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Alkaline medium

Tìm thấy 15+ kết quả cho từ khóa "Alkaline medium"

Oxidation of crotyl alcohol by N-chloro-4-methylbenzene sulphonamide in acidic medium and in alkaline media in the presence of os(VIII) catalyst-a kinetic pathway

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Oxidation of crotyl alcohol by N -chloro-4-methylbenzene sulphonamide in acidic medium and in alkaline media in the presence of os(VIII) catalyst-a kinetic. Abstract: The kinetic pathway of oxidation of crotyl alcohol by sodium salt of N -chloro-4-methylbenzene sulphonamide (chloramine-T) in acidic and alkaline medium has been studied. In most, kinetic studies of oxidation of unsaturated alcohols have been studied in the absence [17] and presence of heterogeneous catalysts [18,19].

Spectroscopic investigation and oxidation of the anticholinergic drug atropine sulfate monohydrate by hexacyanoferrate(III) in aqueous alkaline media: a mechanistic approach

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Stoichiometry of the oxidation of atropine by hexacyanoferrate(III) in alkaline medium.. Activation parameters and thermodynamic quantities for the oxidation of atropine sulfate by hexacyanofer- rate(III) in alkaline medium with respect to the slow step of Scheme 1..

Determination of hexavalent chromium in aqueous and alkaline soil extracts

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Current methods available for the analysis of Cr(VI) in soils include extraction in alkaline medium followed by selective separation/detection and quantification.

A simple automated microplate method for determining reducing sugars in food extracts and synthetic serum using cupric-neocuproine as reductant

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chelate in alkaline medium, where the absorbance of the cuprous chelate against a reagent blank was followed at the maximal absorption wavelength of 450 nm..

In silico and in vitro evaluation of the biological activity of some organic sulfur-containing compounds

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The effect of the organic sulfur compounds on the rate of generation O. 2 on adrenaline oxidation in an alkaline medium and on the ability of the biopreparation, based on the liver of Russian sturgeon, to deactivate O.

Synthesis and characterization of poly (Vinyl photphonic acid) chitosan using tetraethylene glycoldimethacrylate crosslinker

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Besides, pH of the medium also had an effect on the hydrogel swelling. The hydrogel swelling reaches its maximum value at pH 7 and 10. At alkaline medium with pH 10.0, the acidic groups are negatively-charged and so electrostatic repulsions occur within the polymer network, which increases the swelling.. PVPACS is formed by crosslinking between the -OH groups of CS and the -P-OH groups of VPA.

Using nano-sized catalytical material of ZnO in the ozonation process for removing acid orange II

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The ozonation process using ZnO nanocatalyst for removing AOII dye was effective in alkaline medium because this favorable condition promoted the capability of OH° generation..

Nghiên cứu độ bền hòa tan anot của thép và thép biến tính trong môi trường kiềm chứa ion Clo

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Florica Simescu, Hassane Idrissi (2009), “Corrosion behaviour in alkaline medium of zinc phosphate coated steel obtained by cathodic electrochemical treatment”, Corrosion Science, 51(4), pp. The presentation of the chloride threshold level for corrosion of steel in concrete”, Corrosion Science, 39(5), pp. G.O llevbare, G.T Burstein (2003), “The inhibition of pitting corrosion of stainless steels by chromate and molybdate ions”, Corrosion Science, 45(7), pp.

Preparation of black-TiO2 and its application in photocatalytic removal of methyl orange dye

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In acidic and alkaline mediums, Methyl Orange absorbed light of different wavelengths. The conversion of Methyl Orange in an acidic medium was higher than that in a neutral and alkaline medium, as shown in figure 3.b). This result could be explained based on the PZC theory. In the acidic medium, Black-TiO 2 tended to be positively charged at the surface, which increased the electrostatic interaction with Methyl Orange in the solution and thus increased the conversion.

Protonation behavior of dextran amino acid esters

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To preliminarily test the stability of amino acid dextran esters in alkaline medium, the protonation behavior was analyzed by potentiometric titration of the samples in the range of pH values from 3 to 11 (“Forth. respectively, and back to pH value of 3 (“Back”) twice.

Highly improved electrocatalytic oxidation of dimethylamine borane on silver nanoparticles modified polymer composite electrode

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The anode reaction of the direct DMAB fuel cell is the direct oxidation of DMAB in alkaline medium as follows:. Chronoamperometric responses were recorded in a 2.0 M NaOH solution at peak potentials of Ag wire and AgNPs/PAP/GCE towards DMAB with 0.5 s time interval.. The resulting electrode was abbreviated as PAP/GCE..

Electrocoagulation for Ammonium Removal in Nam Son Landfill Leachate

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However, it is found that in the alkaline mediums, pH of the solution increases very gently or even decreases through the treatment, which due to precipitation of hydroxide ions with iron cations. removal efficiency reduced significantly in alkaline medium to only 11.23% at pH of 10 due to the reduction of ammonia in form of NH 3 gas. Fortunately, the raw Nam Son landfill leachate has the pH around 8.

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Khalil (2004), “Nickel as a catalyst for the electro-oxidation of methanol in alkaline medium”, Journal of Power Sources, 134, pp

Biochemical evaluation of some faba bean cultivars under rainfed conditions at El-Sheikh Zuwayid

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In addition, alkaline and acidic medium were tried as a method for improv- ing the extractability of the antinutritional factors (especially vicine and convicine solubility) in faba bean. In this concern, Zahrah (1985) showed that acidic medium (1% acetic acid) is much better than alkaline medium (0.5% sodium bicarbonate) in removing higher quantities of total vicine in seeds of faba bean.

Sensitive determination of hydrazine using poly(phenolphthalein), Au nanoparticles and multiwalled carbon nanotubes modified glassy carbon electrode

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Electrocatalytic detection of hydrazine on synthesized nanozeolite-supported Ag nanoparticle-modified carbon paste electrode at a negative potential in an alkaline medium. Fabrication of silver nanoparticles-polypyrrole composite modified electrode for electrocatalytic oxidation of hydrazine.. doi: 10.1016/j.synthmet . doi: 10.1002/elan.200603681. doi: 10.1016/j.electacta .

Statistical optimization of alkaline lipase production by extreme halophilic archean natrialba asiatica

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STATISTICAL OPTIMIZATION OF ALKALINE LIPASE PRODUCTION BY EXTREME HALOPHILIC ARCHEAN NATRIALBA ASIATICA. Tan et al., 2015b). They usually exhibit good chemoselectivity, regioselectivity, and enantioselectivity besides broad substrate specificity (Joseph et al., 2008). These daily growing applications lead to the demand for the lipases with new specificities and therefore the isolation of new lipases from new natural sources is increasing potential value (Hasan et al., 2009)..

Synthesis of Ni/Al2O3 catalysts via alkaline polyol method and hydrazine reduction method for the partial oxidation of methane

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They stated that the thermal stability of the whisker-like nickel phase under hydrogen atmosphere was dependent on the preparation method, which was supported on silica and obtained by reduction of nickel acetate in aqueous hydrazine medium. The reaction rate of the oxidation reaction is higher than the dissociation of CH 4 at low temperatures (-650 °C).

De novo transcriptome in roots of switchgrass (Panicum virgatum L.) reveals gene expression dynamic and act network under alkaline salt stress

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switchgrass (Panicum virgatum L.) reveals gene expression dynamic and act network under alkaline salt stress. Here we investigated the physiological responses and transcriptome changes in the roots of Alamo (alkaline-tolerant genotype) and AM- 314/MS-155 (alkaline-sensitive genotype) under alkaline salt stress..

The formation of ferulic acid from Gamma oryzanol hydrolysis under alkaline condition using ultrasonic irradiation

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Extraction and purification of ferulic acid from flax shives, wheat and corn bran by alkaline hydrolysis and pressurised solvents, Food Chemistry . -Optimization of alkaline hydrolysis of paddy straw for ferulic acid extraction, Industrial Crops and Products . 14.Liu, Z., Wang, J., Shen, P., Wang, C., and Shen, Y. purification of ferulic acid from Radix Angelicae sinensis, Separation and Purification Technology .

In silico mining for alkaline enzymes from metagenomic dna data of gut microbes of the lower termite Coptotermes gestroi in Vietnam

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Summary of the gene sequences encoding lipases having alkaline index of 0.99 STT Code gene Alkaline index Acidic index Enzyme lipase. Summary of predicted alkaline and acidic cellulases and hemicellulases in the gut flora of C. Cellulases and.