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Boric acid

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https://www.readbyqxmd.com/read/29328646/vibrational-properties-of-bulk-boric-acid-2a-and-3t-polymorphs-and-their-two-dimensional-layers-measurements-and-density-functional-theory-calculations
#1
Mauricelio Bezerra da Silva, Regina C R Santos, Paulo T C Freire, Ewerton W S Caetano, Valder N Freire
Boric acid (H3BO3) is being used effectively nowadays in traps/baits for the management of Aedes aegypti L. and Aedes albopictus Skuse species of mosquitoes, which are the main spreading vectors worldwide for diseases like malaria, dengue and zika. Previously, we have published results on the structural, electronic and optical properties of its molecular triclinic H3BO3-2A and trigonal H3BO3-3T polymorphs within the framework of density functional theory (DFT). Due to the renewed importance of these materials, the focus of this work is on the vibrational properties of the bulk boric acid 2A and 3T polymorphs...
January 12, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29281044/radiobiological-response-of-u251mg-cho-k1-and-v79-cell-lines-to-accelerator-based-boron-neutron-capture-therapy
#2
Eisuke Sato, Alexander Zaboronok, Tetsuya Yamamoto, Kei Nakai, Sergey Taskaev, Olga Volkova, Ludmila Mechetina, Alexander Taranin, Vladimir Kanygin, Tomonori Isobe, Bryan J Mathis, Akira Matsumura
In the current article, we provide in vitro efficacy evaluation of a unique accelerator-based neutron source, constructed at the Budker Institute of Nuclear Physics (Novosibirsk, Russian Federation), for boron neutron capture therapy (BNCT), which is particularly effective in the case of invasive cancers. U251MG, CHO-K1 and V79 cells were incubated and irradiated in various concentrations of boric acid with epithermal neutrons for 2-3 h in a plexiglass phantom, using 2.0 MeV proton energy and 1.5-3.0 mA proton current, resulting in a neutron fluence of 2...
December 21, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/29235137/development-of-hplc-with-fluorescent-detection-using-nbd-f-for-the-quantification-of-colistin-sulfate-in-rat-plasma-and-its-pharmacokinetic-applications
#3
Sui Ouchi, Kazuaki Matsumoto, Maki Okubo, Yuta Yokoyama, Junko Kizu
Colistin sulfate, composed of a mixture of colistin A sulfate (CLA) and colistin B sulfate (CLB), is available for treating life-threatening infections caused by multidrug-resistant Gram-negative bacteria. In this study, the CLA and CLB were quantified separately. Colistin sulfate was extracted from rat plasma with a solid-phase extraction C18 cartridge and reacted with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F), and the fluorescent derivatives were subjected to reversed phase high-performance liquid chromatography analysis and used to investigate the pharmacokinetics of CLA and CLB in rat plasma...
December 12, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29224767/lugol-s-solution-eradicates-staphylococcus-aureus-biofilm-in%C3%A2-vitro
#4
Torstein Grønseth, Lene K Vestby, Live L Nesse, Even Thoen, Olivier Habimana, Magnus von Unge, Juha T Silvola
OBJECTIVES: The aim of the study was to evaluate the antibacterial efficacy of Lugol's solution, acetic acid, and boric acid against Staphylococcus aureus biofilm. METHODS: The efficacy of Lugol's solution 1%, 0.1%, and 0.05%, acetic acid 5% or boric acid 4.7% for treatment of Staphylococcus aureus biofilm in vitro was tested using 30 clinical strains. Susceptibility in the planktonic state was assessed by disk diffusion test. Antiseptic effect on bacteria in biofilm was evaluated by using a Biofilm-oriented antiseptic test (BOAT) based on metabolic activity, a biofilm bactericidal test based on culturing of surviving bacteria and confocal laser scanning microscopy combined with LIVE/DEAD staining...
December 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29223972/intravaginal-boric-acid-is-it-an-alternative-therapeutic-option-for-vaginal-trichomoniasis
#5
Nicola Thorley, Jonathan Ross
OBJECTIVES: Trichomoniasis, caused by Trichomonas vaginalis (TV), is the most common curable sexually transmitted infection worldwide. Current guidance in the UK is to treat TV with a nitroimidazole antibiotic. The high prevalence of TV, high rate of antibiotic resistance and limited tolerability to nitroimidazoles suggest that alternative treatment regimens are needed. Intravaginal boric acid (BA) has been used safely for the treatment of candida vulvovaginitis and bacterial vaginosis, and in vitro studies suggest BA is active against TV...
December 9, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/29215799/comparison-of-prestoblue%C3%A2-and-plating-method-to-evaluate-antimicrobial-activity-of-ascorbic-acid-boric-acid-and-curcumin-in-an-in-vitro-gastrointestinal-model
#6
Daniel Hernandez-Patlan, Bruno Solis-Cruz, Abraham Méndez-Albores, Juan D Latorre, Xochitl Hernandez-Velasco, Guillermo Tellez, Raquel López-Arellano
AIMS: To compare the conventional plating method versus a fluorometric method using PrestoBlue® as a dye by determining the antimicrobial activity of two organic acids and curcumin against Salmonella Enteritidis in an avian in vitro digestion model that simulates the crop, proventriculus and intestine. METHODS AND RESULTS: A concentration of 108 cfu ml-1 of S. Enteritidis was exposed to groups with different rates of ascorbic acid, boric acid and curcumin. Significant differences were observed when the means of the treatments were compared with the controls in the compartments that simulate the crop and intestine (P < 0...
December 7, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29210602/assessment-of-the-comparability-of-clsi-eucast-and-stokes-antimicrobial-susceptibility-profiles-for-escherichia-coli-uropathogenic-isolates
#7
C O'Halloran, N Walsh, M C O'Grady, L Barry, C Hooton, G D Corcoran, B Lucey
BACKGROUND: As many clinical laboratories convert between Stokes, Clinical and Laboratory Standards Institute (CLSI) and European Committee for Antimicrobial Susceptibility Testing (EUCAST) methods, the problem of comparing differently derived sets of antimicrobial susceptibility testing (AST) data with each other arises, owing to a scarcity of knowledge of inter-method comparability. The purpose of the current study was to determine the comparability of CLSI, EUCAST and Stokes AST methods for determining susceptibility of uropathogenic Escherichia coli to ampicillin, amoxicillin-clavulanate, trimethoprim, cephradine/cephalexin, ciprofloxacin and nitrofurantoin...
December 6, 2017: British Journal of Biomedical Science
https://www.readbyqxmd.com/read/29204148/insights-into-the-mechanisms-underlying-boron-homeostasis-in-plants
#8
REVIEW
Akira Yoshinari, Junpei Takano
Boron is an essential element for plants but is toxic in excess. Therefore, plants must adapt to both limiting and excess boron conditions for normal growth. Boron transport in plants is primarily based on three transport mechanisms across the plasma membrane: passive diffusion of boric acid, facilitated diffusion of boric acid via channels, and export of borate anion via transporters. Under boron -limiting conditions, boric acid channels and borate exporters function in the uptake and translocation of boron to support growth of various plant species...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29196901/an-improved-solvent-free-synthesis-of-flunixin-and-2-arylamino-nicotinic-acid-derivatives-using-boric-acid-as-catalyst
#9
Mahsa Yarhosseini, Shahrzad Javanshir, Zahra Dolatkhah, Mohammad G Dekamin
A simple solvent-free protocol for the preparation of flunixin, a potent non-narcotic, non-steroidal anti-inflammatory drugs is reported using boric acid as catalyst. Its salt, flunixin meglumine are then prepared under reflux in EtOH. This sustainable method are then extended for the synthesis of a series of 2-(arylamino) nicotinic acid derivatives. The present protocol combines non-hazardous neat conditions with associated benefits like excellent yield, straightforward workup, and use of readily available and safe catalyst in the absence of any solvent, which are important factors in the pharmaceutical industry...
December 1, 2017: Chemistry Central Journal
https://www.readbyqxmd.com/read/29188638/-preparation-processes-of-3-yttria-stabilized-tetragonal-zirconia-polycrystalline-ceramic-composite-powders-coated-with-nano-sized-al%C3%A2-o%C3%A2-boron-nitride
#10
Wu Jinshuang, Zhou Lei, Xing Helin, Wang Zhe, Dong Chaofang, Yang Sefei
OBJECTIVE: In this work, we aim to determine the optimum pH value for the preparation of 3% yttria-stabilized tetragonal zirconia polycrystalline (3Y-TZP)/3%Al₂O₃ and optimum calcination temperature of Al₂O₃ precursor and amorphous boron nitride (BN) for Al₂O₃-BN coating 3Y-TZP powders. METHODS: The 3Y-TZP/3%Al₂O₃ composite powders were prepared through the heterogeneous precipitation method under different pH values (6.5, 7.5, 8.5, and 9.5) and analyzed through transmission electron microscopy (TEM) to determine the optimum coating morphology...
October 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29178304/application-of-ph-zone-refining-countercurrent-chromatography-in-the-chiral-separation-of-two-%C3%AE-adrenergic-blocking-agents
#11
Liqiong Lv, Zhisi Bu, Wenyu Sun, Chaoyue Wang, Cong Xu, Shengqiang Tong
Two β-adrenergic blocking agents, 1-[(1-methylethyl)amino]-3-phenoxy-2-propanol (1) and 1-[(1-methylethyl)amino]-3-(3-methylphenoxy)-2-propanol (2; Toliprolol), were enantioseparated by pH-zone-refining countercurrent chromatography. A two-phase solvent system composed of chloroform containing 0.10 mol L-1 of di-n-hexyl l-tartrate/0.10 mol L-1 of boric acid aqueous solution (1:1, v/v) was selected, in which 20 mmol L-1 triethylamine was added in the organic phase as a retainer and 2 mmol L-1 HCl was added in the aqueous phase as an eluter...
November 27, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29152794/highly-sustainable-zinc-anodes-for-the-rechargeable-hybrid-aqueous-battery
#12
Kyung Eun Kate Sun, Tuan Hoang, The Nam Long Doan, Yan Yu, Pu Chen
The synthesis of novel zinc electrodes has been successfully implemented by the electroplating method with the aid of inorganic additives in the electroplating solution. The selected inorganic additives are indium sulfate, tin oxide, and boric acid. From X-ray diffraction results, the synthesized zinc electrodes prefer (002) and/or (103) crystallographic orientations, representing basal morphology and high resistance to dendrite growth. The corrosion rates of these electroplated zinc samples decrease as much as 11 times smaller than the rate of a zinc foil when the zinc materials are in contact with the aqueous electrolyte of a rechargeable hybrid aqueous battery (ReHAB)...
November 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29136885/an-inorganic-boronate-affinity-in-needle-monolithic-device-for-specific-capture-of-cis-diol-containing-compounds
#13
Shanxia Jin, Wei Zhang, Qin Yang, Lili Dai, Ping Zhou
In this work, inorganic boronate affinity monolith was prepared by in situ synthesis in 0.33mm i.d. stainless steel needle through sol-gel process using tetraethoxysilane and tetrabutyl orthotitanate as the co-precursors. The morphology, structure and composition of the monolith were characterized. In contrast to conventional boronate affinity materials, inorganic boric acid was used as affinity ligand. Different compounds were used for the evaluation of the boronate affinity of this inorganic monolithic material...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136799/ratiometric-fluorescence-and-visual-imaging-detection-of-dopamine-based-on-carbon-dots-copper-nanoclusters-dual-emitting-nanohybrids
#14
Weijie He, Rijun Gui, Hui Jin, Benqian Wang, Xiangning Bu, Yongxin Fu
In this article, blue-emitting carbon dots (CDs) were prepared via hydrothermal treatment of sodium citrate and NH4HCO3, and then combined with 3-aminophenylboronic acid (APBA) to prepare APBA modified-CDs. APBA acted as the receptor of dopamine (DA). Using bovine serum albumin (BSA) as a stabilizer and N2H4·H2O as a reducing reagent, BSA-stabilized and red-emitting copper nanoclusters (CuNCs) were prepared. By carbodiimide-activated coupling, novel nanohybrids consisting of CDs and CuNCs were constructed and exhibited dual-emitting fluorescence (FL)...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29119879/magnesium-and-zinc-borate-enhance-osteoblastic-differentiation-of-stem-cells-from-human-exfoliated-deciduous-teeth-in-vitro
#15
Yao-Jen Liu, Wen-Ta Su, Po-Hung Chen
Various biocompatible and biodegradable scaffolds blended with biochemical signal molecules with adequate osteoinductive and osteoconductive properties have attracted significant interest in hard tissue engineering regeneration. We evaluated the distinct effects of magnesium borate, zinc borate, and boric acid blended into chitosan scaffold for osteogenic differentiation of stem cells from exfoliated deciduous teeth. Stem cells from exfoliated deciduous teeth cells are a potential source of functional osteoblasts for applications in bone tissue engineering, but the efficiency of osteoblastic differentiation is low, thereby significantly limiting their clinical applications...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29110363/synthesis-receptor-binding-studies-optical-spectroscopic-and-in-silico-structural-characterization-of-morphiceptin-analogs-with-cis-4-amino-l-proline-residues
#16
Anna Adamska-Bartłomiejczyk, Attila Borics, Csaba Tömböly, Szabolcs Dvorácskó, Marek Lisowski, Alicja Kluczyk, Grzegorz Wołczański, Justyna Piekielna-Ciesielska, Anna Janecka
Three novel morphiceptin analogs, in which Pro in position 2 and/or 4 was replaced by cis-4-aminoproline connected with the preceding amino acid through the primary amino group, were synthesized. The opioid receptor affinities, functional assay results, enzymatic degradation studies and experimental and in silico structural analysis of such analogs are presented. Copyright © 2017 European Peptide Society and John Wiley & Sons, Ltd.
November 7, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/29109778/a-h2o2-responsive-theranostic-probe-for-endothelial-injury-imaging-and-protection
#17
Cheng-Kun Wang, Juan Cheng, Xing-Guang Liang, Chao Tan, Quan Jiang, Yong-Zhou Hu, Ying-Mei Lu, Kohji Fukunaga, Feng Han, Xin Li
Overproduction of H2O2 causes oxidative stress and is the hallmark of vascular diseases. Tracking native H2O2 in the endothelium is therefore indispensable to gain fundamental insights into this pathogenesis. Previous fluorescent probes for H2O2 imaging were generally arylboronates which were decomposed to emissive arylphenols in response to H2O2. Except the issue of specificity challenged by peroxynitrite, boric acid by-produced in this process is actually a waste with unknown biological effects. Therefore, improvements could be envisioned if a therapeutic agent is by-produced instead...
2017: Theranostics
https://www.readbyqxmd.com/read/29095448/synthesis-structural-characterization-and-scalable-preparation-of-new-amino-zinc-borates
#18
M R Imer, M González, N Veiga, C Kremer, L Suescun, L Arizaga
Zinc borates are very important industrial materials with applications that include fire retardants and preservatives in wood. In this work, we report the preparation of three novel zinc borates: [Zn(NH3)3B4O5(OH)4]·H2O (ZB1), Zn3(H2B3O7)2·2NH3·4H2O (ZB2), and [Zn(NH3)4][B4O5(OH)4]·4H2O (ZB3). The solid phases were characterized by elemental analysis, X-ray diffraction, infrared and Raman spectroscopy, scanning electron microscopy and thermal analysis. The crystal structures of ZB1 (monoclinic, Cc, a = 12...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29067813/gas-permeable-membrane-based-conductivity-probe-capable-of-in-situ-real-time-monitoring-of-ammonia-in-aquatic-environments
#19
Tianling Li, Jared Panther, Yuan Qiu, Chang Liu, Jianyin Huang, Yonghong Wu, Po Keung Wong, Taicheng An, Shanqing Zhang, Huijun Zhao
Aquatic ammonia has toxic effects on aquatic life. This work reports a gas-permeable membrane-based conductivity probe (GPMCP) developed for real-time monitoring of ammonia in aquatic environments. The GPMCP innovatively combines a gas-permeable membrane with a boric acid receiving phase to selectively extract ammonia from samples and form ammonium at the inner membrane interface. The rate of the receiving phase conductivity increase is directly proportional to the instantaneous ammonia concentration in the sample, which can be rapidly and sensitively determined by the embedded conductivity detector...
November 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29061819/effect-of-tumor-microenvironment-on-selective-uptake-of-boric-acid-in-hepg2-human-hepatoma-cells
#20
Yu-Chi Bai, Yu-Chun Hsia, Yu-Ting Lin, Kuan-Hao Chen, Fong-In Chou, Chia-Min Yang, Yung-Jen Chuang
BACKGROUND: Feasibility and efficacy of boric acid (BA)-mediated boron neutron capture therapy (BNCT) was first demonstrated by eliminating hepatocellular carcinoma (HCC) in a rat model. Furthermore, selective uptake of BA by liver tumor cells was shown in a rabbit model. To gain further insight, this study aimed to investigate the mechanisms of transportation and selective uptake of BA in HepG2 liver tumor cells. MATERIALS AND METHODS: Transportation of BA in HepG2 cells was analyzed by time-course assays and by analyzing the rate of diffusion versus the concentration of BA...
November 2017: Anticancer Research
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