scholarly journals EFFECT OF THE ORDER OF APPLICATION OF COPPER AND ZINC COMPOUNDS ON CATALYTIC ACTIVITY IN CO-OXIDATION REACTION

2021 ◽  
pp. 173-178
Author(s):  
Ю.В. Александрова ◽  
А.Ю. Постнов ◽  
В.Н. Нараев
Keyword(s):  
Quantitative Composition ◽  
Active Components ◽  
Zinc Compounds ◽  
Co Oxidation Reaction ◽  
Copper And Zinc ◽  
Joint Application ◽  
Minimum Particle Size ◽  
Multicomponent Gas ◽  
Copper Zinc ◽  
Scope Of Application

На основе алюмохромового носителя экстракционно-пиролитическим методом (ЭПМ) синтезирована серия медь-цинк-содержащих катализаторов, проанализировано влияние порядка внесения активных компонентов (меди и цинка) на качественный и количественный состав формирующихся фаз, а также глубину размещения в гранулах носителя, структурно-прочностные и каталитические свойства образцов в процессе окисления СО кислородом воздуха.Рассчитанные значения энергии активации и предэкспоненциального множителя показали, что порядок внесения активных компонентов оказывает влияние на кинетические параметры: наилучшие результаты наблюдаются в образцах, полученных совместной пропиткой алюмохромового носителя. Константы скорости реакции окисления СО (k), рассчитанные во всем температурном диапазоне более, чем в 2 раза выше, чем при совместном внесении компонентов.С помощью электронно-зондового микроанализа изучена текстура поверхности катализаторов ЭПМ, установлено, что не смотря на порядок внесения, технология ЭПМ позволяет получать однородную текстуру - поверхность катализаторов характеризуется слоистостью с частицами чешуйчатой структуры с минимальным размером частиц во всех случаях 0,4 мкм, максимальным 3-4 мкм. Совместное внесение Zn и Cu обеспечивает равномерное распределение компонентов по сечению гранул катализаторов.Результаты работы могут быть применимы для построения технологии эффективных медь-цинковых катализаторов для процессов окисления. Область применения катализаторов – комплексная очистка многокомпонентных газовых смесей. A series of copper-zinc-containing catalysts was synthesized on the aluminum - chromium oxides base by the extraction -pyrolytic method (EPM), the effect of the order application active components (copper and zinc) on the qualitative and quantitative composition of the formed phases, as well as the depth of placement in the granules of the baser, structural strength and catalytic properties of samples during oxidation with air oxygen was analyzed.The calculated values of the activation energy and the pre-exponential multiplier showed that the order of application active components has an effect on the kinetic parameters: the best results are observed in samples obtained by joint impregnation of an alumochrome carrier. The rate constants oxidation CO (k) calculated over the entire temperature range are more than 2 times higher when the components added together.Using electron probe microanalysis, the surface texture of the EPM catalysts was studied, it was found that, despite the order of application, the EPM technology allows to obtain a homogeneous texture - the surface of the catalysts is characterized by layering with particles of a scaly structure with a minimum particle size of 0.4 microns in all cases, and maximum 3-4 microns. The joint application of Zn and Cu ensures an even distribution of the components over the cross section of the catalyst granules.The results of the work can be applied to build a technology of effective copper-zinc catalysts for oxidation processes. The scope of application of catalysts is complex purification of multicomponent gas mixtures.

Serum copper and zinc levels and copper/zinc ratio in patients with breast cancer

1994 ◽  
Vol 40 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Idris Yücel ◽  
Fikret Arpaci ◽  
Ahmet Özet ◽  
Bülent Döner ◽  
Turan Karayilanoĝlu ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Serum Copper ◽  
Copper And Zinc ◽  
Copper Zinc ◽  
Zinc Levels

scholarly journals Asparagus cochinchinensisExtract Alleviates Metal Ion-Induced Gut Injury inDrosophila: An In Silico Analysis of Potential Active Constituents

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Weiyu Zhang ◽  
Li Hua Jin
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Morphological Changes ◽  
In Silico Analysis ◽  
Atmospheric Pollutants ◽  
Network Pharmacology ◽  
Active Components ◽  
Copper Zinc ◽  
Asparagus Cochinchinensis ◽  
Epithelial Cell Death

Metal ions and sulfate are components of atmospheric pollutants that have diverse ways of entering the human body. We usedDrosophilaas a model to investigate the effect ofAsparagus cochinchinensis(A. cochinchinensis) extracts on the gut and characterized gut homeostasis following the ingestion of metal ions (copper, zinc, and aluminum). In this study, we found that the aqueousA. cochinchinensisextract increased the survival rate, decreased epithelial cell death, and attenuated metal ion-induced gut morphological changes in flies following chronic exposure to metal ions. In addition, we screened out, by network pharmacology, six natural products (NPs) that could serve as putative active components ofA. cochinchinensisthat prevented gut injury. Altogether, the results of our study provide evidence thatA. cochinchinensismight be an effective phytomedicine for the treatment of metal ion-induced gut injury.

scholarly journals The content of copper, zinc, and nickel in the selected species of edible mushrooms

2018 ◽  
Vol 30 (1) ◽  
pp. 7-10
Author(s):  
Beata Kuziemska ◽  
Andrzej Wysokiński ◽  
Dawid Jaremko ◽  
Krzysztof Pakuła ◽  
Maria Popek ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Total Content ◽  
Atomic Emission ◽  
Average Content ◽  
Suillus Luteus ◽  
Inductively Coupled ◽  
Copper And Zinc ◽  
Microwave System ◽  
Copper Zinc ◽  
Total Average

Abstract The aim of the research was to evaluate the accumulation level of copper, zinc and nickel in forest mushrooms – Bay Bolete (Xerocomus badius), Saffron Milk Cap (Lactarius deliciosus), Rough-Stemmed Bolete (Leccinum scabrum), Slippery Jack (Suillus luteus) and Parasol Mushroom (Macrolepiota procera). The analysed mushrooms were obtained from growth forests located in the Masovian Voivodeship in the following counties: Siedlce, Sokołów, Łosice and Łuków. Total content of metals was determined using the method of atomic emission spectroscopy with inductively coupled plasma, after the earlier mineralisation of materials ‘by dry combustion’ in a muffle furnace at the temperature of 450°C, and after melting of ash in a 10% solution of HCl. In the soil samples taken from the places where the tested mushrooms occur, pH in 1 mol KCl·dm-3 and total content of copper, zinc and nickel were determined by the ICP-AES method after earlier mineralization in mixture of concentration HCl and HNO3 (3:1) in a microwave system. Test results were statistically analysed with the use of software STATISTICA 12 PL (STATSOFT, TULSA, USA). The analysed mushrooms had diverse content of the determined metals. The highest total average content of copper and zinc was present in Bay Bolete: 34.83 mg ∙ kg-1d.m. for Cu and 155.50 mg ∙ kg-1d.m. for Zn, and the highest average content of nickel was contained in Rough-Stemmed Bolete – 2.98 mg ∙ kg-1d.m.. The lowest average content of copper and zinc was determined in Rough-Stemmed Bolete: 11.98 mg ∙ kg-1d.m. for Cu and 91.90 mg ∙ kg-1d.m. for Zn, and lowest total average content of nickel was present in Bay Bolete – 1.05 mg ∙ kg-1d.m. No excessive accumulation of examined heavy metals was stated in the analysed mushrooms species.

scholarly journals Copper-To-Zinc Ratio as an Inflammatory Marker in Patients with Sickle Cell Disease

Sci ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 89
Author(s):  
Mathias Abiodun Emokpae ◽  
Emmanuel Bamidele Fatimehin
Keyword(s):  
Sickle Cell Disease ◽  
Sickle Cell ◽  
Serum Levels ◽  
Serum Copper ◽  
The Body ◽  
Zinc Homeostasis ◽  
Clinical State ◽  
Cell Disease ◽  
Copper And Zinc ◽  
Copper Zinc

Sickle cell disease (SCD) is an inherited disorder and a major health challenge in Nigeria. Micronutrient deficiencies often associated with the disorder may cause inflammation and abnormal metabolism in the body. The copper-to-zinc ratio is a more relevant diagnostic measure than the concentration of either metal alone in clinical practice. This study seeks to evaluate serum levels of c-reactive protein (CRP), copper, zinc and the copper-to-zinc ratio, and to correlate the latter with CRP in adult subjects with SCD. Serum copper, zinc, CRP and plasma fibrinogen were assayed in 100 confirmed SCD patients in steady clinical state and 100 age- and sex-matched subjects with normal hemoglobin. Serum copper and zinc were assayed by the colorimetric method using reagents supplied by Centronic, Germany, while CRP and fibrinogen were assayed using reagents supplied by Sigma (St. Louis, MO, USA) and Anogen (Ontario, Canada), respectively. The copper-to-zinc ratio was calculated from serum levels of copper and zinc. The measured parameters were compared between the groups using the Students t-test, and the Pearson correlation coefficient was used to relate CRP with the other parameters. Serum copper, CRP, fibrinogen and the copper-to-zinc ratio were significantly higher (p < 0.001), while zinc level was lower in SCD patients than in controls. Serum CRP concentration correlated with copper (r = 0.10; p < 0.02), zinc (r = −0.199; p < 0.05) and the copper-to-zinc ratio (r = 0.312; p < 0.002), but the correlation between CRP and fibrinogen was not significant. Inflammation may modulate copper and zinc homeostasis, and the copper-to-zinc ratio may be used as a marker of nutritional deficiency and inflammation in SCD patients.

The effect of stage of growth on the copper, zinc, manganese, and molybdenum contents of Algerian oats grown of thirteen soils

1952 ◽  
Vol 3 (4) ◽  
pp. 343 ◽  
Author(s):  
CH Williams ◽  
CWE Moore
Keyword(s):  
Trace Metal ◽  
Soil Ph ◽  
Dry Matter ◽  
Growing Period ◽  
Stages Of Growth ◽  
Early Stages ◽  
Copper And Zinc ◽  
Rate Of Increase ◽  
Metal Contents ◽  
Copper Zinc

Algerian oats were grown on 13 soils in the glass-house. Plants were harvested at intervals throughout the growing period, and when large enough were divided into leaf, stem, and (in later harvests) flowers or fruits. Copper, zinc, manganese, and molybdenum were determined on the separate plant fractions. Characteristic changes in the trace metal contents of the plant with growth were found for each element. These changes were generally similar irrespective of the soil on which the plants were grown. With the exception of manganese, the availability of the element in the soil did not affect the trend of the changes as the plant matured, but only the amount present. The uptake of each of the four elements continued through the whole period of growth. The total amounts of copper and zinc in both the leaf and the stem decreased after flowering as translocation to the grain proceeded. The amount of manganese in the leaf increased throughout the period of growth, although the rate of increase was less after flowering. The amount of molybdenum in the leaf increased until flowering, after which there was little further change. The rate of uptake of manganese was approximately equal to the rate of production of dry matter, whereas that of molybdenum, copper, and zinc was relatively greater in the early stages of growth. There was no observable influence of soil pH on the availability of copper and zinc, but that of manganese decreased with increasing pH. The availability of molybdenum was affected by the combined influences of soil pH and soil iron.

Variation in nitrogen, sulfur, selenium, cobalt, manganese, copper and zinc contents of grain from wheat and two lupin species grown in a range of Mediterranean environments

1981 ◽  
Vol 32 (1) ◽  
pp. 47 ◽  
Author(s):  
CL White ◽  
AD Robson ◽  
HM Fisher
Keyword(s):  
Lupinus Albus ◽  
Soil Types ◽  
White Lupin ◽  
Wheat Grain ◽  
Annual Average ◽  
Protein Utilization ◽  
Copper And Zinc ◽  
Copper Zinc ◽  
Sulfur Supply ◽  
Manganese Concentrations

Grains of Lupinus angustifolius, Lupinus albus and Triticum aestivum were sampled from 23 sites selected on the basis of three major rainfall categories (annual average greater than 450 mm; 325- 450 mm; less than 325 mm), and four soil types (infertile sands, sandy loams, sand over clay, and alkaline). The variation in concentrations of most nutrients were as great within rainfall or soil categories as between these categories, although selenium concentrations tended to be lower in grain from the highest rainfall zone. Lupin seed contained higher concentrations of nitrogen, sulfur, selenium, copper and zinc than wheat. The concentration of manganese varied between species and sites, with L. albus containing levels of up to 2000 �g/g at several sites. There was a positive correlation between manganese and cobalt concentrations in grain of L. angustifolius and L. albus at sites where manganese concentrations were above 50 and 500 �g/g respectively. The grain of L. angustifolius contained significantly lower concentrations of nitrogen, manganese, cobalt and copper than did L. albus, although there were considerable site differences. Nitrogen/sulfur ratios were wider in lupins (24/l for L. albus and 20.5/l for L. angustifolius) than in wheat grain (15.4/l). The ratios showed up to twofold range over all sites, which suggests that limitations in sulfur supply occurred at sites with a wide ratio. The concentrations of selenium, copper, zinc and cobalt were below the recommended dietary allowance for livestock at many sites, while the manganese concentrations in white lupin at several sites were at potentially toxic levels for animals. The nitrogen/sulfur ratio of grain was also outside the optimum for protein utilization by livestock. These findings highlight the need for some form of trace element and protein monitoring to avoid potential deficiency and toxicity problems in livestock consuming the grain.

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