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Macedonian Journal of Chemistry and Chemical Engineering最新文献

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Elementary, my dear Watson! The making of a collection of the natural elements 很简单，我亲爱的华生!自然元素的集合
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-06-21 DOI: 10.20450/mjcce.2022.2518
M. Najdoski, Z. Zdravkovski
{"title":"Elementary, my dear Watson! The making of a collection of the natural elements","authors":"M. Najdoski, Z. Zdravkovski","doi":"10.20450/mjcce.2022.2518","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2518","url":null,"abstract":"A unique collection of samples of the chemical elements has been created and displayed at our Institute of Chemistry. Although whole collections are now commercially available, we decided to use, as much as possible, samples from local resources. The general idea was for each item to have a story, making it more interesting for the students and visitors. We were able to acquire elemental samples mined in Macedonia. Other samples were from our student and research labs, as well as donations from colleagues, and the rest were obtained from commercial sources. A web page was created with all the information on each sample, some of them containing videos. Next to the noble gases, mini Tesla coils were mounted to light up the gases.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41656385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of microwave-assisted extraction of phenolic compounds from Inula britannica L. using the Box-Behnken design Box-Behnken设计优化微波辅助提取不列颠菊酚类化合物
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-06-21 DOI: 10.20450/mjcce.2022.2483
V. Ivanova, A. Trendafilova
{"title":"Optimization of microwave-assisted extraction of phenolic compounds from Inula britannica L. using the Box-Behnken design","authors":"V. Ivanova, A. Trendafilova","doi":"10.20450/mjcce.2022.2483","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2483","url":null,"abstract":"A closed-vessel microwave-assisted extraction (MAE) of phenolic compounds from the aerial parts of Inula britannica L. using single-factor experiments and the Box-Behnken design with four independent variables (liquid-to-solid ratio, ethanol concentration, extraction time, and temperature) was investigated. The ANOVA results showed that the obtained model was significant at a 95 % confidence level. The extraction parameters for the maximal total phenolic content (46.19 mg GAE/g DM) were determined to be 15.13 ml/g liquid-to-solid ratio, 55.95 % EtOH, 73.74 ºC, and 5.73 min. Compared with classical maceration, the proposed MAE of phenolic compounds from I. britannica saves a lot of time and gives a high extraction yield.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49630641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Establishing mass spectral fragmentation patterns for characterization of 1,2 -unsaturated pyrrolizidine alkaloids and N-oxides in Boraginaceae species from Macedonia using LC-ESI-MS/MS 采用LC-ESI-MS/MS建立马其顿Boraginaceae植物中1,2 -不饱和吡咯里嗪类生物碱和n -氧化物的质谱破碎图谱
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-06-20 DOI: 10.20450/mjcce.2022.2491
J. Petreska Stanoeva, Elena Stefova, Marinela Cvetanoska, J. Bogdanov
{"title":"Establishing mass spectral fragmentation patterns for characterization of 1,2 -unsaturated pyrrolizidine alkaloids and N-oxides in Boraginaceae species from Macedonia using LC-ESI-MS/MS","authors":"J. Petreska Stanoeva, Elena Stefova, Marinela Cvetanoska, J. Bogdanov","doi":"10.20450/mjcce.2022.2491","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2491","url":null,"abstract":"Pyrrolizidine alkaloids (PAs) are secondary plant metabolites, and their 1,2-unsaturated derivatives, which contain the retronecine, heliotridine, or otonecine type of the necine base, have raised concern due to their ability to form hepatotoxic intermediates and exhibit serious toxic effects. Several hundred individual pyrrolizidine alkaloids and their N-oxides have been identified mostly using liquid chromatography coupled with mass spectrometry, although the number of available reference standards is limited.\u0000In this work, characteristic fragment ions and their abundance in the mass spectra of different PAs were used to reveal typical fragmentation patterns for various classes of PAs that can be further employed to distinguish monoesters (retronecine, heliotridine type), open chain diesters and macrocyclic diesters, and corresponding N-oxides.\u0000Fragment ions at m/z 120 and 138 were found in all types of PAs with a different relative abundance. Additional observation of fragment ions at m/z 94 and 156 was found to be typical for monoester PAs esterified at position C9 of the necin base, whereas fragment ions at m/z 111 and 172 were characteristic for monoester N-oxides. Fragment ions at m/z 180 and 220 were found to be typical for open chain diesters with esterification at C7 with acetic and angelic acid, respectively, whereas fragment ions at m/z 214 and 254 were characteristic for the respective N-oxides. For the 3ʹ-acetyl PA monoester or open chain diester derivatives, characteristic fragment ions were observed after loss of the acetyl moiety ([M+H]+–60), whereas for macrocyclic diesters and their N-oxides, fragment ions due to the neutral loss of CO were found ([M+H]+–28).","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42192915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Selenium-functionalized cyclic ethers derived from natural terpenic alcohols – biological in vitro profile 天然萜烯醇衍生的硒官能化环醚——体外生物学特性
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-06-12 DOI: 10.20450/mjcce.2022.2499
Kristina Mihajlović, V. Divac, M. Kostić, M. Zivanovic, Jelica Grujić, Katarina Virijević
{"title":"Selenium-functionalized cyclic ethers derived from natural terpenic alcohols – biological in vitro profile","authors":"Kristina Mihajlović, V. Divac, M. Kostić, M. Zivanovic, Jelica Grujić, Katarina Virijević","doi":"10.20450/mjcce.2022.2499","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2499","url":null,"abstract":"Terpenic alcohols linalool, nerolidol and α-terpineol were subjected to the PhSe-induced cyclization, where corresponding cyclic ethers were obtained. The heterocyclic product derived from α-terpineol is a derivate of the natural product eucalyptol, while linalool cyclization produces precursors of the natural product karahanaenone. All three cyclic ether products have an organoselenium moiety in the side chain, which can represent a significant source of bioactivities. Biological evaluation of obtained products, in vitro cytotoxicity and redox status parameters, was performed on two model systems: HCT-116 – immortalized colon cancer cell line, and MRC-5 – healthy fibroblasts isolated from lung pleura. The results indicate a strong prooxidative character of all compounds on colon cancer HCT-116 and healthy MRC-5 cells in the highest applied concentrations. Selectivity towards cancer cells was not observed, except when nerolidol-derived product was used for longer exposure time. A biological evaluation was conducted to establish the quantitative relationship between enhanced radical species formation and cell viability.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44474403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of the extraction of antioxidants from stinging nettle leaf using response surface methodology 响应面法优化刺荨麻叶中抗氧化剂的提取工艺
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-05-30 DOI: 10.20450/mjcce.2022.2238
Una-Jovana Vajić, J. Živković, M. Ivanov, D. Jovović, K. Šavikin, B. Bugarski, N. Mihailović-Stanojević
{"title":"Optimization of the extraction of antioxidants from stinging nettle leaf using response surface methodology","authors":"Una-Jovana Vajić, J. Živković, M. Ivanov, D. Jovović, K. Šavikin, B. Bugarski, N. Mihailović-Stanojević","doi":"10.20450/mjcce.2022.2238","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2238","url":null,"abstract":"The aim of this study was to optimize the parameters of the extraction of total flavonoids from stinging nettle leaf. Comparison of the effects of different solvents on total flavonoid content showed that, regardless of extraction time, aqueous-methanolic extracts had higher total flavonoid content than aqueous-ethanolic extracts. So, full factorial design and response surface methodology (RSM) were employed to estimate the effects of methanol content (50, 75, and 100 %) and extraction time (30, 60, and 90 minutes) on total flavonoid content and antioxidant capacities of the extracts. RSM analysis showed that methanol content in the solvent influenced significantly total flavonoid content and FRAP (Ferric Reducing Antioxidant Power Assay) antioxidant capacity, while extraction time had no significant effect on either of the responses. Extraction parameters for maximal total flavonoid content were estimated to be 69 % aqueous-methanol and 67 min, and 65 % aqueous-methanol and 83 min for maximal FRAP antioxidant capacity. DPPH (2,2-diphenyl-1-picrylhydrazyl) antioxidant capacity was not significantly affected by extraction time or methanol percentage in the solvent.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49514165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
How long would evidence of an extraterrestrial visit survive: an educational exercise 外星人造访的证据能存活多久：一项教育演习
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-05-27 DOI: 10.20450/mjcce.2022.2502
J. Trefil
{"title":"How long would evidence of an extraterrestrial visit survive: an educational exercise","authors":"J. Trefil","doi":"10.20450/mjcce.2022.2502","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2502","url":null,"abstract":"With the discovery of objects entering the solar system from interstellar environments, the discussion of the possibility of extraterrestrial visitors to Earth has resumed. We examine the question of how long the evidence for such visits could be expected to last on Earth and on the Moon. Using geological estimates and our current knowledge of the lunar regolith, we conclude that evidence for visits to Earth more than 100,000 years ago would not survive to the present. Radiocarbon dating of some organic material (assuming large C-14 abundance) is of the same order of magnitude. Similarly, evidence of visits to the lunar surface would not survive for more than 100 million years.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49603829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dodecagonal quasicrystals: Construction of 2D lattices and demonstrations using laser pointers 十二角准晶体:二维晶格的构造和用激光笔的演示
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2022-05-21 DOI: 10.20450/mjcce.2022.2368
V. Petrushevski, Sašo Kalajdžievski
{"title":"Dodecagonal quasicrystals: Construction of 2D lattices and demonstrations using laser pointers","authors":"V. Petrushevski, Sašo Kalajdžievski","doi":"10.20450/mjcce.2022.2368","DOIUrl":"https://doi.org/10.20450/mjcce.2022.2368","url":null,"abstract":"Photographic slides of an aperiodic dodecagonal tiling were used as two-dimensional diffraction gratings to describe and demonstrate the basic properties of dodecagonal quasicrystals. This paper complements our earlier publication on Penrose (decagonal) and Ammann (octagonal) quasicrystals, where we constructed and presented the corresponding diffraction gratings.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44402039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In Memoriam - Šebojka Komorsky-Lovrić
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2021-12-20 DOI: 10.20450/mjcce.2021.2441
M. Lovrić
{"title":"In Memoriam - Šebojka Komorsky-Lovrić","authors":"M. Lovrić","doi":"10.20450/mjcce.2021.2441","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2441","url":null,"abstract":"","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43749405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RIS ALiCE Project RIS ALiCE项目
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2021-12-20 DOI: 10.20450/mjcce.2021.2445
E. Fidanchevski
{"title":"RIS ALiCE Project","authors":"E. Fidanchevski","doi":"10.20450/mjcce.2021.2445","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2445","url":null,"abstract":"The project: Al-rich industrial residues for mineral binders in the ESEE region-RIS ALiCE in the frame of the European Institute of Innovation and Technology, Raw materials (EIT-Raw Materials) co-financed by Horizon 2020/ Europe started on March 2019 and will end on February 2022. The “RIS-ALiCE” consortium consists of partners experienced in the relevant field from seven countries (SIovenia, Bosnia and Hercegovina, North Macedonia, Serbia, Hungary, Austria and France). Slovenian National Building and Civil Engineering Institute, Ljubljana, Slovenia coordinates the project.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42168596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Valorization of carbon nanotubes material obtained from polyethylene waste as adsorbent for dyes from wastewater 聚乙烯废碳纳米管吸附废水染料的研究
IF 1 4区 化学
Macedonian Journal of Chemistry and Chemical Engineering Pub Date : 2021-12-15 DOI: 10.20450/mjcce.2021.2424
G. Bogoeva-Gaceva, M. Najdoski, V. Stefov, Suat Ibishi
{"title":"Valorization of carbon nanotubes material obtained from polyethylene waste as adsorbent for dyes from wastewater","authors":"G. Bogoeva-Gaceva, M. Najdoski, V. Stefov, Suat Ibishi","doi":"10.20450/mjcce.2021.2424","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2424","url":null,"abstract":"","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44991695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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