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Analysis of the mineral profile of milk and Swiss cheese from Tara Dornelor in relation to seasonal and technological factors 塔拉多尼勒牛奶和瑞士奶酪的矿物特征与季节和工艺因素的关系分析
4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2023-09-26 DOI: 10.24193/subbchem.2023.3.03
Doru Necula, Mădălina Ungureanu-Iuga, Sorin Daniel Dan, Octavia Tamas-Krumpe, Laurenț Ognean
{"title":"Analysis of the mineral profile of milk and Swiss cheese from Tara Dornelor in relation to seasonal and technological factors","authors":"Doru Necula, Mădălina Ungureanu-Iuga, Sorin Daniel Dan, Octavia Tamas-Krumpe, Laurenț Ognean","doi":"10.24193/subbchem.2023.3.03","DOIUrl":"https://doi.org/10.24193/subbchem.2023.3.03","url":null,"abstract":"","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135720006","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
Comparison of membrane-based pre-and post-combustion co2 capture options applied in energy-intensive industrial applications 能源密集型工业应用中基于膜的燃烧前和燃烧后二氧化碳捕获方案的比较
4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2023-09-26 DOI: 10.24193/subbchem.2023.3.04
Calin-Cristian Cormos, Marius Sandru, Cristian Dinca, Flavia-Maria Ilea, Alexandra Dudu, Mihaela Diana Lazar, Nela Slavu, Constantin Sava, Letitia Petrescu, Ana-Maria Cormos, Ionela Dumbrava
{"title":"Comparison of membrane-based pre-and post-combustion co2 capture options applied in energy-intensive industrial applications","authors":"Calin-Cristian Cormos, Marius Sandru, Cristian Dinca, Flavia-Maria Ilea, Alexandra Dudu, Mihaela Diana Lazar, Nela Slavu, Constantin Sava, Letitia Petrescu, Ana-Maria Cormos, Ionela Dumbrava","doi":"10.24193/subbchem.2023.3.04","DOIUrl":"https://doi.org/10.24193/subbchem.2023.3.04","url":null,"abstract":"","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135720007","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
Characterization of Botswana coal from two coal fields: Mabesekwa and Mmamabula to determine its coal rank 表征博茨瓦纳煤炭从两个煤田:Mabesekwa和Mmamabula，以确定其煤炭等级
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2020-06-30 DOI: 10.24193/subbchem.2020.2.20
Mmoloki Makoba, Taboka Moalosi, P. Agachi, E. Muzenda, T. Mamvura
{"title":"Characterization of Botswana coal from two coal fields: Mabesekwa and Mmamabula to determine its coal rank","authors":"Mmoloki Makoba, Taboka Moalosi, P. Agachi, E. Muzenda, T. Mamvura","doi":"10.24193/subbchem.2020.2.20","DOIUrl":"https://doi.org/10.24193/subbchem.2020.2.20","url":null,"abstract":"","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"1 1","pages":"243-256"},"PeriodicalIF":0.3,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89622218","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
Tracking the growing rings in biogenic aragonite from fish otolith using confocal Raman microspectroscopy and imaging 用共聚焦拉曼显微光谱和成像技术跟踪鱼耳石中生物文石的生长年轮
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2020-03-30 DOI: 10.24193/subbchem.2020.1.10
G. Lazar, Călin Firta, Sanja Matić-Skoko, M. Peharda, Dario Vrdoljak, H. Uvanović, F. Nekvapil, B. Glamuzina, S. Pînzaru, Cluj-Napoca Romania Molecular Technologies, Šetalište I. Meštrovića Split Croatia Fisheries
{"title":"Tracking the growing rings in biogenic aragonite from fish otolith using confocal Raman microspectroscopy and imaging","authors":"G. Lazar, Călin Firta, Sanja Matić-Skoko, M. Peharda, Dario Vrdoljak, H. Uvanović, F. Nekvapil, B. Glamuzina, S. Pînzaru, Cluj-Napoca Romania Molecular Technologies, Šetalište I. Meštrovića Split Croatia Fisheries","doi":"10.24193/subbchem.2020.1.10","DOIUrl":"https://doi.org/10.24193/subbchem.2020.1.10","url":null,"abstract":"Fish otoliths pose increasing interest due to their potential of rendering information about environmental changes, underlined in their non-linear time-dependent biogenic crystal growth. Otoliths are acellular, metabolically inert and continuously grow in a complex process which still needs to be understood. In the present work confocal Raman microspectroscopy (CRM) and imaging is employed to investigate the growth pattern in otoliths from Sparus aurata of Mediterranean provenance. CRM signal acquired from otolith sagittal section is exploited to associate it with the periodic growth increments denoted as rings. Raman signal collected from the core to the margins with micrometer spatial resolution invariably revealed characteristic signal of aragonite. Relative intensity variability was observed particularly for the lattice modes, indicating changes in crystalline orientation relative to incident laser. Bands associated with organic fraction were absent in the 90-1840 cm-1 spectral range. Daily growth rings were further studied using the Raman mapping of main aragonite bands intensities at 1083, 704 and the lattice modes in the 100-350 cm-1 range. The spectral intensity pattern closely follows the daily growth pattern. Traces of toxic or heavy metals incorporated in biogenic carbonate mineral were spuriously detected in the mapped areas, according to the position and width of the Raman bands of witherite (BaCO3), strontianite (SrCO3), along with the main aragonite and trace of its calcite polymorph.","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"1 1","pages":"125-136"},"PeriodicalIF":0.3,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88731367","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
Determination of biogenic amines by using amperometric biosensors based on grass pea amine oxidase and oat polyamine oxidase 基于草豆胺氧化酶和燕麦多胺氧化酶的安培生物传感器测定生物胺
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2020-01-01 DOI: 10.24193/subbchem.2020.3.01
Laura Aquilante, M. Nistor, S. Taormina, M. Šebela, I. Frébort, I. Popescu
{"title":"Determination of biogenic amines by using amperometric biosensors based on grass pea amine oxidase and oat polyamine oxidase","authors":"Laura Aquilante, M. Nistor, S. Taormina, M. Šebela, I. Frébort, I. Popescu","doi":"10.24193/subbchem.2020.3.01","DOIUrl":"https://doi.org/10.24193/subbchem.2020.3.01","url":null,"abstract":"Grass pea amine oxidase (GPAO) and oat polyamine oxidase (OPAO) were immobilized along with horseradish peroxidase (HRP) and an Os-redox polymer (Os-RP) onto the surface of a graphite electrode by crosslinking with poly(ethylenglycol) diglycidyl ether. The resulted reagentless amperometric biosensors were inserted in a flow injection setup and used as electrochemical detectors for the biogenic amines (BA) detection. Both biosensors were operated at low applied potential (-50 mV vs. Ag/AgCl, KCl0.1M) where electrochemical interferences are minimal. The quantification of ten BA (tyramine, putrescine, cadaverine, histamine, cystamine, phenylethylamine, agmatine, tryptamine, spermine, and spermidine) either individual or in mixture (after a preliminary separation by using cation exchange chromatography) was reported. G/(Os-RP)-HRP-GPAO biosensor detected all ten BA, while G/(Os-RP)-HRP-OPAO biosensor detected only spermine and spermidine. Finally, a simple and low-cost method for free and acetylated polyamines determination in human urine samples, by using the highly selective G/(Os-RP)-HRP-OPAO biosensor, was proposed. (Less)","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"12 1","pages":"9-21"},"PeriodicalIF":0.3,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90426646","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
Novel approaches for the determination of biogenic amines in food samples 食品样品中生物胺测定的新方法
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2017-09-30 DOI: 10.24193/SUBBCHEM.2017.3.08
L. Rivoira, M. Žorž, M. Martelanc, S. Budal, Davide Carena, M. Franko, M. C. Bruzzoniti
{"title":"Novel approaches for the determination of biogenic amines in food samples","authors":"L. Rivoira, M. Žorž, M. Martelanc, S. Budal, Davide Carena, M. Franko, M. C. Bruzzoniti","doi":"10.24193/SUBBCHEM.2017.3.08","DOIUrl":"https://doi.org/10.24193/SUBBCHEM.2017.3.08","url":null,"abstract":"In this work, new analytical approaches for determination of biogenic amines in wines were developed. \u0000For the first time, we studied the derivatization of BAs in wines with naphthalene- 2,3-dicarboxaldehyde (NDA) and with dabsyl chloride (DBS) and analysis of derivatized BAs by HPLC coupled to fluorescence (HPLC-NDA-FL) and thermal lens spectrometry (HPLC-DBS-TLS) detectors. The sensitivity of the two methods (LODs HPLC-NDA-FL in the range 27-73 μg/L; LODs HPLC-DBS-TLS in the range 3.4-11 μg/L) was higher than that of the official method for biogenic amines in wines, OIV-MA-AS315-18 (60-77 μg/L). For its best performances, the HPLC-DBS-TLS technique was applied to the analysis of putrescine, cadaverine, histamine and tyramine in two white wine samples. Additionally, exploiting the Berthelot reaction, the TLS fast screening of biogenic amines in wines, following the release of ammonia by transglutaminase, was also proposed. This approach allowed us to determine total biogenic amount content in concentrations below 0.1 mg/L, expressed as equivalents of histamine.","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"13 1","pages":"103-122"},"PeriodicalIF":0.3,"publicationDate":"2017-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83213344","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: 7
Determination of HLB values of some nonionic surfactants and their mixtures 几种非离子表面活性剂及其混合物HLB值的测定
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2017-01-01 DOI: 10.24193/SUBBCHEM.2017.4.38
Réka Kothencz, R. Nagy, L. Bartha
{"title":"Determination of HLB values of some nonionic surfactants and their mixtures","authors":"Réka Kothencz, R. Nagy, L. Bartha","doi":"10.24193/SUBBCHEM.2017.4.38","DOIUrl":"https://doi.org/10.24193/SUBBCHEM.2017.4.38","url":null,"abstract":"Advanced analytical and impact assessment methods are needed for the development of modern surfactants, so the composition, the effect and other properties of surfactants are examined by analytical tools which may be suitable for the quality testing of the raw materials, the intermediates and the final products. The HLB values of non-ionic surfactants and their mixtures were determined by three different methods: theoretical HLB based on the chemical structure and the given HLB of surfactants, the Greenwald method and an improved, titrimetric method. Our aim was to investigate if the new method to determine the water number and HLB value is suitable for this type of commercial surfactants and their mixtures. The particle size and the turbidity of micelles formed in surfactant solutions were also measured and evaluated.","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"2 1","pages":"451-458"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73266592","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: 8
Dimensionality of big data sets explored by Cluj descriptors Cluj描述符探索的大数据集的维度
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2017-01-01 DOI: 10.24193/SUBBCHEM.2017.3.16
C. Lungu, S. Ersali, Beata Szefler, Atena Pîrvan-Moldovan, S. Basak, M. Diudea
{"title":"Dimensionality of big data sets explored by Cluj descriptors","authors":"C. Lungu, S. Ersali, Beata Szefler, Atena Pîrvan-Moldovan, S. Basak, M. Diudea","doi":"10.24193/SUBBCHEM.2017.3.16","DOIUrl":"https://doi.org/10.24193/SUBBCHEM.2017.3.16","url":null,"abstract":"Dimensionality of a relatively big data set (95 compounds) observed for toxicity (mutagenicity) was explored in order to compute QSAR models. Distinct molecular descriptors were used. Dimensionality of data, using PCA, correlation plots and clustering, was evaluated. Analyzing data dimensionality allowed model optimization. Docking studies and PCA were used in order to expand data dimensionality. Pearson correlation coefficient (r) values, obtained for both perceptive and predictive models, were satisfactory.","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"32 1","pages":"197-204"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77704209","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: 7
The development of analytical methods for the elemental determination of biotic indicators present in aquatic ecosystems 水生生态系统中生物指标元素测定分析方法的发展
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2017-01-01 DOI: 10.24193/SUBBCHEM.2017.2.16
Petra Herman, S. Harangi, M. Fehér, I. Fábián, E. Baranyai
{"title":"The development of analytical methods for the elemental determination of biotic indicators present in aquatic ecosystems","authors":"Petra Herman, S. Harangi, M. Fehér, I. Fábián, E. Baranyai","doi":"10.24193/SUBBCHEM.2017.2.16","DOIUrl":"https://doi.org/10.24193/SUBBCHEM.2017.2.16","url":null,"abstract":"","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"129 4","pages":"213-222"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72488590","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: 2
A novel phenylalanine ammonia-lyase from Kangiella koreensis 一种新的韩国康氏菌苯丙氨酸解氨酶
IF 0.3 4区 化学
Studia Universitatis Babes-bolyai Chemia Pub Date : 2017-01-01 DOI: 10.24193/SUBBCHEM.2017.3.25
A. Varga, Z. Bata, Pál Csuka, Diana Monica Bordea, B. Vértessy, A. Marcovici, F. Irimie, L. Poppe, L. Bencze
{"title":"A novel phenylalanine ammonia-lyase from Kangiella koreensis","authors":"A. Varga, Z. Bata, Pál Csuka, Diana Monica Bordea, B. Vértessy, A. Marcovici, F. Irimie, L. Poppe, L. Bencze","doi":"10.24193/SUBBCHEM.2017.3.25","DOIUrl":"https://doi.org/10.24193/SUBBCHEM.2017.3.25","url":null,"abstract":"This study describes the cloning of the gene encoding a novel phenylalanine ammonia-lyase from Kangiella koreensis (KkPAL) into pET19b expression vector. Optimization of protein expression and purification conditions yielded 15 mg pure soluble protein from one liter of E. coli culture. Enzymatic activity measurements of the ammonia elimination reaction from different natural aromatic amino acids proved the protein to be a phenylalanine ammonia-lyase. The isolated protein showed remarkably high, 81.7 °C melting temperature, making it especially suitable for biocatalytic applications.","PeriodicalId":22005,"journal":{"name":"Studia Universitatis Babes-bolyai Chemia","volume":"1 1","pages":"293-308"},"PeriodicalIF":0.3,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89875203","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: 7
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