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Ceylon cinnamon and clove essential oils as promising free radical scavengers for skin care products 锡兰肉桂和丁香精油作为有前途的自由基清除皮肤护理产品
IF 0.8
Acta Chimica Slovaca Pub Date : 2022-01-01 DOI: 10.2478/acs-2022-0001
Silvia Martiniaková, A. Ácsová, J. Hojerová, Zuzana Krepsová, František Kreps
{"title":"Ceylon cinnamon and clove essential oils as promising free radical scavengers for skin care products","authors":"Silvia Martiniaková, A. Ácsová, J. Hojerová, Zuzana Krepsová, František Kreps","doi":"10.2478/acs-2022-0001","DOIUrl":"https://doi.org/10.2478/acs-2022-0001","url":null,"abstract":"Abstract Due to adverse effects of free radicals on human skin and increasing consumer demand for natural ingredients, essential oils from basil, Ceylon cinnamon bark, clove, juniper, lavender, oregano, rosemary, tea tree, thyme, and ylang-ylang were assessed for their antiradical activity. The oils were evaluated in the concentration range of 5—0.1 mg·mL−1, in which the three reference synthetic antioxidants are most often added to mass-produced cosmetics. Among all examined samples, C. cinnamon oil at a concentration of 5 mg·mL−1 showed the strongest DPPH radical scavenging activity (0.41 mg·mL−1 IC50), followed by clove oil, BHA, α-tocopherol, and BHT (0.82, 0.84, 0.88 and 0.93 mg·mL−1 IC50), respectively. At the same concentration, the reduction power of C. cinnamon oil was higher (1.64 mg·mL−1 Trolox Eq.) than that of α-tocopherol and BHT (1.42 and 0.80 mmol·L−1 Trolox Eq., respectively) but lower than that of BHA (1.81 mmol·L–1 Trolox Eq.). Antiradical activity of the other eight essential oils was low or negligible. C. cinnamon oil and clove oil are promising antiradical agents for skin care but according to our GC-MS analysis, these oils contain 0.29 % of cinnamaldehyde, 0.03 % of linalool, 0.02 % of D-limonene, and 0.02 % of eugenol or 0.41 % of eugenol and 0.002 % of linalool, respectively, which are monitored contact allergens in cosmetics. Such a product is not be suitable for consumers allergic to these substances but for the vast majority of consumers it does not pose a risk in terms of allergic manifestations.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"15 1","pages":"1 - 11"},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44334038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Alachlor — ecotoxicity of ozonation by-products 甲草胺——臭氧氧化副产物的生态毒性
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0010
Oľga Čižmárová, Ronald Zakhar, J. Derco
{"title":"Alachlor — ecotoxicity of ozonation by-products","authors":"Oľga Čižmárová, Ronald Zakhar, J. Derco","doi":"10.2478/acs-2021-0010","DOIUrl":"https://doi.org/10.2478/acs-2021-0010","url":null,"abstract":"Abstract This work focuses on the assessment of alachlor toxicity, its impact on aquatic and terrestrial ecosystems, non-target organisms, and humans, as well as with pesticide legislation in the European Union and Slovakia. In the experimental part, the pesticide alachlor was degraded by various ozone-based processes. Toxicity of the original substance and its degradation products was evaluated by ecotoxicity tests on white mustard and bulb onion. Respirometric measurements were performed to assess their effect on the microorganisms of activated sludge process. From the results it is possible to evaluate that the degradation of alachlor by ozonation at alkaline pH resulted in less toxic substances compared to the original pesticide.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"79 - 85"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43628228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Nanostructured catalysts for BIOEthanol transformation to industrially important chemicals 生物乙醇转化为工业重要化学品的纳米结构催化剂
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0009
B. Horváth, M. Petrík, Dana Gašparovičová, T. Soták
{"title":"Nanostructured catalysts for BIOEthanol transformation to industrially important chemicals","authors":"B. Horváth, M. Petrík, Dana Gašparovičová, T. Soták","doi":"10.2478/acs-2021-0009","DOIUrl":"https://doi.org/10.2478/acs-2021-0009","url":null,"abstract":"Abstract Utilization of a low-cost biomaterial, such as bioethanol, to produce value–added compounds for current industry has been investigated. This work is focused on the catalytic transformation of bioethanol into industrially significant alkenes. Catalytic transformation of ethanol was studied using catalysts based mainly on nanostructured materials as Mg-Al hydrotalcites, sepiolites and zeolites doped with Cu, K, Sr, Zn and Mn. The catalytic tests were carried out in a plug-flow reactor in the temperature range of 350—550 °C. Undoped zeolites promote acid-catalyzed dehydration of ethanol, while in case of basic catalysts, such as hydrotalcites, the product distribution is shifted toward butadiene. The impact of the hydrotalcites preparation method on their structure and catalytic activity is reported. It was found that hydrotalcite with well-developed layered structure, prepared by slow hydrolysis, promotes the formation of butadiene (with butadiene yield of 28.2 % at 400 °C vs. ethylene yield of 17.2 % at 550 °C).","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"66 - 78"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48053899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical study of lumichrome, 1-methyl-lumichrome and lumiflavin binding ability with thymine 荧光色素、1-甲基荧光色素及荧光黄素与胸腺嘧啶结合能力的理论研究
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0002
D. Cagardová, M. Michalík, Vladimír Lukes
{"title":"Theoretical study of lumichrome, 1-methyl-lumichrome and lumiflavin binding ability with thymine","authors":"D. Cagardová, M. Michalík, Vladimír Lukes","doi":"10.2478/acs-2021-0002","DOIUrl":"https://doi.org/10.2478/acs-2021-0002","url":null,"abstract":"Abstract Gas-phase geometry and electronic structure of lumichrome, 1-methyl-lumichrome and lumiflavin in the electronic ground state and their excited states were investigated using the Density Functional Theory. Their binding ability with thymine was estimated for model van der Waals dimers with two intermolecular hydrogen bonds. The influence of hydrogen bonds on their photophysical properties was analyzed. Obtained theoretical data were compared with available experimental absorption and fluorescence spectra.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"7 - 13"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45805146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum-chemical studies of rutile nanoparticles toxicity II. Comparison of B3LYP and PM6 data 金红石纳米颗粒毒性的量子化学研究II。B3LYP与PM6数据的比较
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0006
M. Breza
{"title":"Quantum-chemical studies of rutile nanoparticles toxicity II. Comparison of B3LYP and PM6 data","authors":"M. Breza","doi":"10.2478/acs-2021-0006","DOIUrl":"https://doi.org/10.2478/acs-2021-0006","url":null,"abstract":"Abstract The relation between copper atomic charges and metal-ligand interaction energies obtained by PM6 and DFT-B3LYP methods for cytotoxicity prediction of model rutile nanoparticles [Ti40O124H81]7–, [Ti7O28H26]2–, [Ti2O10H10]2–, [Ti7O30H30]2– and their Cu(II) complexes is investigated. Except for Mulliken charges, very good statistical parameters were obtained for the linear relation between the results obtained by both methods if standard accuracy of quantum-chemical calculations is achieved.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"38 - 50"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45134290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Thermodynamic prediction of proton and hydrogen atom abstraction in dehydroascorbic acid and its bicyclic form 脱氢抗坏血酸及其双环形式中质子和氢原子提取的热力学预测
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0005
Dagmar Štellerová, Vladimír Lukes
{"title":"Thermodynamic prediction of proton and hydrogen atom abstraction in dehydroascorbic acid and its bicyclic form","authors":"Dagmar Štellerová, Vladimír Lukes","doi":"10.2478/acs-2021-0005","DOIUrl":"https://doi.org/10.2478/acs-2021-0005","url":null,"abstract":"Abstract Conformation analysis of dehydroascorbic acid and its bicyclic form was performed using the density functional theory. For the energetically preferred conformations, ionization potentials (IP) and bond dissociation enthalpies (BDE) were calculated using the B3LYP functional and 6-311++G** basis set. The effects of aqueous solution were estimated using the solvation model based on density (SMD) and the polarizable continuum model (IEF-PCM). The obtained results were compared with available experimental data for reference L-ascorbic acid (vitamin C). Our calculations indicate that the investigated bicyclic metabolic product of vitamin C can also exhibit limited radical scavenging ability due to the thermodynamically preferred dissociation of tertiary —CH bonds.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"32 - 37"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42376038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Predictive control of a cascade of biochemical reactors 级联生化反应器的预测控制
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0007
M. Mojto, M. Horváthová, Karol Kiš, M. Furka, M. Bakosová
{"title":"Predictive control of a cascade of biochemical reactors","authors":"M. Mojto, M. Horváthová, Karol Kiš, M. Furka, M. Bakosová","doi":"10.2478/acs-2021-0007","DOIUrl":"https://doi.org/10.2478/acs-2021-0007","url":null,"abstract":"Abstract Rapid growth of the human population has led to various problems, such as massive overload of wastewater treatment plants. Therefore, optimal control of these plants is a relevant subject. This contribution analyses control of a cascade of ten biochemical reactors using simulation results with the aim to design optimal and predictive control strategies and to compare the achieved control performance. The plant represents a complicated process with many variables involved in the model structure, reduced to the single-input and single-output system. The first implemented approach is linear offset-free model predictive control which provides the optimal input trajectory minimising a quadratic cost function. The second control strategy is robust model predictive control with similar features as model predictive control but including the uncertainty of the process. The final approach is generalised predictive control, mostly used in the industry because of its simple structure and sufficiently good control performance. All considered predictive controllers provide satisfactory control performance and remove the steady-state control error despite the constrained control inputs.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"51 - 59"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48808896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A simple theoretical approach to converging of Myoglobin-Assay with different pH values 一个简单的理论方法，以收敛肌红蛋白测定与不同的pH值
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0012
Özgehan Cansu Gülcü, E. Üstün
{"title":"A simple theoretical approach to converging of Myoglobin-Assay with different pH values","authors":"Özgehan Cansu Gülcü, E. Üstün","doi":"10.2478/acs-2021-0012","DOIUrl":"https://doi.org/10.2478/acs-2021-0012","url":null,"abstract":"Abstract Many metal carbonyl complexes have been synthesized and analyzed as CO-releasing agents. As in many bioactivity assays, differences between in-vitro and in-vivo studies in Myoglobin Assay have been observed. Adjustment of in-vitro conditions to in-vivo conditions is one way to overcoming this problem. Changing the conditions of each in-vivo assay is not possible considering the available grant, material, and labor facilities. In-silico methods are suitable as they provide better in-vitro conditions before experimental procedures. A method which is easy to employ on a basic computer could be more suitable to observe the assay convergence. In this study, global reactivity descriptors were used as an approach to investigate pH differences in myoglobin assay. Global reactivity descriptors of the molecules were compared with myoglobin assay results at different pH values and molecular docking results performed with optimized molecules in different solvents. The following complexes were studied: [Mn(CO)3(bpy)(L)]PF6 (bpy: 2,2-bipyridyl, L: benzylbenzimidazole, 4-chlorobenzylbenzimidazole).","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"97 - 104"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43041909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of ambient parameters change on mint leaves solar drying 环境参数变化对薄荷叶日光干燥的影响
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0003
A. Noori, Mohammad Jafar Royen, J. Haydary
{"title":"Effect of ambient parameters change on mint leaves solar drying","authors":"A. Noori, Mohammad Jafar Royen, J. Haydary","doi":"10.2478/acs-2021-0003","DOIUrl":"https://doi.org/10.2478/acs-2021-0003","url":null,"abstract":"Abstract This study investigates the effect of ambient conditions change on mint leaves solar drying performance and product water activity. Two drying methods, active indirect solar drying (AISD) and open sun drying (OSD) were compared while the experiments were carried out at specific dry climate conditions. During the experimental days, temperature varied from 20 to 30 °C, air relative humidity from 14 to 28.8 % and ambient pressure was around 82 kPa. The effect of air relative humidity change during the day on the rehydration of the product during the drying process was observed. After 7 h of drying, moisture content of mint leaves decreased from 85.29 % to 5.38 % in the AISD and 7.42 % in the OSD system. The 0.97 initial water activity decreased to 0.195 in AISD and 0.79 in OSD. Rehydration during the evening hours caused an increase in product water activity from 0.2 to 0.51. Changes of ambient conditions such as temperature and air relative humidity during the day can significantly affect water activity of dried product due to its rehydration and thus increase the risk of product spoilage.","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"14 - 24"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49619935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Identification of corrosion products on iron artefact from Bratislava castle 布拉迪斯拉发城堡铁制品腐蚀产物的鉴定
IF 0.8
Acta Chimica Slovaca Pub Date : 2021-01-01 DOI: 10.2478/acs-2021-0001
R. Košťúr, M. Zemanová
{"title":"Identification of corrosion products on iron artefact from Bratislava castle","authors":"R. Košťúr, M. Zemanová","doi":"10.2478/acs-2021-0001","DOIUrl":"https://doi.org/10.2478/acs-2021-0001","url":null,"abstract":"Abstract Corrosion layers of an iron artefact were characterized to study long-term exposition of iron in Slovakia. The iron artefact from Bratislava castle has been coated with a strong layer of corrosion products and masonry residues. Corrosion products were characterized by different methods including energy-dispersive X-ray spectroscopy (EDX), X-Ray diffraction (XRD), and µ-Raman Spectroscopy. Magnetite and goethite on the surface are confirmed typical corrosion products from long-term atmospheric exposure in environment with corrosivity category C-2 (low).","PeriodicalId":7088,"journal":{"name":"Acta Chimica Slovaca","volume":"14 1","pages":"1 - 6"},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42446661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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