Pub Date : 2021-11-26DOI: 10.20450/mjcce.2021.2397
Irina Mladenovska, Nora Limani Bektashi, Beti Andonović, H. Spasevska, I. Sandeva, Milica Arizanova, S. Mašić, Arianit A. Reka
,
{"title":"Development of a novel microbiological method for detection of gamma irradiated spices","authors":"Irina Mladenovska, Nora Limani Bektashi, Beti Andonović, H. Spasevska, I. Sandeva, Milica Arizanova, S. Mašić, Arianit A. Reka","doi":"10.20450/mjcce.2021.2397","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2397","url":null,"abstract":",","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48456572","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}
Pub Date : 2021-11-26DOI: 10.20450/mjcce.2021.2399
Muammer Burç, D. Asma, Serap Titretir Duran
{"title":"Development of voltammetric melanin sensor with 2,5-dimethylfuran modified platinum electrode","authors":"Muammer Burç, D. Asma, Serap Titretir Duran","doi":"10.20450/mjcce.2021.2399","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2399","url":null,"abstract":"","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46792126","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}
Pub Date : 2021-11-26DOI: 10.20450/mjcce.2021.2400
S. Hadi, B. Irawan, N. Noviany, Y. Yandri, T. Suhartati
The reaction of a trans-diamminediaquaplatinum(II) complex, trans-[Pt(NH3)2(H2O)2] (1), and L-cysteine (R–SH) has been performed to confirm the formation of the products in the solution. The reaction was monitored by 1-D N and 2-D [H, N] heteronuclear single-quantum coherence (HSQC) Nuclear Magnetic Resonance (NMR) and electrospray ionization (ESI) mass spectrometry. The reaction was initially performed in an alkaline solution; the platinum mononuclear species products were observed. The pH of the solution was then decreased to an acidic solution; the products obtained were oligomeric platinum products. Based on the spectrum from mass spectrometry, which was obtained in a basic solution, the most dominant complex in the solution is a dinuclear platinum(II) species with a sulfur-bridging, trans-[{Pt(S-cys)2(NH3)2}2(S-cys)] having m/z of 822. The loss of two successive ammines was observed.
{"title":"Reactions of a trans-diamminediaquaplatinum(II) complex with L-cysteine","authors":"S. Hadi, B. Irawan, N. Noviany, Y. Yandri, T. Suhartati","doi":"10.20450/mjcce.2021.2400","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2400","url":null,"abstract":"The reaction of a trans-diamminediaquaplatinum(II) complex, trans-[Pt(NH3)2(H2O)2] (1), and L-cysteine (R–SH) has been performed to confirm the formation of the products in the solution. The reaction was monitored by 1-D N and 2-D [H, N] heteronuclear single-quantum coherence (HSQC) Nuclear Magnetic Resonance (NMR) and electrospray ionization (ESI) mass spectrometry. The reaction was initially performed in an alkaline solution; the platinum mononuclear species products were observed. The pH of the solution was then decreased to an acidic solution; the products obtained were oligomeric platinum products. Based on the spectrum from mass spectrometry, which was obtained in a basic solution, the most dominant complex in the solution is a dinuclear platinum(II) species with a sulfur-bridging, trans-[{Pt(S-cys)2(NH3)2}2(S-cys)] having m/z of 822. The loss of two successive ammines was observed.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46766530","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}
Pub Date : 2021-11-26DOI: 10.20450/mjcce.2021.2394
A. Janošević Ležaić, N. Pejić, Jelena Goronja, Leposava Pavun, Danijela Đikanović, A. Malenović
,
{"title":"Micellar properties of cetyltrimethylammonium bromide in an acetonitrile–water mixture: Conductometric and fluorescence studies","authors":"A. Janošević Ležaić, N. Pejić, Jelena Goronja, Leposava Pavun, Danijela Đikanović, A. Malenović","doi":"10.20450/mjcce.2021.2394","DOIUrl":"https://doi.org/10.20450/mjcce.2021.2394","url":null,"abstract":",","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46121248","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}
Pub Date : 2021-05-25DOI: 10.20450/MJCCE.2021.2218
M. Bukleski, V. Petruševski, Slavica Aleksova
A way to conciliate one of the most dangerous reactions and at the same time, a way of a systematic approach towards studying the reaction of the alkali metals and acids, has been offered. Explanation of the observed phenomena considering the extent of how vigorous the reaction is and the circumstances contributing to the rate of reaction due to the precipitate formation or water presence, are discussed. In this paper, the reaction between some concentrated aqueous solutions of oxoacids (HNO3, H3PO4, H2SO4, HClO4) and alkali metals (Li, Na, K) are considered. Video clips of the experiments were prepared as an aid for those instructors that lack experience and/or the necessary materials. This publication is a continuation of the previously published article about the reaction of alkali metals with hydrohalic acids and is part of the series of publications under the general title “A Safe Way of Performing Dangerous Experiments”.
{"title":"A safe way of performing dangerous experiments. III. The safety box. 2. Demonstrating the reactions of alkali metals with concentrated oxoacids","authors":"M. Bukleski, V. Petruševski, Slavica Aleksova","doi":"10.20450/MJCCE.2021.2218","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.2218","url":null,"abstract":"A way to conciliate one of the most dangerous reactions and at the same time, a way of a systematic approach towards studying the reaction of the alkali metals and acids, has been offered. Explanation of the observed phenomena considering the extent of how vigorous the reaction is and the circumstances contributing to the rate of reaction due to the precipitate formation or water presence, are discussed. In this paper, the reaction between some concentrated aqueous solutions of oxoacids (HNO3, H3PO4, H2SO4, HClO4) and alkali metals (Li, Na, K) are considered. Video clips of the experiments were prepared as an aid for those instructors that lack experience and/or the necessary materials. This publication is a continuation of the previously published article about the reaction of alkali metals with hydrohalic acids and is part of the series of publications under the general title “A Safe Way of Performing Dangerous Experiments”.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":"40 1","pages":"123"},"PeriodicalIF":1.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67570522","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}
Pub Date : 2021-05-13DOI: 10.20450/MJCCE.2021.2186
Saša Milosavljević, M. Jadranin, Mica A. Mladenovic, V. Tešević, N. Menković, D. Mutavdžić, G. Krstić
The aim of this research was to verify the authenticity of monofloral honeys from the territory of the Republic of Serbia on the basis of physicochemical parameters routinely measured in honey quality control using multivariate analysis. Seventeen samples of monofloral honey (11 samples of acacia honey and 6 samples of sunflower honey) from the territory of the Republic of Serbia were analyzed. Physicochemical analysis of the samples included the examination of basic quality parameters and qualitative and quantitative analyses of phenolic compounds. In the samples tested, a total of 93 phenolic compounds were tentatively identified, and 19 of them were quantified. The obtained physicochemical analysis of the data served as input for the multivariate analysis. The hеаt map, which is useful for visualizing numerical data, was used for this purpose. The obtained results showed that the applied data can serve to clearly separate acacia and sunflower honeys.
{"title":"Physicochemical parameters as indicators of the authenticity of monofloral honey from the territory of the Republic of Serbia","authors":"Saša Milosavljević, M. Jadranin, Mica A. Mladenovic, V. Tešević, N. Menković, D. Mutavdžić, G. Krstić","doi":"10.20450/MJCCE.2021.2186","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.2186","url":null,"abstract":"The aim of this research was to verify the authenticity of monofloral honeys from the territory of the Republic of Serbia on the basis of physicochemical parameters routinely measured in honey quality control using multivariate analysis. Seventeen samples of monofloral honey (11 samples of acacia honey and 6 samples of sunflower honey) from the territory of the Republic of Serbia were analyzed. Physicochemical analysis of the samples included the examination of basic quality parameters and qualitative and quantitative analyses of phenolic compounds. In the samples tested, a total of 93 phenolic compounds were tentatively identified, and 19 of them were quantified. The obtained physicochemical analysis of the data served as input for the multivariate analysis. The hеаt map, which is useful for visualizing numerical data, was used for this purpose. The obtained results showed that the applied data can serve to clearly separate acacia and sunflower honeys.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":"40 1","pages":"49"},"PeriodicalIF":1.0,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48181785","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}
Pub Date : 2021-05-12DOI: 10.20450/MJCCE.2021.1968
B. Büyükkıdan, Nurgün Büyükkıdan, M. Bülbül, M. Yılmaz, Evren Derrun Arslanbay, Ekrem Tunca
Mannich bases (2a–d) of aromatic amines were synthesized by using a conventional microwave technique under solvent-free conditions and characterized by IR and NMR (1H and 13C) and elemental analysis. The inhibitory effects of the synthesized Mannich bases were examined in vitro by using hydratase and esterase assays on carbonic anhydrase I and II isozymes (hCA, EC 4.2.1.1) purified from human erythrocyte cells. Acetazolamide was used as the control compound. The values of IC50, the half-maximum inhibitory concentration, were found for hydratase and esterase activities. Only two compounds (2b and 2d) exhibited poor hCA I and hCA II inhibition effects on esterase activity. In contrast, compounds 2a and 2c could be used as carbonic anhydrase activators as a result of the increased esterase activity of hCA I and hCA II isozymes.
{"title":"Microwave assisted solvent-free mannich bases: synthesis, characterization and effects of these compounds on HCA I and HCA II isozymes","authors":"B. Büyükkıdan, Nurgün Büyükkıdan, M. Bülbül, M. Yılmaz, Evren Derrun Arslanbay, Ekrem Tunca","doi":"10.20450/MJCCE.2021.1968","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.1968","url":null,"abstract":"Mannich bases (2a–d) of aromatic amines were synthesized by using a conventional microwave technique under solvent-free conditions and characterized by IR and NMR (1H and 13C) and elemental analysis. The inhibitory effects of the synthesized Mannich bases were examined in vitro by using hydratase and esterase assays on carbonic anhydrase I and II isozymes (hCA, EC 4.2.1.1) purified from human erythrocyte cells. Acetazolamide was used as the control compound. The values of IC50, the half-maximum inhibitory concentration, were found for hydratase and esterase activities. Only two compounds (2b and 2d) exhibited poor hCA I and hCA II inhibition effects on esterase activity. In contrast, compounds 2a and 2c could be used as carbonic anhydrase activators as a result of the increased esterase activity of hCA I and hCA II isozymes.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":"40 1","pages":"43"},"PeriodicalIF":1.0,"publicationDate":"2021-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46582988","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}
Pub Date : 2021-05-11DOI: 10.20450/MJCCE.2021.2172
Ertuğrul Keskin, Shabnam Allahverdiyeva, Amer S. Alali, Yavuz Yardım
The present work describes a simple, fast, and inexpensive voltammetric method for diflunisal measurement using a non-modified boron-doped diamond (BDD) electrode. The oxidation of the agent was irreversible and presented a diffusion‐controlled process. The sensitivity of the square wave voltammetric measurements were significantly improved when the cationic surfactant, cetyltrimethylammonium bromide (CTAB), was present in the supporting electrolyte solution. Using square-wave mode, a linear response was obtained for diflunisal quantification in 0.1 mol L-1 phosphate buffer solution (pH 2.5) solution containing 5×10-5 mol L-1 CTAB at +1.07 V (vs. Ag/AgCl) (after 30 s accumulation under open-circuit conditions). Linearity was found for 0.05 to 2.0 μg mL-1 (2.0×10-7-8.0×10-6 mol L-1) with a detection limit 0.013 μg mL-1 (5.2×10-8 mol L-1). The developed approach could be used for the quantification of diflunisal in pharmaceutical formulations.
{"title":"Voltammetric quantification of a nonsteroidal anti-inflammatory agent diflunisal based on the enhancement effect of cationic surfactant on boron-doped diamond electrode","authors":"Ertuğrul Keskin, Shabnam Allahverdiyeva, Amer S. Alali, Yavuz Yardım","doi":"10.20450/MJCCE.2021.2172","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.2172","url":null,"abstract":"The present work describes a simple, fast, and inexpensive voltammetric method for diflunisal measurement using a non-modified boron-doped diamond (BDD) electrode. The oxidation of the agent was irreversible and presented a diffusion‐controlled process. The sensitivity of the square wave voltammetric measurements were significantly improved when the cationic surfactant, cetyltrimethylammonium bromide (CTAB), was present in the supporting electrolyte solution. Using square-wave mode, a linear response was obtained for diflunisal quantification in 0.1 mol L-1 phosphate buffer solution (pH 2.5) solution containing 5×10-5 mol L-1 CTAB at +1.07 V (vs. Ag/AgCl) (after 30 s accumulation under open-circuit conditions). Linearity was found for 0.05 to 2.0 μg mL-1 (2.0×10-7-8.0×10-6 mol L-1) with a detection limit 0.013 μg mL-1 (5.2×10-8 mol L-1). The developed approach could be used for the quantification of diflunisal in pharmaceutical formulations.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":"40 1","pages":"11"},"PeriodicalIF":1.0,"publicationDate":"2021-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47689422","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}
Pub Date : 2021-05-11DOI: 10.20450/MJCCE.2021.2236
A. Hejna, M. Barczewski, P. Kosmela, Joanna Aniśko, O. Mysiukiewicz, M. Marć
This work describes the mandarin peel (MP) application as a waste filler for high-density polyethylene (HDPE) composites. The main goal was to investigate the impact of filler’s essential oils, which include multiple terpenes and terpenoids, on the processing, physicochemical, mechanical and thermal properties, as well as color and volatile organic compounds emissions from the composites with different filler content (1-10 wt%). At small loadings, MP can be considered an efficient filler for wood-polymer composites, enhancing their flowability, tensile strength and thermal stability. Besides, it may act as colorant and aroma compound for polymer materials, and enhances the termooxidative resistance of composites. The oxidation induction time was elongated from 20 min for HDPE up to 62 min for the composites with 10 wt% of filler. The obtained research results allow application of the MP not only in the production of highly-filled composites, but also as an additive that significantly enhances the composites’ performance at low concentrations.
{"title":"Mandarin peel as an auspicious functional filler for polymer composites","authors":"A. Hejna, M. Barczewski, P. Kosmela, Joanna Aniśko, O. Mysiukiewicz, M. Marć","doi":"10.20450/MJCCE.2021.2236","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.2236","url":null,"abstract":"This work describes the mandarin peel (MP) application as a waste filler for high-density polyethylene (HDPE) composites. The main goal was to investigate the impact of filler’s essential oils, which include multiple terpenes and terpenoids, on the processing, physicochemical, mechanical and thermal properties, as well as color and volatile organic compounds emissions from the composites with different filler content (1-10 wt%). At small loadings, MP can be considered an efficient filler for wood-polymer composites, enhancing their flowability, tensile strength and thermal stability. Besides, it may act as colorant and aroma compound for polymer materials, and enhances the termooxidative resistance of composites. The oxidation induction time was elongated from 20 min for HDPE up to 62 min for the composites with 10 wt% of filler. The obtained research results allow application of the MP not only in the production of highly-filled composites, but also as an additive that significantly enhances the composites’ performance at low concentrations.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":"40 1","pages":"89-106"},"PeriodicalIF":1.0,"publicationDate":"2021-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49026133","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}
Pub Date : 2021-05-11DOI: 10.20450/MJCCE.2021.2127
M. Ivanović, S. Nenadović, V. Pavlović, Ivona R. Radović, M. Kijevčanin, V. Pavlović, Ljiljana M. Kljajević
In this research, the starting precursor material is metakaolin, which was obtained by calcining domestic kaolinite clay. Thermodynamic parameters: densities, viscosities, speed of sound and refractive index of four series of alkaline activatorswere determined over the temperature range from 15 to 60oC of process of geopolymerization. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman Spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process the changes in the phonon spectrum is confirmed. The different concentrations of activators do not change notably the Si/Al ratio.
{"title":"The influence of thermodynamic parameters on alkaline activator of geopolymers and structure of geopolymers","authors":"M. Ivanović, S. Nenadović, V. Pavlović, Ivona R. Radović, M. Kijevčanin, V. Pavlović, Ljiljana M. Kljajević","doi":"10.20450/MJCCE.2021.2127","DOIUrl":"https://doi.org/10.20450/MJCCE.2021.2127","url":null,"abstract":"In this research, the starting precursor material is metakaolin, which was obtained by calcining domestic kaolinite clay. Thermodynamic parameters: densities, viscosities, speed of sound and refractive index of four series of alkaline activatorswere determined over the temperature range from 15 to 60oC of process of geopolymerization. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman Spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process the changes in the phonon spectrum is confirmed. The different concentrations of activators do not change notably the Si/Al ratio.","PeriodicalId":18088,"journal":{"name":"Macedonian Journal of Chemistry and Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42518493","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}
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