinori Yamamoto
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Hiroaki Ishida
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Keiko Yamamoto
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan.
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32
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Mazzier D, Carraro F, Crisma M, Rancan M, Toniolo C, Moretto A. A terminally protected dipeptide: from crystal structure and self-assembly, through co-assembly with carbon-based materials, to a ternary catalyst for reduction chemistry in water. Soft Matter 2016; 12:238-245. [PMID: 26463728 DOI: 10.1039/c5sm02189h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A terminally protected, hydrophobic dipeptide Boc-L-Cys(Me)-L-Leu-OMe (1) was synthesized and its 3D-structure was determined by single crystal X-ray diffraction analysis. This peptide is able to hierarchically self-assemble in a variety of superstructures, including hollow rods, ranging from the nano- to the macroscale, and organogels. In addition, 1 is able to drive fullerene (C60) or multiwalled carbon nanotubes (MWCNTs) in an organogel by co-assembling with them. A hybrid 1-C60–MWCNT organogel was prepared and converted (through a high vacuum-drying process) into a robust, high-volume, water insoluble, solid material where C60 is well dispersed over the entire superstructure. This ternary material was successfully tested as a catalyst for: (i) the reduction reaction of water-soluble azo compounds mediated by NaBH4 and UV-light with an overall performance remarkably better than that provided by C60 alone, and (ii) the NaBH4-mediated reduction of benzoic acid to benzyl alcohol. Our results suggest that the self-assembly properties of 1 might be related to the occurrence in its single crystal structure of a sixfold screw axis, a feature shared by most of the linear peptides known so far to give rise to nanotubes.
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Affiliation(s)
- Daniela Mazzier
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy.
| | - Francesco Carraro
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy.
| | - Marco Crisma
- Institute of Biomolecular Chemistry, Padova Unit, CNR, 35131 Padova, Italy
| | - Marzio Rancan
- Institute for Energetics and Interphases, CNR, 35131 Padova, Italy
| | - Claudio Toniolo
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy. and Institute of Biomolecular Chemistry, Padova Unit, CNR, 35131 Padova, Italy
| | - Alessandro Moretto
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy. and Institute of Biomolecular Chemistry, Padova Unit, CNR, 35131 Padova, Italy
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33
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Lin R, Cheng J, Ding L, Song W, Zhou J, Cen K. Sodium borohydride removes aldehyde inhibitors for enhancing biohydrogen fermentation. Bioresour Technol 2015; 197:323-328. [PMID: 26342346 DOI: 10.1016/j.biortech.2015.08.105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 07/20/2015] [Revised: 08/25/2015] [Accepted: 08/26/2015] [Indexed: 06/05/2023]
Abstract
To enhance biohydrogen production from glucose and xylose in the presence of aldehyde inhibitors, reducing agent (i.e., sodium borohydride) was in situ added for effective detoxification. The detoxification efficiencies of furfural (96.7%) and 5-hydroxymethylfurfural (5-HMF, 91.7%) with 30mM NaBH4 were much higher than those of vanillin (77.3%) and syringaldehyde (69.3%). Biohydrogen fermentation was completely inhibited without detoxification, probably because of the consumption of nicotinamide adenine dinucleotide (NADH) by inhibitors reduction (R-CHO+2NADH→R-CH2OH+2NAD(+)). Addition of 30mM NaBH4 provided the reducing power necessary for inhibitors reduction (4R-CHO+NaBH4+2H2O→4R-CH2OH+NaBO2). The recovered reducing power in fermentation resulted in 99.3% recovery of the hydrogen yield and 64.6% recovery of peak production rate. Metabolite production and carbon conversion after detoxification significantly increased to 63.7mM and 81.9%, respectively.
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Affiliation(s)
- Richen Lin
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Lingkan Ding
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Wenlu Song
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; Department of Life Science and Engineering, Jining University, Jining 273155, China
| | - Junhu Zhou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Jepsen LH, Lee YS, Černý R, Sarusie RS, Cho YW, Besenbacher F, Jensen TR. Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties. ChemSusChem 2015; 8:3472-3482. [PMID: 26364708 DOI: 10.1002/cssc.201500713] [Citation(s) in RCA: 8] [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: 05/27/2015] [Revised: 07/14/2015] [Indexed: 06/05/2023]
Abstract
A new series of solvent- and halide-free ammine strontium metal borohydrides Sr(NH3 )n (BH4 )2 (n=1, 2, and 4) and further investigations of Ca(NH3 )n (BH4 )2 (n=1, 2, 4, and 6) are presented. Crystal structures have been determined by powder XRD and optimized by DFT calculations to evaluate the strength of the dihydrogen bonds. Sr(NH3 )(BH4 )2 (Pbcn) and Sr(NH3 )2 (BH4 )2 (Pnc2) are layered structures, whereas M(NH3 )4 (BH4 )2 (M=Ca and Sr; P21 /c) are molecular structures connected by dihydrogen bonds. Both series of compounds release NH3 gas upon thermal treatment if the partial pressure of ammonia is low. Therefore, the strength of the dihydrogen bonds, the structure of the compounds, and the NH3 /BH4 (-) ratio for M(NH3 )n (BH4 )m have little influence on the composition of the released gasses. The composition of the released gas depends mainly on the thermal stability of the ammine metal borohydride and the corresponding metal borohydride.
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Affiliation(s)
- Lars H Jepsen
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Young-Su Lee
- High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea
| | - Radovan Černý
- Laboratory of Crystallography, DQMP, University of Geneva, 1211, Geneva, Switzerland
| | - Ram S Sarusie
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Young Whan Cho
- High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea
| | - Flemming Besenbacher
- Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000, Aarhus C, Denmark
| | - Torben R Jensen
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark.
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35
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Fu Y, Huang T, Zhang L, Zhu J, Wang X. Ag/g-C3N4 catalyst with superior catalytic performance for the degradation of dyes: a borohydride-generated superoxide radical approach. Nanoscale 2015. [PMID: 26220662 DOI: 10.1039/c5nr03260a] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A straightforward approach is developed for fabrication of a visible-light-driven Ag/g-C3N4 catalyst. Morphological observation shows that the g-C3N4 sheets are decorated with highly dispersed Ag nanoparticles having an average size of 5.6 nm. The photocatalytic activity measurements demonstrate that the photocatalytic degradation rates of methyl orange (MO), methylene blue (MB), and neutral dark yellow GL (NDY-GL) over Ag/g-C3N4-4 can reach up to 98.2, 99.3 and 99.6% in the presence of borohydride ions (BH4(-)) only with 8, 45, and 16 min visible light irradiation, respectively. The significant enhancement in photoactivity of the catalyst is mainly attributed to the high dispersity and smaller size of Ag nanoparticles, the strong surface plasmon resonance (SPR) effect of metallic Ag nanoparticles, the efficient separation of photogenerated charge carriers, the additional superoxide radicals (O) generated from the reduction of dissolved oxygen in the presence of BH4(-) and the synergistic effect of Ag nanoparticles and g-C3N4.
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Affiliation(s)
- Yongsheng Fu
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, Nanjing University of Science and Technology, 210094, Nanjing, China.
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Mok YK, Arantes V, Saddler JN. A NaBH₄ Coupled Ninhydrin-Based Assay for the Quantification of Protein/Enzymes During the Enzymatic Hydrolysis of Pretreated Lignocellulosic Biomass. Appl Biochem Biotechnol 2015; 176:1564-80. [PMID: 25987134 DOI: 10.1007/s12010-015-1662-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 05/07/2015] [Indexed: 11/26/2022]
Abstract
Accurate protein quantification is necessary in many of the steps during the enzymatic hydrolysis of pretreated lignocellulosic biomass, from the fundamental determination of enzyme kinetics to techno-economic assessments, such as the use of enzyme recycling strategies, evaluation of enzyme costs, and the optimization of various process steps. In the work described here, a modified, more rapid ninhydrin-based protein quantification assay was developed to better quantify enzyme levels in the presence of lignocellulosic biomass derived compounds. The addition of sodium borohydride followed by acid hydrolysis at 130 °C greatly reduced interference from monosaccharides and oligosaccharides and decreased the assay time 6-fold. The modified ninhydrin assay was shown to be more accurate as compared to various traditional colorimetric protein assays when commercial cellulase enzyme mixtures were quantified under typical pretreated lignocellulosic biomass enzymatic hydrolysis conditions. The relatively short assay time and microplate-reading capability of the modified assay indicated that the method could likely be used for high-throughput protein determination.
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Affiliation(s)
- Yiu Ki Mok
- Forest Products Biotechnology/Bioenergy Group, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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Chen Y, Dong S, Li S, Liu Y, Yan W. Preparation and Growth of N-Doped Hollow Carbon Nanospheres and Their Application as Catalyst Support in Direct Borohydride Fuel Cell. J Nanosci Nanotechnol 2015; 15:3862-3869. [PMID: 26505016 DOI: 10.1166/jnn.2015.9541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
N-doped hollow carbon nanospheres (HCNSs) were prepared by electric arc discharge method in N2 atmosphere. X-ray Photoelectron Spectroscopy (XPS) analysis shows that their nitrogen content reaches up to 4.9 atom%. Both the low thermal conductivity of N2 and the doping of nitrogen atom make carbon unit bend to form hollow nanosphere structure. High-resolution transmission electron microscopy (HRTEM) and X-ray diffusion (XRD) analysis prove the presence of detected defects and a poor crystallinity on the HCNSs shell. Moreover, annealing treatment of HCNSs was carried out at 1100 degrees C/10 h and 1400 degrees C/2 h to research their fracture extension. It is found that HCNSs could grow into closed-tubes even with a shell at high annealing temperature. HCNSs were applied in direct borohydride fuel cell (DBFC) to evaluate their catalytic performance. The electrochemical results show that pure HCNSs doesn't have any catalysis effect, but they can greatly promote the catalytic performance of CoO, and the largest polarization current density of which achieves 1.845 A x cm(-2) at -0.7 V (vs. Hg/HgO electrode).
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38
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Jepsen LH, Ley MB, Filinchuk Y, Besenbacher F, Jensen TR. Tailoring the properties of ammine metal borohydrides for solid-state hydrogen storage. ChemSusChem 2015; 8:1452-1463. [PMID: 25821161 DOI: 10.1002/cssc.201500029] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Indexed: 06/04/2023]
Abstract
A series of halide-free ammine manganese borohydrides, Mn(BH4 )2 ⋅nNH3 , n=1, 2, 3, and 6, a new bimetallic compound Li2 Mn(BH4 )4 ⋅6NH3 , and the first ammine metal borohydride solid solution Mg1-x Mnx (BH4 )2 ⋅6NH3 are presented. Four new crystal structures have been determined by synchrotron radiation powder X-ray diffraction and the thermal decomposition is systematically investigated for all the new compounds. The solid-gas reaction between Mn(BH4 )2 and NH3 provides Mn(BH4 )2 ⋅6NH3 . The number of NH3 per Mn has been varied by mechanochemical treatment of Mn(BH4 )2 ⋅6NH3 -Mn(BH4 )2 mixtures giving rise to increased hydrogen purity for n/m≤1 for M(BH4 )m ⋅nNH3 . The structures of Mg(BH4 )2 ⋅3NH3 and Li2 Mg(BH4 )4 ⋅6NH3 have been revisited and new structural models are presented. Finally, we demonstrate that ammonia destabilizes metal borohydrides with low electronegativity of the metal (χp <∼1.6), while metal borohydrides with high electronegativity (χp >∼1.6) are generally stabilized.
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Affiliation(s)
- Lars H Jepsen
- Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO); Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C (Denmark)
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Vinothkannan M, Karthikeyan C, Gnana kumar G, Kim AR, Yoo DJ. One-pot green synthesis of reduced graphene oxide (RGO)/Fe3O4 nanocomposites and its catalytic activity toward methylene blue dye degradation. Spectrochim Acta A Mol Biomol Spectrosc 2015; 136 Pt B:256-264. [PMID: 25311523 DOI: 10.1016/j.saa.2014.09.031] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [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: 05/26/2014] [Revised: 08/21/2014] [Accepted: 09/11/2014] [Indexed: 06/04/2023]
Abstract
The reduced graphene oxide (RGO)/Fe3O4 nanocomposites were synthesized through a facile one-pot green synthesis by using solanum trilobatum extract as a reducing agent. Spherical shaped Fe3O4 nanoparticles with the diameter of 18 nm were uniformly anchored over the RGO matrix and the existence of fcc structured Fe3O4 nanoparticles over the RGO matrix was ensured from X-ray diffraction patterns. The amide functional groups exist in the solanum trilobatum extract is directly responsible for the reduction of Fe(3+) ions and GO. The thermal stability of GO was increased by the removal of hydrophilic functional groups via solanum trilobatum extract and was further promoted by the ceramic Fe3O4 nanoparticles. The ID/IG ratio of RGO/Fe3O4 was increased over GO, indicating the extended number of structural defects and disorders in the RGO/Fe3O4 composite. The catalytic efficiency of prepared nanostructures toward methylene blue (MB) dye degradation mediated through the electron transfer process of BH4(-) ions was studied in detail. The π-π stacking, hydrogen bonding and electrostatic interaction exerted between the RGO/Fe3O4 composite and methylene blue, increased the adsorption efficiency of dye molecules and the large surface area and extended number of active sites completely degraded the MB dye within 12 min.
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Affiliation(s)
- M Vinothkannan
- Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625-021, Tamilnadu, India
| | - C Karthikeyan
- Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625-021, Tamilnadu, India
| | - G Gnana kumar
- Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625-021, Tamilnadu, India.
| | - Ae Rhan Kim
- Department of Chemistry, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Dong Jin Yoo
- Department of Energy Storage/Conversion Engineering, R&D Education Center for Specialized Graduate School of Hydrogen and Fuel Cells Engineering, and Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeonju 561-756, Republic of Korea.
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40
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Liu A, Liu J, Zhang WX. Transformation and composition evolution of nanoscale zero valent iron (nZVI) synthesized by borohydride reduction in static water. Chemosphere 2015; 119:1068-1074. [PMID: 25317915 DOI: 10.1016/j.chemosphere.2014.09.026] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [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: 06/15/2014] [Revised: 08/28/2014] [Accepted: 09/05/2014] [Indexed: 06/04/2023]
Abstract
The reactivity of nanoscale zero valent iron (nZVI) toward targeted contaminants is affected by the initial nZVI composition and the iron oxides formed during the aging process in aquatic systems. In this paper, the aging effects of nZVI, prepared using a borohydride reduction method in static water over a period of 90 days (d), are investigated. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy are used to characterize the corrosion products of nZVI. Results show that both the structures and the compositions of the corrosion products change with the process of aging. The products of nZVI aged for 5 d in static water media are mainly magnetite (Fe3O4) and maghemite (γ-Fe2O3), accompanied by lepidocrocite (γ-FeOOH). For products aged 10 d, XRD data show the formation of ferrihydrite and lepidocrocite. When aged up to 90 d, the products are mainly γ-FeOOH mixed with small amounts of Fe3O4 and γ-Fe2O3. Transmission electronic microscopy (TEM) images show that the core-shell structure forms into a hollow spherical shape after 30 d of aging in aquatic media. The results indicate first that iron ions in the Fe(0) core diffuse outwardly toward the shell, and hollowed-out iron oxide shells emerge. Then, the iron oxide shell collapses and becomes a flaky, acicular-shaped structure. The type and the crystal phase of second iron oxide minerals are vastly different at various aging times. This study helps to explain the patterns of occurrence of specific iron oxides in different natural conditions.
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Affiliation(s)
- Airong Liu
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
| | - Jing Liu
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Wei-Xian Zhang
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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41
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Neufeldt S, Jiménez-Osés G, Comins DL, Houk KN. A twist on facial selectivity of hydride reductions of cyclic ketones: twist-boat conformers in cyclohexanone, piperidone, and tropinone reactions. J Org Chem 2014; 79:11609-18. [PMID: 25372509 PMCID: PMC4260662 DOI: 10.1021/jo5022635] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Indexed: 11/28/2022]
Abstract
The role of twist-boat conformers of cyclohexanones in hydride reductions was explored. The hydride reductions of a cis-2,6-disubstituted N-acylpiperidone, an N-acyltropinone, and tert-butylcyclohexanone by lithium aluminum hydride and by a bulky borohydride reagent were investigated computationally and compared to experiment. Our results indicate that in certain cases, factors such as substrate conformation, nucleophile bulkiness, and remote steric features can affect stereoselectivity in ways that are difficult to predict by the general Felkin-Anh model. In particular, we have calculated that a twist-boat conformation is relevant to the reactivity and facial selectivity of hydride reduction of cis-2,6-disubstituted N-acylpiperidones with a small hydride reagent (LiAlH4) but not with a bulky hydride (lithium triisopropylborohydride).
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Affiliation(s)
- Sharon
R. Neufeldt
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - Gonzalo Jiménez-Osés
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - Daniel L. Comins
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
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42
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He D, Kacopieros M, Ikeda-Ohno A, Waite TD. Optimizing the design and synthesis of supported silver nanoparticles for low cost water disinfection. Environ Sci Technol 2014; 48:12320-12326. [PMID: 25272282 DOI: 10.1021/es502804a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Silver nanoparticles (AgNPs) were successfully synthesized and impregnated on silica using chemical reduction methods. XPS and Ag K-edge XANES analysis revealed that the impregnation of AgNPs onto silica using a chitosan + sodium borohydride (NaBH4) method results in higher silver loading and Ag(0)/Ag(I) ratio compared to that obtained using NH3 + NaBH4/glucose methods. The effects of the dosage of chitosan on silver loading, Ag(I) release, and bactericidal activities of AgNP-impregnated silica were investigated, with results showing that, at high dosages of chitosan, Ag(I) released from AgNP-impregnated silica plays an important role in disinfection, while AgNP-mediated bactericidal action dominates at low dosages of chitosan. To further decrease the manufacturing cost, partially oxidized "black rice husk ash" containing substantial residual carbon was applied as AgNP support and found to lead to a greater degree of silver impregnation and to exhibit a longer disinfection lifetime than that of lower carbon content silica supports. On the basis of these findings, it is clear that considerable scope exists for careful optimization in the design and production of AgNP-based bactericidal materials for water treatment purposes.
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Affiliation(s)
- Di He
- School of Civil and Environmental Engineering, University of New South Wales , Sydney, New South Wales 2052, Australia
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43
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Ayaz Ahmed KB, Subramanian S, Sivasubramanian A, Veerappan G, Veerappan A. Preparation of gold nanoparticles using Salicornia brachiata plant extract and evaluation of catalytic and antibacterial activity. Spectrochim Acta A Mol Biomol Spectrosc 2014; 130:54-58. [PMID: 24762573 DOI: 10.1016/j.saa.2014.03.070] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [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: 12/21/2013] [Revised: 03/03/2014] [Accepted: 03/21/2014] [Indexed: 06/03/2023]
Abstract
The current study deals with the synthesis of gold nanoparticles (AuNPs) using Salicornia brachiata (Sb) and evaluation of their antibacterial and catalytic activity. The SbAuNPs showed purple color with a characteristic surface plasmon resonance peak at 532 nm. Scanning electron microscopy and transmission electron microscopy revealed polydispersed AuNPs with the size range from 22 to 35 nm. Energy dispersive X-ray and thin layer X-ray diffraction analysis clearly shows that SbAuNPs was pure and crystalline in nature. As prepared gold nanoparticles was used as a catalyst for the sodium borohydride reduction of 4-nitro phenol to 4-amino phenol and methylene blue to leucomethylene blue. The green synthesized nanoparticles exhibited potent antibacterial activity against the pathogenic bacteria, as evidenced by their zone of inhibition. In addition, we showed that the SbAuNPs in combination with the regular antibiotic, ofloxacin, exhibit superior antibacterial activity than the individual.
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Affiliation(s)
- Khan Behlol Ayaz Ahmed
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - Swetha Subramanian
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - Aravind Sivasubramanian
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - Ganapathy Veerappan
- SKKU Advanced Institute of Nano Technology, Sungkyunkwan University, Suwon, South Korea
| | - Anbazhagan Veerappan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India.
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44
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Kristiana I, Lethorn A, Joll C, Heitz A. To add or not to add: the use of quenching agents for the analysis of disinfection by-products in water samples. Water Res 2014; 59:90-8. [PMID: 24793107 DOI: 10.1016/j.watres.2014.04.006] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [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: 12/20/2013] [Revised: 04/02/2014] [Accepted: 04/04/2014] [Indexed: 05/27/2023]
Abstract
The formation of disinfection by-products (DBPs) is a public health concern due to their potential adverse health effects. Robust and sensitive methods for the analysis of DBPs, as well as appropriate sample handling procedures, are essential to obtain accurate, precise and reliable data on DBP occurrence and formation. In particular, the use of an appropriate quenching agent is critical to prevent further formation of DBPs during the holding time between sample collection and analysis. Despite reports of decomposition of DBPs caused by some quenching agents, particularly sulphite and thiosulphate, a survey of the literature shows that they are still the most commonly used quenching agents in analysis of DBPs. This study investigated the effects of five quenching agents (sodium sulphite, sodium arsenite, sodium borohydride, ascorbic acid, and ammonium chloride) on the stability of seven different classes of DBPs commonly found in drinking waters, in order to determine the most appropriate quenching agent for the different classes of DBPs. All of the quenching agents tested did not adversely affect the concentrations of trihalomethanes (THMs) and haloacetic acids (HAAs), and thus are suitable for quenching of disinfectant residual prior to analysis of these DBPs. Ascorbic acid was found to be suitable for the analysis of haloacetonitriles (HANs) and haloketones (HKs), but should not be used for the analysis of chlorite. Sodium arsenite, sodium borohydride, and ascorbic acid were all acceptable for the analysis of haloacetaldehydes (HALs). All of the quenching agents tested adversely affected the concentration of chloropicrin. A 'universal' quenching agent, suitable for all groups of DBPs studied, was not identified. However, based on the results of this study, we recommend the use of ascorbic acid for quenching of samples to be analysed for organic DBPs (i.e. THMs, HAAs, HANs, HKs, and HALs) and sodium sulphite for analysis of inorganic DBPs. Our study is the first comprehensive study on the effects of quenching agents on the stability of DBPs involving a wide range of DBP classes and quenching agents.
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Affiliation(s)
- Ina Kristiana
- Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Kent Street, Bentley 6102, Perth, Australia.
| | - Arron Lethorn
- Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Kent Street, Bentley 6102, Perth, Australia
| | - Cynthia Joll
- Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Kent Street, Bentley 6102, Perth, Australia
| | - Anna Heitz
- Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Kent Street, Bentley 6102, Perth, Australia
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MacNair AJ, Tran MM, Nelson JE, Sloan GU, Ironmonger A, Thomas SP. Iron-catalysed, general and operationally simple formal hydrogenation using Fe(OTf)3 and NaBH4. Org Biomol Chem 2014; 12:5082-8. [PMID: 24914735 PMCID: PMC4295815 DOI: 10.1039/c4ob00945b] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 05/23/2014] [Indexed: 11/21/2022]
Abstract
An operationally simple and environmentally benign formal hydrogenation protocol has been developed using highly abundant iron(iii) salts and an inexpensive, bench stable, stoichiometric reductant, NaBH4, in ethanol, under ambient conditions. This reaction has been applied to the reduction of terminal alkenes (22 examples, up to 95% yield) and nitro-groups (26 examples, up to 95% yield). Deuterium labelling studies indicate that this reaction proceeds via an ionic rather than radical mechanism.
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Affiliation(s)
- Alistair J. MacNair
- School of Chemistry , University of Edinburgh , Joseph Black Building , West Mains Road , Edinburgh EH9 3JJ , UK . ; Fax: +44 (0)131 650 6453
| | - Ming-Ming Tran
- School of Chemistry , University of Edinburgh , Joseph Black Building , West Mains Road , Edinburgh EH9 3JJ , UK . ; Fax: +44 (0)131 650 6453
| | - Jennifer E. Nelson
- School of Chemistry , University of Edinburgh , Joseph Black Building , West Mains Road , Edinburgh EH9 3JJ , UK . ; Fax: +44 (0)131 650 6453
| | - G. Usherwood Sloan
- School of Chemistry , University of Edinburgh , Joseph Black Building , West Mains Road , Edinburgh EH9 3JJ , UK . ; Fax: +44 (0)131 650 6453
| | - Alan Ironmonger
- Research and Development , GlaxoSmithKline , Gunnelswood Road , Stevenage SG1 2NY , UK
| | - Stephen P. Thomas
- School of Chemistry , University of Edinburgh , Joseph Black Building , West Mains Road , Edinburgh EH9 3JJ , UK . ; Fax: +44 (0)131 650 6453
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D'Anna V, Spyratou A, Sharma M, Hagemann H. FT-IR spectra of inorganic borohydrides. Spectrochim Acta A Mol Biomol Spectrosc 2014; 128:902-906. [PMID: 24717677 DOI: 10.1016/j.saa.2014.02.130] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [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: 10/18/2013] [Revised: 02/04/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
Inorganic compounds with BH4(-) ions are the subject of many recent investigations in the context of potential hydrogen storage materials. In this work, Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectra of a series of reference and research compounds (including deuterated samples) are collected and made available to the research community.
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Affiliation(s)
- Vincenza D'Anna
- Département de chimie physique, Sciences II, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland.
| | - Alexandra Spyratou
- Département de chimie physique, Sciences II, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
| | - Manish Sharma
- Département de chimie physique, Sciences II, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
| | - Hans Hagemann
- Département de chimie physique, Sciences II, Université de Genève, 30, Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland.
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47
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Yao T, Cui T, Wang H, Xu L, Cui F, Wu J. A simple way to prepare Au@polypyrrole/Fe3O4 hollow capsules with high stability and their application in catalytic reduction of methylene blue dye. Nanoscale 2014; 6:7666-7674. [PMID: 24899540 DOI: 10.1039/c4nr00023d] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Metal nanoparticles are promising catalysts for dye degradation in treating wastewater despite the challenges of recycling and stability. In this study, we have introduced a simple way to prepare Au@polypyrrole (PPy)/Fe3O4 catalysts with Au nanoparticles embedded in a PPy/Fe3O4 capsule shell. The PPy/Fe3O4 capsule shell used as a support was constructed in one-step, which not only dramatically simplified the preparation process, but also easily controlled the magnetic properties of the catalysts through adjusting the dosage of FeCl2·4H2O. The component Au nanoparticles could catalyze the reduction of methylene blue dye with NaBH4 as a reducing agent and the reaction rate constant was calculated through the pseudo-first-order reaction equation. The Fe3O4 nanoparticles permitted quick recycling of the catalysts with a magnet due to their room-temperature superparamagnetic properties; therefore, the catalysts exhibited good reusability. In addition to catalytic activity and reusability, stability is also an important property for catalysts. Because both Au and Fe3O4 nanoparticles were wrapped in the PPy shell, compared with precursor polystyrene/Au composites and bare Fe3O4 nanoparticles, the stability of Au@PPy/Fe3O4 hollow capsules was greatly enhanced. Since the current method is simple and flexible to create recyclable catalysts with high stability, it would promote the practicability of metal nanoparticle catalysts in industrial polluted water treatment.
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Affiliation(s)
- Tongjie Yao
- The Academy of Fundamental and Interdisciplinary Science, Harbin Institute of Technology, Harbin, Heilongjiang 150080, People's Republic of China.
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48
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Abstract
Pre-formed silver-boron nanoparticles of 22 nm form pearl-like necklace nanostructures with interparticle junctions of less than 10 nm length in the matrix of polyethylene glycol (8000 Da). The silver necklace nanostructure is stable at 37 °C or 70 °C and also inside a live cell medium. A polyethylene glycol matrix with a shorter chain length (1000 Da) does not protect the nanoparticles against attraction, and random aggregates are formed. Silver necklace nanostructures exhibit strong Raman enhancement by more than ∼10(9) which is much higher than for silver-citrate or random silver-boron aggregates. The polymeric matrix of 8000 Da contributes strongly to the electromagnetic field enhancement and removes the chemical contribution to the surface Raman scattering increase. The stable interparticle junctions act as local hot spots for strong Raman scattering signals collected from live fibroblasts and allow systematic in situ studies.
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Affiliation(s)
- Darya Radziuk
- Max-Planck Institute of Colloids and Interfaces, Department of Interfaces, D14476 Potsdam, Germany.
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49
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Abstract
We established a method to determine the glycosyl linkage structure by a combination of Smith degradation and liquid chromatography-electrospray ionization-quadrupole-time of flight-mass spectrometry (LC-ESI-Q-TOF-MS) and tandem MS (MS/MS). To assign the sugar linkage of N-glycoprotein, we employed a typical ribonuclease B containing oligosaccharides (Man5-9GlcNAc2). Tryptic digestion of ribonuclease B provided a mixture of high-mannose glycopeptides consisting of the four amino acids, Asn34-Leu-Thr-Lys37 (NLTK, T6). The mixture of glycopeptides was separated by high-performance liquid chromatography (HPLC) in a reversed phase column and was characterized by ESI-Q-TOF-MS and MS/MS. Comparison of the data with and without Smith degradation allowed us to make reasonable assignments to support such linkage patterns as (1-->2), (1-->3), (1-->6) and their multiples. These assignments were limited to six mannoses or lower due to the unstable nature of the higher derivatives. This method should be applicable to determine the linkage pattern of an unknown glycoprotein in about a 6-microgram amount.
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Affiliation(s)
- Suthasinee Pitchayawasin
- Laboratory of Organic Chemistry, School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Yilmaz V, Arslan Z, Rose L, Little MD. Cyanovanadate(III) complexes as novel additives for efficient generation of volatile cadmium species in complex samples prior to determinations by inductively coupled plasma mass spectrometry (ICP-MS). Talanta 2014; 115:681-7. [PMID: 24014893 DOI: 10.1016/j.talanta.2013.06.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A new method has been described for generation of volatile species of Cd using vanadium(III) cyanide complex. Aqueous solutions of 0.04 mol L(-1) vanadium chloride (VCl3) and 0.12 mol L(-1) potassium cyanide (KCN) were reacted on-line yielding a suspension of vanadium hydroxide, V(OH)3. This suspension was dissolved along the stream of sample solution in dilute HCl to form heptacyanovanadate(III) complex, [V(CN)7]4-. Volatile Cd species were generated by reacting the stream of sample solution and cyanovanadate(III) complex with sodium borohydride (NaBH4). Feasibility of off-line and on-online approaches was investigated for quantitative determinations. Better precision and daily stability were achieved with on-line settings. Optimum signals were obtained from sample solutions within a range of 3 to 5% v/v HCl. A concentration of 2% m/v NaBH4 was adequate to achieve an enhancement of 20-fold in the presence of cyanovanadate(III) complex. The limits of detection were 5.0 and 4.5 ng L(-1) for 110Cd and 111Cd isotopes, respectively. Precision (%RSD) was better than 4.7% for six replicate measurements. The interferences of Cu(II) and Ni(II) were marginal (<10%) at 1.0 µg mL(-1). Depressive effects from Bi, Se and Sn were not significant below 0.1 µg mL(-1). The method was validated by determination of Cd using ICP-MS in certified reference materials of Nearshore seawater (CASS-4), Bone ash (SRM 1400), Dogfish liver (DOLT-4) and Mussel tissue (SRM 2976).
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