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Alginate: Applications in the modern world 海藻酸盐:在现代世界中的应用
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn1.1.187k
Lazar N. Kulašević
{"title":"Alginate: Applications in the modern world","authors":"Lazar N. Kulašević","doi":"10.46793/chemn1.1.187k","DOIUrl":"https://doi.org/10.46793/chemn1.1.187k","url":null,"abstract":"Alginate is a natural polysaccharide extracted from the cell walls of brown algae. Thanks to its biocompatibility, biodegradability, nontoxicity, and low cost, this biopolymer is widely applicable across various fields of biomedical science and bioengineering. Alginates are used as a gelling agent in food industry. Alginate hydrogels are an appealing scaffold material because of their resemblance with natural tissues. Consequently, alginates are widely used in tissue engineering and alginate gel beads as transport vehicles in drug delivery systems. Nonetheless, alginate hydrogels are used in nanotechnology to build artificial capillary blood vessels.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115403187","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
Textbook presentation: „Rational Design of Bioactive Compounds: From Theoretical to the Practical Approach“ by authors: Milan Mladenovic, Rino Ragno, Nevena Stankovic, Nezrina Mihovic 教科书介绍:“生物活性化合物的合理设计:从理论到实践方法”作者:Milan Mladenovic, Rino Ragno, Nevena Stankovic, Nezrina Mihovic
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn2.2.046k
D. Kostić
{"title":"Textbook presentation: „Rational Design of Bioactive Compounds: From Theoretical to the Practical Approach“ by authors: Milan Mladenovic, Rino Ragno, Nevena Stankovic, Nezrina Mihovic","authors":"D. Kostić","doi":"10.46793/chemn2.2.046k","DOIUrl":"https://doi.org/10.46793/chemn2.2.046k","url":null,"abstract":"","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114681496","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
Calculating stabilization energies for aromatic molecules in schools – quantum chemistry, a valuable tool for teaching and education 计算学校芳香分子的稳定能-量子化学，一个有价值的教学和教育工具
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn5.1.01p
R. Puchta, Thomas Capponi, D. Ćoćić, B. M. Alzoubi, Ilka Shook
{"title":"Calculating stabilization energies for aromatic molecules in schools – quantum chemistry, a valuable tool for teaching and education","authors":"R. Puchta, Thomas Capponi, D. Ćoćić, B. M. Alzoubi, Ilka Shook","doi":"10.46793/chemn5.1.01p","DOIUrl":"https://doi.org/10.46793/chemn5.1.01p","url":null,"abstract":"While aromaticity is one of the most fundamental concepts in chemistry and is taught in many elementary organic chemistry courses, it is hardly possible to activate pupils and students to learn and explore this topic independently. By applying computational chemistry and especially quantum chemistry, we introduce a possibility to activate students, allowing them to test taught concepts and do their own “experiments” cheaply and securely. We have focused in the current report on the structural and energetic aspects of aromaticity, as they are most compatible with other topics of typical chemistry lessons. To evaluate the aromatic stabilization energy, we suggest the simple-to-calculate and easy-to-understand isomerization stabilization energy (ISE) popularized by Paul von Ragué Schleyer and Frank Pühlhofer some 20 years ago. As practical examples, we demonstrate our concept with benzene- and pyridine-based systems and suggest topics for small projects for students and pupils.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122196165","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
Total phenolic content, antioxidant capacity, and antimicrobial activity of Origanum heracleoticum L., extracted with different solvents 不同溶剂提取牛头草总酚含量、抗氧化能力及抗菌活性
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn5.2.36i
Jovana D. Ickovski, I. Palić, A. Đorđević, V. S. Stankov Jovanović, V. Mitić, G. Stojanović
{"title":"Total phenolic content, antioxidant capacity, and antimicrobial activity of Origanum heracleoticum L., extracted with different solvents","authors":"Jovana D. Ickovski, I. Palić, A. Đorđević, V. S. Stankov Jovanović, V. Mitić, G. Stojanović","doi":"10.46793/chemn5.2.36i","DOIUrl":"https://doi.org/10.46793/chemn5.2.36i","url":null,"abstract":"This research was based on the examination of the total phenolic content, antioxidant and antimicrobial activities of hexane, diethyl ether, ethyl acetate, and methanol extracts of Origanum heracleoticum L. grown in Serbia. The antimicrobial activity was determined against five bacteria and two fungi using the disk diffusion method. The total phenolic content of O. heracleoticum solvent extracts was determined and five different tests were used for screening of the antioxidant capacity. The highest total phenolic content was found in ethyl acetate extract (848.48 μg GAE/mg dry extract) and methanol extract (733.43 μg GAE/mg dry extract). The examination of antioxidant activity showed that methanol and ethyl acetate extracts had the strongest activity. The highest correlation was found between DPPH and FRAP (R2 = 0.99), as well as DPPH and CUPRAC (R2= 0.96) assays. The ABTS test was highly correlated with the FRAP test (R2 = 0.95). The antimicrobial assay proved that each extract had an effect against all bacteria and fungi, except against the bacterium Pseudomonas aeruginosa. The highest antibacterial activities were found for methanol extract and ethyl acetate extract against Staphylococcus aureus. The highest antifungal activity was observed for the ethyl acetate extract against both Candida albicans and Aspergillus brasiliensis.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130626595","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
Eco-friendly polymer succinate capping on silver nano-particles for enhanced stability: a UV-Vis and electrochemical particle impact study 生态友好型聚合物琥珀酸盐盖在银纳米颗粒上以增强稳定性:紫外可见和电化学颗粒影响研究
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn3.1.050a
A. Abbas, Hatem M. A. Amin, M. Akhtar, M. Hussain, C. Batchelor‐McAuley, R. Compton
{"title":"Eco-friendly polymer succinate capping on silver nano-particles for enhanced stability: a UV-Vis and electrochemical particle impact study","authors":"A. Abbas, Hatem M. A. Amin, M. Akhtar, M. Hussain, C. Batchelor‐McAuley, R. Compton","doi":"10.46793/chemn3.1.050a","DOIUrl":"https://doi.org/10.46793/chemn3.1.050a","url":null,"abstract":"A facile green method is used to synthesize silver nanoparticles (Ag Nps) in one minute. The colloidal stability of two types of Ag Nps (namely, hydroxypropylcellulose-succinate (HPC-Suc) capped silver nanoparticles (Ag Nps@suc) and citrate-capped silver nanoparticles (Ag Nps@cit)) is investigated using UV-Vis spectrometry and electrochemical particle impacts “nano-impacts” measurements. Ag Nps@suc were newly synthesized by simply mixing aqueous solutions of HPC-Suc and silver nitrate and exposure to sunlight. The growth of Ag Nps was controlled by adjusting the exposure time to sun light. Local surface plasmon resonance (LSPR) study was conducted using UV-Vis spectrophotometer. The surface morphology, size, elemental analysis and composition of Ag NPs@suc was determined by SEM-EDX, while ATR-FTIR was used to assess any type of chemical reactions between the precursors. For stability and size distribution measurements zeta-potential (ZP), dynamic light scattering (DSL) and anodic particle coulometry (APC) were performed. The as-prepared Ag Nps@suc exhibited a narrow size distribution with an average diameter of 20 nm. Nps sizing using particles electrochemical impacts method is consistent with SEM and DLS techniques. The results show that Ag Nps@cit are prone to relatively rapid clustering upon addition of electrolyte (100 mM K2SO4). On the other hand, Ag Nps@suc exhibit excellent stability with only ~ 9% decay in absorbance over 24 h even at high electrolyte concentration. Using KCl, KBr and NaCl electrolytes, the stability of the synthesized Ag Nps@suc also compares favorably to Ag Nps@cit.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"62 s287","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113954099","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
Lipinski’s rule of five, famous extensions and famous exceptions 利平斯基的五法则，著名的扩展和例外
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn3.1.171i
Violeta Ivanović, Miroslav Rančić, B. Arsić, A. Pavlović
{"title":"Lipinski’s rule of five, famous extensions and famous exceptions","authors":"Violeta Ivanović, Miroslav Rančić, B. Arsić, A. Pavlović","doi":"10.46793/chemn3.1.171i","DOIUrl":"https://doi.org/10.46793/chemn3.1.171i","url":null,"abstract":"Mathematical models show qualitative and quantitative dependencies between the structure, physico- chemical properties and activities of the investigated compounds. There are different rules for the prediction of good bioavailability, and one of the most well-known is the Lipinski rule. The rule is related to the molecular properties important for a drug’s pharmacokinetics in the human body: absorption, distribution, metabolism, and excretion (ADME). In addition to the Lipinski rule, there are reported different combinations of criteria that are important predictors of permeability. An additional rule was proposed by Veber. He compared the oral bioavailability of the compound and the permeability of the compound with the molecular flexibility.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126556361","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: 12
Determination of the invertase activity in honey samples as the indicator of the authenticity of honey by UV/VIS spectrophotometric method 紫外/可见分光光度法测定蜂蜜中转化酶活性作为蜂蜜真伪指标
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn4.2.93k
D. Kostić, B. Arsić, J. Mrmošanin, S. Spasić, A. Georgijev
{"title":"Determination of the invertase activity in honey samples as the indicator of the authenticity of honey by UV/VIS spectrophotometric method","authors":"D. Kostić, B. Arsić, J. Mrmošanin, S. Spasić, A. Georgijev","doi":"10.46793/chemn4.2.93k","DOIUrl":"https://doi.org/10.46793/chemn4.2.93k","url":null,"abstract":"Honey is a food consumed by humans of different ages, medical conditions, and professional orientations due to its high health and nutritional properties. Due to other purposes, honey sometimes must be treated, and its values should not be lost. Adulteration of honey is frequently found on the market nowadays, so accurate methods must be used to search for honey-like products. Invertase activity is a good indicator of freshness, thermal treatment, and honey authenticity. A fast UV/VIS spectrophotometric method was modified for the implementation in the food industry for rapid determination of invertase activity of honey samples.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130049483","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
Products of Prolonged Autoxidation of Simple Dihydric Phenols in the Presence of Copper(II) Ions – An Electron Spin Resonance Study 铜离子存在下简单二水酚长时间自氧化的产物——电子自旋共振研究
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn4.2.56n
Milica G. Nikolić, N. Krstic, D. Đorđević
{"title":"Products of Prolonged Autoxidation of Simple Dihydric Phenols in the Presence of Copper(II) Ions – An Electron Spin Resonance Study","authors":"Milica G. Nikolić, N. Krstic, D. Đorđević","doi":"10.46793/chemn4.2.56n","DOIUrl":"https://doi.org/10.46793/chemn4.2.56n","url":null,"abstract":"Electron spin resonance (ESR) spectroscopy was used for characterizing the products obtained by prolonged autoxidation of simple dihydric phenols (hydroquinone, catechol, and 4-methylcatechol) in the presence of copper(II) ions. Room temperature ESR spectra revealed that both paramagnetic copper(II) ions and organic radicals are present in obtained autoxidation products similarly to the humic acid complexed copper(II) ions. The ratio of organic radical signal intensity to the copper(II) ion signal intensity suggests that the smallest amount of copper(II) ions is incorporated in the hydroquinone autoxidation product while the highest amount of copper(II) ions is incorporated in the autoxidation product of catechol. Satisfactory computer simulations of experimental ESR spectra were obtained by considering only one type of copper(II) ion binding site for hydroquinone autoxidation product and two distinct types of copper(II) ion binding sites for catechol and 4-methylcatechol autoxidation products. Parameters obtained by the computer simulation of ESR spectra indicated prevalent ionic bonding of copper(II) ions in polymeric matrices with tetrahedral distortion at copper(II) ion binding sites and negligible exchange interactions between them. Products obtained by the hydroquinone and catechol autoxidation have more similar characteristics in comparison to the product obtained by the 4-methylcatechol autoxidation where more expressed ionic bonding of copper(II) ions, and smaller tetrahedral distortion are present. Due to the dipolar interactions of oxygen-centered organic radicals in autoxidation products with paramagnetic copper(II) ions, their ESR linewidths are larger and g-values smaller in comparison to the values found in humic acids from various soil types.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134147584","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
Chair of Applied and Environmental Chemistry 应用与环境化学主席
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn1.1.072b
A. Bojić, M. Miljkovic, Tatjana Anđelković, A. Zarubica, M. Ranđelović, J. Mitrović
{"title":"Chair of Applied and Environmental Chemistry","authors":"A. Bojić, M. Miljkovic, Tatjana Anđelković, A. Zarubica, M. Ranđelović, J. Mitrović","doi":"10.46793/chemn1.1.072b","DOIUrl":"https://doi.org/10.46793/chemn1.1.072b","url":null,"abstract":"Chair of the Applied and Environmental Chemistry was established in 1995 on the initiative of Prof. Dr. Milovan Purenović, who has been in the position of Head of the Chair since its establishment until his retirement in 2011. Prof. Dr. Aleksandar Bojić is currently Head of the Chair. Since its establishment until now, professors and associates of the Chair of Applied and Environmental Chemistry have been dedicated to the applied research, within the framework of innovative and development projects, which were realized through cooperation with industry. Also, a significant contribution has been made in the field of environmental protection, especially in the treatment of drinking and wastewater. Several operational technologies have been developed, some of them are protected by patents of the Intellectual Property Office of the Republic of Serbia. The Chair of Applied and Environmental Chemistry consists of four full professors, one associate professor, and one assistant professor.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133270814","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
Metal content in common daisy („Bellis perennis L.“) and correspond soils from Niš city area (Serbia) 普通雏菊(Bellis perennis L.)及其对应土壤的金属含量(塞尔维亚)
Chemia Naissensis Pub Date : 1900-01-01 DOI: 10.46793/chemn2.1.096s
M. Stojković, M. Jevtić, Jovana Lj. Pavlović
{"title":"Metal content in common daisy („Bellis perennis L.“) and correspond soils from Niš city area (Serbia)","authors":"M. Stojković, M. Jevtić, Jovana Lj. Pavlović","doi":"10.46793/chemn2.1.096s","DOIUrl":"https://doi.org/10.46793/chemn2.1.096s","url":null,"abstract":"Bellis perennis L. is a common species of daisy, of the Asteraceae family. It is usually found in grasslands, meadows, gardens, urban areas and areas near the roadsides. Emission of heavy metals from traffic activities is an important pollution source to roadside ecosystems. This study focused on ICP OES quantification of some metals of common daisy samples and their growing soils. Plant material (B. perennis L.) and belonging soils from 16 different locations of Niš city area (South-East Serbia) were used for the ICP OES determination of metal content. The concentrations of Al, Ba, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V, and Zn were calculated on a dry weight basis. The pseudo-total metal content of equivalent growing soils was also determined. The study showed that heavy metal content of plant material and growing soils was below the maximally allowed concentrations or below the limit of detection, so we can say that contamination was detected neither in B. perrenis plant material nor in the growing soils.","PeriodicalId":351621,"journal":{"name":"Chemia Naissensis","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122144612","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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