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Sodium hydroxide

Fengsan Zhang, Yiding Shen, Ting Ren, Lei Wang, Ying Su
A new guar gum derivative was synthesized though the nucleophilic substitution of sodium hydroxide-activated guar gum with n-butyl glycidyl (BGE) ether. The physicochemical properties of 2-alkenyl-3-butoxypropyl guar gum (ABPG) were characterized by attenuated total reflection Fourier transform infrared spectrometry (ATR-FTIR), X-ray diffraction (XRD) and thermal gravimetric analyses (TGA). The results showed that sodium hydroxide can be effectively substituted with BGE to form the ABPG. The steady and dynamic rheological properties of the aqueous solution and ABPG gel were determined using an RS6000 rheometer...
January 16, 2017: International Journal of Biological Macromolecules
Joanna Witos, Giacomo Russo, Suvi-Katriina Ruokonen, Susanne K Wiedmer
Owing to their unique properties and unlimited structural combinations, the ubiquitous use of ionic liquids (ILs) is steadily increasing. The objective of the present work is to shed light onto the effects of amidinium- and phosphonium-based ILs on phospholipid vesicles using a nanoplasmonic sensing measurement technique. A new and relatively simple method was developed for the immobilization of large unilamellar vesicles on two different hydrophilic surfaces composed of titanium dioxide and silicon nitride nanolayers...
January 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Fumihiko Ogata, Erimi Ueta, Megumu Toda, Masashi Otani, Naohito Kawasaki
Different molar ratios of a Ni/Co binary hydroxide (NiCo82, NiCo91, and Ni100) were prepared and calcined at 270 °C (NiCo82-270, NiCo91-270, and Ni100-270). The properties of the adsorbents and the amount of adsorbed phosphate ions were evaluated. The adsorbents calcined at 270 °C had a nickel oxide structure. The amount of adsorbed phosphate ions, the amount of hydroxyl groups, and the specific surface area of the calcined adsorbents at 270 °C were greater than those of the uncalcined adsorbents. The amount of adsorbed phosphate ions was related to the amount of hydroxyl groups and the specific surface area; the correlation coefficients were 0...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Hanayo Kodama, Yoshinaga Tamura, Ichiro Kamei, Kyoko Sato, Hiroshi Akiyama
Microcrystalline cellulose (MCC) is used globally as an inactive ingredient in food and nutraceutical products and is commonly used as a food additive. To confirm the conformity of MCC to the solubility requirements stipulated in international specifications, the solubilities of commercially available MCC products were tested in sodium hydroxide (NaOH) solution. All of the samples were insoluble in NaOH solution, which is inconsistent with the descriptions provided in international specifications. We also prepared celluloses with different degree of polymerization (DP) values by acid hydrolysis...
2017: Biological & Pharmaceutical Bulletin
Juliet Victoria, Annamma Odaneth, Arvind Lali
Depolymerisation of lignocellulosic biomass is catalysed by groups of enzymes whose action is influenced by substrate features and the composition of cellulase preparation. Cellulases contain a mixture of variety of enzymes, whose proportions dictate the saccharification of biomass. In the current study, four cellulase preparations varying in their composition were used to hydrolyse two types of alkali treated biomass (aqueous ammonia treated rice straw and sodium hydroxide treated rice straw) to study the effect on catalytic rate, saccharification yields and sugar release profile...
January 3, 2017: Preparative Biochemistry & Biotechnology
Ensa Gitteh, Jacob Kweku Otu, Tijan Jobarteh, Francis Mendy, Isatou Tutty Faal-Jawara, Nana Boatema Ofori-Anyinam, Abigail Ayorinde, Ousman Secka, Florian Gehre
OBJECTIVE/BACKGROUND: To determine the culture yield and time to detection of mycobacterial growth between samples decontaminated using 0.7% chlorhexidine and sodium hydroxide-N-acetyl-l-cysteine (NaOH-NALC) and cultured on the Löwenstein-Jensen (LJ) medium. We also aimed to determine the contamination rate between the 0.7% chlorhexidine and NaOH-NALC decontamination methods. METHODS: The study was carried out on 68 sputa samples (42 smear positives and 26 smear negatives)...
December 2016: International Journal of Mycobacteriology
D D Yang, J N Xu, B L Zhu
Objective: To investigate and analyze the influential factors of occupational hazard acci-dents, emergency facilities and emergency management in Silicon solar cell producing enterprises, then to pro-vide scientific strategies. Methods: The methods of occupationally healthy field investigating, inspecting of ven-tilation effectiveness, setup of emergency program and wearing chemical suit were used. Results: The mainly occupational hazard accidents factors in the process of Silicon solar cell producing included poisoning chemi-cals, high temperature, onizing radiation and some workplaces...
November 20, 2016: Chinese Journal of Industrial Hygiene and Occupational Diseases
Wenwen Wang, Hao Zhang, Zhifeng Zhang, Mengying Luo, Yuedan Wang, Qiongzhen Liu, Yuanli Chen, Mufang Li, Dong Wang
In this study, poly(vinyl alcohol-co-ethylene) (PVA-co-PE) nanofibrous membrane was activated by sodium hydroxide and cyanuric chloride, and then the activated membranes were functionalized by 1,3-propanediamine, hexamethylenediamine and diethylenetriamine to be affinity membranes for bilirubin removal, respectively. The chemical structures and morphologies of membranes were investigated by SEM, FTIR and XPS. And the adsorption ability of different amine-functionalized nanofibrous membranes for bilirubin was characterized...
October 18, 2016: Colloids and Surfaces. B, Biointerfaces
Hua Lin Cai, Yang Deng, Ping Fei Fang, SiSi Cao, Zhen Yan Hou, Yan Qin Wu, Xue Jiao Chen, Miao Yan, BiKui Zhang
A robust and highly sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for the determination of pericyazine in human plasma. The plasma sample was alkalized with sodium hydroxide solution and handled by liquid-liquid extraction with ethyl acetate after adding perphenazine as an internal standard (IS). The analytes were separated on an Ultimate™ AQ-C18 analytical column at 40°C, with a gradient elution consisting of A (aqueous phase: 5mM ammonium acetate buffer solution containing 0...
December 15, 2016: Journal of Pharmaceutical and Biomedical Analysis
Hilary P Emerson, Silvina Di Pietro, Yelena Katsenovich, Jim Szecsody
Ammonia gas injection is a promising technique for the remediation of uranium within the vadose zone. It can be used to manipulate the pH of a system and cause co-precipitation processes that are expected to remove uranium from the aqueous phase and decrease leaching from the solid phase. The work presented in this paper explores the effects of ammonium and sodium hydroxide on the partitioning of uranium and dissolution of the kaolinite mineral in simplified synthetic groundwaters using equilibrium batch sorption and sequential extraction experiments...
February 2017: Journal of Environmental Radioactivity
B Maharjan, C D Kelly-Cirino, A Weirich, P S Curry, H Hoffman, K Avsar, B Shrestha
SETTING: German Nepal TB Project, National Tuberculosis Reference Laboratory, Kathmandu, Nepal. OBJECTIVE: To evaluate whether transporting samples in OMNIgene®•SPUTUM (OM-S) reagent from a peripheral collection site to a central laboratory in Nepal can improve tuberculosis (TB) detection and increase the sensitivity of Xpert® MTB/RIF testing. DESIGN: One hundred sputum samples were split manually. Each portion was assigned to the OM-S group (OM-S added at collection, airline-couriered without cold chain, no other processing required) or the standard-of-care (SOC) group (samples airline-couriered on ice, sodium hydroxide + N-acetyl-L-cysteine processing required at the laboratory)...
December 1, 2016: International Journal of Tuberculosis and Lung Disease
Ana L Costa, Ana C Gomes, Martyn Pillinger, Isabel S Gonçalves, João Pina, João Sérgio Seixas de Melo
Steady-state and time-resolved absorption and fluorescence measurements are reported for Congo Red (CR) in aqueous and DMSO solutions. The very low fluorescence quantum yield (~10-4) for CR in dilute solutions together with the absence of a triplet state indicates that internal conversion is the dominant deactivation route with more than 99.99% of the quanta loss (attributed to the energy gap law). Although no direct evidence for trans-cis photoisomerization was obtained from absorption or fluorescence data, the global analysis of fs-transient absorption data indicates the presence of a photoproduct with a lifetime of ~170 ps that is suggested to be associated with such a process...
December 19, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Deepa J Shetty, Pranav Kshirsagar, Sneha Tapadia-Maheshwari, Vikram Lanjekar, Sanjay K Singh, Prashant K Dhakephalkar
Anaerobic digestion is the most cost effective technology for sustainable biogas production from rice straw. Rice straw was subjected to ambient pretreatment with alkali and subsequently digested anaerobically. A dimensional equation was developed to predict the efficacy of alkali treatment in terms of soluble COD. Biomethanation process parameters like temperature, initial pH, particle size, substrate/inoculum ratio, trace element supplementation, C/N ratio and hydraulic retention time were optimized. The highest biogas production under optimized conditions was 514L/kg VS/day (∼59% CH4) from milled rice straw (1mm) pretreated with sodium hydroxide (1% w/v) at ambient temperature for 180min...
February 2017: Bioresource Technology
Zongwen Wu, Peiwen Zhou, Jingru Yang, Junli Li
Highly substituted carboxymethyl Cassia tora gum (CM-CTG) was prepared from CTG by treatment with monochloroacetic acid (MCA) in ethanolic aqueous solutions after alkalization under different reaction conditions. The influence of the etherification temperature, alkalization and etherification times, molar ratio of sodium hydroxide to MCA (nNaOH/nMCA), theoretical degree of substitution (DSt), and weight percentage of water (WH2O%) in the solution on the degree of substitution (DS) and reaction efficiency (RE) of the reaction were investigated...
February 10, 2017: Carbohydrate Polymers
Mostafa Hossein Beyki, Mosleh Mohammadirad, Farzaneh Shemirani, Ali Akbar Saboury
Polymeric ionomers with anion exchange capability are considered to be classes of environmentally friendly compounds as combination of them with anionic layered hydroxides constitute emerging advance materials. Biosorption by polymeric ionomer - layered double hydroxide (LDH) hybrid material exhibits an attractive green, low cost and low toxic - clean way. As a result, a novel anion exchange platform has been developed by the reaction of CaAl - LDH with Fe(2+), cellulose solution, epichlorohydrin and pyridine...
February 10, 2017: Carbohydrate Polymers
S Fidan, F Muhaffel, M Riool, G Cempura, L de Boer, S A J Zaat, A Czyrska- Filemonowicz, H Cimenoglu
The aim of this study was to cover the surfaces of zirconium (Zr) with an antimicrobial layer for biomedical applications. For this purpose, the micro-arc oxidation (MAO) process was employed in a sodium silicate and sodium hydroxide containing base electrolyte with and without addition of silver acetate (AgC2H3O2). In general, synthesized MAO layers were composed of zirconium oxide (ZrO2) and zircon (ZrSiO4). Addition of AgC2H3O2 into the base electrolyte caused homogenous precipitation of silver-containing particles in the MAO layer, which exhibited excellent antibacterial efficiency against methicillin-resistant Staphylococcus aureus (MRSA) as compared to the untreated and MAO-treated Zr...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Tetiana Sergeieva, Maria Bilichenko, Sergiy Holodnyak, Yulia V Monaykina, Sergiy I Okovytyy, Sergiy I Kovalenko, Eugene Voronkov, Jerzy Leszczynski
The reaction of 2-aryl-[1,2,4]triazolo[1,5-c]quinazolines with nucleophilic reagents (hydrazine hydrate, sodium hydroxide, sodium methoxide, hydrochloric acid) under acidic conditions leads to formation of compounds that tend to tautomerize. The products of the transformation are distinguished by the position (ortho-, meta-, para-) of the OCH3 group in the aryl moiety. To assign their structures we used the combined approach: experiment and theoretical modeling. The procedure included calculation of the relative stability for possible tautomers, simulation of UV/vis spectra for the most stable forms, and comparison of the resulting curves with the experimental spectral data taking into account the Boltzmann weighting...
December 29, 2016: Journal of Physical Chemistry. A
Ling Zhang, Yong Wang, SuWan Jin, QunZan Lu, Jiang Ji
The adsorption of sulfadiazine from water by expanded graphite (EG), a low cost and environmental-friendly adsorbent, was investigated. Several adsorption parameters (including the initial sulfadiazine concentration, contact time, pH of solution, ionic strength and temperature) were studied. Results of equilibrium experiments indicated that adsorption of sulfadiazine onto EG were better described by the Langmuir and Tempkin models than by the Freundlich model. The maximum adsorption capacity is calculated to be 16...
January 3, 2017: Environmental Technology
Jean-François Art, Aurélien Vander Straeten, Christine C Dupont-Gillain
The immunostimulation capacity of most vaccines is enhanced through antigen adsorption on aluminum hydroxide (AH) adjuvants. Varying the adsorption conditions, i.e. pH and ionic strength (I), changes the antigen adsorbed amount and therefore the ability of the vaccine to stimulate the immune system. Vaccine formulations are thus resulting from an empirical screening of the adsorption conditions. This work aims at studying the physicochemical effects of adjusting the ionic strength of commercial AH adjuvant particles suspensions with sodium chloride (NaCl)...
December 9, 2016: International Journal of Pharmaceutics
Rafaela Pignatti de Freitas, Vanessa Raquel Greatti, Murilo Priori Alcalde, Bruno Cavalini Cavenago, Rodrigo Ricci Vivan, Marco Antonio Hungaro Duarte, Ana Carolina Villas Bôas Weckwerth, Paulo Henrique Weckwerth
INTRODUCTION: The objective of the present study was to evaluate the in vitro antibiofilm activity and pH of calcium hydroxide associated with different nonsteroidal anti-inflammatory drugs (NSAIDs). METHODS: The groups analyzed were as follows: group 1, calcium hydroxide paste with propylene glycol; group 2, calcium hydroxide paste with propylene glycol + 5% diclofenac sodium; group 3, calcium hydroxide paste with propylene glycol + 5% ibuprofen; group 4, calcium hydroxide paste with propylene glycol + 5% ciprofloxacin; and group 6, positive control (without medication)...
January 2017: Journal of Endodontics
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