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Boric acid

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https://www.readbyqxmd.com/read/29789967/amorphous-titania-modified-with-boric-acid-for-selective-capture-of-glycoproteins
#1
Shanxia Jin, Liping Liu, Ping Zhou
Amorphous titania was modified with boric acid, and the resulting material was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction and X-ray photoelectron spectrometry. The new material, in contrast to conventional boronate affinity materials containing boronic acid ligands, bears boric acid groups. It is shown to exhibit high specificity for glycoproteins, and this was applied to design a method for solid phase extraction of glycoproteins as shown for ribonuclease B, horse radish peroxidase and ovalbumin...
May 22, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29778893/synthesis-of-proline-derived-benzenesulfonamides-a-potent-anti-trypanosoma-brucei-gambiense-agent
#2
David I Ugwu, Uchechukwu C Okoro, Narendra K Mishra
Thousands of death in Africa and other developing nations are still attributed to trypanosomiasis. Excessive sleep has been associated with increased inflammation. We report herein, the synthesis, antitrypanosomal and anti-inflammatory activities of eight new carboxamide derivatives bearing substituted benzenesulfonamides. The base promoted reactions of l-proline and L-4-hydroxyproline with substituted benzenesulfonyl chlorides gave the benzenesulfonamides (11a-h) in excellent yields. Boric acid mediated amidation of the benzenesulfonamides (11a-h) and p-aminobenzoic acid (12) gave the new carboxamides (13a-h) in excellent yields...
May 14, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29775952/molecular-simulation-and-experimental-validation-of-resorcinol-adsorption-on-ordered-mesoporous-carbon-omc
#3
Zaki Uddin Ahmad, Bing Chao, Mas Iwan Konggidinata, Qiyu Lian, Mark E Zappi, Daniel Dianchen Gang
Numerous research works have been devoted in the adsorption area using experimental approaches. All these approaches are based on trial and error process and extremely time consuming. Molecular simulation technique is a new tool that can be used to design and predict the performance of an adsorbent. This research proposed a simulation technique that can greatly reduce the time in designing the adsorbent. In this study, a new Rhombic ordered mesoporous carbon (OMC) model is proposed and constructed with various pore sizes and oxygen contents using Materials Visualizer Module to optimize the structure of OMC for resorcinol adsorption...
April 27, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29773188/the-toxic-effect-of-gallic-acid-on-biochemical-factors-viability-and-proliferation-of-rat-bone-marrow-mesenchymal-stem-cells-was-compensated-by-boric-acid
#4
Mohammad Hussein Abnosi, Somayeh Yari
OBJECTIVE: Gallic acid (GA) and boron are found in many plants. Our previous studies showed 6 ng/ml boric acid (BA) had positive effect on biochemistry of rat bone marrow mesenchymal stem cells (MSCs) and their osteogenic differentiation. Therefore, we investigate the effect of different doses of GA alone and in the presence of BA on MSCs. MATERIALS AND METHODS: the viability of MSCs was assayed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and trypan blue at 12, 24 and 36 h in presence of different concentration of GA...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29750226/b-2-o-3-sio-2-substitution-effect-on-structure-and-properties-of-na-2-o-cao-sro-p-2-o-5-sio-2-bioactive-glasses-from-molecular-dynamics-simulations
#5
Mengguo Ren, Xiaonan Lu, Lu Deng, Po-Hsuen Kuo, Jincheng Du
The effect of B2O3/SiO2 substitution in SrO-containing 55S4.3 bioactive glasses on glass structure and properties, such as ionic diffusion and glass transition temperature, was investigated by combining experiments and molecular dynamics simulations with newly developed potentials. Both short-range (such as bond length and bond angle) and medium-range (such as polyhedral connection and ring size distribution) structures were determined as a function of glass composition. The simulation results were used to explain the experimental results for glass properties such as glass transition temperature and bioactivity...
May 11, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29729695/hematoprotective-effect-of-boron-on-cyclophosphamide-toxicity-in-rats
#6
Mustafa Cengiz
The goal of this study was to determine the effects of  boric acid (B) as a boron source on blood cells and indirectly on bone marrow. Intraperitoneally (i.p.) administration of 200 mg / kg of cyclophosphamide (CP) resulted in reductions in the number of erythrocyte (20%), hemoglobin (20%), leukocytes (96%), thrombocytes (41%), and hematocrit (21%). The group given CP alone was killed 3 days after the CP administrated. For the group having CP+B (200 mg/kg i.p) treatment was started 3 days earlier than the CP administration and continued to the finish of the experiment (6 days)...
April 30, 2018: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/29720274/aerobic-bacteria-associated-with-chronic-suppurative-otitis-media-in-angola
#7
Fabian Uddén, Matuba Filipe, Åke Reimer, Maria Paul, Erika Matuschek, John Thegerström, Sven Hammerschmidt, Tuula Pelkonen, Kristian Riesbeck
BACKGROUND: Chronic suppurative otitis media (CSOM) is an important cause of hearing loss in children and constitutes a serious health problem globally with a strong association to resource-limited living conditions. Topical antibiotics combined with aural toilet is the first-hand treatment for CSOM but antimicrobial resistance and limited availability to antibiotics are obstacles in some areas. The goal of this study was to define aerobic pathogens associated with CSOM in Angola with the overall aim to provide a background for local treatment recommendations...
May 3, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29700610/methylboronic-acid-fertilization-alleviates-boron-deficiency-symptoms-in-arabidopsis-thaliana
#8
Catherine Duran, Patricio Arce-Johnson, Felipe Aquea
Our results showed that methylboronic acid is capable of alleviating boron deficiency, enhancing plant growth, and is less toxic than boric acid at higher concentrations. Boron is an essential plant micronutrient and its deficiency occurs in several regions globally, resulting in impaired plant growth. Boron fertilization is a common agricultural practice, but the action range of boron is narrow, sharply transitioning from deficiency to toxicity. Boric acid (BA) is the most common chemical form used in agriculture...
April 26, 2018: Planta
https://www.readbyqxmd.com/read/29679978/communication-photoionization-of-degenerate-orbitals-for-randomly-oriented-molecules-the-effect-of-time-reversal-symmetry-on-recoil-ion-momentum-angular-distributions
#9
Yoshi-Ichi Suzuki
The photoelectron asymmetry parameter β, which characterizes the direction of electrons ejected from a randomly oriented molecular ensemble by linearly polarized light, is investigated for degenerate orbitals. We show that β is totally symmetric under the symmetry operation of the point group of a molecule, and it has mixed properties under time reversal. Therefore, all degenerate molecular orbitals, except for the case of degeneracy due to time reversal, have the same β (Wigner-Eckart theorem). The exceptions are e-type complex orbitals of the Cn , Sn , Cnh , T, and Th point groups, and calculations on boric acid (C3h symmetry) are performed as an example...
April 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29675153/mechanistic-insights-into-boron-catalysed-direct-amidation-reactions
#10
Sergey Arkhipenko, Marco T Sabatini, Andrei S Batsanov, Valerija Karaluka, Tom D Sheppard, Henry S Rzepa, Andrew Whiting
The generally accepted monoacyloxyboron mechanism of boron-catalysed direct amidation is brought into question in this study, and new alternatives are proposed. We have carried out a detailed investigation of boron-catalysed amidation reactions, through study of the interaction between amines/carboxylic acids and borinic acids, boronic acids and boric acid, and have isolated and characterised by NMR/X-ray crystallography many of the likely intermediates present in catalytic amidation reactions. Rapid reaction between amines and boron compounds was observed in all cases, and it is proposed that such boron-nitrogen interactions are highly likely to take place in catalytic amidation reactions...
January 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/29620023/synthesis-structure-characterization-photoluminescence-properties-and-td-dft-calculations-for-two-new-borates
#11
Nasreddine Hadjadj, Mohamed AbdEsselem Dems, Hocine Merazig, Lamia Bendjeddou
Due to their rich structural chemistry and wide variety of applications, borate materials have provided a rich area of research. In a continuation of this research, diethylammonium bis(2-oxidobenzoato-κ2 O1 ,O2 )borate, C4 H12 N+ ·BO4 (C7 H4 O)2 - , (1), and propylammonium bis(2-oxidobenzoato-κ2 O1 ,O2 )borate, C3 H10 N+ ·BO4 (C7 H4 O)2 - , (2), have been synthesized by the reaction of boric acid with salicylic acid under ambient conditions. In both structures, the B atom exhibits a slightly distorted tetrahedral environment formed by the bidentate coordination of two salicylate anions via the O atoms of the central carboxylate and oxide groups...
April 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/29614662/some-methodological-characteristics-of-alzheimer-associated-urine-neuronal-thread-protein-detected-by-enzyme-linked-immunosorbent-assay
#12
He Jin, Rong Wang, Zhaohui Liu, Qiang Jia, Yanchuan Wu, Zhiwei Zhao, Yulan Wang, Xu Zhang
BACKGROUND: Alzheimer-associated neuronal thread protein (AD7c-NTP) has been found to be a candidate biomarker of Alzheimer's disease (AD). OBJECTIVE: To investigate the effects of urine collected time, different preservatives addition, and storage condition on the measurement of urine AD7c-NTP by enzyme-linked immunosorbent assay (ELISA). METHODS: Three hundred urine samples were collected from 20 participants at three time points on five consecutive days...
March 28, 2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29595968/c-glycosidation-of-unprotected-di-and-trisaccharide-aldopyranoses-with-ketones-using-pyrrolidine-boric-acid-catalysis
#13
Sherida Johnson, Avik Kumar Bagdi, Fujie Tanaka
C-Glycoside derivatives are found in pharmaceuticals, glycoconjugates, probes, and other functional molecules. Thus, C-glycosidation of unprotected carbohydrates is of interest. Here the development of C-glycosidation reactions of unprotected di- and trisaccharide aldopyranoses with various ketones is reported. The reactions were performed using catalyst systems composed of pyrrolidine and boric acid under mild conditions. Carbohydrates used for the C-glycosidation included lactose, maltose, cellobiose, 3'-sialyllactose, 6'-sialyllactose, and maltotriose...
March 29, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29591889/impact-of-chromium-and-boron-compounds-on-the-reproductive-function-in-rats
#14
Iztleuov Marat, Mamyrbayev Arstan, Yeleuov Galymzhan, Jarkenov Timur, Iztleuov Yerbolat, Yeleuov Almasbek
The purpose of this research is to study the process of mutagenesis and the reproductive function in male rats under separate and combined exposure to chromium and boron compounds. The experiment was conducted on two groups of animals. The first group was used to assess the ability of potassium dichromate and boric acid to induce mutation in germ and somatic cells under isolated and combined administration with the use of the dominant lethal mutations test and the micronuclei test in the polychromatophilic erythrocytes of the bone marrow...
January 1, 2018: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29587160/extending-neutron-autoradiography-technique-for-boron-concentration-measurements-in-hard-tissues
#15
Lucas Provenzano, María Silvina Olivera, Gisela Saint Martin, Luis Miguel Rodríguez, Daniel Fregenal, Silvia I Thorp, Emiliano C C Pozzi, Paula Curotto, Ian Postuma, Saverio Altieri, Sara J González, Silva Bortolussi, Agustina Portu
The neutron autoradiography technique using polycarbonate nuclear track detectors (NTD) has been extended to quantify the boron concentration in hard tissues, an application of special interest in Boron Neutron Capture Therapy (BNCT). Chemical and mechanical processing methods to prepare thin tissue sections as required by this technique have been explored. Four different decalcification methods governed by slow and fast kinetics were tested in boron-loaded bones. Due to the significant loss of the boron content, this technique was discarded...
March 14, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29568189/isolation-of-5-7-dihydroxy-6-8-dimethyl-flavanone-from-syzygium-aqueum-with-its-antioxidant-and-xanthine-oxidase-inhibitor-activities
#16
Muhamad Insanu, Zelika Mega Ramadhania, Evelyne Nadia Halim, Rika Hartati, Komar Ruslan Wirasutisna
Background: Syzygium aqueum Burm.f. Alston (water apple) belonging to Myrtaceae family was originated from tropical areas. It was traditionally used as a medicinal plant. Objective: The objective of the study was to isolate the active compound from the methanolic extract of S. aqueum leaves. Methods: Extraction was done using continuous extraction with methanol as a solvent. The extract was then fractionated using liquid-liquid extraction, vacuum liquid chromatography, and radial chromatography...
January 2018: Pharmacognosy Research
https://www.readbyqxmd.com/read/29557465/babof-3-a-new-aurivillius-like-borate-containing-two-types-of-f-atoms
#17
Dequan Jiang, Ying Wang, Hao Li, Zhihua Yang, Shilie Pan
Herein, a new fluorine-containing borate, BaBOF3, has been synthesized by a boric acid flux method. It possesses two types of F atoms, which are involved in the pseudo-Aurivillius type [Ba2F2]2+ layers and the unique infinite [BOF2]- chains. The first-principles calculations on the title compound were performed to elucidate the structure-property relationship.
April 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29557462/the-oxidation-of-borohydrides-by-photoexcited-uo-2-co-3-3-4
#18
Koichiro Takao, Satoru Tsushima
The carbonate ion is an effective quencher of uranyl(vi) luminescence and makes uranyl(vi) tricarbonate barely luminescent and photochemically inactive. We demonstrate here that photoexcited uranyl(vi) tricarbonate, *[UVIO2(CO3)3]4-, can however oxidize borohydrides (BH3X-, X = H, CN) to give boric acid and H2 gas, reducing itself to [UVO2(CO3)3]5-. This hypothesis was supported by UV-vis and NMR spectroscopy as well as quantum chemical calculations. The charge transfer states associated with photoreduction processes were modelled by density functional theory calculations...
April 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29550556/boron-evaporation-in-thermally-driven-seawater-desalination-effect-of-temperature-and-operating-conditions
#19
A Alpatova, A Alsaadi, N Ghaffour
The volatilization of boron in thermal desalination processes, namely multi-stage flash (MSF) and air-gap membrane distillation (AGMD) was investigated for the first time. This phenomenon was observed at feed temperatures above 55 °C in both studied processes. In simulated MSF process with two feeds, model boric acid and Red Sea water, boron concentration in distillate increased with feed temperature increase from 55 °C to 104 °C because of the increase in boric acid vapor pressure. Salinity and pH were the main factors controlling boron evaporation...
June 5, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29536335/boron-affects-the-development-of-the-kidney-through-modulation-of-apoptosis-antioxidant-capacity-and-nrf2-pathway-in-the-african-ostrich-chicks
#20
Haseeb Khaliq, Wang Jing, Xiao Ke, Yang Ke-Li, Sun Peng-Peng, Lei Cui, Qiu Wei-Wei, Lei Zhixin, Liu Hua-Zhen, Song Hui, Zhong Ju-Ming, Peng Ke-Mei
The nuclear-related factor 2 (Nrf2) pathway is the most important mechanism in antioxidant capacity, which regulates the cell's redox homeostasis. In addition, Nrf2 pathway also can inhibit cell apoptosis. The mechanism of boron actions on various organs is well documented. But, it is not known whether boron can also regulate the Nrf2 pathway in the kidneys. Therefore, in this research, the actions of boron on the kidneys of ostrich chicks, especially the antioxidant effects, have been studied. The ostrich chicks were divided into six groups and supplemented with boric acid (BA) (source of boron) in the drinking water (0, 40, 80, 160, 320, 640 mg respectively) to examine apoptotic, antioxidant, biochemical, and histochemical alterations induced by boron administration in the ostrich chick's kidney...
March 13, 2018: Biological Trace Element Research
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