Ovidius University Annals of Chemistry最新文献_第7页

Determination of Enalapril maleate from tablets using a new HPLC method 高效液相色谱法测定马来酸依那普利片中依那普利的含量

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2021-01-01 DOI: 10.2478/auoc-2021-0010

S. Gherman, D. Zavastin, A. Șpac, A. Panainte

引用次数: 0

Osmotic dehydration of apple and pear slices: color and chemical characteristics 苹果和梨片的渗透脱水:颜色和化学特性

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-07-01 DOI: 10.2478/auoc-2020-0014

A. Leahu, C. Ghinea, M. Oroian

{"title":"Osmotic dehydration of apple and pear slices: color and chemical characteristics","authors":"A. Leahu, C. Ghinea, M. Oroian","doi":"10.2478/auoc-2020-0014","DOIUrl":"https://doi.org/10.2478/auoc-2020-0014","url":null,"abstract":"Abstract Osmotic dehydration is the pre-treatment method of preservation the fruits and vegetables to increase their shelf life. This method consists of immersing fruits and vegetables in concentrated solutions of salt or sugar. The effect of osmotic dehydration was investigated on the color and chemical characteristics of dehydrated fruits (apple and pear) in fructose osmotic solutions. Difference in CIE-LAB, chroma - C* and hue angle H* were performed with a Chroma Meter CR-400/410. Apple (Malus domestica ‘Jonathan’) and sweet autumn pear variety (Pyrus comunis) were osmotically dehydrated in three aqueous solution of fructose (40, 60 and 80%), during 3 h of process at temperatures of 20 °C, with fruit/osmotic agent ratio of 2:1. Water loss and solids gain showed significant differences depending on the concentration of the osmotic agent and process time. The use of highly concentrated osmotic solutions induced losses of phenolic content (TPC) and ascorbic acid in the sliced apples and pears. Fructose concentration and osmosis time induce significant increase of a* and b* colorimetric parameters but did not affect the lightness (L*) of pear slices.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"61 1","pages":"73 - 79"},"PeriodicalIF":0.9,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77667177","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: 5

Chemical speciation and mobility of heavy metals in soils of refuse dumpsites in some urban towns in the Niger Delta of Nigeria 尼日利亚尼日尔三角洲一些城镇垃圾填埋场土壤中重金属的化学形态和流动性

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-07-01 DOI: 10.2478/auoc-2020-0013

G. Tesi, Joshua O. Ojegu, S. O. Akporido

{"title":"Chemical speciation and mobility of heavy metals in soils of refuse dumpsites in some urban towns in the Niger Delta of Nigeria","authors":"G. Tesi, Joshua O. Ojegu, S. O. Akporido","doi":"10.2478/auoc-2020-0013","DOIUrl":"https://doi.org/10.2478/auoc-2020-0013","url":null,"abstract":"Abstract Refuse dumpsites often contain materials which are capable of polluting surrounding soils especially if the dumpsites are not adequately shielded from the surrounding area. This study examined chemical speciation and mobility of heavy metals in three urban towns in the Niger Delta. Soil samples were collected from three dumpsites in each of the three selected urban towns at 0-15 cm, 15-30 cm and 30-45 cm depths. The chemical speciation of the heavy metals in the soils was determined using the Tessier’s sequential extraction procedure. The results showed that on the average, the residual fraction was the predominant fraction of all the metals except Pb which was dominant in the organic fraction. The mobility factor followed the order Zn > Fe > Pb > Cr > Ni > Cd > Cu. The study indicates that the metals studied do not pose environmental risk considering their relatively low concentrations and the chemical forms they are associated with. It is however recommended that the sites be continuously monitored because of the deleterious health effects of exposure to heavy metal pollution in the events of reclaim.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"12 1","pages":"66 - 72"},"PeriodicalIF":0.9,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87399371","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: 7

Spectrophotometric indicators of the stability of anthocyanin-containing extracts depending on the color of plant materials 植物原料颜色对含花青素提取物稳定性的光度测定指标

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-07-01 DOI: 10.2478/auoc-2020-0016

V. Koldaev, Artem Yurevich Manyakhin, P. S. Zorikov

{"title":"Spectrophotometric indicators of the stability of anthocyanin-containing extracts depending on the color of plant materials","authors":"V. Koldaev, Artem Yurevich Manyakhin, P. S. Zorikov","doi":"10.2478/auoc-2020-0016","DOIUrl":"https://doi.org/10.2478/auoc-2020-0016","url":null,"abstract":"Abstract This paper aims at spectrophotometric determination of changes in stability of extractable anthocyanins during drying of plant materials depending on their color. Raw and dried colored parts of 50 plant species from 25 families were used for the study. The extracts were prepared over 95% ethanol acidified with hydrochloric acid (pH ~ 1). The absorption spectra were registered within the range of 210 to 680 nm. The extinction variability factor, coefficient of intensity absorption relative and generalized stability factor were used to determine the anthocyanin degradation. The highest values of the stability factor were obtained for the extracts from fruit shells of burgundy or violet color within the range of 0.934±0.024 to 0.973±0.024, while the extracts from flower petals of the same care featured the stability factor that was 1.19 to 1.44 times less. The values of the stability factor of the extracts from black, red and blue materials are 1.15 to 1.19 times, 1.74 to 2.48 times and 4.65 to 4.84 times less respectively than those of the extracts from violet-burgundy materials. It is appropriate to apply the spectrophotometric factors of anthocyanins stability used in this study to selection of promising plants for industrial cultivation as material of anthocyanin-containing herbal preparations. The most stable anthocyanins are those of burgundy-purple and black fruits.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"4 1","pages":"88 - 92"},"PeriodicalIF":0.9,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87994966","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

Physicochemical analysis of water and sediments of Usuma Dam, Abuja, Nigeria 尼日利亚阿布贾乌苏马大坝水和沉积物的理化分析

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-07-01 DOI: 10.2478/auoc-2020-0015

I. Ilechukwu, Tolulope Abisola Olusina, O. C. Echeta

{"title":"Physicochemical analysis of water and sediments of Usuma Dam, Abuja, Nigeria","authors":"I. Ilechukwu, Tolulope Abisola Olusina, O. C. Echeta","doi":"10.2478/auoc-2020-0015","DOIUrl":"https://doi.org/10.2478/auoc-2020-0015","url":null,"abstract":"Abstract Usuma Dam is the major source of potable water in the Federal Capital Territory, Abuja, Nigeria. The physicochemical properties of water and sediment of the dam was assessed in this study to determine its quality. Electrical conductivity, pH, nitrate, phosphate, total dissolved solids, total suspended solids, turbidity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, chloride, total hardness, phosphate, nitrate and sulfate were determined in the water samples. Total organic matter, total organic carbon and particle size were among the parameters analyzed in sediments. The parameters were within recommended limits except for biochemical oxygen demand and chemical oxygen demand which were more than the recommended limit of 10 mg/L and 30 mg/L respectively. The total organic matter and the total organic carbon in the sediment samples were between 1.56±0.27 – 2.85±0.20 % and 0.13±0.03 – 0.96±0.03 % respectively. The particle size was in the following order: sand > silt > clay. The results of this study confirmed the presence of high organic and inorganic matter in the dam from non-point pollution sources occasioned by storm water from poorly planned settlements around the dam and runoffs from agricultural practices.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"557 1","pages":"80 - 87"},"PeriodicalIF":0.9,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74820839","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

Phenolic profile and antioxidant activity of bee pollen extracts from different regions of Algeria 阿尔及利亚不同地区蜂花粉提取物的酚类特征和抗氧化活性

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-07-01 DOI: 10.2478/auoc-2020-0017

H. Hemmami, Bachir BEN SEGHİR, M. Ben Ali, A. Rebiai, S. Zeghoud, F. Brahmia

引用次数: 8

The influence of extraction method on the composition and analgesic activity of Calligonum comosum phenolic extracts 不同提取方法对鸡黄酚类提取物成分及镇痛活性的影响

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-01-01 DOI: 10.2478/auoc-2020-0007

A. Chouikh, A. Rebiai

{"title":"The influence of extraction method on the composition and analgesic activity of Calligonum comosum phenolic extracts","authors":"A. Chouikh, A. Rebiai","doi":"10.2478/auoc-2020-0007","DOIUrl":"https://doi.org/10.2478/auoc-2020-0007","url":null,"abstract":"Abstract The aim of this study was to evaluate the analgesic activity and the effect of extraction methods (ultra-sound: UM and maceration: MM) and solvents (ethanol: EtOH and methanol: MeOH) on the composition of phenolic extracts from Calligonum comosum. The results obtained by HPLC analysis demonstrated that the ethanol extracts have shown the highest content of total phenolic and flavonoid compounds. Also, the presence of most known phenolic compounds has been identified in all extracts, especially in the MeOH UM extract. The HPLC analysis showed the presence of ascorbic acid in methanol extracts and caffeic acid in ethanol extracts, and the maceration method shows a high concentration of phenolic compounds, the vanillin was detected in MeOH UM and the appearance of chlorogenic acid in UM extracts, finally the emergence of gallic acid, quercetin and rutin in some extracts. According to the results of the analgesic power, the methanolic extract of the maceration method induces a significant decrease in abdominal cramps compared to the control group and the values obtained are very close from those obtained with the standard anti-inflammatory drug (indomethacin). This result confirmed the beneficial effect of this Saharan plant.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"77 1","pages":"33 - 37"},"PeriodicalIF":0.9,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79685398","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

Enhancement of tartaric acid modified washing solutions for lead decontamination of tropical soils 酒石酸改性洗涤液对热带土壤铅污染的增强作用

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-01-01 DOI: 10.2478/auoc-2020-0006

E. U. Etim

{"title":"Enhancement of tartaric acid modified washing solutions for lead decontamination of tropical soils","authors":"E. U. Etim","doi":"10.2478/auoc-2020-0006","DOIUrl":"https://doi.org/10.2478/auoc-2020-0006","url":null,"abstract":"Abstract Tartaric acid is generally not an effective soil washing solution, hence this study focuses on enhancing its usage for soil-Pb decontamination. Three tropical soil types (sandy, clay and loamy) with different lead concentrations were subjected to single batch washing using 0.01, 0.1, 0.5 and 1 M tartaric acid with 5% and 10% KCl modification at 3% soil-pulp-density for 2, 6, 12 and 24 h washing time. The optimum washing conditions were 1 M tartaric acid at 24 h washing time, with Pb removal efficiency: sandy- 94.3%, clay-67.6% and loamy-36.8%. Modification of tartaric acid with 5% and 10% KCl brought about some degree of enhancement of Pb removal efficiency especially for clay and loamy soils. Removal efficiency for 5% KCl modification were: sandy-97.9%, clay-96.2% with 1 M tartaric acid at 24 h washing time, loamy-76.7% for 0.5 M tartaric acid. Similarly, 10% KCl modification were: sandy-96.7%, clay-97.2% for 1 M tartaric acid at 24 h, loamy-82.1% for 0.5 M tartaric acid. Removal efficiency was soil concentration dependent. Generally, removal efficiency increased with increasing tartaric acid concentrations and washing time. Tartaric acid washing is promising and recommended in events of moderate contamination and 10% KCl modification in event of high level contamination. Further study is needed on enhancing very low concentrations of tartaric acid for large scale applications.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"35 1","pages":"27 - 32"},"PeriodicalIF":0.9,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85851376","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

Life cycle assessment of fermented milk: yogurt production 发酵乳生命周期评价:酸奶生产

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-01-01 DOI: 10.2478/auoc-2020-0010

C. Ghinea, A. Leahu

{"title":"Life cycle assessment of fermented milk: yogurt production","authors":"C. Ghinea, A. Leahu","doi":"10.2478/auoc-2020-0010","DOIUrl":"https://doi.org/10.2478/auoc-2020-0010","url":null,"abstract":"Abstract Yogurt is a fermented milk product, resulted through milk acidification by lactic acid bacteria, highly appreciated worldwide. In this study, life cycle assessment (LCA) methodology was applied for modelling of environmental impacts associated with yogurt production. The system boundaries include the following activities: milk processing, transport, solid waste and wastewater treatments. Functional unit set for this study is 1 kg of produced yogurt. The input and output data were collected from various sources like reports, databases, legislation. All these data were used further in the impact assessment stage performed with GaBi software which includes LCA methods like CML2001 - Jan. 2016, ReCiPe 1.08, UBP 2013, EDIP 2003 and others. Results showed that the global warming potential (GWP) determined for yogurt was 2.92 kg CO2 eq. per kg of yogurt, while acidification potential (AP) was approximately 0.014 kg SO2 eq. per kg of yogurt. It was observed that the main contributor to all impact categories is consumption of electricity during the yogurt production, mainly in the pasteurization, evaporation and cooling stages. 61.4% of the emissions resulted from transportation of raw materials contributes to GWP, while 38.3% to photochemical ozone creation potential (POCP). Emissions from wastewater treatment are contributing especially to the eutrophication potential (EP), while emission from solid waste landfilling are contributing mainly to POCP.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"11 1","pages":"49 - 54"},"PeriodicalIF":0.9,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82953855","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: 3

Occurrence and sources of aliphatic hydrocarbons in anthropogenic impacted soils from petroleum tank-farms in the Niger Delta, Nigeria 尼日利亚尼日尔三角洲油罐农场人为影响土壤中脂肪族烃的发生和来源

IF 0.9

Ovidius University Annals of Chemistry Pub Date : 2020-01-01 DOI: 10.2478/auoc-2020-0022

O. O. Emoyan, Chiedu C. Ikechukwu, G. Tesi

{"title":"Occurrence and sources of aliphatic hydrocarbons in anthropogenic impacted soils from petroleum tank-farms in the Niger Delta, Nigeria","authors":"O. O. Emoyan, Chiedu C. Ikechukwu, G. Tesi","doi":"10.2478/auoc-2020-0022","DOIUrl":"https://doi.org/10.2478/auoc-2020-0022","url":null,"abstract":"Abstract The occurrence and compositional pattern of priority pollutants are vital in understanding the anthropogenic contributions, origin, and risks of these pollutants to the surrounding environment. Thus, the focus of this study was to determine the concentrations, compositional profiles, and sources of aliphatic hydrocarbons (AHCs) in anthropogenic impacted soils from petroleum tank-farms environment in the Niger Delta, Nigeria. Forty-five soil samples were collected from the vicinity of petroleum tank-farms at the top (0-15 cm), sub (15-30 cm), and bottom (30-45 cm) soil depths. The concentration of AHCs was determined using gas chromatography-mass spectrometer (GC-MS) after extraction by ultrasonication with hexane/dichloromethane and clean-up in silica gel/alumina packed column. The mean concentrations of AHCs in the samples ranged from 0.52 ± 0.90 to 35.26 ± 35.69 mg/kg. The AHCs results show that the equivalent carbon number index (ECn-) ECn-13-35 had the highest concentration when compared to ECn-8-12 and ECn-36-40. The linear regression and ANOVA indicate that there is no significant positive correlation between TOC and the total concentration of AHCs in the soil profiles, and a significant variation in AHCs levels between soil profiles respectively. Results also showed that soils from the tank-farms are moderately contaminated with AHCs when compared to the UNEP recommended limit. However, when compared to other regulatory thresholds, the observed concentrations of AHCs, human and environmental health risks are likely. Source apportionments depict that the principal sources of AHCs were petrogenic and plant diagenesis. Appropriate clean-up and mitigation measures and further study to determine the occurrence, composition, and exposure risks of other priority pollutants in water and sediment samples from the surrounding creeks should be determined.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"01 1","pages":"132 - 144"},"PeriodicalIF":0.9,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85962920","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: 5