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Sodium hydroxide

Ingo de Vries, Sarah Schreiber, Daniel Boßmann, Zawadi Hellmann, Jens Kopatz, Harald Neumann, Sascha Beutel
Polysialic acid (polySia) is a promising molecule for various medical applications (e.g., treatment of inflammatory neurodegenerative diseases). In this study a complete production process for human-identical α-(2,8)-linked polySia was developed using a disposable bioreactor for cultivation of Escherichia coli K1 and single-use membrane adsorbers for downstream processing (DSP). The cultivation process was optimized to minimize complex media components and a maturation process after cultivation was established...
March 2018: Biotechnology Reports
Jicheng Yu, Jia Lu, Yong Kang
Chemical precipitation method was adopted to remove sulfate from wet flue gas desulfurization (FGD) wastewater and mixtures of Ca(OH)2 (CH) and NaAlO2 (SA) were used as precipitants. The mechanisms of sulfate removal were explored according to the experimental and simulated results. These showed that three kinds of precipitations, which were gypsum, ettringite and co-precipitation onto aluminum hydroxides, were formed when sulfate in water reacted with CH and SA. The optimum operation condition for removing sulfate was that the molar ratio of CH/SA was 2, the initial pH value 5, the precipitant dosage 15 g/L, the reaction time 20 min, and the reaction temperature 55 °C...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Gaoqin Liu, Peirong Lu, Lei Chen, Wenpeng Zhang, Mengjiao Wang, Dan Li, Xueguang Zhang
PURPOSE: Corneal neovascularization (CrNV) arises from many causes including corneal inflammatory, infectious, or traumatic insult, and frequently leads to impaired vision. This study seeks to determine the role of B-cell leukemia/lymphoma 10 (BCL-10) in the development of experimental CrNV. METHODS: Corneas from BCL-10 knockout (KO) mice and wild-type (WT) mice were burned by sodium hydroxide (NaOH) to create the CrNV model and neovascular formation in the corneas was assessed 2 weeks later...
March 8, 2018: Eye
Hongbin Zhong, Tingjun Wang, Guili Lian, Changsheng Xu, Huajun Wang, Liangdi Xie
Sinoatrial node fibrosis is involved in the pathogenesis of sinus sick syndrome (SSS). Transient receptor potential (TRP) subfamily M member 7 (TRPM7) is implicated in cardiac fibrosis. However, the mechanisms underlying the regulation of sinoatrial node (SAN) fibrosis in SSS by TRPM7 remain unknown. The aim of this study was to investigate the role of angiotensin II (Ang II)/TRPM7/Smad pathway in the SAN fibrosis in rats with SSS. The rat SSS model was established with sodium hydroxide pinpoint pressing permeation...
March 6, 2018: Heart and Vessels
Moustafa N Aboushelib, Hala Ragab, Mohamed Arnaot
PURPOSE: To evaluate the influence of different aging techniques on zirconia-composite microtensile bond strength using different surface treatments over a 5-year follow-up period. MATERIALS AND METHODS: Zirconia disks received three surface treatments: airborne-particle abrasion with 50-μm aluminum oxide particles, selective infiltration etching (SIE), or fusion sputtering (FS). The specimens were bonded to pre-aged composite disks using a composite cement containing phosphate monomers (Panavia F2...
2018: Journal of Adhesive Dentistry
Vladimir B Orel, Nadezhda M Vitkovskaya, Vladimir B Kobychev, Boris A Trofimov
Transition metal-free C-vinylation of acetone with phenylacetylene catalyzed by superbases MOH/DMSO and tBuOM/DMSO (M = Na, K) has been theoretically evaluated in B3LYP/6-311++G**//B3LYP/6-31+G* approach to rationalize similarities and differences in activity of the above catalytic systems. The close solvate surroundings of sodium and potassium tert-butoxides has been studied. Formation of tBuOM•nDMSO complexes, their structure and thermodynamic stability is discussed in comparison with similar complexes of alkali metal hydroxides MOH•nDMSO...
March 5, 2018: Journal of Organic Chemistry
A C S Marinho, T T To, R P Darveau, B P F A Gomes
AIM: To investigate the influence of auxiliary chemical substances (ACS) and calcium hydroxide [Ca(OH)2 ] dressings on LPS/lipid A detection and its functional ability in activating Toll-like receptor 4 (TLR4). METHODOLOGY: Fusobacterium nucleatum pellets were exposed to antimicrobial agents as following: 1) ACS: 5.25%, 2.5% and 1% sodium hypochlorite solutions (NaOCl), 2% chlorhexidine (CHX) (gel and solution) and 17% ethylenediaminetetraacetic acid (EDTA); 2) Intracanal medicament: Ca(OH)2 paste for various periods (1h, 24h, 7 days, 14 days and 30 days); 3) Combination of substances: a) 2...
March 5, 2018: International Endodontic Journal
Ishmael Ayim, Haile Ma, Evans Adingba Alenyorege, Zeshan Ali, Prince Ofori Donkor
The effect of ultrasound pretreatment using Single Frequency Counter Current Ultrasound (SFCCU) on the enzymolysis of tea residue protein (TRP) extracted with sodium hydroxide was investigated. The concentration of TRP hydrolysate, enzymolysis kinetics and thermodynamic parameters after SFCCU pretreatment were determined and compared with traditional enzymolysis. The results indicated that both ultrasound assisted and traditional enzymolysis conformed to first-order kinetics within the limits of the studied parameters...
March 2018: Journal of Food Science and Technology
Yafei Shen
The non-metallic fraction from waste printed circuit boards (NMF-WPCB) generally consists of plastics with high content of Br, glass fibers and metals (e.g. Cu), which are normally difficult to dispose. This work aims to study the chemical pretreatments by using alkalis, acids and alkali-earth-metal salts on pyrolysis of NMF-WPCB. Char (60-79%) and volatile matter (21-40%) can be produced via the pyrolysis process. In particular, the ash content can reach up to 42-56%, which was attributed to the high content of glass fibers and other minerals...
February 21, 2018: Waste Management
Minhwa Oh, Eugene Huh, Myung Sook Oh, Ji-Seon Jeong, Seon-Pyo Hong
We developed a diagnostic method for Parkinson's disease by simultaneously analyzing biogenic amines and their metabolites using reverse-phase high-performance liquid chromatography coupled with integrated pulsed amperometric detection (RP-HPLC-IPAD) method. Dopamine (DA), 3, 4-dihydroxyphenylacetic acid (DOPAC), serotonin (5-HT), 5-hydroxyindolacetic acid (5-HIAA), and homovanillic acid (HVA) were used as biomarkers to diagnose Parkinson's disease. All target components were detected with good sensitivity using sodium hydroxide (as a post-column eluent)...
February 15, 2018: Journal of Pharmaceutical and Biomedical Analysis
Qiying Liu, Yuanming Guo, Xiumei Sun, Qing Hao, Xin Cheng, Lu Zhang
We propose a method for the simultaneous determination of 15 kinds of polycyclic aromatic hydrocarbons in marine samples (muscle) employing gas chromatography with mass spectrometry after saponification reaction with ultrasonic and solid phase extraction. The experimental conditions were optimized by response surface method. In addition, the effects of different lye and extractants on polycyclic aromatic hydrocarbons extraction were discussed and the result was the saturated sodium carbonate was first used as the primary saponification reaction and extracted with 10 mL of ethyl acetate and the second time 1 mol/L of sodium hydroxide and 10 mL of n-hexane were used to achieve better results...
February 22, 2018: Journal of Separation Science
Wenjin Wan, Yuehua Li, Xingping Ren, Yinping Zhao, Fan Gao, Heyun Zhao
Two dimensional (2D)SnO2 nanosheets were synthesized by a substrate-free hydrothermal route using sodium stannate and sodium hydroxide in a mixed solvent of absolute ethanol and deionized water at a lower temperature of 130 °C. The characterization results of the morphology, microstructure, and surface properties of the as-prepared products demonstrated that SnO2 nanosheets with a tetragonal rutile structure, were composed of oriented SnO2 nanoparticles with a diameter of 6-12 nm. The X-ray diffraction (XRD) and high-resolution transmission electron microscope (FETEM) results demonstrated that the dominant exposed surface of the SnO2 nanoparticles was (101), but not (110)...
February 16, 2018: Nanomaterials
Ana Carolina Dias Guimarães, Kassio Ferreira Mendes, Fabrícia Cristina Dos Reis, Thais Fornasiero Campion, Pedro Jacob Christoffoleti, Valdemar Luiz Tornisielo
The physicochemical properties of soil are fundamental to quantification of the fate of herbicides. Thus, the aim of this research was to evaluate the fate of diuron, hexazinone, and metribuzin in five soils (Clay-1, Clay-2, Loam-1, Loam-2, and Sand), presenting variation in clay content, cation exchange capacity (CEC), pH, and organic carbon (OC). Herbicides radiolabeled with14 C were applied, and the14 C-CO2 released from mineralization was trapped in 0.2 mol L-1 sodium hydroxide solution. The degradation ratio, as well as herbicide-bound residues (non-extractable), transformation products, and residues extractable from soil, was also evaluated...
February 19, 2018: Environmental Science and Pollution Research International
Outi Swanljung, Miira M Vehkalahti
INTRODUCTION: The aim of this study was to assess the role of root canal irrigants and medicaments in endodontic injuries verified in Finland and to estimate the rate of such events over time. METHODS: The study material comprised all endodontic injuries verified by the Patient Insurance Centre in 2002 to 2006 (n = 521) and 2011 to 2013 (n = 449). The data, based on patient documents scrutinized by 2 specialists in endodontics, included patients' and dentists' sex and age and the service sector...
February 16, 2018: Journal of Endodontics
M Qamar, M I Ahmed, M Qamaruddin, M Asif, M Sanhoob, O Muraza, M Y Khan
Herein, pore size, crystalinity, and Si/Al ratio of mesoporous ZSM-5 (MFI) nanocrystals was controlled by synthesis parameters, such as surfactant concentration ([3-(trimethoxysilyl)propyl] hexa-decyl dimethyl ammonium chloride), sodium hydroxide concentrations, synthesis temperature and time. The morphology, surface structure and composition of the MFI particles was systematically investigated. More notably, the mesopore-dependent catalytic activity of ZSM-5 was evaluated by studying the cracking of n-hexane...
August 1, 2018: Journal of Nanoscience and Nanotechnology
Rodrigo U Ichikawa, João P R L L Parra, Murillo L Martins, Walter K Yoshito, Margarida J Saeki, Xavier Turrillas, Luis G Martinez
Iron-excess Mn-Zn ferrite nanoparticles were prepared by coprecipitation with sodium hydroxide (NaOH) at different concentrations (0.1, 0.2, 0.5 and 1.0 mol/L). The results of X-ray diffraction (XRD) analysis using Whole Powder Pattern Modeling (WPPM) showed that higher concentrations of NaOH promote crystallite growth and broader dispersion in crystallite sizes. Energy dispersive X-ray spectroscopy indicates that zinc loss is noticeable when [NaOH] ≥ 0.2 mol/L. XRD revealed also a significant less-crystalline phase contribution alongside the main peaks of the nanocrystalline cubic spinel ferrite phase...
August 1, 2018: Journal of Nanoscience and Nanotechnology
Qing-Yang Gu, Xiao Qiu, Jing-Jing Liu, Min Fu, Jian-Ping Chao, Rui-Jun Ju, Xue-Tao Li
Diclofenac sodium (abrr. DS) and indomethacin (abrr. IMC) have been intercalated into the layered terbium hydroxide (LTbH) by anion exchange method. Chemical compositions, thermostability, morphology, luminescence property, release behaviors and cytotoxic effects have been investigated. The DS molecules may embed between layers with a bilayered arrangement and the IMC may correspond to a monolayered arrangement. The Tb3+ luminescence in DS-LTbH and IMC-LTbH composites were enhanced compared with LTbH precusor and the luminescence intensity increases with the deprotonation degree...
August 1, 2018: Journal of Nanoscience and Nanotechnology
Anongnart Wannapokin, Rameshprabu Ramaraj, Kanda Whangchai, Yuwalee Unpaprom
Biogas production from anaerobic co-digestion of fallen teak leaves ( Tectona grandis ) and microalgae ( Chlorella vulgaris ) were investigated. In this study, teak leaves and algae mixtures with or without pretreatment were used as the substrates and digested in 1-L of anaerobic fermenter, then optimal conditions were performed in 6-L fermenter. Pretreatment was performed using sodium hydroxide (NaOH) solution (w/v) at different conditions (0, 2, 3 and 4%), with different total solid (TS) ratios (10, 15 and 20%)...
February 2018: 3 Biotech
Ting Wu, Qinghong Kong, Hongkai Zhang, Junhao Zhang
NiAl layered double hydroxide (NiAl-LDH) was synthesized by co-precipitation method. And sodium dodecyl sulphate (SDS) as modifier was utilized to enlarge the d-spacing of NiAl-LDH to obtain SDS-NiAl-LDH. PP/SDS-NiAl-LDH nanocomposites were prepared with different amount of SDS- NiAl-LDH and PP by melt intercalation method. The results of XRD and TEM confirmed that intercalated and exfoliated-intercalated structures were formed. Compared with pure PP, PP/SDS- NiAl-LDH nanocomposites exhibited high thermal stability and residual to the presence of barrier effect of NiAl-LDH layers...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Xiaohui Chen, Ruting Xu, Yanting Xu, Hui Hu, Shouquan Pan, Hongkun Pan
Sawdust was expected to remove impurities in waste lubricant, and was modified with sodium hydroxide and triethanolamine, which can ameliorate its surface properties and improve its adsorption capacity. The increase of hydroxyl groups, the decrease of carbonyl groups and grafting new azyl after modification were beneficial for the adsorption of impurities. The surface area of modified sawdust is 0.969 m 2 g -1 , which is nearly 1.39 times as much as raw sawdust. The point of zero charge for modified sawdust decreased from 6...
February 1, 2018: Journal of Hazardous Materials
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