Showing papers on "Sodium dichromate published in 2016"

Hepatoprotective effect of Taraxacum officinale leaf extract on sodium dichromate‐induced liver injury in rats

Abstract: Taraxacum officinale (L.) Weber, commonly known as Dandelion, has been widely used as a folkloric medicine for the treatment of liver and kidney disorders and some women diseases such as breast and uterus cancers. The main objective of the present study was to assess the efficiency of T. officinale leaf extract (TOE) in treating sodium dichromate hazards; it is a major environmental pollutant known for its wide toxic manifestations witch induced liver injury. TOE at a dose of 500 mg/kg b.w was orally administered once per day for 30 days consecutively, followed by 10 mg/kg b.w sodium dichromate was injected (intraperitoneal) for 10 days. Our results using Wistar rats showed that sodium dichromate significantly increased serum biochemical parameters. In the liver, it was found to induce an oxidative stress, evidenced from increase in lipid peroxidation and changes in antioxidative activities. In addition, histopathological observation revealed that sodium dichromate causes acute liver damage, necrosis of hepatocytes, as well as DNA fragmentation. Interestingly, animals that were pretreated with TOE, prior to sodium dichromate administration, showed a significant hepatoprotection, revealed by a significant reduction of sodium dichromate-induced oxidative damage for all tested markers. These finding powerfully supports that TOE was effective in the protection against sodium dichromate-induced hepatotoxicity and genotoxicity and, therefore, suggest a potential therapeutic use of this plant as an alternative medicine for patients with acute liver diseases.

Effect of plasma treatment and grafting of β-cyclodextrin on color properties of wool fabric dyed with Shrimp shell extract

Abstract: The aim of this study was to evaluate the effect of low temperature plasma (LTP) treatment and grafting of beta-cyclodextrin (β-CD) on dyeing and fastness properties of wool fabrics using natural dye extracted from shrimp shell. Aluminum sulfate, iron sulfate, tin chloride, copper sulfate, and sodium dichromate were used as mordant and the dyeing of samples was conducted after the pre-mordanting process. Scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR) were used to study the morphological and chemical changes of the fibers. Also, the antimicrobial properties of fabrics were quantitatively evaluated against Staphylococcus aureus according to AATCC 100-1993 test method. The results showed using of sodium dichromate as mordant could be attained to green shade after dyeing fabrics. The color difference and color strength of samples were improved by increasing the sodium dichromate concentration and β-CD in the after-treatment process. FTIR analysis indicated a significant increa...

High throughput cell-based assay for identification of glycolate oxidase inhibitors as a potential treatment for Primary Hyperoxaluria Type 1

Abstract: Glycolate oxidase (GO) and alanine:glyoxylate aminotransferase (AGT) are both involved in the peroxisomal glyoxylate pathway. Deficiency in AGT function causes the accumulation of intracellular oxalate and the primary hyperoxaluria type 1 (PH1). AGT enhancers or GO inhibitors may restore the abnormal peroxisomal glyoxylate pathway in PH1 patients. With stably transformed cells which mimic the glyoxylate metabolic pathway, we developed an indirect glycolate cytotoxicity assay in a 1,536-well plate format for high throughput screening. This assay can be used to identify compounds that reduce indirect glycolate-induced cytotoxicity by either enhancing AGT activity or inhibiting GO. A pilot screen of 4,096 known compounds identified two membrane permeable GO inhibitors: dichromate salt and colistimethate. We also developed a GO enzyme assay using the hydrogen peroxide-Amplex red reporter system. The IC50 values of potassium dichromate, sodium dichromate, and colistimethate sodium were 0.096, 0.108, and 2.3 μM in the GO enzyme assay, respectively. Further enzyme kinetic study revealed that both types of compounds inhibit GO activity by the mixed linear inhibition. Our results demonstrate that the cell-based assay and GO enzyme assay developed in this study are useful for further screening of large compound libraries for drug development to treat PH1.

Antibacterial antiflaming electric insulating glove material

Abstract: The invention relates to an antibacterial antiflaming electric insulating glove material The material is prepared from the following ingredients of asphalt, zinc phosphate, sodium dihydrogen phosphate, oleate, fatty acid sodium, sodium dichromate, shell powder, potato starch acrylamnide, zirconite powder, fluorinated silicone rubber, calcined lime, polyether modified polysiloxane, methyl isobutyl ketone, aluminum fluorate powder, acrylon-butadiene-styrol copolymer, ammonium dihydrogen phosphate, zinc stannate, calcium propionate, oxazolidone, methylene bromide, soybean meal, dibasic lead phosphate, silicon dioxide powder, titanium dioxide powder, quartz sand powder, pine-soot ink, oxidized paraffin, glyceryl trioleate, sulfamic acid, rubber oil and oxtyl phenol polyoxyethylene ether The antibacterial antiflaming electric insulating glove material has more excellent antiflaming performance, acid and alkali resistance, anti-mildew performance, antibacterial performance and insulation performance and improves product property

Characterization and Treatment of Sulfochromic Residues Generated from Soil Analysis

Abstract: Research and routine analysis laboratories produce sizeable amounts of residues as a result of experiments and by-products of chemical reactions. An example of that is soil analysis, in which a sulfochromic solution is used for the determination of organic matter content. This solution contains sodium dichromate and sulfuric acid, reagents that oxidize the soil’s organic fractions and contribute to the presence of chromium in laboratory residues discharged into the environment. In an attempt to find solutions to environmental problems, the aim of the present study was to quantitatively and qualitatively characterize chromium-contaminated residues generated during soil analysis. Therefore, management methods were proposed in order to recover chromium in its trivalent form (Cr3+) by precipitation. The use of biochemical oxygen demand, chemical oxygen demand, nitrogen, phosphorus, and metals to characterize the samples revealed the presence of 16.76 g L−1 of total chromium, with 4.19 g L−1 of Cr(VI). By means of ozonation, 68 % of the chromium was converted to liquid form and, after being reduced with bisulfite, it was turned into chromium sulfate (III). The remainder, 32 %, was kept with the other metals present in the solid form (sludge).

Preparation method of novel complex dye

Abstract: The invention relates to a preparation method of a novel complex dye. The preparation method comprises the following steps of dissolving 2-amidogen-5-nitrophenol and 4-amyl phenol into a sodium hydroxide and sodium nitrite solution to obtain a solution A; dissolving 2-naphthol into a sodium hydroxide and sodium carbonate solution to obtain a solution B; dripping the solution A into hydrochloric acid, an auxiliary agent and ice, then, adding the solution B to complete a coupling reaction, and performing filtering to obtain azo dye filter cake; mixing sodium dichromate, glacial acetic acid and water, and adding glucose to obtain a chromium acetate solution; adding water into the azo dye filter cake for pulping; regulating the pH value, and performing temperature rise; adding the chromium acetate solution and anhydrous sodium acetate; adding ethylene glycol monobutyl ether; performing temperature rise to complete complex reaction; performing distillation; adding lauryl amine and formic acid into remaining liquid; after reaction completion, performing filtering, washing and drying to obtain the novel complex dye. The novel complex dye has excellent temperature resistance and weathering resistance performance, and can be applied to metal surface coatings with higher requirements.

Method for preparing trivalent chromium black passivation solution

Abstract: The invention provides a method for preparing a trivalent chromium black passivation solution. The method comprises the steps that chromium trioxide and sodium dichromate are firstly taken to be added into water, a reducing agent is added, stirring is carried out, silica sol is added, pH is adjusted to range from 1.0 to 2.0, and basic liquid is obtained; then glycolic acid, malic acid, sodium sulphide, ammonium ferrous sulfate, sodium molybdate, titanyl sulfate and gallotannic acid are added into water, mixing is carried out, and a mixture A is obtained; then the basic liquid is contained in a ball milling tank, the mixture A and hydroxyethylidene-1,1-diphosphonic acid are added, aluminum oxide ceramic balls are adopted as a ball milling medium for ball milling, and a mixture B is obtained; and finally sodium hexametaphosphate, sodium dihydrogen phosphate, sodium nitrate, stearic acid and methyl oleate are added into the mixture B, a shear emulsifying machine is used for stirring, and the trivalent chromium black passivation solution is obtained. A passivation film formed through the passivation solution is jet-black and bright in appearance and uniform in color, the surface is uniform and level, the film layer is dense, and good corrosion resisting capacity and wide application prospects are achieved.

Method for preparing 2-octyl sulfoxide-1,4-naphthoquinone

Abstract: The invention discloses a method for preparing 2-octyl sulfoxide-1,4-naphthoquinone. The method solves the problem that naphthoquinone compounds extracted and separated only from plants are far from enough to meet research and application requirements. The method includes the specific steps that firstly, 2-mercapto-1,4-naphthoquinone is synthesized, 1,4-naphthoquinone and 1-octyl mercaptan react for 3-5 hours at room temperature, sodium dichromate and concentrated sulfuric acid are added, reaction continues for 5-10 min, and 2-mercapto-1,4-naphthoquinone is obtained after a product is processed; then, 2-octyl sulfoxide-1,4-naphthoquinone is synthesized, 3-chloroperoxybenzoic acid and 2-mercapto-1,4-naphthoquinone react for 1.5-2.5 hours at the temperature of 0 DEG C, and 2-octyl sulfoxide-1,4-naphthoquinone is obtained after the reaction product is processed. The method is simple in synthesis route and low in reaction temperature, and the obtained 2-octyl sulfoxide-1,4-naphthoquinone product is obvious in anti-caner effect and high in cancer cell selectivity.

Synthesis method of 9-chloro-10-bromobenzene anthracene

Abstract: The invention discloses a synthesis method of 9-chloro-10-bromobenzene anthracene, and belongs to the technical field of chemical synthesis. According to the method, benzene is used as raw materials; firstly, stannous chloride and Br2 are mixed; butadiene is dripped; zinc powder is added for preparing 1-chloro-4-bromonaphthalene; the 1-chloro-4-bromonaphthalene is mixed with benzene to generate 2-chloro-3-bromonaphthalene under the effects of peroxyacetic acid and sodium dichromate; then, butene diacid and glacial acetic acid are added; hydrogen gas is introduced for reaction; obtained materials are mixed with the prepared 1-hydroxytri-carballylic acid, concentrated sulfuric acid and concentrated nitric acid; then, zinc powder and hydrochloric acid are added; the reaction is fast taken under the effect of Ni/sodium bentonite catalysts; the materials are taken out and are subjected to still standing, filtering and drying; the 9-chloro-10-bromobenzene anthracene is obtained. The synthesis method has the beneficial effects that the synthesis condition is simple; byproducts obtained in the synthesis process are few; no secondary pollution is caused on the environment; the yield of an obtained product is high, and reaches more than 99.2 percent.

Heatproof curing adhesive material composition for transformer and preparation method of heatproof curing adhesive

Abstract: The invention discloses a heatproof curing adhesive material composition for a transformer and a preparation method of a heatproof curing adhesive. The composition is prepared from urea resin, benzoyl peroxide, dimethylaniline, polyoxyethylene sorbitan monooleate, ferrous sulfate, sodium dichromate, sodium bicarbonate, ethyl alcohol and acetone, wherein relative to 100 weight parts of the urea resin, the content of the benzoyl peroxide is 5-20 weight parts, the content of the dimethylaniline is 3-15 weight parts, the content of the polyoxyethylene sorbitan monooleate is 1-5 weight parts, the content of the ferrous sulfate is 10-30 weight parts, the content of the sodium dichromate is 15-30 weight parts, the content of the sodium bicarbonate is 5-15 weight parts, the content of the ethyl alcohol is 10-20 weight parts, and the content of the acetone is 15-35 weight parts. Through the design, heat resistance is good, the usability of the transformer in a high temperature environment is greatly improved, and safety is improved.

Preparation method of hexyl aldehyde by sodium dichromate oxidation of n-hexyl alcohol

Abstract: The invention provides a preparation method of n-hexyl aldehyde by sodium dichromate oxidation of n-hexyl alcohol. The method comprises the following steps: 1) adding n-hexyl alcohol in a reaction device; 2) controlling the reaction temperature, and adding a sodium dichromate oxidation liquid; and 3) distilling and collecting a product n-hexyl aldehyde, and collecting unreacted n-hexyl alcohol, a by-product of hexyl hexanoate and chromium-containing sulfate from the reaction bed material by an extraction layering method. The product obtained by the preparation method of n-hexyl aldehyde by sodium dichromate oxidation of n-hexyl alcohol does not contain chlorine, and is more advanced compared to the prior art.

A kind of method that hexanal is prepared in sodium dichromate oxidation

Abstract: The invention provides the method that n-hexyl aldehyde prepared by a kind of sodium dichromate oxidation hexanol, including step: 1) in reaction unit, add hexanol；2) control temperature of reactor, add sodium dichromate oxidation solution；3) product n-hexyl aldehyde is collected in distillation, uses extracting and demixing method to collect unreacted hexanol, side-product hexyl hexanoate and chromium-containing acid salt reaction bed materialThe composition not containing chlorine in the product that n-hexyl aldehyde method obtains is prepared in the sodium dichromate oxidation of the present invention, and relatively prior art is the most progressive

Method of preparing sodium dichromate

Abstract: The invention discloses a method of preparing sodium dichromate, comprising the steps of (1), subjecting chromite and alkali solution to liquid oxidation, subjecting slurry to solid-liquid separation after reacting to obtain liquid phase A and solid phase B; (2), washing the solid phase B with circulatory alkali liquid, subjecting post-washing slurry to solid-liquid separation to obtain liquid phase C and solid phase D; (3), crystal-dissolving the solid phase D with sodium chromate crystal with water and iron residue washing liquid, carrying out solid-liquid separation to obtain crystal-dissolved liquid and iron residue, washing the iron residue with water, and returning the washing liquid to crystal dissolution; (4), preparing circulatory alkali liquid with the liquid phase C and crystal-dissolved liquid, adding an acid solution to the remaining crystal-dissolved liquid to adjust pH, and carrying out aluminum-silicon removal, acidifying, crystallizing and separating to obtain sodium dichromate and sodium sulfate; preparing. The process of the invention is simple, the flow is short, and the method is highly operable, low in cost and free of wastewater and is an effective way of chromium salt industry to make recycle use and reduce pollution.