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Boric acid

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
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
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
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
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
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
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 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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
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
Pasquale Sacco, Franco Furlani, Michela Cok, Andrea Travan, Massimiliano Borgogna, Eleonora Marsich, Sergio Paoletti, Ivan Donati
The present paper explores the effect of boric acid on Chitlac, a lactose-modified chitosan which had previously shown interesting biological and physical-chemical features. The herewith-reported experimental evidences demonstrated that boric acid binds to Chitlac, producing conformational and association effects on the chitosan derivative. The thermodynamics of boric acid binding to Chitlac was explored by means of (11)B NMR, circular dichroism (CD), and UV-vis spectroscopy, while macromolecular effects were investigated by means of viscometry and dynamic light scattering (DLS)...
November 8, 2017: Biomacromolecules
Keiko Sasaki, Kenta Toshiyuki, Binglin Guo, Keiko Ideta, Yoshikazu Hayashi, Tsuyoshi Hirajima, Jin Miyawaki
Discharge from accidental nuclear power plants includes boric acid, which is used as a neutron absorbent in nuclear reactors. Co-precipitation of borate with hydroxyapatite (HAp), using Ca(OH)2, is known to be an effectively fast method for stabilization of borate as well as coexisting radioactive nuclides. To reduce bulky volume of solid residues after co-precipitation, calcination is necessary to investigate the chemical stability of targets. Calcination at 850°C resulted in the high crystalization of HAp with formation of xCaO·B2O3 as a by-phase in which x increased with a decrease in the borate contents...
October 8, 2017: Journal of Hazardous Materials
Hen Moshe, Yuval Davizon, Maya Menaker Raskin, Alejandro Sosnik
In this work, we report a new type of poly(vinyl alcohol)-g-poly(N-isopropylacrylamide) (PVA-g-PNiPAAm) amphiphilic nanogel produced by the non-covalent crosslinking of PVA polyol domains in preformed polymeric micelles with boric acid. The nanomaterials showed sizes in the 100-250 nm range (DLS) and a spherical morphology (HR-SEM). We demonstrated that the size of the polymeric micelles could be fine-tuned by changing the concentration (and the aggregation pattern) of the polymeric amphiphile in water. Upon crosslinking, the polymeric micelles turned into physically stable amphiphilic nanogels that displayed both size and size distribution similar to the micellar precursor for up to two weeks, even under disfavored conditions of concentration and temperature that, in the case of non-crosslinked counterparts, resulted in quick disassembly...
October 24, 2017: Biomaterials Science
Selcen Cakir, Meryem Eren, Meryem Senturk, Zeynep Soyer Sarica
In this study, we evaluated the effect of boron (B) as boric acid (BA) on body weight (b.w.); blood glucose; plasma insulin; lipase and paraoxonase (PON1) activities; and serum triglyceride, total cholesterol, high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol, lipid peroxidation (MDA), and total antioxidant capacity (TAC) in streptozotocin (STZ)-induced experimental diabetes in rats. Sixty Wistar albino rats (200-250 g) were divided into six groups of ten. The groups received the following treatment: group 1, control group; group 2, 50 mg/kg (b...
October 10, 2017: Biological Trace Element Research
Bryan Larsen, Marija Petrovic, Francesco De Seta
Clinical use of boric acid as a topical antifungal in women who have failed standard antifungal therapy with azole drugs has been used sporadically for decades. Our previous in vitro work showing inhibition of Candida albicans growth was conducted on clinical isolates without antifungal drug susceptibility profiling. Here, we report that boric acid restricts growth of drug-resistant Candida albicans and inhibits hyphal growth and diminishes cell volume. The availability of over-the-counter organoboron compounds intended for use as oral nutritional supplements led us to determine if these also were inhibitory toward resistant Candida and show here that they also possess antifungal activity...
October 9, 2017: Mycopathologia
Khan M A Uddin, Mariko Ago, Orlando J Rojas
Chitosan (CS), cellulose nanofibrils (CNF) and boric acid, the latter of which was used as flame retardant, were combined in transparent, hybrid films that were produced by solvent casting. The flammability and the thermal stability of the films were studied with respect to the loading of the inorganic component. Chitosan films displayed fire retardancy properties, which were enhanced in the presence of boric acid. CNF films, in contrast to those from chitosan, were readily flammable; however, when combined with boric acid (30w%), they became self-extinguishing...
December 1, 2017: Carbohydrate Polymers
K Ganesh, R Soumen, Y Ravichandran, Janarthanan
Recently, dynamic approach has been applied to determine the steady state concentrations of multiple ionic species present in complex buffers at equilibrium. Here, we have used the dynamic approach to explicitly model the pH profiles of biologically relevant phosphate buffer and universal buffer (a mixture of three tri-protic acids such as citric acid, boric acid and phosphoric acid). The results from dynamic approach are identical to that of the conventional algebraic approach, but with an added advantage that the dynamic approach, allow for the modelling of complex buffer systems relatively easy compared to that of algebraic method...
March 2017: Biochemistry and Biophysics Reports
Mariana Nadjara Klein, Katia Cristina Kupper
The biocontrol efficiency of Aureobasidium pullulans strain ACBL-77 against Geotrichum citri-aurantii, causal agent of sour rot in citrus, and their interactions were evaluated. For this, were evaluated the incorporation of nutrients in optimizing the antagonistic activity of the yeast, the competition for nutrients between microorganisms, the effect of nutrients on yeast cell and biofilm production and their correlation in the biocontrol of disease, the survival of yeast in citrus fruits and the interaction between microorganisms using scanning electron microscopy...
February 2018: Food Microbiology
Bingbing Huo, Bingping Liu, Tao Chen, Liang Cui, Gengfang Xu, Mengli Liu, Jingquan Liu
A facile and effective approach for the preparation of functionalized born nitride quantum dots (BNQDs) with blue fluorescence was explored by the hydrothermal treatment of the mixture of boric acid and melamine at 200 °C for 15 h. The as-prepared BNQDs were characterized by transmission electron microscopy (TEM), high-resolution TEM, atomic force microscopy, X-ray photoelectron spectroscopy, UV-vis spectroscopy, and fluorescence spectroscopy. The single layered BNQDs with the average size of 3 nm showed a blue light emission under the illumination of the UV light...
September 29, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
David Izuchukwu Ugwu, Uchechukwu Chris Okoro, Hilal Ahmad
Sixteen new carboxamide derivatives bearing substituted benzenesulphonamide moiety (7a-p) were synthesized by boric acid mediated amidation of appropriate benzenesulphonamide with 2-amino-4-picoline and tested for anti-inflammatory activity. One compound 7c showed more potent anti-inflammatory activity than celecoxib at 3 h in carrageenan-induced rat paw edema bioassay. Compounds 7g and 7k also showed good anti-inflammatory activity comparable to celecoxib. Compound 7c appeared selectivity index (COX-2/COX-1) better than celecoxib...
2017: PloS One
Anne Schneider, Joseph Hemmerlé, Manon Allais, Jeoffrey Didierjean, Marc Michel, Marco d'Ischia, Vincent Ball
The deposition of polydopamine (PDA) films on surfaces, a versatile deposition method with respect to the nature of the used substrate, is unfortunately accompanied by deposition of insoluble precipitates in solution after a prolonged oxidation time of dopamine solutions. Therefore, there is evident interest to find methods able to stop the deposition of PDA on surfaces and to simultaneously control the self-assembly of PDA in solution to get stable colloidal aggregates. In addition to proposed methods relying on the use of polymers like poly(vinyl alcohol) and proteins like human serum albumin, we show herein that boric acid is an efficient adjuvant that is simultaneously able to stop the self-assembly of PDA in solution as well as on surfaces and to change the adhesive properties of the resulting PDA coatings...
September 15, 2017: ACS Applied Materials & Interfaces
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