Stiliyana Pereva, Tsveta Sarafska, V. Petrov, M. Spassova, S. Bogdanova, T. Spassov
Ibuprofen/β-cyclodextrin complex was formed applying a modified melting method, consisting in melting only the drug in the mechanical mixture of ibuprofen and β-cyclodextrin. The ibuprofen inclusion into β-CD was monitored by differential scanning calorimetry after initial release of the water molecules from the CD cavity and was proved by X-ray diffraction and FTIR analyses. Keywords: β-cyclodextrin, ibuprofen, inclusion complex, melting method
{"title":"Ibuprofen/β-CD complexation by controlled annealing of their mechanical mixture","authors":"Stiliyana Pereva, Tsveta Sarafska, V. Petrov, M. Spassova, S. Bogdanova, T. Spassov","doi":"10.34049/bcc.51.3.4907","DOIUrl":"https://doi.org/10.34049/bcc.51.3.4907","url":null,"abstract":"Ibuprofen/β-cyclodextrin complex was formed applying a modified melting method, consisting in melting only the drug in the mechanical mixture of ibuprofen and β-cyclodextrin. The ibuprofen inclusion into β-CD was monitored by differential scanning calorimetry after initial release of the water molecules from the CD cavity and was proved by X-ray diffraction and FTIR analyses. Keywords: β-cyclodextrin, ibuprofen, inclusion complex, melting method","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"125 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75588797","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}
The aim of this work was to investigate the removal of dyes from wastewater by photocatalytic degradation using a modified assembly of photolysis reactor. It was more efficient and dye degradation occurred very fast. UV/Visible spectrophotometry was used to monitor the reaction. The degradation of dyes with different catalysts was compared and found to follow first-order kinetics. The optimal result for Methylene Blue was t(1/2)=4 min, k = 0.4471 min-1, R2 = 0.9650, for Tartrazine - t(1/2) = 1.2 min, k = 0.9723 min-1, R2 = 0.9980 and for Brilliant Green - t(1/2) = 0.8 min, k = 0.9716 min-1, R2 = 0.9938. So, it can be efficiently employed on a larger scale. Keywords: Methylene Blue, Tartrazine, Brilliant Green, Photolysis, Degradation.
本研究的目的是利用改进的光解反应器组件，研究光催化降解废水中染料的去除。它的效率更高，染料降解速度也很快。采用紫外/可见分光光度法对反应进行监测。比较了不同催化剂对染料的降解，发现染料的降解遵循一级动力学。亚甲基蓝最佳提取结果为t(1/2)=4 min, k = 0.4471 min-1, R2 = 0.9650;酒黄石最佳提取结果为t(1/2)= 1.2 min, k = 0.9723 min-1, R2 = 0.9980;翠绿最佳提取结果为t(1/2)= 0.8 min, k = 0.9716min-1, R2 = 0.9938。因此，它可以有效地在更大的范围内使用。关键词:亚甲基蓝，酒黄石，艳绿，光解，降解
{"title":"Rapid photocatalytic degradation of methylene blue, tartrazine and brilliant green dyes by high-flux UV irradiation photolysis reactor","authors":"R. Rehman, W. uz-Zaman, A. Abbas, L. Mitu","doi":"10.34049/bcc.51.3.4683","DOIUrl":"https://doi.org/10.34049/bcc.51.3.4683","url":null,"abstract":"The aim of this work was to investigate the removal of dyes from wastewater by photocatalytic degradation using a modified assembly of photolysis reactor. It was more efficient and dye degradation occurred very fast. UV/Visible spectrophotometry was used to monitor the reaction. The degradation of dyes with different catalysts was compared and found to follow first-order kinetics. The optimal result for Methylene Blue was t(1/2)=4 min, k = 0.4471 min-1, R2 = 0.9650, for Tartrazine - t(1/2) = 1.2 min, k = 0.9723 min-1, R2 = 0.9980 and for Brilliant Green - t(1/2) = 0.8 min, k = 0.9716 min-1, R2 = 0.9938. So, it can be efficiently employed on a larger scale. Keywords: Methylene Blue, Tartrazine, Brilliant Green, Photolysis, Degradation.","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87459683","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}
For the first time a complex study of the bioaccumulation of 22 macro- and microelements, as well as of 18 rare earth and radioactive elements in mosses was applied in the territory of Western Rhodopes. The research is a part of the international program (ICP Vegetation, UNECE) that has been carried out in most of the European countries since 1987. Certain local emitters like old and open mines, serpentines, as well as cross-border transmission were identified. In addition, highest concentrations of radioactive elements were registered in the area of an old uranium mine and most elevated sites, probably due to increased wet deposition. Both heavy metals and toxic elements, as well as radioactive elements maxima were lower than measured highest levels for Bulgaria and Europe. In such studies, inductively coupled plasma spectrometry (ICP-OES, ICP-MS) could be recommended.
{"title":"Air pollution monitoring with mosses in Western Rhodopes, Bulgaria","authors":"N. Gribacheva, G. Gecheva, V. Stefanova","doi":"10.34049/BCC.51.2.5043","DOIUrl":"https://doi.org/10.34049/BCC.51.2.5043","url":null,"abstract":"For the first time a complex study of the bioaccumulation of 22 macro- and microelements, as well as of 18 rare earth and radioactive elements in mosses was applied in the territory of Western Rhodopes. The research is a part of the international program (ICP Vegetation, UNECE) that has been carried out in most of the European countries since 1987. Certain local emitters like old and open mines, serpentines, as well as cross-border transmission were identified. In addition, highest concentrations of radioactive elements were registered in the area of an old uranium mine and most elevated sites, probably due to increased wet deposition. Both heavy metals and toxic elements, as well as radioactive elements maxima were lower than measured highest levels for Bulgaria and Europe. In such studies, inductively coupled plasma spectrometry (ICP-OES, ICP-MS) could be recommended.","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84084166","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}
Pub Date : 2016-01-01DOI: 10.15496/PUBLIKATION-17850
R. Krastev
23 Hofmeister anions effect on the thickness and morphology of polyelectrolyte multilayers for biofunctionalization of cardiovascular stents T. D. Andreeva*, A. K. Danailova, P. Terziyska, S. B. Krumova, S. G. Taneva, R. Krastev 1 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria 2 Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee, Blvd., 1784 Sofia, Bulgaria 3 The Natural and Medical Sciences Institute at the University of Tübingen (NMI), department “Biomaterials”, Markwiesenstraße 55, 72770 Reutlingen, Germany 4 Reutlingen University, Faculty of Applied Chemistry, Alteburgstraße 150, 72762 Reutlingen, Germany
{"title":"Hofmeister anions effect on the thickness and morphology of polyelectrolyte multilayers for biofunctionalization of cardiovascular stents","authors":"R. Krastev","doi":"10.15496/PUBLIKATION-17850","DOIUrl":"https://doi.org/10.15496/PUBLIKATION-17850","url":null,"abstract":"23 Hofmeister anions effect on the thickness and morphology of polyelectrolyte multilayers for biofunctionalization of cardiovascular stents T. D. Andreeva*, A. K. Danailova, P. Terziyska, S. B. Krumova, S. G. Taneva, R. Krastev 1 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria 2 Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee, Blvd., 1784 Sofia, Bulgaria 3 The Natural and Medical Sciences Institute at the University of Tübingen (NMI), department “Biomaterials”, Markwiesenstraße 55, 72770 Reutlingen, Germany 4 Reutlingen University, Faculty of Applied Chemistry, Alteburgstraße 150, 72762 Reutlingen, Germany","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"2014 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86839832","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}
Pub Date : 2013-01-01DOI: 10.15496/publikation-1348
Stefan A. Dochev, M. Ströbele, H. Meyer
2, V = 0.8584(3) A 3 . The spectral behavior of the optimized structures of these compounds was reproduced by the hybrid DFT method B3LYP and HF method both with 6-31G basis set and some semi-empirical methods for comparison. The theoretical spectra were compared with the experimental ones.
{"title":"Synthesis, crystal structure and theoretical study of two isomeric poly-substituted derivatives of 1,4-dihydropyridine","authors":"Stefan A. Dochev, M. Ströbele, H. Meyer","doi":"10.15496/publikation-1348","DOIUrl":"https://doi.org/10.15496/publikation-1348","url":null,"abstract":"2, V = 0.8584(3) A 3 . The spectral behavior of the optimized structures of these compounds was reproduced by the hybrid DFT method B3LYP and HF method both with 6-31G basis set and some semi-empirical methods for comparison. The theoretical spectra were compared with the experimental ones.","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"15 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72401818","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}
Pub Date : 1996-01-01DOI: 10.1016/s0140-6701(00)95338-4
S. Marinov, M. Stefanova
{"title":"ELECTRON PARAMAGNETIC RESONANCE (EPR) STUDY OF REDUCTIVELY ALKYLATED BITUMINOUS COALS","authors":"S. Marinov, M. Stefanova","doi":"10.1016/s0140-6701(00)95338-4","DOIUrl":"https://doi.org/10.1016/s0140-6701(00)95338-4","url":null,"abstract":"","PeriodicalId":9289,"journal":{"name":"Bulgarian Chemical Communications","volume":"370 1","pages":"326-336"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80452326","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}
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