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https://www.readbyqxmd.com/read/28823107/fluorescent-labeling-of-protein-using-blue-emitting-8-amino-bodipy-derivatives
#1
Dokyoung Kim, Donghee Ma, Muwoong Kim, Yuna Jung, Na Hee Kim, Chiho Lee, Seo Won Cho, Sungnam Park, Youngbuhm Huh, Junyang Jung, Kyo Han Ahn
8-Amino-BODIPY (boron-dipyrromethane) dyes show bright blue fluorescence. Disclosed here are synthesis and characterization of the photophysical properties of a series of functionalized 8-Amino-BODIPY (BP1-4) for protein labeling. The compact structure and solvent-insensitive absorption property of the dye are desirable features for protein labeling. For the model protein, bovine serum albumin (BSA), the labeling proceeds under mild condition via amide bond formation or thiol-ene conjugation with maintaining the bright blue fluorescence...
August 19, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28822861/tuning-electronic-properties-of-boron-nitride-nanoplate-via-doping-carbon-for-enhanced-adsorptive-performance
#2
Jingyu Pang, Yanhong Chao, Honghong Chang, Hongping Li, Jun Xiong, Minqiang He, Qi Zhang, Huaming Li, Wenshuai Zhu
In this paper, the carbon-doped boron nitride nanoplate (C-BNNP) was prepared by pyrolyzing the precursor under N2 and served as an excellent adsorbent for removal of Rhodamine B (RhB). The structure and composition of C-BNNP were characterized and its adsorption behavior for RhB was investigated. Compared with boron nitride nanoplate (BNNP) which was synthesized under NH3, C-BNNP displayed an enhancement of the adsorption capacity for RhB (833mg/g). The adsorption activity was comprehensibly studied by kinetics, isotherm and thermodynamics...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28822313/a-selective-glucose-sensor-based-on-direct-oxidation-on-a-bimetal-catalyst-with-a-molecular-imprinted-polymer
#3
Seong Je Cho, Hui-Bog Noh, Mi-Sook Won, Chul-Ho Cho, Kwang Bok Kim, Yoon-Bo Shim
A selective nonenzymatic glucose sensor was developed based on the direct oxidation of glucose on hierarchical CuCo bimetal-coated with a glucose-imprinted polymer (GIP). Glucose was introduced into the GIP composed of Nafion and polyurethane along with aminophenyl boronic acid (APBA), which was formed on the bimetal electrode formed on a screen-printed electrode. The extraction of glucose from the GIP allowed for the selective permeation of glucose into the bimetal electrode surface for oxidation. The GIP-coated bimetal sensor probe was characterized using electrochemical and surface analytical methods...
August 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28821795/unconventional-fractional-quantum-hall-effect-in-bilayer-graphene
#4
Janusz Edward Jacak
Recent experimental progress in Hall measurements in bilayer graphene in the so-called open-face configuration of boron nitride encapsulated samples, together with the earlier technique of suspended samples, allows for precise observation of the fractional quantum Hall effect (FQHE) in all 4 subbands of the Lowest Landau level (with n = 0 and n = 1) and in the next LL subbands (with n = 2) in the bilayer system. Many newly observed FQHE features do not agree with a conventional model of composite fermions and reveal a different hierarchy in comparison to monolayer graphene or GaAs 2DEG...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821068/radiation-synthesis-and-performance-of-novel-cellulose-based-microsphere-adsorbents-for-efficient-removal-of-boron-iii
#5
Siqi Liu, Min Xu, Tianlin Yu, Dong Han, Jing Peng, Jiuqiang Li, Maolin Zhai
A novel cellulose-based microsphere containing glucamine groups, referred as CVN, was successfully synthesized by radiation-induced graft polymerization of 4-vinylbenzyl chloride onto cellulose microspheres and subsequent functionalization with N-methyl-d-glucamine. The adsorption by CVN for boron (III) from aqueous solutions was evaluated systematically by batch adsorption technique. Langmuir models could fit well with the adsorption behavior of CVN. The CVN adsorbents exhibited a high adsorption capacity up to 12...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820487/copper-catalyzed-synthesis-of-unsymmetrical-diorganyl-chalcogenides-te-se-s-from-boronic-acids-under-solvent-free-conditions
#6
Sumbal Saba, Giancarlo Vaccari Botteselle, Marcelo Godoi, Tiago Elias Allievi Frizon, Fábio Zazyki Galetto, Jamal Rafique, Antonio L Braga
The efficient and mild copper-catalyzed synthesis of unsymmetrical diorganyl chalcogenides under ligand- and solvent-free conditions is described. The cross-coupling reaction was performed using aryl boric acids and 0.5 equiv. of diorganyl dichalcogenides (Te/Se/S) in the presence of 3 mol % of CuI and 3 equiv. of DMSO, under microwave irradiation. This new protocol allowed the preparation of several unsymmetrical diorganyl chalcogenides in good to excellent yields.
August 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28820241/interactions-of-verkade-s-superbase-with-strong-lewis-acids-from-labile-mono-and-binuclear-lewis-acid-base-complexes-to-phosphenium-cations
#7
Suresh Mummadi, Dustin Kenefake, Rony Diaz, Daniel K Unruh, Clemens Krempner
A series of mono- and binuclear Lewis acid-base complexes of the formulas N[CH2CH2N(Pr(i))]3P→LA [LA = BH3 (8), Ga(C6F5)3 (10), GaCl3 (11)], LA←N[CH2CH2N(Pr(i))]3P [LA = Al(C6F5)3 (6a), AlMe3 (6b), AlEt3 (6c), AlBu(i)3 (6d), BF3 (13)], and LA←N[CH2CH2N(Pr(i))]3P→LA [Lewis acid (LA) = Al(C6F5)3 (7a), AlMe3 (7b), AlEt3 (7c), AlBu(i)3 (7d), AlCl3 (7e), BH3 (9)] were generated from reactions of Verkade's base, N[CH2CH2N(Pr(i))]3P (1), with various boron-, aluminum-, and gallium-containing Lewis acids, and characterized by multinuclear NMR spectroscopy...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28816447/sequential-functionalizations-of-carbohydrates-enabled-by-boronic-esters-as-switchable-protective-activating-groups
#8
Ross S Mancini, Jessica B Lee, Mark S Taylor
Processes for site-selective, sequential functionalizations of carbohydrate derivatives are described. In these processes, a tricoordinate boronic ester initially serves as a protective group for a sugar-derived 1,2- or 1,3-diol motif, permitting functionalization of free OH groups. In a second step, addition of a Lewis base generates a tetracoordinate adduct, which serves as an activating group, enabling functionalization of one of the boron-bound oxygen atoms by a second electrophile. By combining an initial acylation, alkylation, or glycosylation step with an amine-mediated glycosylation of the boronic ester, a variety of selectively protected di- and trisaccharide derivatives can be accessed in an operationally simple fashion without purification of intermediates...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28815881/corrigendum-photoinduced-dna-interstrand-cross-link-formation-by-naphthalene-boronates-via-a-carbocation
#9
Yibin Wang, Zechao Lin, Heli Fan, Xiaohua Peng
No abstract text is available yet for this article.
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28812899/synthesis-and-characterization-of-a-boron-nitrogen-boron-zigzag-edged-benzo-fg-tetracene-motif
#10
Michael Fingerle, Cäcilia Maichle-Mössmer, Simon Schundelmeier, Bernd Speiser, Holger F Bettinger
The boron-nitrogen-boron (BNB) zigzag edged benzo[fg]tetracene is accessible from 4-butyl-2,6-diphenylaniline in four steps in good yields. The two mesityl groups stabilize the boron centers toward nucleophilic attack and result in two enantiomeric forms in the solid state. The title compound has a large optical gap, shows blue fluorescence, and is quite resistant toward oxidation and reduction.
August 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/28812893/%C3%AE-sulfinyl-benzoates-as-precursors-to-li-and-mg-carbenoids-for-the-stereoselective-iterative-homologation-of-boronic-esters
#11
Giorgia Casoni, Murat Kucukdisli, James M Fordham, Matthew Burns, Eddie L Myers, Varinder K Aggarwal
The stereoselective reagent-controlled homologation of boronic esters is one of a small number of iteratable synthetic transformations that if automated could form the basis of a veritable molecule-making machine. Recently, α-stannyl triisopropylbenzoates and α-sulfinyl chlorides have emerged as useful building blocks for the iterative homologation of boronic esters. However, α-stannyl benzoates need to be prepared using stoichiometric amounts of the (+)- or (-)-enantiomer of the scarcely available and expensive diamine sparteine; also, these building blocks, together with the byproducts that are generated during homologation, are perceived as being toxic...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28812877/scru2b3-and-sc2rub6-borides-featuring-a-2d-infinite-boron-clustering
#12
Leonid P Salamakha, Oksana Sologub, Berthold Stöger, Peter Franz Rogl, Monika Waas, Volodymyr B Kapustianyk, Ernst Bauer
Two borides, ScRu2B3 and Sc2RuB6, were obtained by argon-arc melting of the elements followed by annealing at 800 °C. ScRu2B3 exhibits a new structure type with the space group Cmcm (a = 3.0195(2) Å, b = 15.4056(8) Å, c = 5.4492(3) Å; single crystal X-ray data; RF(2) = 0.0105). Sc2RuB6 adopts the Y2ReB6-type structure (space group Pbam; a = 8.8545(2) Å, b = 11.1620(3) Å, c = 3.4760(1) Å; single crystal X-ray data; RF(2) = 0.0185). ScRu2B3 displays an unusual intergrowth of CeCo3B2- and AlB2-related slabs; a striking feature is a boat configuration of puckered boron hexagons within infinite graphite like boron layers (6(3) nets)...
August 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#13
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812245/association-of-elements-with-schizophrenia-and-intervention-of-selenium-supplements
#14
Zhe Li, Yumei Liu, Xia Li, Wen Ju, Guanrui Wu, Xiaomei Yang, Xiaofeng Fu, Xibao Gao
The purpose of this study is to explore more trace elements (zinc, potassium, copper, iron, boron, manganese, selenium, chromium and cadmium elements) in addition to calcium, magnesium, lead and arsenic in the sera of patients with schizophrenia and the general population in China and to determine the effect of selenium on schizophrenia patients. Participants were collected from the Pingyin County Mental Health Hospital and Pingyin County. A t test was used to analyse the differences between schizophrenia patients and healthy subjects, and element content differences in gender...
August 15, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28812089/large-scale-all-polycrystalline-diamond-structures-transferred-onto-flexible-parylene-c-films-for-neurotransmitter-sensing
#15
Bin Fan, Yan Zhu, Robert Rechenberg, Cory A Rusinek, Michael F Becker, Wen Li
Boron-doped diamond (BDD) has superior electrochemical properties for bioelectronic systems. However, due to its high synthesis temperature, traditional microfabrication methods have limits to integrating BDD with emerging classes of flexible, polymer-based bioelectronic systems. This paper introduces a novel fabrication solution to this challenge, which features (i) a wafer-scale substrate transfer process with all diamond structures transferred onto a flexible Parylene-C substrate and (ii) Parylene anchors introduced to strengthen the bonding between BDD and Parylene substrates, as demonstrated by a peeling test...
August 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28812073/controllable-access-to-multi-substituted-imidazoles-via-palladium-ii-catalyzed-c-c-coupling-and-c-n-condensation-cascade-reactions
#16
Haihua Yu, Li Xiao, Xicheng Yang, Liming Shao
A novel and efficient protocol for the synthesis of various 2,4-disubstituted, 1,2,4-trisubstituted and 1,2,4,5-tetra-substituted imidazoles via cascade palladium catalyzed C-C coupling followed by intramolecular C-N bond formation was developed. Readily accessible boronic acids and N-substituted-2-aminoacetonitriles were firstly reported as starting materials to construct di-, tri-, and tetra-substituted imidazoles in good to excellent yield.
August 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28809569/rh-catalyzed-conjugate-addition-of-aryl-and-alkenyl-boronic-acids-to-%C3%AE-methylene-%C3%AE-lactones-stereoselective-synthesis-of-trans-3-4-disubstituted-%C3%AE-lactones
#17
Christian A Malapit, Irungu K Luvaga, Donald R Caldwell, Nicholas K Schipper, Amy R Howell
A one-step preparation of 3,4-disubstituted β-lactones through Rh-catalyzed conjugate addition of aryl or alkenyl boronic acids to α-methylene-β-lactones is described. The operationally simple, stereoselective transformation provides a broad range of β-lactones from individual α-methylene-β-lactone templates. This methodology allowed for a direct, final-step C-3 diversification of nocardiolactone, an antimicrobial natural product.
August 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/28809568/combinatorial-nickel-catalyzed-monofluoroalkylation-of-aryl-boronic-acids-with-unactivated-fluoroalkyl-iodides
#18
Jie Sheng, Hui-Qi Ni, Ge Liu, Yan Li, Xi-Sheng Wang
A combinatorial nickel-catalyzed cross-coupling between arylboronic acids and unactived 1-fluoro-1-iodoalkanes has been developed, which demonstrated high efficiency, mild conditions, and excellent functional-group compatibility. Readily available nitrogen and phosphine ligands were combined with a nitrogen source, which in situ generated a variety of easily tunable catalysts to promote the fluoroalkylation for broad scopes of both coupling partners. This new strategy on combinatorial catalysis offers new solutions for nickel-catalyzed cross-coupling reactions...
August 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/28809538/dynamic-covalent-hydrogels-for-triggered-cell-capture-and-release
#19
Fatemeh Karimi, Joe Collins, Daniel E Heath, Luke A Connal
A dual-responsive, cell capture and release surface was prepared through the incorporation of phenylboronic acid (PBA) groups into an oxime-based polyethylene glycol (PEG) hydrogel. Owing to its PEG-like properties, the unfunctionalized hydrogel was non-fouling. The use of the highly efficient oxime-click chemistry allows for the facile incorporation of commercially available 3,5-diformylphenyl boronic acid into the hydrogel matrix. Thus, the surface properties of the hydrogel were modified to enable reversible cell capture and release...
August 15, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28809470/chelation-controlled-additions-to-chiral-%C3%AE-and-%C3%AE-silyloxy-%C3%AE-halo-and-%C3%AE-vinyl-carbonyl-compounds
#20
Xinyuan Fan, Patrick J Walsh
The science and art of preventing and managing disease and prolonging life is dependent on advances in medicine, biology, and biochemistry. Many of these advances will involve interactions of small molecules with biological entities. As such, they will rely on the efficient synthesis of active compounds with very high stereochemical purity. Although enantioselective reactions are important in this regard, most stereocenters in complex molecule synthesis are installed in diastereoselective reactions. Perhaps the most well-known diastereoselective C-C bond-forming reaction is the addition of nucleophiles to carbonyl groups with α- or β-stereogenic centers...
August 15, 2017: Accounts of Chemical Research
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