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https://www.readbyqxmd.com/read/28342758/effects-of-low-frequency-ultrasound-on-heterogenous-deacetylation-of-chitin
#1
Ngo Thi Hoai Duong, Ngo Dang Nghia
The effects of low frequency ultrasound to the heterogeneous deacetylation of chitin from the shell of white shrimp (Penaeus vannamei) were examined. The deacetylation process was carried out in the range of NaOH concentrations from 35% to 65% (w/w) with and without the ultrasound in the frequency of 37kHz, RMS=300W. The chitosan obtained was characterized in the degree of deacetylation, solubility, FT-IR and X-ray diffraction. The results showed that the behaviors of the deacetylation in two cases, with and without ultrasound, were similar but the ultrasound enhanced the deacetylation rate and therefore reduced the time of the reaction to get the same degree of deacetylation...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28342422/synergistic-desalination-of-potash-brine-impacted-groundwater-using-a-dual-adsorbent
#2
Nick P Gibb, James J Dynes, Wonjae Chang
The impact of saline mining effluent has been a significant environmental concern. Natural and modified clay-mineral adsorbents have been receiving increasing attention for salinity reduction of brine-impacted water, especially for natural resource extraction sites and surrounding environments. In this study, a dual-adsorbent treatment based on the sequential application of calcined layered double hydroxide (CLDH) and acid-treated zeolite was developed, evaluated and characterized for the desalination of potash brine-impacted groundwater...
March 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28340473/enantiomers-of-triclabendazole-sulfoxide-analytical-and-semipreparative-hplc-separation-absolute-configuration-assignment-and-transformation-into-sodium-salt
#3
Rosella Ferretti, Simone Carradori, Paolo Guglielmi, Marco Pierini, Adriano Casulli, Roberto Cirilli
Direct HPLC separation of the enantiomers of triclabendazole sulfoxide (TCBZ-SO), which is the main metabolite of the anthelmintic drug triclabendazole, was carried out using the polysaccharide-based Chiralpak AS-H and Chiralpak IF-3 chiral stationary phases (CSPs). The chromatographic behaviour of both CSPs was evaluated and compared using normal-phase and reversed-phase eluents at different column temperatures. The eluent mixture of n-hexane-2-propanol-trifluoroacetic acid 70:30:0.1 (v/v/v) and a column temperature of 40°C were identified as the best operational conditions to carry out semipreparative enantioseparations on a 1-cm I...
March 16, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28339379/stability-of-sodium-nitroprusside-in-5-dextrose-stored-at-4%C3%A2-c-in-polypropylene-syringes-protected-from-light
#4
Collin R Anderson, Deborah Collins, Trevor Laursen, Trevor Arave, Michael Helm
Sodium nitroprusside is a potent vasodilator employed intraoperatively and within critical care areas. The photolabile pharmaceutical agent has been used for decades and various stability studies have been executed. Due to potential shortages and the desire to batch compound sodium nitroprusside at a concentration of 1 mg/mL in polypropylene syringes, a new stability study was performed. Chromatographic analysis was conducted on a C18 column, with elution via an aqueous phase of 0.01 M sodium phosphate monobasic, adjusted to pH 6...
September 2016: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28330211/cellulase-production-using-natural-medium-and-its-application-on-enzymatic-hydrolysis-of-thermo-chemically-pretreated-biomass
#5
Shivani Sharma, Vinay Sharma, Arindam Kuila
Lignocellulosic bioethanol is an important renewable fuel for transportation purpose. Commercial production of lignocellulosic bioethanol mainly depends on cost of cellulase production, efficient pretreatment and enzymatic hydrolysis process. In the present study cellulase production from Aspergillus niger under submerged fermentation (SmF) was optimized using coconut water as natural medium. Maximum cellulase production (0.53 IU/mL) was achieved within 3 days of incubation using 8 % (w/v) waste paper and 0...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28322142/enhanced-release-of-immunostimulating-%C3%AE-1-3-glucan-by-autodigestion-of-the-lingzhi-medicinal-mushroom-ganoderma-lingzhi-agaricomycetes
#6
Yuina Ishimoto, Ken-Ichi Ishibashi, Daisuke Yamanaka, Yoshiyuki Adachi, Hisatomi Ito, Kentaro Igami, Toshitsugu Miyazaki, Naohito Ohno
Ganoderma lingzhi is a widely used medicinal mushroom that has antioxidative effects, ameliorates insulin resistance, and improves quality of life in patients with metabolic syndrome. Potentiation of immunity is also a major function of G. lingzhi, and this has been applied in patients with cancer. Supplementing G. lingzhi into foods reduced the metastasis of cancer cells. β-l,3-glucan is an important bioactive component of G. lingzhi. In this study we enhanced the solubilization ofimmunostimulating β-l,3-glucan by autodigestion of G...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28317732/mechanism-of-cassava-tuber-cell-wall-weakening-by-dilute-sodium-hydroxide-steeping
#7
Martin Odoch, Elna M Buys, John R N Taylor
Steeping of cassava root pieces in 0.75% NaOH in combination with wet milling was investigated to determine whether and how dilute NaOH modifies cassava cell walls. Gas chromatography data of cell wall constituent sugar composition and Fourier transform infrared (FTIR) data showed that NaOH steeping reduced the level of pectin in cassava cell walls. FTIR and wide-angle X-ray scattering spectroscopy also indicated that NaOH steeping combined with fine milling slightly reduced cellulose crystallinity. Scanning electron microscopy showed that NaOH steeping produced micropores in the cell walls and light microscopy revealed that NaOH steeping increased disaggregation of parenchyma cells...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28301017/intracanal-irrigating-solutions-prior-to-calcium-hydroxide-medication-and-its-effects-on-root-dentin-strength
#8
Leila Clarisse Hillesheim, Juliara Bellina Hoffmann, Daniela Peressoni Vieira Schuldt, Maybell Tedesco, Eduardo Antunes Bortoluzzi, Cleonice Silveira Teixeira
The aim of this study was to assess the effects of intracanal irrigation with sodium hypochlorite (NaOCl) and ethylenediaminetetracetic acid (EDTA) prior to calcium hydroxide medication on the compressive strength of root dentin. Forty-eight roots with single and straight canals were instrumented with a crown-down technique using Flexofile files and Gates Glidden burs, under 0.9% sodium chloride (NaCl) irrigation. Root canals were randomly separated into 4 groups (n=12), according to the irrigating solution: Control Group, 0...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28298696/the-impact-of-different-barrel-sanitation-approaches-on-the-spoilage-microflora-and-phenols-composition-of-wine
#9
Raffaele Guzzon, Manfred Bernard, Chiara Barnaba, Daniela Bertoldi, Konrad Pixner, Roberto Larcher
Careful control of spoilage microflora inside wine containers is a key issue during winemaking. To date, attention has been paid to the development of an effective protocol for the eradication of spoilage agents, especially Brettanomyces, from barrels. Few studies have taken into account the modifications caused by sanitation treatments in wine and wood barrels. In the present study the effects of two sanitation treatments (ozone and sodium hydroxide) on barrel spoilage microflora and the composition of the wine stored inside them were evaluated...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28293952/higher-pedot-molecular-weight-giving-rise-to-higher-thermoelectric-property-of-pedot-pss-a-comparative-study-of-cleviostm-p-and-cleviostm-ph1000
#10
Zeng Fan, Donghe Du, Hongyan Yao, Jianyong Ouyang
Poly(3,4-ethylenedioxuthiphene):poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate as the next-generation thermoelectric (TE) material. Its TE properties are strongly dependent on its chemical and electronic structures. In this paper, we investigated the effect of PEDOT molecular weight on the TE properties of PEDOT:PSS films by a comparative study on two commercial grades of PEDOT:PSS, CleviosTM P and CleviosTM PH1000. Dynamic light scattering (DLS) and Raman spectra imply that the PEDOT of CleviosTM PH1000 possesses longer conjugated chains than that of CleviosTM P...
March 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28292337/primary-tooth-vital-pulp-therapy-a-systematic-review-and-meta-analysis
#11
James A Coll, N Sue Seale, Kaaren Vargas, Abdullah A Marghalani, Shahad Al Shamali, Laurel Graham
PURPOSE: This systematic review and meta-analysis assessed outcomes in primary teeth for the vital pulp therapy (VPT) options of indirect pulp therapy (IPT), direct pulp capping (DPC), and pulpotomy after a minimum of 12 months to determine whether one VPT was superior. METHODS: The following databases were searched from 1960 to September 2016: MEDLINE, EMBASE, CENTRAL, EBSCO, ICTRP, Dissertation abstracts, and grey literature for parallel and split-mouth randomized controlled trials of at least 12 months duration comparing the success of IPT, DPC, and pulpotomy in children with deep caries in primary teeth...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28290276/meta-analysis-on-the-effect-of-interventions-used-in-cattle-processing-plants-to-reduce-escherichia-coli-contamination
#12
REVIEW
Samson Zhilyaev, Vasco Cadavez, Ursula Gonzales-Barron, Katherine Phetxumphou, Daniel Gallagher
Cattle coming from feedlots to slaughter often harbor pathogenic E. coli that can contaminate final meat products. As a result, reducing pathogenic contamination during processing is a main priority. Unfortunately, food safety specialists face challenges when trying to determine optimal intervention strategies from published literature. Plant intervention literature results and methods vary significantly, making it difficult to implement interventions with any degree of certainty in their effectiveness. To create a more robust understanding of plant intervention effectiveness, a formal systematic literature review and meta-analysis was conducted on popular intervention methods...
March 2017: Food Research International
https://www.readbyqxmd.com/read/28287605/two-way-valorization-of-blast-furnace-slag-synthesis-of-precipitated-calcium-carbonate-and-zeolitic-heavy-metal-adsorbent
#13
Evangelos Georgakopoulos, Rafael M Santos, Yi Wai Chiang, Vasilije Manovic
The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with sufficient heavy metal adsorption capacity. To this end, blast furnace slag, a residue from iron-making, is utilized as the starting material. Calcium is selectively extracted from the slag by leaching with acetic acid (2 M CH3COOH) as the extraction agent. The filtered leachate is subsequently physico-chemically purified and then carbonated to form precipitated calcium carbonate (PCC) of high purity (<2 wt% non-calcium impurities, according to ICP-MS analysis)...
February 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28279765/chitosan-zinc-oxide-polyvinylpyrrolidone-cs-zno-pvp-nanocomposite-for-better-thermal-and-antibacterial-activity
#14
M Karpuraranjith, S Thambidurai
A new biopolymer based ZnO-PVP nanocomposite was successfully synthesized by single step in situ precipitation method using chitosan as biosurfactant, zinc chloride as a source material, PVP as stabilizing agent and sodium hydroxide as precipitating agent. The chemical bonding and crystalline behaviors of chitosan, zinc oxide and PVP were confirmed by FT-IR and XRD analysis. The biopolymer connected ZnO particles intercalated PVP matrix was layer and rod like structure appeared in nanometer range confirmed by HR-SEM and TEM analysis...
March 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28277177/simultaneous-determination-of-nine-preservatives-in-food-by-liquid-chromatography-with-the-aid-of-coagulant-in-the-clean-up-process
#15
Jun Sugiura, Masahiro Nakajima
A simple HPLC method was developed for the simultaneous analysis of nine preservatives in food including benzoic acid, sorbic acid, dehydroacetic acid, methyl paraben, ethyl paraben, isopropyl paraben, propyl paraben, isobutyl paraben and butyl paraben. Samples were extracted with 60 v/v% methanol containing poly-aluminium chloride (PAC) and sodium hydroxide prior to analysis. PAC, which is normally used as a coagulant, was successfully applied to remove interfering substances from the samples. The method showed good linearity with coefficients of determination higher than 0...
February 22, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28273180/synthesis-in-vitro-and-in-vivo-evaluation-of-3%C3%AE-18f-fluorocholic-acid-for-the-detection-of-drug-induced-cholestasis-in-mice
#16
Stef De Lombaerde, Sara Neyt, Ken Kersemans, Jeroen Verhoeven, Lindsey Devisscher, Hans Van Vlierberghe, Christian Vanhove, Filip De Vos
INTRODUCTION: Drug-induced cholestasis is a liver disorder that might be caused by interference of drugs with the hepatobiliary bile acid transporters. It is important to identify this interference early on in drug development. In this work, Positron Emission Tomography (PET)-imaging with a 18F labeled bile acid analogue was introduced to detect disturbed hepatobiliary transport of bile acids. METHODS: 3β-[18F]fluorocholic acid ([18F]FCA) was prepared by nucleophilic substitution of a mesylated precursor with [18F]fluoride, followed by deprotection with sodium hydroxide...
2017: PloS One
https://www.readbyqxmd.com/read/28258982/the-sodium-salt-of-the-enantiomers-of-ricobendazole-preparation-solubility-and-chiroptical-properties
#17
Roberto Cirilli, Paolo Guglielmi, Francesca Romana Formica, Adriano Casulli, Simone Carradori
Albendazole (ABZ) is a sulfanyl-benzimidazole anthelmintic drug used worldwide in the treatment and prevention of parasitic diseases in animals and humans. Following oral administration, ABZ is rapidly oxidized into the pharmacologically active chiral sulfoxide metabolite known as ricobendazole (RBZ). As its achiral precursor, RBZ shows very low intestinal absorption due to its poor solubility in water (0.06mgmL(-1)). To the best of our knowledge, there is no known example in human medicine of a water-soluble salt form of racemic or enantiomerically pure RBZ...
February 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28258273/additive-and-reducing-effects-between-calcium-hydroxide-and-current-irrigation-solutions
#18
Zahed Mohammadi, Hamid Jafarzadeh, Sousan Shalavi, Rasoul Sahebalam, Jun Ichiro Kinoshita
Microorganisms should be considered to have the major role in starting and perpetuation of pulpo-periapical diseases. Using intracanal medicaments is necessary to gain a bacteria-free environment in the canal system. Calcium hydroxide (abbreviated as Ca(OH)2), which is the most commonly used medicament in endodontic therapy, has been shown to be effective against primary sources of infection; however, its effectiveness against some microorganisms, such as Candida albicans and Enterococcus faecalis has not been proved...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28258006/preparation-of-chitosan-hydrogel-and-its-solubility-in-organic-acids
#19
Tetsuya Furuike, Daiki Komoto, Hiroki Hashimoto, Hiroshi Tamura
The increase of the stability of chitosan (CS) in the solution is extremely important for the application of CS in various fields. In this study, we describe that the hydrogelation of CS can solve this problem. CS hydrogel was readily prepared by addition of a sodium hydroxide solution to a CS acetic acid solution. The CS hydrogel was stable in the wet state and could maintain its molecular weight for a long period of time at room temperature. The obtained CS hydrogel could be readily dissolved with addition of acids, such as acetic acid and other organic acids, as determined by measuring the pH and transmittance of the solutions...
March 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28249182/enrichment-of-sc2o3-and-tio2-from-bauxite-ore-residues
#20
Bona Deng, Guanghui Li, Jun Luo, Qing Ye, Mingxia Liu, Zhiwei Peng, Tao Jiang
As a major byproduct generated in the alumina industry, bauxite ore residue is an important reserve of scandium and titanium. In this study, the feasibility and mechanism of enriching Sc2O3 and TiO2 from a non-magnetic material, which was obtained from carbothermal reductive roasting and magnetic separation of bauxite ore residue, were investigated based on a two-step (acidic and alkali) leaching process. It was revealed that approximately 78% SiO2 and 30-40% of CaO, FeO and Al2O3 were removed from a non-magnetic material with 0...
February 16, 2017: Journal of Hazardous Materials
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