Chemistry Journal of Moldova最新文献_第2页

Isothermal section of the La2O3-Lu2O33-Er2O3 ternary phase diagram at 1250°С 1250°С 时 La2O3-Lu2O33-Er2O3 三元相图的等温剖面图

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-12-01 DOI: 10.19261/cjm.2023.1081

O. Chudinovych

引用次数: 0

Mayonnaises from fresh or frozen egg yolk with rapeseed and sesame oils -the influence of egg yolk freezing and storage time and oils ratio 鲜、冻蛋黄加菜籽油和芝麻油制蛋黄酱——蛋黄冷冻贮藏时间和油脂配比的影响

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.1060

A. Tamás, Sabina Nitu, S. Popa, M. Padure

{"title":"Mayonnaises from fresh or frozen egg yolk with rapeseed and sesame oils -the influence of egg yolk freezing and storage time and oils ratio","authors":"A. Tamás, Sabina Nitu, S. Popa, M. Padure","doi":"10.19261/cjm.2023.1060","DOIUrl":"https://doi.org/10.19261/cjm.2023.1060","url":null,"abstract":"The rheological behavior of some mayonnaise varieties prepared from liquid egg yolks, fresh or frozen, whose oily phase is made up of mixtures of sesame oil and rapeseed oil was studied in the current paper. The study examined the influence of the freezing time of the egg yolk, of the ratio between the two types of oil, as well as of the storage time, on the rheological parameters (apparent viscosity, consistency coefficient, flow behavior index). It has been shown that all types of mayonnaise present non-Newtonian behavior (pseudoplastic), because the values of the flow behavior index established from the specific mathematical models (Ostwald de Waele and Herschel-Bulkley) are sub-unit, and the apparent viscosity decreases with the increase of the shear rate. Mayonnaises prepared from frozen egg yolks and those with an oily phase in which sesame oil is predominant, have a higher consistency. The oxidation stability was evaluated by determining the acid values, which increase slightly with the freezing time of the egg yolk and with the amount of sesame oil in the oily phase. From the color tests carried out in the CIELAB color space, the characteristic parameters L*, a* and b* were determined and the lightness of the mayonnaise was assessed.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"7 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80142518","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

Geometrical isomerism in Ru2Au heterometal assembly: cis-linking of tetracyanidoaurate to tetrakis(μ-butanoato)diruthenium Ru2Au异质金属组合中的几何异构:四氰酸酯与四(μ-丁烷)二钌的顺式连接

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.1059

M. Mikuriya, S. Kawauchi, R. Mitsuhashi, M. Tsuboi, M. Handa

引用次数: 0

Characterization of propolis from Moldova's central region: chemical composition, antioxidant and antimicrobial properties 摩尔多瓦中部地区蜂胶的特性:化学成分、抗氧化和抗菌性能

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.924

S. Pogrebnoi, Nicolai Eremia, Dmitri Bilan, Lucian Lupascu, N. Bolocan, G. Duca, Svetlana Armasu, D. Terteac, Vitalie Cebanu, Serghei Tincu, Alexandru Znagovan, Iulia Neicovcena, Olga Coseleva, V. Slanina, F. Macaev

{"title":"Characterization of propolis from Moldova's central region: chemical composition, antioxidant and antimicrobial properties","authors":"S. Pogrebnoi, Nicolai Eremia, Dmitri Bilan, Lucian Lupascu, N. Bolocan, G. Duca, Svetlana Armasu, D. Terteac, Vitalie Cebanu, Serghei Tincu, Alexandru Znagovan, Iulia Neicovcena, Olga Coseleva, V. Slanina, F. Macaev","doi":"10.19261/cjm.2023.924","DOIUrl":"https://doi.org/10.19261/cjm.2023.924","url":null,"abstract":"The chemical composition, antioxidant and antimicrobial activity of propolis ethanolic and water-ethanolic extracts from the central zone of Moldova have been investigated by GC-MS and liquid chromatography. There were found 20 amino acids, of which the most abundant are glutamic acid, alanine, leucine and isoleucine. The main constituents of the alcoholic extract are pinocembrin, n-heptacosan and naringenin. The aqueous-alcoholic extract was characterized by the content of sakuranin, 4-methoxy sakuranetin, caryophylline oxide, isocaryophylline oxide, trans-longipinocarveol. The propolis extracts exhibited strong antioxidant (53.7 mg ascorbic acid eq./g extract or 113.4 mg Trolox eq./g extract and 87.5 mg ascorbic acid eq./g extract or 162 mg Trolox eq./g extract for ethanol, and water-ethanol extract, respectively) and antimicrobial activity (from 0.0055 up to 0.07%), suggesting their potential as natural agents for therapeutic use.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"26 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76025698","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

Synthesis and characterization of zinc oxide and cerium dioxide nanoparticles with possible application for nitrite ions removal in waters 氧化锌和二氧化铈纳米颗粒去除水中亚硝酸盐离子的合成与表征

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.1027

Zainab Abdul-Zahra, R. Rasheed

{"title":"Synthesis and characterization of zinc oxide and cerium dioxide nanoparticles with possible application for nitrite ions removal in waters","authors":"Zainab Abdul-Zahra, R. Rasheed","doi":"10.19261/cjm.2023.1027","DOIUrl":"https://doi.org/10.19261/cjm.2023.1027","url":null,"abstract":"Nitrite ion, a characteristic pollutant, can be removed from water by reverse osmosis, distillation, or ion exchange resin. In this study, we removed it by using ZnO and CeO2 nanoparticles. First, zinc hydroxide and cerium hydroxide were prepared by the hydrothermal method and heated at 90°C to dry. Second, they were annealed at 400°C to produce nanoparticles of ZnO and CeO2, respectively. The obtained samples were characterized by X-ray diffraction to ascertain their structure and chemical composition. The surface morphology analysis of the nanoparticles was performed using scanning electron microscopy. Atomic force microscopy was employed to characterize the imaging surface and ascertain the surface roughness. The functional groups present at the surface of the nanoparticles were investigated using the Fourier transform infrared spectroscopy method. The optical properties of these particles were investigated using the UV-visible spectroscopy. Further, the produced nanoparticles were used to adsorb NO2- ions from aqueous solutions. The results showed that the nanoparticles which were heated at 90°C (hydroxide forms) presented a higher activity for nitrite ions removal than those that were heated at 400°C (oxide forms). This may be related to nitrite ions preferential adsorption to hydroxide forms rather than to oxide forms; in both cases (90°C and 400°C), zinc oxide nanoparticles presented higher nitrite removal activity.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"61 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79485468","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

Bioavailability and migration features of metals in “bottom sediments – water” system under the action of different environmental factors 不同环境因子作用下“底沉积物-水”系统中金属的生物有效性及迁移特征

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.1049

P. Linnik, R. Linnik, V. Zhezherya

{"title":"Bioavailability and migration features of metals in “bottom sediments – water” system under the action of different environmental factors","authors":"P. Linnik, R. Linnik, V. Zhezherya","doi":"10.19261/cjm.2023.1049","DOIUrl":"https://doi.org/10.19261/cjm.2023.1049","url":null,"abstract":"This review considers and summarizes findings of the studies on metals’ coexisting forms in bottom sediments of surface water bodies. This makes it possible to assess metals’ migration ability in the “bottom sediments – water” system and their potential bioavailability for hydrobionts. The coexisting forms of metals in bottom sediments depend on their chemical properties and the component composition of the solid phase. Metals are distributed among exchangeable, carbonate, oxide, organic and residual fractions of bottom sediments. The highest migration ability is observed for metals contained in the first three fractions. Metals migration from organic and residual fractions hardly ever takes place. The oxygen regime, pH and redox potential, total dissolved solids and water temperature, concentration and component composition of organic substances affect the exchange of metals between bottom sediments and overlying water. The metal mobility in the “bottom sediments – water” system will increase under conditions of climate change. This is because cases of dissolved oxygen deficiency become more common, the total dissolved solids get higher in concentration, and pH and redox potential is reduced. Therefore, the development of methods to reduce metals migration from bottom sediments is a relevant task, which is discussed in the present paper.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"16 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72803414","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 and antioxidant activity of lipids from Ficus carica L. fruits 无花果果实脂质化学成分及抗氧化活性研究

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2022.1029

Hadjira Naoui, M. Benalia, Soumaya Hachani, A. Djeridane, Z. Ben Ahmed, V. Seidel, Yousfi Mohamed

{"title":"Chemical composition and antioxidant activity of lipids from Ficus carica L. fruits","authors":"Hadjira Naoui, M. Benalia, Soumaya Hachani, A. Djeridane, Z. Ben Ahmed, V. Seidel, Yousfi Mohamed","doi":"10.19261/cjm.2022.1029","DOIUrl":"https://doi.org/10.19261/cjm.2022.1029","url":null,"abstract":"Samples of oils from seven types of Ficus carica L. fruits from Algeria were investigated through determinations of their chemical characteristics, quantifying sterols and tocopherols, and analysis of the fatty acids profiles using gas chromatography, and evaluation of antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH) method and total antioxidant activity (TAA) using phosphomolybdenum methods. The results show that acid values ranged from 3.14 to 6.95 mg KOH/g indicating on the high amount of free fatty acids in the figs oils. Neutral lipids occupy a very important proportion of the crude figs oils (NL: 60.30–98.40%) compared to glycolipids (GL: 0.58–28.00%) and phospholipids (PL: 0.40-11.70%). Linoleic (11.70–34.74%) and linolenic (1.15–35.27%) were the major unsaturated fatty acids found in lipid fractions, while the main fraction of saturated fatty acid was palmitic. The tocopherols and sterols contents in fig oils ranged from 14.27 to 108.55 mg α-TE/g lipids and from 0.36 to 2.80 mg CE/g lipids respectively. The best inhibition concentration (IC50) of DPPH antioxidant activity was marked by GL (0.23–1.06 g/L) and PL (0.67–1.23 g/L). The strongest TAA was also marked by GL (IC50: 2.84 to 10.08 g/L) and PL (IC50: 3.73–11.30 g/L). This finding demonstrated for the first time that the studied figs oils possessed good antioxidant activity which may be associated with their alleged health benefits.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"35 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75269274","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

Synthesis of quercetin functionalized chitosan and determination of antioxidant properties 槲皮素功能化壳聚糖的合成及抗氧化性能的测定

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.910

M. Gonta, G. Duca, E. Sîrbu, S. Robu, L. Mocanu

{"title":"Synthesis of quercetin functionalized chitosan and determination of antioxidant properties","authors":"M. Gonta, G. Duca, E. Sîrbu, S. Robu, L. Mocanu","doi":"10.19261/cjm.2023.910","DOIUrl":"https://doi.org/10.19261/cjm.2023.910","url":null,"abstract":"This paper is dedicated to the synthesis of a copolymer with reducing properties obtained by functionalizing chitosan with quercetin and determining the antioxidant activity of the derivatives obtained depending on the molar mass of the polymer. For this purpose, low molecular weight chitosan was obtained by oxidizing commercial chitosan with hydrogen peroxide and further functionalization with quercetin by the covalent grafting method. The functionalization process was performed through the following steps: functionalization of chitosan with ethyl chloroformate to increase the reactivity of the amine group to the hydroxyl group of quercetin and grafting the quercetin molecule to the synthesized intermediate. The comparative antioxidant properties of the composite obtained by grafting technical chitosan with quercetin and by grafting low molecular weight chitosan were studied by the DPPH (2,2-diphenyl-1-picrylhydrazyl radical) method. The obtained results indicate that a decrease in the molecular weight of chitosan contributed to its grafting with quercetin. As a result, the functionalized polymer composite acquired a higher antioxidant activity and can be successfully used to inhibit the oxidation of various organic substrates in the cosmetic, food and pharmaceutical industries.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"28 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81224307","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

Volatile compounds identified in traditional croatian cow’s and goat’s cheeses matured in lambskin sack determined by GC-MS analysis 用气相色谱-质谱分析方法测定了克罗地亚传统牛奶酪和山羊奶酪中挥发性化合物的含量

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2023.1076

Ani Radonis, M. Žekić

引用次数: 0

Synthesis and evaluation of antimicrobial activity of tetranorlabdane compounds bearing 1,3,4-thiadiazole units 含1,3,4-噻二唑基四环丹类化合物的合成及抗菌活性评价

IF 0.5

Chemistry Journal of Moldova Pub Date : 2023-06-01 DOI: 10.19261/cjm.2022.1026

S. Blaja, L. Lungu, A. Ciocarlan, N. Vornicu, A. Aricu

引用次数: 0