Pure Raw Materials Research Articles

Ergot alkaloid control in biotechnological processes and pharmaceuticals (a mini review).

The control of ergot alkaloids in biotechnological processes is important in the context of obtaining new strain producers and studying the mechanisms of the biosynthesis, accumulation and secretion of alkaloids and the manufacturing of alkaloids. In pharmaceuticals, it is important to analyze the purity of raw materials, especially those capable of racemization, quality control of dosage forms and bulk drugs, stability during storage, etc. This review describes the methods used for qualitative and quantitative chemical analysis of ergot alkaloids in tablets and pharmaceutic forms, liquid cultural media and mycelia from submerged cultures of ergot and other organisms producing ergoalkaloid, sclerotias of industrial Claviceps spp. parasitic strains. We reviewed analytical approaches for the determination of ergopeptines (including their dihydro- and bromine derivatives) and semisynthetic ergot-derived medicines such as cabergoline, necergoline and pergolide, including precursors for their synthesis. Over the last few decades, strategies and approaches for the analysis of ergoalkaloids for medical use have changed, but the general principles and objectives have remained the same as before. These changes are related to the development of new genetically improved strains producing ergoalkaloids and the development of technologies for the online control of biotechnological processes and pharmaceutical manufacturing ("process analytical technologies," PAT). Overall, the industry is moving toward "smart manufacturing." The development of approaches to production cost estimation and product quality management, manufacturing management, increasing profitability and reducing the negative impact on personnel and the environment are integral components of sustainable development. Analytical approaches for the analysis of ergot alkaloids in pharmaceutical raw materials should have high enough specificity for the separation of dihydro derivatives, enantiomers and R-S epimers of alkaloids, but low values of the quantitative detection limit are less frequently needed. In terms of methodology, detection methods based on mass spectrometry have become more developed and widespread, but NMR analysis remains in demand because of its high accuracy and specificity. Both rapid methods and liquid chromatography remain in demand in routine practice, with rapid analysis evolving toward higher accuracy owing to improved analytical performance and new equipment. New composite electrochemical sensors (including disposable sensors) have demonstrated potential for real-time process control.

Normal-hexane treatment on PET-based waste fiber depolymerization process

Abstract The global increase in polyethylene terephthalate (PET)-based waste fiber poses a persistent environmental risk. While efforts have been made to repurpose waste fibers into bags, clothing, and building materials, the depolymerization process to extract pure raw materials for recycling remains underdeveloped. This study investigates the impact of normal hexane treatment on the purity of terephthalic acid (TPA) recovered from wastewater containing sodium terephthalate, ethylene glycol, and impurities generated during polyester fabric weight reduction or waste fiber recycling processes. Nuclear magnetic resonance analysis of the recovered TPA (rTPA) revealed a maximum purity of 99.81%, suggesting the effective removal of diverse contaminants such as adhesives and surfactants present in waste fibers through normal hexane and activated carbon treatments. This research contributes to the development of efficient and sustainable PET waste fiber recycling processes, highlighting the potential of normal hexane treatment in enhancing the purity of rTPA.

DATA ANALYSIS FOR THE PREDICTION OF TEXTILE WASTE RECYCLING IN UKRAINE

The textile and sewing industry is known to be the second most environmentally harmful industry for the environment. To maintain a circular economy, textile sources should be recycled, repaired, and used as much as possible while retaining their value. This research provides primary information about the database of post-production textile waste. The data suggests that 30 garment companies produce 778.11 tons of postproduction textile waste per year, with cotton accounting for 42.14% and polyester for 32.45%. It is important to consider processing waste using different technologies according to the certification of textile waste to determine its raw material composition and purity. For an effective waste management policy, it is essential to implement it systematically, continually assess outcomes and challenges, and involve all stakeholders and activities that generate and manage waste. This is crucial in formulating an effective waste management policy.

Toxic Features and Metabolomic Intervention of Glabrene, an Impurity Found in the Pharmaceutical Product of Glabridin.

Glabridin is a widely used product in the cosmetics and pharmaceutical industry, which is generally isolated and purified from Licorice (Glycyrrhiza glabra) extract in industrial production. It has wide clinical applications, but significant toxicity has also been reported. The purity of glabridin raw material is generally between 90% and 98%. We have identified a toxic impurity, glabrene, in the industrial product glabridin. Our investigation using an AB wild-type zebrafish toxicity test showed that glabrene has a significant lethal effect with an LC10 of 2.8 μM. Glabrene induced obvious malformation and disrupted cartilage development in zebrafish larvae. Furthermore, the compound significantly reduced larval mobility and caused damage to brain neural tissues. Metabolic pathway analysis and neurotransmitter quantification via ELISA indicated abnormal activation of the phenylalanine metabolic pathway, resulting in elevated dopamine and acetylcholine levels in vivo. These findings provide insights into the potential risks of glabrene contamination and offer a new reference point for enhancing safety measures and quality controls in licorice-derived products.

PLANT RAW MATERIAL AS A SOURCE OF METABOLITES FOR WOUND HEALING AND ANTI-SCARRING PRODUCT

Cosmeceutical products based on plant raw materials have a complex effect, are available, and low-toxic. The creation of new natural products for wound healing without tissue scarring is topical. For this, the secondary metabolites of the plant must demonstrate antibacterial, anti-inflammatory, and antioxidant effects, and have low cytotoxicity. Aim. To conduct an analysis of literary sources in electronic databases, regarding products on the market with a wound healing effect and plant raw materials that would have a therapeutic effect on wound healing without the formation of scars. Results. The characteristics of four types of scars are described. Plants and secondary metabolites are listed according to their action: antibacterial, antioxidant, anti-inflammatory, collagenstimulating, and anti-scarring. Lupeol, allicin, and cinnamaldehyde show antibacterial effect; quercetin, resveratrol, luteolin, naringenin, gallic acid, and curcumin show antioxidant effect; asiatic acid, pinocembrin, and myricetin show anti-inflammatory effect. Cryptotanshinone, bexarotene, taspine, sesamol, and astragaloside IV contribute to the deposition of fresh collagen in the wound. On the Ukrainian market, there are natural wound healing products in the form of a balm, cream, and gel. They include vegetable oils, essential oils, extracts of Thymus L., Arnica montana, Inula helenium, Aloe vera, Matricaria chamomilla, etc. Wound healing medicinal products of a chemical nature occupy a large part of the Ukrainian market, among them the products with dexapentanol predominate. The use of the cell culture method as an alternative source of plant raw materials for wound and scar treatment is perspective. The biotechnological method helps preserve biodiversity and obtain chemically pure plant raw materials regardless of environmental conditions. Conclusions. The study demonstrates the possibilities of using plant raw materials to create new cosmeceuticals with wound healing and anti-scaring effects for use in combined therapy.

Ultrasonic-assisted nanofiltration separation recovering salvianolic acid B from ethanol wastewater

The transformation of salvianolic acid B brought on by heat treatment recovery of ethanol eluent, which is a difficult problem in pharmaceutical technology, affects the purity of raw material when the medicinal raw material salvianolic acid B is purified by resin. Ultrasonic-assisted nanofiltration separation (UANS) was first employed to improve efficiency of resource utilization by regulating rejection and separating salvianolic acid B and rosmarinic acid from organic pharmaceutical wastewater. The rejection was related to three variables: ultrasonic power, pH, and ethanol concentration. But there were differences in the effects of variables on the rejections of salvianolic acid B and rosmarinic acid. The rejections of rosmarinic acid and salvianolic acid B showed a decreasing trend with an increase in ultrasonic power or a decrease in pH; however, when the concentration of ethanol was increased from 5 % to 35 %, the salvianolic acid B rejection increased from 84.96 % to 96.60 % and the rosmarinic acid rejection decreased from 35.09 % to 17.51 %. On the basis of response surface methodology (RSM), the optimal UANS parameters for solution conditions involving different ethanol concentrations are as follows: 10 % ethanol solution (ultrasonic power 500 W and pH 6.15), 20 % ethanol solution (ultrasonic power 500 W and pH 6.54), and 30 % ethanol solution (ultrasonic power 460 W and pH 6.34). The molecular proportions of salvianolic acid B were 10.75 %, 7.13 %, and 8.27 % in 10 %, 20 %, and 30 % ethanol wastewater, while the molecular proportions of rosmarinic acid were 40.52 %, 33.83 %, and 69.87 %, respectively. And the recoveries of salvianolic acid B in 10 %, 20 %, and 30 % ethanol wastewater were 93.56 %, 95.04 %, and 97.30 %, respectively, while the recoveries of rosmarinic acid were 3.19 %, 2.27 %, and 0.56 %. The molecular proportion and the rejection are correlated exponentially. In comparison with conventional nanofiltration separation (CNS), UANS is able to resolve the conflict between rosmarinic acid and salvianolic acid B in pharmaceutical wastewater, as well as enhance resource recycling and separation efficiency to prevent pollution of the environment from pharmaceutical wastewater. Experiments using UANS at different power intensities suggest that the ultrasonic at a power intensity of 46–50 W/L and the power density of 0.92–1.00 W/cm2 may resolve the separation conflict between rosmarinic acid and salvianolic acid B. This work suggests that UANS may be a significant advancement in the field of ultrasonic separation and has several potential uses in the water treatment industry.

Закономерности в распределении химических элементов в листьях березы

Биологическая активность лекарственного растительного сырья и фитопрепаратов обусловлена комплексом биологически активных веществ и химических элементов. Исследование влияния условий призрастания на состав, содержание химических элементов в лекарственных растениях, лекарственном растительном сырье является актуальным. Особый интерес вызывает исследование закономерностей в распределении химических элементов в лекарственных растениях, лекарственном растительном сырье и возможность использования выявленных закономерностей для установления подлинности и чистоты сырья. Объект нашего исследования — листья березы, собранные в экологически чистой зоне и в зонах с различной степенью антропогенной нагрузки. Состав и содержание элементов анализировали методом ИСП–МС (масс-спектрометр ELAN DRC-е ICP-MS, оптико-эмиссионный спектрометр Agilent 715 ICP–OES). Статистическая обработка результатов химического анализа проведена в программе Microsoft ® Excel 2010. Сопоставление концентраций 60 элементов проводили с применением метода наименьших квадратов. Сравнительный анализ логарифмов концентраций в листьях березы, собранных из мест произрастания, различающихся по степени антропогенной нагрузки, показал сильную корреляционную связь между ними (r=0,99; R2=0,9). Диаграмма, отражающая периодическую зависимость логарифма концентраций химических элементов, представляет собой элементный профиль листьев березы и может быть использована для установления их подлинности и чистоты.

Micromorphology, physicochemical parameters, and phytochemical screening of Chloranthus flavus D.T. Liu & G. Chen (syn. C. nervosus Collett & Hemsl.) from Vietnam

Abstract. Chen TV, Lam DNX, Khai HD, Duc DPN, Nga NT, Hien NTT, Quynh TTT. 2024. Micromorphology, physicochemical parameters, and phytochemical screening of Chloranthus flavus D.T. Liu & G. Chen (syn. C. nervosus Collett & Hemsl.) from Vietnam. Biodiversitas 25: 846-858. Chloranthus flavus D.T. Liu & G. Chen (syn. C. nervosus Collett & Hemsl.) is a subshrub belonging to the family Chloranthaceae. Information on the anatomical structure and the powder features of C. flavus has not been noted. This study aimed to develop a monograph on the microscopic characteristics and physicochemical parameters of C. flavus, as well as a preliminary assessment of the phytochemical composition of this species. Anatomical characterizations of roots, stems, and leaves were performed using the iodine green-carmine staining method and then an optical microscope was used to observe the histology of these parts, similar to observing powder characteristics. Secondary metabolites were detected by chromogenic or precipitation reagents. Anatomically, the structural characteristics of the roots, stems, and leaves are similar to those of the Chloranthus species. Particularly, the root structure is characterized by six alternating xylem bundles, with six phloem bundles forming a ring. Polygonal to irregularly shaped cells of the upper epidermis and irregularly shaped ordinary cells, laterocytic and anomocytic stomata types, stomatal clusters, and the stomatal index (15.75±1.52%) of the lower epidermis were observed in leaves. Both powders found fragments of epidermal and parenchymatous cells, spiral xylem vessels, and scalariform xylem vessels. However, the root powder only observed solid-shaped sclereid cells, starch granules, starch clusters, and calcium oxalate crystals. The powders' moisture content, total ash, and acid-insoluble ash values all meet acceptable standards according to regulations on raw material purity. The whole C. flavus plant contains carotenoids, fatty acids, essential oils, flavonoids, tannins, coumarins, alkaloids, triterpenoids, amino acids, and carbohydrates. The current findings highlight the key characteristics for identifying C. flavus.

The potential of Paeonia lactiflora pall seeds oil as a pure natural cosmetics raw material: InVitro findings.

As a traditional Chinese herbal medicine, Paeonia lactiflora Pall is rich in various active ingredients such as polysaccharides and total flavonoids while having ornamental value. It has potential application value in the development of food and cosmetics. To study the invitro efficacy of Paeonia lactiflora Pall seeds oil. Firstly, the levels of linolenic acid and linoleic acid in Paeonia lactiflora Pall seeds oil were quantified using gas chromatography. The impact of Paeonia lactiflora Pall seeds oil on the proliferation rate of B16F10 cells was assessed through the CCK-8 method, while the melanin content of B16F10 cells was determined using the sodium hydroxide lysis method. The inhibitory effects of Paeonia lactiflora Pall seeds oil on elastase, collagenase and hyaluronidase were evaluated by biochemical techniques invitro. Lastly, the hen's egg chorioallantoic membrane test (HET-CAM) was conducted to confirm the absence of eye irritation caused by Paeonia lactiflora Pall seeds oil. Paeonia lactiflora Pall seeds oil within a certain volume concentration range (0.5%-4%) had no effect on the proliferation of B16F10 cells. Paeonia lactiflora Pall seeds oil showed significant inhibition of elastase, collagenase and hyaluronidase. Notably, the highest concentration tested, 4% Paeonia lactiflora Pall seed oil, yielded the most pronounced outcomes without causing any irritation. A certain concentration of Paeonia lactiflora Pall seeds oil has a significant effect on decreasing the melanin content in B16F10 cells and inhibiting the activities of elastase, collagenase, and hyaluronidase, which can provide a reference for the development of pure natural cosmetics raw materials.

Simultaneous determination of four N-lauryl amino acid surfactants in facial cleansers by high performance liquid chromatography-ultraviolet detection

Significant developments have recently been achieved in the field of N-lauryl amino acid (NLAA) surfactants derived from renewable resources. Compared with conventional surfactants, NLAAs exhibit remarkable surfactant properties, exceptional biodegradability, good biocompatibility, and high safety profiles. These attributes have led to the widespread use of NLAAs in personal-care products. The detection methods employed for NLAAs include two-phase titration (TT), spectrophotometric analysis (SA), and high performance liquid chromatography (HPLC). However, because both TT and SA measure the total concentration of anionic active matter, identifying and quantifying individual compounds in a sample containing multiple anionic surfactants is impossible. The presence of cationic surfactants in the sample also introduces interferences, which lead to significant errors. Compared with TT and SA, HPLC offers direct and rapid testing procedures. However, compounds with no or weak UV-visible light absorption exhibit low sensitivity when detected by UV, necessitating the use of detectors such as differential refractive index detectors (RIDs), evaporative light scattering detectors (ELSDs), or charged aerosol detectors (CADs). Most HPLC users consider UV light as the fundamental configuration of the instrument, and other detectors are less commonly employed. Therefore, establishing a new HPLC method suitable for the UV detection of NLAAs is of practical significance. In this study, a novel HPLC-UV method was developed for the simultaneous detection of N-lauryl glutamine (LG), N-lauryl glycine (LC), N-lauryl alanine (LA), and N-lauryl sarcosine (LS) by optimizing the mobile-phase composition and selecting an appropriate chromatographic column and detection wavelength. The samples were mixed with acetonitrile-0.10% H3PO4 aqueous solution (60∶40, v/v) and sonicated for 10 min, then stayed at room temperature for 5 min. Subsequently, the mixture was filtered through a 0.22 μm filter membrane and separated on an Agilent Eclipse Plus C18 column (150 mm×4.6 mm, 5 μm). The mobile phase used for separation consisted of acetonitrile-0.10% H3PO4 aqueous solution at a flow rate of 1.0 mL/min. The detection wavelength was set at 205 nm, and the injection volume was 10 μL. The results demonstrated that the four NLAAs exhibited good linearity in the range of 2.0-800.0 mg/L, with correlation coefficients (r)≥0.9995. The limits of detection (LODs) ranged from 0.17 to 0.49 mg/L, and limits of quantification (LOQs) ranged from 0.57 to 1.63 mg/L. The relative standard deviations (RSDs) for precision, repeatability, and stability over 24 h were all below 2.0%. Using this method, the NLAA contents of five facial-cleanser products were determined. The results demonstrated that all five samples contained one or more NLAAs, and the total NLAA contents ranged from 64.58 to 97.01 mg/g. The five spiked-sample recoveries of the NLAAs at four different spiked levels (0.60, 4.50, 15.00, 24.00 mg/g) ranged from 94.3% to 107.4%, indicating satisfactory accuracy. However, the actual NLAA composition and label for one facial-cleanser product were not consistent with our test results. This finding demonstrates the necessity of strengthening market monitoring through testing. The proposed method has the advantages of simple pretreatment, rapid testing, good precision, high accuracy, and appropriate stability. Thus, it is suitable for the determination of NLAA contents in facial cleansers and provides an effective technical reference for the raw-material purity assessment, synthetic yield detection, and product quality control of this type of surfactant.

Effect of industrial grade raw materials and its associated impurities on first hydrogenation of BCC solid solution alloys

This study explores the effects of using industrial-grade raw materials on the hydrogen storage properties of body-centered cubic (BCC) solid solution alloys. Industrial scrap metals were chosen as the raw material, and the desired alloys were synthesized using a vacuum arc melting furnace. Instead of using pure vanadium (V), different inexpensive industrial substitutes such as low-grade vanadium (V), vanadium nitride (VN), vanadium oxide (VO), and ferrovanadium (FeV) were utilized. The crystal structure, morphology, first hydrogenation, thermodynamics, and cyclability of the prepared alloys were analyzed by using XRD, SEM-EDS, and XPS methods. The crystal structure and morphology analysis revealed multiphase alloys in all the prepared alloys and a Ti rich third phase in the VN sample, which was absent otherwise. The first hydrogenation was performed at room temperature under a hydrogen pressure of 2 MPa without any prior heat treatment. The VO alloy displayed negligible hydrogen absorption during first hydrogenation, while the V, VN, and FeV alloys showed maximum hydrogen storage capacities of 3.49 wt%, 2.47 wt%, and 2.18 wt%, respectively. The presence of oxygen hinders the activation of the VO alloy and requires two activation cycles to activate the sample. A short-term cyclability analysis showed a reversible hydrogen storage capacity of 2 wt%. The change in enthalpy of hydrogen absorption and desorption for V alloy were calculated to be −36.73 ± 8.6 and 57.34 ± 8.3 kJ/mol H2, respectively. One of the prominent advantages of utilizing scrap raw materials was the substantial reduction in overall raw material costs, which saw an impressive 95% decrease when compared to using pure raw materials. These results highlight the economic benefits of incorporating recovered industrial scrap into hydrogen storage alloys.

Application of X-ray Fluorescence and Radiation Methods for the Analysis of Medicinal Plant Raw Materials on the Example of <i>Achilleae millefolii herba</i>

Introduction. Environmental monitoring is an important area of modern scientific research. This is due to the anthropogenic impact on the environment, which often negatively affects the diversity of the Russian medicinal flora. The use of modern instrumental analytical methods of medicinal plant raw materials is relevant due to the intensive development of science. The content of heavy metals, the elemental composition and the level of background radiation are important characteristics of ecological purity and safety of medicinal plant raw materials. These characteristics are of interest for assessing the possibility of harvesting and using medicinal plants at localization. The generally accepted instructions for harvesting were used.Aim. Investigation of the possibilities of using X-ray fluorescence and radiation methods for environmental monitoring of medicinal plant raw materials.Materials and methods. The research object was Achilleae millefolii herba. The harvestment of plant raw materials was carried out in the Bardymsky, Chernushinsky, Uinsky, Kishertsky, Oktyabrsky, Suksunsky, Ordinsky, Sivinsky districts of the Perm Region in the summer in 2022–2023. The X-ray fluorescence analyzer (XFA) ARL QUANT'X EDXRF was used to determine heavy metals and assess the elemental composition of plants. The analysis was carried out according to the methodology that was developed by scientists of the Pharmacognosy Department at the Perm State Pharmaceutical Academy. The radiation background in raw materials was assessed by using a special dosimeter RADEX RD1503.Results and discussion. As a result, it was found that harvesting of Achilleae millefolii herba is possible in the Perm Region studied areas. Bardymsky, Uinsky, Kishertsky, Ordinsky, Chernushinsky districts are the most recommended for harvesting plant raw materials. Samples from these areas are ecological purity and safe for use as medicinal raw materials and have a diverse elemental composition. The content of heavy metals does not exceed the maximum permissible concentrations according to the regulatory documentation requirements. The background radiation level does not exceed the threshold value compared to other areas in the Russian Federation.Conclusion. X-ray fluorescence analysis is a suitable and reliable analytical method for determining elements in plant raw materials. XFA is a multi-element express method that allows analyzing a sample with minimal sample preparation. The advantages of the method are good reproducibility, high sensitivity, and efficiency. Research continues.

Solid-core anti-resonant fiber based on silicate glass

A silicate-glass-based solid-core anti-resonant fiber was fabricated by drilling and rod-in-tube method in this work. The fiber with a core diameter of 37.5 μm exhibited confinement loss of 1.33 dB/m at the anti-resonant wavelength of 1812.5 nm when subtracting the glass material loss. The laser at 1812.5 nm showed a beam quality with M2 factor of 1.56 after propagating in the anti-resonant fiber with a length of 0.3 m. Future improvement of raw material purity and optimization of fiber uniformity would promote the fiber transmission performance to extend its practical applications in high-power fiber laser and novel fiber device development.

The influence of the glass phase of fused refractories on their operational and technological properties

The properties of the glass phase of fused refractories containing 28‒94 % ZrO2 are given. The influence of the glass phase composition on the main performance properties of refractories ― corrosion resistance and tendency to release defects is considered. It is shown that a decrease in the amount of glass phase in fused baddeleyite-corundum refractories with a simultaneous increase in the amount of ZrO2 leads to an increase in their corrosion resistance and complication of the annealing conditions of products. The properties of the glass phase, which determine the tendency of refractories to release defects, depend mainly on the SiO2 : Na2O, the purity of raw materials and the method of melting the charge. Oxidative melting with the treatment of the melt with an oxygen-gas mixture is a prerequisite for the formation of a refractory glass phase in refractories and the production of products with a low tendency to the release of defects.

Investigation into the possibility of intensifying the sintering of pure magnesia raw materials

The influence of additives of different nature on grinding, compressibility and sintering of calcined magnesite was investigated. It was found that the investigated recycled additives, when introduced in the amount of up to 0,5 wt. %, do not significantly change the grain composition of calcined periclase after grinding, do not effect the compressibility of powders, do not change their chemical and phase composition after firing up to the temperature of 1870 оC. An additive based on dust-like waste of titanium production enables increasing the density of the obtained briquette by 1,0‒3,5 % or reducing the briquette firing temperature by 50‒100 °С.

Composition and physico-chemical properties of aqueous extracts of lydites of the North Onega synclinorium in Karelia

Relevance. The need to obtain reliable information on chemical composition of aqueous extracts of lydites. There is lack of such information, but it is so important both for understanding dispersion of elements and their impact on natural waters of a region. It is necessary to study the composition of aqueous extracts as a result of water–rock interaction to determine possible sources of water pollution with toxic elements. Mineral composition of lydites of the North Onega synclinorium contains organic carbon and mist pyrite, which may contain increased concentrations of trace elements "harmful" for drinking water. To determine the ability of such elements to pass into a dissolved state, it is necessary to study aqueous extracts of lydites. Aim. To determine trace element composition and physico-chemical properties of aqueous extracts of lydites selected from two districts of the North Onega synclinorium to assess their environmental hazard. Objects. Geological section of the shungite-lidite-dolomite complex of the Zaonezhskaya formation of the Paleoproterozoic age of the North Onega synclinorium. Samples of lidites were taken at the Tetyugino (LT) and Shunga (LSh) sites of the Medvezhyegorsk district of the Republic of Karelia. Methods. Field studies, including investigation of stratigraphic position of lydites in geological sections of the Tetyugino and Shunga sites and sampling, laboratory experiment, aqueous extraction, scanning electron microscopy, Raman spectroscopy, X-ray fluorescence analysis, Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Results. Mineralogical composition of the lydites of both sites is similar. Taking into account high content of SiO2 and negligible content of other petrogenic oxides in chemical composition of lydites, it is possible to consider them as a source for obtaining pure quartz raw materials. The structure of lydites is clot-cryptocrystalline and clot-globular. Lydite extracts environment acidity depends on the totality of the minerals extracted from it, either basic (dolomite) or acidic (pyrite oxidation products). This factor is decisive in formation of chemical composition of lydite extracts, regardless of the location of the samples within a given geological object. Many elements extracted by water from the lydite samples of two regions under consideration are characterized by varying degrees of their extraction from the massive and veined parts of the sample. The cure coefficients of chemical elements in the form of the ratio of element average concentrations in the extract and lydite solid phase show the predominant intake of Cd, Mn, Mo, Sr, Rb, Li, Ni, Co, Li from Tetyugino lydites into water. Mo, Sb and W are predominantly extracted into the solution from the Shunga lydites. Average concentrations of most elements of the extracts of the Shunga samples satisfy the requirements for drinking water and, unlike shungite, they are not sources of harmful components in water. Therefore, it is advisable to carry out work on the possibility of their use for water purification for drinking purposes.

Influence of raw material purity on microstructure and properties of calcia refractory

Influence of raw material purity on microstructure and properties of calcia refractory

A comparative study on nanocrystalline soft magnetic Fe-Si-B-Nb-Cu alloys made of pure elements and ferro-alloys

In the present study, we report a cost-effective method of flux-shielded air induction melting using commercial grade master alloys to produce nanocrystalline soft magnetic Fe73.5Si13.5B9Nb3Cu1 alloy. For comparison, the alloy was made from highly pure raw materials as well. The structure and soft magnetic properties of the commercial grade alloy is similar to the pure one. Air induction melting process with flux not only removed impurities through chemical reactions, it also provided protection from oxidation. Studies of glass formation through experimental findings and Glass Forming Ability (GFA) calculations through ΔT value, α-parameter and PHSS parameter and studies using Calphad (Calculation of Phase Diagram) method have shown that the impurities present in the commercial grade alloy did not affect the glass formation compared to the pure grade alloy. Impurities present in the commercial grade alloy increase the activation energy of crystallization of Fe3Si phase, which in turn influences the volume fraction and grain size of Fe3Si phase during annealing treatment. Amorphous phase TC was found to decrease due to the impurities present in the amorphous phase and this decreased exchange interaction between Fe-Fe atoms. Saturation magnetization and coercivity of commercial grade alloy are almost equivalent to the alloys prepared with pure elements and they are independent of type and concentration of impurities. Lowest coercivity in commercial grade alloy can be achieved in less annealing time which can lead to increase the productivity and reduce the cost further.

Green Synthesis of Mono, Bis and Tris Aminobenzochromenes and Benzopyranochromenes using Fe3O4@Sio2@ Vanillin/Vitamin B1 Nanoparticles: A New, Mild, Simple and Effective Bronsted Acid Catalyst for the Synthesis of Chromenes.

Vanillin/Vitamin B1 (Thiamine) supported Fe3O4@Sio2 nanoparticles (Fe3O4 @SP@VT) were synthesized and thoroughly analyzed, and were used for the green and efficient synthesis of chromenes using the multicomponent reaction of aldehyde, malononitrile and 4-hydroxy coumarin, as well as the multicomponent reaction of aldehyde, α-naphthol or β-naphthol and 4-hydroxy coumarin. The reaction was performed under grinding conditions, and at the end of the reaction, the catalyst was separated in the presence of a strong magnet and can be recovered 10 times. The advantages of this method are high purity of products, short times, higher yield, easy separation and cheap raw materials. We have developed Fe3O4@SP@VT catalyzed multicomponent synthesis of aminobenzochromenes using the reaction of benzaldehyde, malononitrile and naphthol and multicomponent synthesis of benzopyranochromenes using benzaldehyde, 4-hydroxycoumarin and β-naphthol under grind technique.

Eliminating carbon contamination with improved one-step electrochemical preparation of refractory high-entropy alloy TiZrHfNbTa

Creating refractory high-entropy alloys (RHEAs) effectively without impurities is a momentous challenge. Conventional methods for the preparation of RHEAs have exacting requirements for raw material purity and energy consumption. Molten salt electrolytic oxides are applied to the preparation of HEAs by virtue of their low cost and high efficiency. However, the use of graphite anodes in electrolysis will result in the carbon contamination of the products due to the deposition of CO32− at the cathode. Increasing the reaction temperature accelerates the deoxidation of the oxide, thus reducing the amount of carbide but not eliminating it. Switching HfH2 instead of HfO2 and using Nb2O5 to shield the precursor can effectively remove carbon contamination. However, this leads to a complicated preparation process and energy waste. Herein, we use the solid oxygen ion-conducting membrane (SOM) containing graphite and Sn (named as SOM@C/Sn) anode to separate the carbon from the molten salt and prevent the circulation of CO32−. The pure single-phase TiZrHfNbTa RHEA can be produced in only one-step with the SOM@C/Sn anode, which completely solves the problem of carbon contamination in the molten salt electrolysis preparation of HEAs. This work provides a feasible solution for the preparation of novel complex alloys such as carbon-free RHEAs in a low-cost short process.