发布求助
文献互助 智能选刊 最新文献

Facta Universitatis - Series: Physics, Chemistry and Technology最新文献

筛选
英文 中文
Kinetic–spectrophotometric approach to the ampicillin hydrolytic degradation applied for the histidine determination 氨苄西林水解降解组氨酸的动力学分光光度法
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2022-01-01 DOI: 10.2298/fupct2201041r
Ivana Rasic-Misic, S. Tošić, Emilija T. Pecev-Marinković, D. Kostić, B. Arsić
{"title":"Kinetic–spectrophotometric approach to the ampicillin hydrolytic degradation applied for the histidine determination","authors":"Ivana Rasic-Misic, S. Tošić, Emilija T. Pecev-Marinković, D. Kostić, B. Arsić","doi":"10.2298/fupct2201041r","DOIUrl":"https://doi.org/10.2298/fupct2201041r","url":null,"abstract":"The objective of this research was to develop a kinetic-spectrophotometric method for the determination of microquantities of L-histidine in pure form and dietary supplements. The method was based on the kinetics of ampicillin degradation by Ni(II) ion as a catalyst in the presence of L-histidine in a strongly alkaline medium. The rate of this reaction was monitored spectrophotometrically by measuring the increase in absorbance at 265 nm as a function of time. The same approach was used for the investigation of the reaction rate in the absence of histidine. A differential variant of the tangent method was used to process the kinetic data. Beer?s law was obeyed in the interval of histidine concentration from 1.24 ?g/ml to 11.63 ?g/ml with the relative standard deviation ranging from 8.1% to 0.7%. The detection limit of 0.46 ?g/ml was estimated based on the 3S0 criterion. The interference effects of some metal ions, anions, and other molecules on the reaction rate were studied to assess method selectivity. Herein described method was applied for the quantification of histidine in dietary supplements. The point hypothesis test confirmed that there was no significant difference between the proposed and the reference method.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"146 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75931373","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
Rosa canina L. fruit and jam made of it – natural food colors E160a and E160d content and antioxidant capacity 玫瑰果及其制成的果酱-天然食用色素E160a和E160d含量及抗氧化能力
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2022-01-01 DOI: 10.2298/fupct2201079m
Vojkan Miljković, M. Nesic, J. Mrmošanin, I. Gajić, Bojana Miladinović, D. Stojanovic
{"title":"Rosa canina L. fruit and jam made of it – natural food colors E160a and E160d content and antioxidant capacity","authors":"Vojkan Miljković, M. Nesic, J. Mrmošanin, I. Gajić, Bojana Miladinović, D. Stojanovic","doi":"10.2298/fupct2201079m","DOIUrl":"https://doi.org/10.2298/fupct2201079m","url":null,"abstract":"Rosehip is one of the richest sources of vitamin C, and the jam made from it tastes delicious. In this work, the content of food colors E160a (lycopene) and E160d (?-carotene) was determined, as well as the antioxidant capacity of these food products. By applying the UV-Vis spectrophotometric method and using the Lambert-Beer law, a system of two linear equations with two unknowns was set up, which was used to determine the concentrations for the colors E160a and E160d. The content of lycopene and ?-carotene in dried rosehip fruit and jam was 2.34 and 0.85, and 7.25 and 2.01 mg in 100 g of fruit/jam, respectively. The antioxidant capacity of the samples was determined by the DPPH test. The antioxidant capacity of fruit and rosehip jam was 6.84 and 4.17 ?mol of Trolox/100 g of fresh sample. Thermal processing affects the content of lycopene, ?-carotene, and antioxidant capacity. The obtained results reveal beneficial effects of the everyday consumption of dried rosehip fruit and jam.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86031165","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
Pinguisane-type sesquiterpenoids, unique secondary metabolites of liverworts: A review 平棘烷型倍半萜类:肝植物特有的次生代谢产物
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2022-01-01 DOI: 10.2298/fupct2201001f
S. Filipović, A. Bijelić, Andrija I. Bogdanović, N. Radulović
{"title":"Pinguisane-type sesquiterpenoids, unique secondary metabolites of liverworts: A review","authors":"S. Filipović, A. Bijelić, Andrija I. Bogdanović, N. Radulović","doi":"10.2298/fupct2201001f","DOIUrl":"https://doi.org/10.2298/fupct2201001f","url":null,"abstract":"This review summarizes the current knowledge on pinguisane-type sesquiterpenoids, unique secondary metabolites of Hepaticae, their isolation, structural elucidation, possible biosynthetic pathways, total synthesis, and biological/pharmacological activities. Overall, 76 compounds are presented, the majority of which are isolated from or detected in liverwort material as secondary metabolites, while 4 compounds represent artifacts of the isolation procedure. Pinguisane-type sesquiterpenes can be used as chemotaxonomic markers for different taxonomic levels of liverworts, as well as to delineate chemical as well as evolutionary relationships within the Marchantiophyta phylum.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80615215","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
Influence of non-irradiated surface optical absorber on temperature gradient induced by photothermal effect in a thin film 非辐照表面光吸收剂对薄膜中光热效应引起的温度梯度的影响
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2022-01-01 DOI: 10.2298/fupct2201067m
V. Miletic, M. Popović, S. Galović, D. Markushev, Ljiljana Kostić, Miroljub Nesic
{"title":"Influence of non-irradiated surface optical absorber on temperature gradient induced by photothermal effect in a thin film","authors":"V. Miletic, M. Popović, S. Galović, D. Markushev, Ljiljana Kostić, Miroljub Nesic","doi":"10.2298/fupct2201067m","DOIUrl":"https://doi.org/10.2298/fupct2201067m","url":null,"abstract":"This paper presents the model of surface temperature variations, resulting from the photothermal effect induced in a ?thin film ? highly absorbing surface layer? structure, where the thin film is irradiated. The influence of the optical absorption coefficient and sample thickness on the induced temperature gradient is analyzed. It is shown that, depending on the product of these parameters (optical absorbance) in the described structure, the phenomenon of inverse temperature gradient can occur, further influencing the direction and the magnitude of thermoelastic displacement.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83875461","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
Shaping the dynamics of aharonov-bohm caged localized modes by nonlinearity 用非线性方法塑造局域模式的动力学
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2022-01-01 DOI: 10.2298/fupct2201055s
M. Stojanovic, A. Mančić, M. Stepić, A. Maluckov
{"title":"Shaping the dynamics of aharonov-bohm caged localized modes by nonlinearity","authors":"M. Stojanovic, A. Mančić, M. Stepić, A. Maluckov","doi":"10.2298/fupct2201055s","DOIUrl":"https://doi.org/10.2298/fupct2201055s","url":null,"abstract":"Two-dimensional dice lattice can be dressed by artificial flux to host the Aharonov-Bohm (AB) caging effect resulting in the occurrence of a fully flatband spectrum. Here, we focus on the dynamics of flatband compact localized eigenmodes shared by a few unit cells in two snowflake configurations. We numerically show the possibility of dynamically stable propagation of two types of compact localized complexes by tuning the nonlinearity. The caging is imprinted in complexes dynamics regardless of the type and strength of nonlinearity. On the other hand, nonlinearity can only affect the appearance of the caged complex. These findings open a new route for the manipulation of structured light in photonic systems.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76268787","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
Chemical remediation technologies 化学修复技术
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2021-01-01 DOI: 10.2298/fupct2101001j
Tijana Jovanović, M. Petrović, M. Kostić, D. Bojić, A. Bojić
{"title":"Chemical remediation technologies","authors":"Tijana Jovanović, M. Petrović, M. Kostić, D. Bojić, A. Bojić","doi":"10.2298/fupct2101001j","DOIUrl":"https://doi.org/10.2298/fupct2101001j","url":null,"abstract":"Environmental pollution remains one of the most serious world problems. Great efforts are made to limit the release of harmful compounds into the environment, and a variety of methods for remediation of soil, surface water, and groundwater have been developed over the years. Chemical remediation technologies are of great interest since they can remove and degrade pollutants in contaminated sites. This paper focuses on several chemical remediation technologies, such as precipitation, flocculation, adsorption and ion exchange, chemical oxidation, soil washing and flushing, and electrokinetic remediation. Remediation technologies are almost always combined one with another, although they can be used separately. Choosing an appropriate technology will depend on the type of the pollutants and site conditions, and it should be done in such a manner so that the most cost-effective and efficient technology is chosen. Even though some of the technologies are used full-scale, research should be focused on enhancing the existing, and developing new remediation technologies.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"141 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74237134","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: 2
Supercritical CO2 extraction of oils from red grape varieties: Yields and extraction parameters 超临界CO2萃取红葡萄品种油:产量及萃取参数
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2021-01-01 DOI: 10.2298/fupct2101045m
M. Malićanin, Jelena Milanović, I. Zizović, J. Ivanovic, S. Milovanović, V. Rakić
{"title":"Supercritical CO2 extraction of oils from red grape varieties: Yields and extraction parameters","authors":"M. Malićanin, Jelena Milanović, I. Zizović, J. Ivanovic, S. Milovanović, V. Rakić","doi":"10.2298/fupct2101045m","DOIUrl":"https://doi.org/10.2298/fupct2101045m","url":null,"abstract":"In this work, the extraction by supercritical carbon dioxide of grapeseed oil from five red grape varieties was investigated. Apart from an indigenous variety Prokupac, as the domestic, and Merlot and Cabernet Sauvignon, as international grape varieties the most represented in the Republic of Serbia, Pinot Noir and Gamay were studied as well. Extraction conditions were: temperature of 50?C, 250 bar pressure, and 0.3 kg/h flow rate of CO2. It was shown that the extraction kinetics of international grape varieties, mutually similar differ significantly from the domestic one. The obtained oil yields were in the range of 8.3% w/w (Gamay) to 10.4% w/w (Pinot Noir) for the international varieties and 5.0% w/w for the domestic variety. The mathematical model ?Sovova? was applied to define transport parameters regulating the oil mass transfer inside the seed particles and determine the agreement between experimental and model curves. The interpretation of results took into account the differences of grade seed morphologies (outer surfaces and inner layers) which was investigated by SEM analysis.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80029078","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
Lithium aluminum hydride reduction of 1-phenylbutane-1,3-dione, and acetylation of the products: NMR and GC-MS analysis 1-苯基丁烷-1,3-二酮的氢化铝锂还原及产物的乙酰化:NMR和GC-MS分析
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2021-01-01 DOI: 10.2298/fupct2101031z
Milena Zivkovic-Stosic, N. Radulović
{"title":"Lithium aluminum hydride reduction of 1-phenylbutane-1,3-dione, and acetylation of the products: NMR and GC-MS analysis","authors":"Milena Zivkovic-Stosic, N. Radulović","doi":"10.2298/fupct2101031z","DOIUrl":"https://doi.org/10.2298/fupct2101031z","url":null,"abstract":"Reduction of ?-diketones with lithium aluminum hydride (LiAlH4, LAH) can lead to different products, depending on the tautomeric equilibrium: the reduction of diketo forms gives the corresponding diols and the reduction of ketoenol forms yields elimination products, saturated and unsaturated ketones and alcohols. Here, we report on the results of LAH reduction of 1-phenylbutane-1,3-dione. The products of reduction were further acetylated and separated by dry flash chromatography. The obtained products, phenylbut(en)ols, phenylbut(en)ones and phenylbut(en)yl acetates, were characterized by spectral (1H and 13C NMR, MS) and retention index (RI) data. It can be concluded that LAH preferentially reduces the carbonyl group more distant from the phenyl group of 1-phenylbutane-1,3-dione. The structure-retention index relationships between isomers were discussed. Proton splitting patterns were resolved by proton NMR simulations.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89684480","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
Determination of content and antioxidant capacity of natural food colors E160a and E160d in ketchup 番茄酱中天然食用色素E160a和E160d含量及抗氧化能力的测定
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2021-01-01 DOI: 10.2298/fupct2102091m
Vojkan Miljković, M. Nesic, I. Gajić, M. Urošević, J. Mrmošanin, M. Miljković
{"title":"Determination of content and antioxidant capacity of natural food colors E160a and E160d in ketchup","authors":"Vojkan Miljković, M. Nesic, I. Gajić, M. Urošević, J. Mrmošanin, M. Miljković","doi":"10.2298/fupct2102091m","DOIUrl":"https://doi.org/10.2298/fupct2102091m","url":null,"abstract":"After potato, tomato (Solanum lycopersicum) is the world?s second-largest vegetable crop. More than 80% of tomato consumption comes from processed products such as ketchup, tomato juice, pickled tomatoes, sauces, paste, pur?e. Samples of mild ketchup from two different manufacturers (A and B) were selected for the analysis of the content of natural food colors E160a and E160d. Using a UV-Vis spectrophotometric method and Lambert-Beer law, a system of two linear equations with two unknowns was set up, which was used to determine the concentrations of colors E160a and E160d. The antioxidant capacity of the two selected samples was determined using the DPPH assay. The obtained results indicated that the content of colors E160a and E160d was higher in the sample of ketchup B. Also, the DPPH assay showed that the sample of ketchup B had a higher antioxidant capacity.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81086668","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
Chemical composition of seed oil from red grape varieties obtained by supercritical CO2 extraction 超临界CO2萃取法提取红葡萄籽油的化学成分
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2021-01-01 DOI: 10.2298/fupct2102081m
Jelena Milanović, M. Malićanin, I. Zizović, J. Ivanovic, S. Milovanović, V. Rakić
{"title":"Chemical composition of seed oil from red grape varieties obtained by supercritical CO2 extraction","authors":"Jelena Milanović, M. Malićanin, I. Zizović, J. Ivanovic, S. Milovanović, V. Rakić","doi":"10.2298/fupct2102081m","DOIUrl":"https://doi.org/10.2298/fupct2102081m","url":null,"abstract":"This study aimed to investigate the potential of the most abundant red grape variety from the central part of Serbia (the region of three Morava rivers) for grape oil manufacturing, using supercritical CO2 extraction. The content of the main constituents of grape seed oils from the indigenous variety Prokupac was determined and the results of the analysis were compared with selected, most commonly grown, international varieties (Cabernet Sauvignon, Pinot Noir, Merlot, and Gamay). Fatty acid profile and the content of biologically active compounds (total phenolic compounds and ?- tocopherol) were determined. Oxidative stability of the oils was estimated using a DSC (differential scanning calorimetry) method, by determining the oxidation onset temperature. The fatty acid composition was in accordance with literature data. In terms of ?-tocopherol content, its low relative amount was measured in the oils from all grape seed varieties.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90212654","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
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信