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Sodium hydroxide

Erika Elizabeth Morales-Irigoyen, Yolanda de Las Mercedes Gómez-Y-Gómez, Jorge Luis Flores-Moreno, Marina Olivia Franco-Hernández
Pectobacterium carotovorum (Pc) is a phytopathogenic strain that causes soft rot disease in potato (Solanum tuberosum L.), resulting in postharvest losses. Chemical control is effective for managing this disease, but overdoses cause adverse effects. Because farmers insist on using chemical agents for crop protection, it is necessary to develop more effective pesticides in which the active compound released can be regulated. In this context, we proposed the synthesis of ZnAl-NADS, in which nalidixic acid sodium salt (NADS) is linked to a ZnAl-NO3 layered double hydroxide (LDH) host as a nanocarrier...
September 18, 2017: Environmental Science and Pollution Research International
Henri Márquez-Pacheco, Anne Margrethe Hansen
Since the sequential extraction of phosphorus (P) in sediment makes it possible to determine the P potentially available for release, in this paper, we evaluate the fractions of P in sediment profiles from Valle de Bravo reservoir, a eutrophic lake in central Mexico to determine the contributions of each fraction to the internal P load (IPL). The P fractionation scheme employs sequential extractions of sediment with O2-free water (MilliQ), bicarbonate-dithionite (BD), sodium hydroxide (NaOH), hydrochloric acid (HCl), and potassium persulfate (K2S2O8-) to obtain five P fractions...
September 16, 2017: Environmental Science and Pollution Research International
Rosineide Miranda Leão, Patrícia Câmara Miléo, João M L L Maia, Sandra Maria Luz
The environmental and technical feasibility of cellulose nanocrystal production from sugarcane bagasse fibers was evaluated. First, the life cycle assessment (LCA) is presented as a methodology to investigate the most feasible form of obtainment. The environmental impacts regarding climate change and water footprint were evaluated considering a gate-to-gate process and a functional unit of 1kg. The inventory data encompassed sugarcane plantation and pretreatment, bleaching and hydrolysis for bagasse generation...
November 1, 2017: Carbohydrate Polymers
Takuma Okada, Yuta Nobunaga, Toshiisa Konishi, Tomohiko Yoshioka, Satoshi Hayakawa, Maria Ascensão Lopes, Toshiki Miyazaki, Yuki Shirosaki
Autograft has been carried out for anterior cruciate ligament (ACL) reconstruction surgery. However, it has negative aspect because patients lose their healthy ligaments from other part. We focus on a chitosan-hydroxyapatite (HAp) composite fiber as a scaffold of ligament regeneration. Chitosan- HAp composite fiber was made by using coagulation method. Chitosan-NaH2PO4 solution was coagulated with coagulation bath including calcium ion to get the mono-fiber and then treated with sodium hydroxide solution to form HAp in fiber matrix...
November 1, 2017: Carbohydrate Polymers
Longqian Xu, Guangzhu Cao, Xiaojun Xu, Shuli Liu, Zhengyang Duan, Changhua He, Yao Wang, Qihua Huang
In the present study, the influence of operating parameters and electrolyte nature on the simultaneous removal of toxic metals (cadmium, zinc and manganese) from synthetic smelting wastewater by batch electrocoagulation was investigated. This wastewater contained high concentrations of anion-cation electrolytes. Results indicated that the efficiency of heavy metals removal can be enhanced by increasing the solution pH and current density. The Fe-Fe electrode combination is more effective than the other combinations (Al-Al, Al-Fe and Fe-Al)...
September 12, 2017: Journal of Environmental Management
Meenu Bhola, Virinder Goyal, Parimala Tyagi, Tarun Kumar
Treatment of nonvital immature permanent teeth with calcium hydroxide is associated with few difficulties such as weakened tooth root, root canal reinfection, and long treatment time. Mineral trioxide aggregate (MTA) apical plug method is an alternative treatment method for open apices and has gained popularity in the recent times. This case report describes the management of a late-referral case of periapically involved, traumatized immature permanent incisor by endodontic treatment and the use of MTA apical plug...
October 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
Lavanya Rishi, Garima Mittal, Rajeev Kumar Agarwal, Taruna Sharma
In view of emerging drug resistance in pathogens, there is a need to explore alternative strategies to combat infections. Use of probiotics is one such option. In this regard, efficacy of Lactobacillus plantarum has been reported against Staphylococcus aureus. Here, we propose that cell free supernatant (CFS) of Lactobacillus paraplantarum when used in combination with conventional antibiotics viz. ampicillin and oxacillin [to which the methicillin resistant Staphylococcus aureus (MRSA) strains were originally resistant] reduce the minimum inhibitory concentrations of these antibiotics, rendering the combination either synergistic or additive against the tested MRSA strain...
September 2017: Indian Journal of Microbiology
Nicolas R Chevalier
Characterizing the tribological properties of the hair-hair interface is important to quantify the manageability of hair and to assess the performance of hair care products. Audoly et al. (Phys. Rev. Lett. 99, 164301, 2007) derived an equation relating the self-friction coefficient of an elastic fiber to the dimensions of a simple, relaxed overhand knot made from this fiber. I experimentally tested and validated their equation using nylon thread and an independent measurement of its self-friction coefficient...
September 4, 2017: Colloids and Surfaces. B, Biointerfaces
Jingzi Beiyuan, Abbe Y T Lau, Daniel C W Tsang, Weihua Zhang, Chih-Ming Kao, Kitae Baek, Yong Sik Ok, Xiang-Dong Li
Remediation of CCA-contaminated soil (Cr, Cu, and As) by biodegradable chelant-enhanced washing (EDDS, S,S-ethylene-diamine-disuccinic-acid) needs further enhancement. This study investigated the effectiveness of coupling with pre-treatment by selective dissolution and post-treatment by soil amendments, respectively. Three groups of reagents (reductants, alkaline solvents, and organic ligands) were adopted in the pre-treatment to dissolve the oxide minerals before EDDS extraction. In the post-treatment, soil amendments (coal fly ash (CFA), acid mine drainage sludge (AMDS), green waste compost (GWC)), and their mixtures) were used for a 2-month stabilization after 2-h EDDS washing...
September 9, 2017: Science of the Total Environment
Juan Carlos Gomez Martin, Claire Seaton, Marcelo Pessoa De Miranda, John Maurice Campbell Plane
We report the first direct kinetic study of the gas-phase reaction NaOH + H → Na + H2O, which is central to the chemistry of sodium in the upper atmosphere and in flames. The reaction was studied in a fast flow tube where NaOH was observed by multi-photon ionization and time-of-flight mass spectrometry, yielding k(NaOH + H, 230 - 298 K) = (3.8 ± 0.8)  10-11 cm3 molecule -1 s-1 (at 2σ confidence level), showing no significant temperature dependence over the indicated temperature range and essentially in agreement with previous estimates of the rate constant in hydrogen-rich flames...
September 13, 2017: Journal of Physical Chemistry. A
Hui Wang, Can Wei, Kaiyi Zhu, Yu Zhang, Chunhong Gong, Jianhui Guo, JiWei Zhang, Laigui Yu, Jingwei Zhang
A novel electrochemical exfoliation mode was established to prepare graphene sheets efficiently with potential applications in transparent conductive films. The graphite electrode was coated with paraffin to keep the electrochemical exfoliation in confined space in the presence of concentrated sodium hydroxide as the electrolyte, yielding ~100% low-defect (the D band to G band intensity ratio ID/IG = 0.26) graphene sheets. Furthermore, ozone was first detected with ozone test strips, and the effect of ozone on the exfoliation of graphite foil and the microstructure of the as-prepared graphene sheets was investigated...
September 13, 2017: ACS Applied Materials & Interfaces
Xuewei Jia, Mingqi Gao, Mingzhe Li, Ying Zheng, Chun-Ping Xu
Two water-soluble polysaccharides (PV-W, PV-B) were isolated and purified from fruiting bodies of P. vaninii Ljup (a traditional Chinese medicine) by hot water and sodium hydroxide, respectively. The chemical structure was analyzed by FT-IR, GC-MS analysis and 13C NMR spectra. The results illustrated that PV-W was a heteropolysaccharide, mainly composed of mannose, glucose, arabinose and galactose. PV-B was a β-1, 3-D-glucan branched with β-1, 6-D-glucose. The results of viscometry proved that PV-W and PV-B could be molecularly dispersed in water without aggregation...
September 12, 2017: Anti-cancer Agents in Medicinal Chemistry
A Hemdan, Adel M Michael
A simple, specific, and rapid kinetic study of benazepril (BNZ) hydrolysis was developed and validated using HPLC. BNZ was degraded using 0.1 N sodium hydroxide at room temperature to produce benazeprilat, which is an active metabolite of BNZ and acts as an angiotensin-converting enzyme inhibitor. Analysis was carried out using an Athena C18 column (4.6 × 250 mm, 5 µm particle size). The mobile phase consists of a mixture of phosphate buffer (pH 4.5) and acetonitrile (53 + 47, v/v) at a flow rate of 1 mL/min...
September 8, 2017: Journal of AOAC International
Ho Soo Lim, Ju Young Hwang, EunA Choi, Gunyoung Lee, Sang Sun Yoon, MeeKyung Kim
A rapid, simple, and reliable HPLC method was developed and validated to determine the presence of ferrocyanide ions (FeCNs) in food grade salts. An analytical column coupled with a guard column and mobile phase comprised of sodium perchlorate and sodium hydroxide (NaOH) were employed at a detection wavelength of 221nm. Samples were dissolved in 0.02M NaOH solution and filtered. For processed salts including herbs and spices, a C18 cartridge was applied to minimize interference from salt matrices. The method validation was based on linearity, accuracy (recovery), precision, LOD, LOQ, and measurement uncertainty...
January 15, 2018: Food Chemistry
Yosuke Nishitani, Tetsuto Kajiyama, Toshiyuki Yamanaka
We have studied the effects of silane coupling agents used for the surface treatment of fiber on the tribological properties of hemp fiber (HF) reinforced plant-derived polyamide 1010 (PA1010) biomass composites. Hemp fibers were surface-treated by two surface treatment methods: (a) alkali treatment by sodium hydroxide solution and (b) surface treatment by silane coupling agents. Three types of silane coupling agents, namely aminosilane, epoxysilane and ureidosilane were used. These HF/PA1010 biomass composites were extruded using a twin extruder, and injection-molded...
September 5, 2017: Materials
Elina Puljula, Petri A Turhanen
An efficient high-performance countercurrent chromatography (HPCCC) based method has been developed for the purification of chemically synthesized 1-adenosin-5'-yl 3-(3-methylbut-3-enyl)triphosphoric acid diester (ApppI). ApppI is an adenosine triphosphate (ATP) analogue with biological significance due to its varied actions in the body. ApppI was synthesized and purified as its tetrabutylammonium (TBA) salt and converted successfully into its more practical sodium salt form after purification. The amount of TBA hydroxide (2...
August 30, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Danping Jiang, Xumeng Ge, Quanguo Zhang, Xuehua Zhou, Zhou Chen, Harold Keener, Yebo Li
NaOH pretreatment with leachate reuse and Ca(OH)2 pretreatment were compared for improved enzymatic digestibility and biogas production from giant reed, a promising energy crop. The NaOH pretreatment with leachate reuse increased glucose yields during enzymatic hydrolysis by 2.6-fold, and methane yields during anaerobic digestion by 1.4- to 1.6-fold. However, NaOH pretreatment had a negative net benefit (i.e., revenue from increased energy production minus chemical cost). Pretreatment with 7-20% Ca(OH)2 not only improved glucose yield and methane yield by up to 2...
November 2017: Bioresource Technology
Micaela Raices, Matías E Czerwonko, Agustin Dietrich, Alejandro Da Lozzo, Enrique Beveraggi, David Smith
Symptomatic neoplastic pleural effusion (SNPE) is a significant cause of morbidity in patients with advanced neoplastic disease. These patients often present a deteriorated general condition which prevents them from undergoing pleurodesis with video-assisted thoracic surgery (VATS). We developed a minimally invasive therapeutic protocol specially designed for this population, achieved by combining chemical pleurodesis with placement of small-bore pleural catheters (PC), which resulted in early hospital discharge, low morbimortality and good therapeutic results...
August 31, 2017: Updates in Surgery
Wenjuan Qian, Youqing Meng, Ying Lu, Cui Wu, Rui Wang, Liu Wang, Cheng Qian, Zunzhong Ye, Jian Wu, Yibin Ying
Huanglongbing is a devastating citrus disease, and 'Candidatus Liberibacter asiaticus' (Las) is the most prevalent huanglongbing-associated bacterium. Its field detection remains challenging. In this work, a visual, rapid, sensitive, and carryover contamination-free method was developed for field detection of Las. Leaf samples were treated with 500 μL of 0.5 M sodium hydroxide solution for 3 min, and 50-fold dilutions were directly amplified by loop-mediated isothermal amplification. Then, a novel SYTO-9-based visual detection method was used to evaluate amplification results without uncapping operation...
September 13, 2017: Journal of Agricultural and Food Chemistry
Kenji Shiota, Takafumi Nakamura, Masaki Takaoka, Siti Fatimah Aminuddin, Kazuyuki Oshita, Takashi Fujimori
Environmentally sound treatments are required to dispose of municipal solid waste incineration fly ash (MSWIFA) contaminated with radioactive cesium (Cs) from the Fukushima Daiichi nuclear power plant accident in Japan. This study focuses on the stabilization of Cs using an alkali-activated MSWIFA and pyophyllite-based system. Three composite solid products were synthesized after mixtures of raw materials (dehydrated pyrophyllite, MSWIFA, 14 mol/L aqueous sodium hydroxide, and sodium silicate solution) were cured at 105 °C for 24 h...
August 23, 2017: Chemosphere
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