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Boric acid

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https://www.readbyqxmd.com/read/28208304/boric-acid-functional-lanthanide-metal-organic-frameworks-for-selective-ratiometric-fluorescence-detection-of-fluoride-ions
#1
Zhong-Rui Yang, Man-Man Wang, Xue-Sheng Wang, Xue-Bo Yin
Here, we report that boric acid is used to tune the optical properties of lanthanide metal-organic frameworks (LMOFs) for dual-fluorescence emission and improves the selectivity of LMOFs for the determination of F(-) ions. The LMOFs are prepared with 5-boronoisophthalic acid (5-bop) and Eu(3+) ions as the precursors. Emission mechanism study indicates that 5-bop is excited with UV photons to produce its triplet state, which then excites Eu(3+) ions for their red emission. This is the general story of the antenna effect, but electron-deficient boric acid decreases the energy transfer efficiency from the triplet state of 5-bop to Eu(3+) ions, so dual emission from both 5-bop and Eu(3+) ions is efficiently excited at the single excitation of 275 nm...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28206859/evaluation-and-adaptation-of-attractive-toxic-sugar-baits-for-culex-tarsalis-and-culex-quinquefasciatus-control-in-the-coachella-valley-southern-california
#2
Whitney A Qualls, Jodi Scott-Fiorenzano, Gunter C Müller, Kristopher L Arheart, John C Beier, Rui-De Xue
The project goal was to determine how a new vector control strategy that targets the sugar-feeding behavior of mosquitoes, attractive toxic sugar baits (ATSBs), can be used to more effectively control West Nile virus (WNV) vectors in the Coachella Valley, California. Three laboratory studies were conducted to determine the utility of this method for control against Culex quinquefasciatus and Culex tarsalis : 1) efficacy evaluations of 2 formulations of ATSB, microencapsulated garlic oil, and a combination of microencapsulated garlic oil and 1% boric acid; 2) choice assays to determine the attractiveness of ATSB with the microencapsulated garlic oil against attractive sugar baits (ASB; the attractant alone; without toxin) and a 10% sucrose solution; and 3) vegetation efficacy tests on 3 common plant species in the Coachella Valley, Atriplex lentiformis, Tamarix ramosissima , and Pluchea sericea...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28195399/capillary-electrophoresis-fingerprints-combined-with-chemometric-methods-to-evaluate-the-quality-consistency-and-predict-the-antioxidant-activity-of-yinqiaojiedu-tablet
#3
Didi Ma, Lanping Yang, Bo Yan, Guoxiang Sun
The quality consistency of Yinqiaojiedu tablets was monitored by extracting their electrophoretic fingerprint and marker compound data which were obtained using capillary electrophoresis. To select the suitable background electrolyte, wing-shape method was proposed. A background electrolyte composed of 103.1 mM boric acid, 51.6 mM sodium borate, 9.8 mM disodium hydrogen phosphate, and 15.6 mM sodium dihydrogen phosphate was used to separate compounds. Under the optimized background electrolyte, the content of three marker compounds was determined in 25 Yinqiaojiedu tablet samples...
February 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28167234/epiberberine-a-natural-protoberberine-alkaloid-inhibits-urease-of-helicobacter-pylori-and-jack-bean-susceptibility-and-mechanism
#4
Lihua Tan, Cailan Li, Hanbin Chen, Zhizhun Mo, Jiangtao Zhou, Yuhong Liu, Zhilin Ma, Yuyao Xu, Xiaobo Yang, Jianhui Xie, Ziren Su
In our previous study, Rhizoma Coptidis extract was found to exert more potent inhibitory effect than its major component berberine towards urease from Helicobacter pylori (HPU) and jack bean (JBU). In continuation of our work, the present study was designed to further comparatively investigate the urease inhibitory activities of five major protoberberine alkaloids in Rhizoma Coptidis, namely berberine, palmatine, coptisine, epiberberine, jateorhizine to identify the bioactive constituent, and illuminate the potential mechanism of action...
February 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28163341/complexation-of-nickel-ions-by-boric-acid-or-poly-borates
#5
REVIEW
Anais Graff, Etienne Barrez, Philippe Baranek, Martin Bachet, Pascale Bénézeth
An experiment based on electrochemical reactions and pH monitoring was performed in which nickel ions were gradually formed by oxidation of a nickel metal electrode in a solution of boric acid. Based on the experimental results and aqueous speciation modeling, the evolution of pH showed the existence of significant nickel-boron complexation. A triborate nickel complex was postulated at high boric acid concentrations when polyborates are present, and the equilibrium constants were determined at 25, 50 and 70 °C...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28158885/breaking-bad-delirium-methamphetamine-and-boric-acid-toxicity-with-hallucinations-and-pseudosepsis
#6
Kayla Johnson, Joanna L Stollings, E Wesley Ely
OBJECTIVES: A 30-year-old patient presented with hallucinations and profound shock. He was initially misdiagnosed as having severe sepsis; once ingestions were considered, he was diagnosed as potentially having arsenic toxicity. SUMMARY: The clinical story reveals many instructional lessons that could aid in the evaluation and management of future patients. This man presented with large amounts of blue crystals around his nose and lips from inhaling and eating boric acid (an ant poison) so he could, as he put it, kill the ants "pouring into my mouth and nose and up into my brain...
February 2017: Southern Medical Journal
https://www.readbyqxmd.com/read/28126655/direct-solid-surface-fluorescence-spectroscopy-of-standard-chemicals-and-humic-acid-in-ternary-system
#7
S Mounier, G Nicolodelli, R Redon, D M B P Milori
The front face fluorescence spectroscopy is often used to quantify chemicals in well-known matrices as it is a rapid and powerful technique, with no sample preparation. However it was not used to investigate extracted organic matter like humic substances. This work aims to fully investigate for the first time front face fluorescence spectroscopy response of a ternary system including boric acid, tryptophan and humic substances, and two binaries system containing quinine sulfate or humic substance in boric acid...
January 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28124897/facile-modification-of-reverse-osmosis-membranes-by-surfactant-assisted-acrylate-grafting-for-enhanced-selectivity
#8
Katie Baransi Karkaby, Maria Bass, Stanislav Levchenko, Shahar Eitan, Viatcheslav Freger
The top polyamide layer of composite reverse osmosis (RO) membranes has a fascinatingly complex structure, yet nanoscale non-uniformities inherently present in polyamide layer may reduce selectivity, e.g., for boron rejection. This study examines improving selectivity by in situ "caulking" such non-uniformities using concentration polarization-enhanced graft-polymerization with a surfactant added to the reactive solution. The surfactant appears to enhance both polarization (via monomer solubilisation in surfactant micelles) and adherence of graft-polymer to the membrane surface, which facilitates grafting and reduces monomer consumption...
January 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28087364/aquaglyceroporins-are-the-entry-pathway-of-boric-acid-in-trypanosoma-brucei
#9
Sabrina Marsiccobetre, Alexis Rodríguez-Acosta, Florian Lang, Katherine Figarella, Néstor L Uzcátegui
The boron element possesses a range of different effects on living beings. It is essential to beneficial at low concentrations, but toxic at excessive concentrations. Recently, some boron-based compounds have been identified as promising molecules against Trypanosoma brucei, the causative agent of sleeping sickness. However, until now, the boron metabolism and its access route into the parasite remained elusive. The present study addressed the permeability of T. brucei aquaglyceroporins (TbAQPs) for boric acid, the main natural boron species...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28077431/enantiomers-recognition-of-propranolol-based-on-organic-inorganic-hybrid-open-tubular-mips-cec-column-using-3-trimethoxysilyl-propyl-methacrylate-as-a-cross-linking-monomer
#10
Guo-Ning Chen, Ning Li, Tian Luo, Yu-Ming Dong
In this study, 3-(trimethoxysilyl)propyl methacrylate (γ-MPS), a bifunctional group compound, was used as a single cross-linking agent to prepare molecular imprinted inorganic-organic hybrid polymers by in situ polymerization for open-tubular capillary electro chromatography (CEC) column. The optimal preparation conditions were: the ratio between template molecule and functional monomer was 1:4; the volume proportion of porogen toluene and methanol was 1:1 and the volume of cross-linking agent γ-MPS was 69 μL...
January 10, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28054509/single-step-synthesis-of-crystalline-h-bn-quantum-and-nanodots-embedded-in-boron-carbon-nitride-films
#11
Boitumelo J Matsoso, Kamalakannan Ranganathan, Bridget K Mutuma, Tsenolo Lerotholi, Glenn Jones, Neil J Coville
Herein we report on the synthesis and characterization of novel crystalline hexagonal boron nitride (h-BN) quantum- and nanodots embedded in large-area boron carbon nitride (BCN) films. The films were grown on a Cu substrate by an atmospheric pressure chemical vapour deposition technique. Methane, ammonia, and boric acid were used as precursors for C, N and B to grow these few atomic layer thick uniform films. We observed that both the size of the h-BN quantum/nanodots and thickness of the BCN films were influenced by the vaporization temperature of boric acid as well as the H3BO3 (g) flux over the Cu substrate...
March 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28042842/novel-2-3-dihydro-1h-pyrrolo-3-2-1-ij-quinazolin-1-ones-synthesis-and-biological-evaluation
#12
Malose J Mphahlele, Tebogo A Khoza, Peaceful Mabeta
Herein we describe the synthesis and evaluation of a series of novel 2,3-dihydro-1H-pyrrolo[3,2,1-ij]quinazolin-1-ones for in vitro cytotoxicity against three human cancer cell lines as well as for potential antimalarial activity against the chloroquine-sensitive strain 3D7 of Plasmodium falciparum. The title compounds were prepared via PdCl₂-mediated endo-dig cyclization of 2-aryl-8-(arylethynyl)-6-bromo-2,3-dihydroquinazolin-4(1H)-ones. The latter were prepared, in turn, via initial Sonogashira cross-coupling of 2-amino-5-bromo-3-iodobenzamide with aryl acetylenes followed by boric acid-mediated cyclocondensation of the intermediate 2-amino-3-(arylethynyl)-5-bromobenzamides with benzaldehyde derivatives...
December 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28040665/spectroscopic-quantification-of-5-hydroxymethylcytosine-in-genomic-dna-using-boric-acid-functionalized-nano-microsphere-fluorescent-probes
#13
Hua-Yan Chen, Jing-Ru Wei, Jiong-Xiu Pan, Wei Zhang, Fu-Quan Dang, Zhi-Qi Zhang, Jing Zhang
5-hydroxymethylcytosine (5hmC) is the sixth base of DNA. It is involved in active DNA demethylation and can be a marker of diseases such as cancer. In this study, we developed a simple and sensitive 2-(4-boronophenyl)quinoline-4-carboxylic acid modified poly (glycidyl methacrylate (PBAQA-PGMA) fluorescent probe to detect the 5hmC content of genomic DNA based on T4 β-glucosyltransferase-catalyzed glucosylation of 5hmC. The fluorescence-enhanced intensity recorded from the DNA sample was proportional to its 5-hydroxymethylcytosine content and could be quantified by fluorescence spectrophotometry...
December 16, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28031470/effectiveness-of-naturally-occurring-substances-added-to-duck-litter-in-reducing-emergence-and-landing-of-adult-musca-domestica-diptera-muscidae
#14
Simon Lachance, Justine Shiell, Michele T Guerin, Cynthia Scott-Dupree
Poultry barns provide an ideal breeding environment for Musca domestica L. (Diptera: Muscidae) owing to the controlled temperatures and litter (manure plus bedding material) accumulation. Management techniques that render the litter less suitable for immature stage development, such as the addition of naturally occurring insecticidal substances, could reduce fly infestations. The effectiveness of acetic, boric, and citric acids; diatomaceous earth; and hydrated lime at restricting female landing and growth of house flies in duck litter was evaluated...
December 28, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28024393/boron-precursor-dependent-evolution-of-differently-emitting-carbon-dots
#15
Jayasmita Jana, Mainak Ganguly, Kuttay R S Chandrakumar, Gowravaram Mohan Rao, Tarasankar Pal
Attention has been directed toward electron-deficient boron doping in carbon dots (CDs) with the expectation of revealing new photophysical aspects in accordance with varying amounts of boron content. It has been emphatically shown that boron uptake in CDs varies with different boron precursors evolving altered emissive CDs. Boron doping in CDs causes definite surface defect due to the generation of electron-deficient states. Modified hydrothermal treatment of a mixture of ascorbic acid (AA) and different boron precursor compounds (borax/boric acid/sodium borate/sodium borohydride) produces different kinds of boron-doped CDs (BCDs)...
January 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28004084/a-novel-synthesis-of-zinc-borates-from-a-zinc-oxide-precursor-via-ultrasonic-irradiation
#16
Ali Can Ersan, Meral Yildirim, Azmi Seyhun Kipcak, Nurcan Tugrul
In this study, zinc borate hydrate (Zn3B6O12 · 3.5H2O) was synthesized from zinc oxide (ZnO) and boric acid (H3BO3) via a novel method of ultrasonic irradiation. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and Raman spectroscopy were used to characterize the synthesized products. Scanning electron microscopy (SEM) was used to determine the effects of reaction time and reaction temperature on the morphology of the products. Thermal dehydration kinetics were studied using thermal gravimetry and differential thermal gravimetry analysis (TG/DTA)...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/27987998/preparation-and-characterization-of-intelligent-starch-pva-films-for-simultaneous-colorimetric-indication-and-antimicrobial-activity-for-food-packaging-applications
#17
Bin Liu, Han Xu, Huiying Zhao, Wei Liu, Liyun Zhao, Yuan Li
We have developed an intelligent starch/poly-vinyl alcohol (PVA) film that is capable of monitoring pH changes and inhibiting undesired microbial growth in foods. Starch and PVA polymers in the film were doubly cross-linked by sodium trimetaphosphate and boric acid to improve their water-resistance and mechanical strength. Anthocyanins (ANT) and limonene (LIM) were used to achieve simultaneous colorimetric indication and antimicrobial activity. Firstly, the characterization of surface morphology using SEM confirmed that the starch-PVA-ANT-LIM film possessed a smooth surface...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987659/optimization-of-crosslinked-poly-vinyl-alcohol-nanocomposite-films-for-mechanical-properties
#18
Milad Rouhi, Seyed Hadi Razavi, Seyed Mohammad Mousavi
The effects of glycerol, bacterial cellulose nanocrystal (BCNC) and boric acid concentrations on the mechanical properties of PVA based films, including ultimate tensile strength (UTS), elongation at break (EAB), tensile Young's modulus (TYM), tensile toughness to break (TT), ultimate puncture strength (UPS), puncture deformation (PD), puncture Young's modulus (PYM) and puncture toughness to break (PT), were scrutinized using a response surface methodology-central composite rotatable design (RSM-CCRD). Second-order polynomial models with high R(2) values ranging from 0...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27984554/trichomonas-vaginalis-treated-with-boric-acid-in-a-metronidazole-allergic-female
#19
Kandis Vechelle Backus, Christina A Muzny, Laura S Beauchamps
No abstract text is available yet for this article.
December 14, 2016: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27974728/enhancing-physical-properties-and-lifespan-of-bacterial-quorum-quenching-media-through-combination-of-ionic-cross-linking-and-dehydration
#20
Sang Hyun Lee, Seonki Lee, Kibaek Lee, Chang Hyun Nahm, Sung-Jun Jo, Jaewoo Lee, Kwang-Ho Choo, Jung-Kee Lee, Chung-Hak Lee, Pyung-Kyu Park
Quorum quenching (QQ) bacteria entrapped in a polymeric composite hydrogel (QQ medium) has been successfully applied in MBRs for an effective biofouling control. However, in order to bring QQ technology closer to practice, physical strength and life time of QQ media should be improved. In this study, enforcement of physical strength, as well as an extension of the lifetime of a previously reported QQ bacteria entrapping hollow cylinder (QQ-HC), was sought by adding a dehydration procedure following the cross-linking of the polymeric hydrogel by inorganic compounds like Ca²⁺ and boric acid...
December 14, 2016: Journal of Microbiology and Biotechnology
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