Pub Date : 2022-12-29DOI: 10.35666/2232-7266.2021.59.04
There is a growing need to assess the level of contaminants in fish as bioindicators of the health and well-being of fish and humans as its consumers. Contamination by heavy metals (Cd, Cr, Cu, Fe, Mn, Pb, Zn) was evaluated using atomic absorption spectrometer, flame and graphite furnace technique in the water samples and fish muscle tissues of Sander lucioperca, Leuciscus svallize and Tinca tinca of four hydro-accumulation lakes on the Neretva River, Bosnia and Herzegovina.Samples were collected during two seasons: autumn-winter and spring-summer (2019). It has been shown that iron (Fe) was the highest accumulating metal in fish, whilst cadmium (Cd) and lead (Pb) were the lowest. Heavy metals contents were below the maximum permissible for drinking water and for fish as prescribed by national legislation. According to correlation matrix between metals content in all fish during both fishing seasons, the highest values of the Pearson coefficient were obtained in the case of essential elements (Fe, Mn, Cu and Zn) and Fe and Mn also had a statistically significant correlation with Cd and Pb. Furthermore, potential health risk assessment exposure of the adult population in B&H revealed that none of the seven heavy metals pose risk to human health, based on the estimated daily intake via consumption of these fish species as well as target hazard quotient and hazard index values less than 1.
{"title":"Bioaccumulation of metals in fish from hydro-accumulations on the Neretva River, Bosnia and Herzegovina used in different diets","authors":"","doi":"10.35666/2232-7266.2021.59.04","DOIUrl":"https://doi.org/10.35666/2232-7266.2021.59.04","url":null,"abstract":"There is a growing need to assess the level of contaminants in fish as bioindicators of the health and well-being of fish and humans as its consumers. Contamination by heavy metals (Cd, Cr, Cu, Fe, Mn, Pb, Zn) was evaluated using atomic absorption spectrometer, flame and graphite furnace technique in the water samples and fish muscle tissues of Sander lucioperca, Leuciscus svallize and Tinca tinca of four hydro-accumulation lakes on the Neretva River, Bosnia and Herzegovina.Samples were collected during two seasons: autumn-winter and spring-summer (2019). It has been shown that iron (Fe) was the highest accumulating metal in fish, whilst cadmium (Cd) and lead (Pb) were the lowest. Heavy metals contents were below the maximum permissible for drinking water and for fish as prescribed by national legislation. According to correlation matrix between metals content in all fish during both fishing seasons, the highest values of the Pearson coefficient were obtained in the case of essential elements (Fe, Mn, Cu and Zn) and Fe and Mn also had a statistically significant correlation with Cd and Pb. Furthermore, potential health risk assessment exposure of the adult population in B&H revealed that none of the seven heavy metals pose risk to human health, based on the estimated daily intake via consumption of these fish species as well as target hazard quotient and hazard index values less than 1.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"18 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81047171","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}
Pub Date : 2022-12-01DOI: 10.35666/2232-7266.2021.59.01
The aim of this work was to examine the impact of raspberry extract (Rubus idaeus L.) on copper corrosion characteristics. The raspberry leaf extract was prepared using Soxhlet extraction with ethanol as solvent. The estimation of the total polyphenol content in the obtained sample was determined by UV/Vis spectrophotometric method. The identification and quantification of phenolic acids was performed using HPLC analytical method.In addition, the aim of this work was to examine the impact of individual phenolic compounds (rutin, gallic acid, quercetin, and catechin hydrate) on the corrosion properties of copper. . , The corrosion rate of copper with the extract of the raspberryleafof the Polkavariety was tested. A copper corrosion test was performed in a 3% NaCl solution without and in the presence of the extract. The copper polarization resistance (Rp) values in 3% NaCl solution without and in the presence of the extract weredetermined by the linear polarization method. The corrosion behavior of copper in 3% NaCl solution without and in the presence of extract was determined by specific electrochemical parameters: corrosion potential (Ecorr), corrosion current density (Icorr), and slopes of the anode (βa) and cathode (βk). The electrochemicalimpedance spectroscopy method was used to examine the corrosion behavior of copper in 3% NaCl solution without and in the presence of extract. The results obtained by Tafel extrapolation showed that the corrosion rate decreases in the presence of the tested extract. Studies conducted by the electrochemical impedance spectroscopy method show that the tested extract slows down the kinetics of the corrosion process, which is visible through an increase in resistance. The results confirm that the examined extract can be used for protection in an aggressive medium, such as a 3% NaCl solution.
{"title":"Investigation of Inhibitory Effect of the Rubus idealis L. Extract on Corrosion of Copper","authors":"","doi":"10.35666/2232-7266.2021.59.01","DOIUrl":"https://doi.org/10.35666/2232-7266.2021.59.01","url":null,"abstract":"The aim of this work was to examine the impact of raspberry extract (Rubus idaeus L.) on copper corrosion characteristics. The raspberry leaf extract was prepared using Soxhlet extraction with ethanol as solvent. The estimation of the total polyphenol content in the obtained sample was determined by UV/Vis spectrophotometric method. The identification and quantification of phenolic acids was performed using HPLC analytical method.In addition, the aim of this work was to examine the impact of individual phenolic compounds (rutin, gallic acid, quercetin, and catechin hydrate) on the corrosion properties of copper. . , The corrosion rate of copper with the extract of the raspberryleafof the Polkavariety was tested. A copper corrosion test was performed in a 3% NaCl solution without and in the presence of the extract. The copper polarization resistance (Rp) values in 3% NaCl solution without and in the presence of the extract weredetermined by the linear polarization method. The corrosion behavior of copper in 3% NaCl solution without and in the presence of extract was determined by specific electrochemical parameters: corrosion potential (Ecorr), corrosion current density (Icorr), and slopes of the anode (βa) and cathode (βk). The electrochemicalimpedance spectroscopy method was used to examine the corrosion behavior of copper in 3% NaCl solution without and in the presence of extract. The results obtained by Tafel extrapolation showed that the corrosion rate decreases in the presence of the tested extract. Studies conducted by the electrochemical impedance spectroscopy method show that the tested extract slows down the kinetics of the corrosion process, which is visible through an increase in resistance. The results confirm that the examined extract can be used for protection in an aggressive medium, such as a 3% NaCl solution.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"54 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75315997","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}
Pub Date : 2022-12-01DOI: 10.35666/2232-7266.2021.59.02
Sensitized europium fluorescence was used for simple, fast and efficient determination of tetracycline residues in water from fish farms. Tetracycline antibiotics: oxytetracycline (OTC), tetracycline (TC) and chlortetracycline (CTC) were extracted from water samples using polymeric hydrophilic–lipophilic balanced cartridges. After evaporation and pre-concentration, tetracyclines form a complex with europium and citric acid as coligand at pH 8.5. The complex formed has a wide absorption spectrum at 388 nm and a narrow emission maximum at 619 nm resulting from the 5D0 - 7F2 transition within the europium ion. The complex is stable with intensive fluorescence and linear in the concentration range of 5-2500 µg/L for tetracycline and oxytetracycline and 5-1000 µg/L for chlortetracycline. The detection limit was 0.68 µg/L for OTC, 1.29 µg/L for TC and 0.65 µg/L for CTC, respectively.The proposed method is very sensitive and particularly applicable to samples where low concentrations of tetracycline antibiotics are expected.
{"title":"Optimization and Validation of Europium-Sensitized Fluorescence Method for Determination of Tetracycline Antibiotics in Water from Fish Farms","authors":"","doi":"10.35666/2232-7266.2021.59.02","DOIUrl":"https://doi.org/10.35666/2232-7266.2021.59.02","url":null,"abstract":"Sensitized europium fluorescence was used for simple, fast and efficient determination of tetracycline residues in water from fish farms. Tetracycline antibiotics: oxytetracycline (OTC), tetracycline (TC) and chlortetracycline (CTC) were extracted from water samples using polymeric hydrophilic–lipophilic balanced cartridges. After evaporation and pre-concentration, tetracyclines form a complex with europium and citric acid as coligand at pH 8.5. The complex formed has a wide absorption spectrum at 388 nm and a narrow emission maximum at 619 nm resulting from the 5D0 - 7F2 transition within the europium ion. The complex is stable with intensive fluorescence and linear in the concentration range of 5-2500 µg/L for tetracycline and oxytetracycline and 5-1000 µg/L for chlortetracycline. The detection limit was 0.68 µg/L for OTC, 1.29 µg/L for TC and 0.65 µg/L for CTC, respectively.The proposed method is very sensitive and particularly applicable to samples where low concentrations of tetracycline antibiotics are expected.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"12 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84598060","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}
Pub Date : 2022-12-01DOI: 10.35666/2232-7266.2021.59.03
The aim of this study was to determine the association value between the following parameters and the antioxidant properties of honey: colour, phenolics content (TPC), flavonoid content (TFC), proline and ascorbic acid content. The samples were collected in Bosnia and Herzegovina and Turkey and included honeydew, monofloral and polyfloral honey. The antioxidant activity of honey samples was determined using the ABTS and DPPH assays. Based on the correlation matrix, the main findings revealed a strong correlation between antioxidant activity and TPC, TFC, proline content and colour. Honey colour was in best correlation with the TFC (r = 0.910, p < 0.001) where dark coloured honeys showed a higher TFC, however antioxidant activity showed a highly significant dependence on theTPC (DPPH-TPC: r = - 0.872; ABTS-TPC: r = - 0.783, p < 0.001). Ascorbic acid was not established as a predictive parameter that can be used to estimate the antioxidant properties of honey and did not significantly correlate with any of the remaining variables.
本研究的目的是确定以下参数与蜂蜜抗氧化性能之间的关联值:颜色、酚类物质含量(TPC)、类黄酮含量(TFC)、脯氨酸和抗坏血酸含量。样本采集于波斯尼亚和黑塞哥维那和土耳其，包括蜜露、单花和多花蜂蜜。采用ABTS和DPPH法测定蜂蜜样品的抗氧化活性。基于相关矩阵，主要发现抗氧化活性与TPC、TFC、脯氨酸含量和颜色有较强的相关性。蜂蜜颜色与TFC的相关性最好(r = 0.910, p < 0.001)，其中深色蜂蜜的TFC较高，但抗氧化活性对tpc的依赖性非常显著(DPPH-TPC: r = - 0.872;ABTS-TPC: r = - 0.783, p < 0.001)。抗坏血酸并没有被确定为一个预测参数，可以用来估计蜂蜜的抗氧化性能，并且与任何其他变量都没有显著的相关性。
{"title":"Correlation between antioxidant and physicochemical parameters of honey samples from Bosnia and Herzegovina and Turkey","authors":"","doi":"10.35666/2232-7266.2021.59.03","DOIUrl":"https://doi.org/10.35666/2232-7266.2021.59.03","url":null,"abstract":"The aim of this study was to determine the association value between the following parameters and the antioxidant properties of honey: colour, phenolics content (TPC), flavonoid content (TFC), proline and ascorbic acid content. The samples were collected in Bosnia and Herzegovina and Turkey and included honeydew, monofloral and polyfloral honey. The antioxidant activity of honey samples was determined using the ABTS and DPPH assays. Based on the correlation matrix, the main findings revealed a strong correlation between antioxidant activity and TPC, TFC, proline content and colour. Honey colour was in best correlation with the TFC (r = 0.910, p < 0.001) where dark coloured honeys showed a higher TFC, however antioxidant activity showed a highly significant dependence on theTPC (DPPH-TPC: r = - 0.872; ABTS-TPC: r = - 0.783, p < 0.001). Ascorbic acid was not established as a predictive parameter that can be used to estimate the antioxidant properties of honey and did not significantly correlate with any of the remaining variables.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"132 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87806293","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}
Pub Date : 2022-06-30DOI: 10.35666/2232-7266.2022.58.05
In this paper, the influence of hydrochloric acid and the addition of oxidizing agents on the rate of general corrosion of brass was investigated. For comparison, the corrosion rate of copper and zinc in hydrochloric acid and in hydrochloric acid with oxidizing agent was also tested. The Taffel extrapolation method was used to examine the general corrosion of brass, copper and zinc. The Taffel extrapolation method involves scanning potential of the working electrode of ±250 mV in relation to its open-circuit otential (EOCP), at a speed of 0.5 mVs-1. Investigation of corrosion was conducted in a corrosion cell according to the ASTM G5 (ASTM G5-94) standard, on a potentiostat/galvanostat instrument, Princeton Applied Research, model 263A-2, with PowerCORR® software, which is part of the Power Suite softwere package. The tests were performed at room temperature, 20±1°C. The results show that the corrosion rate of brass is higher in hydrochloric acid with oxidizing agent than the corrosion rate of brass in hydrochloric acid. Examining the effect of hydrochloric acid and the addition of oxidizing agent on the rate of general corrosion of brass, it was found that the corrosion of brass has caused the zinc contained in it. Corrosion of zinc is highest in 0.1 M HCl + 0.1 M H2O2 compared to corrosion of brass and copper in 0.1 M HCl + 0.1 M H2O2, where corrosion of copper is lowest in 0.1 M HCl + 0.1 M H2O2.
本文研究了盐酸和氧化剂的加入对黄铜一般腐蚀速率的影响。为了比较铜和锌在盐酸和加氧剂盐酸中的腐蚀速率。塔菲尔外推法被用来检验黄铜、铜和锌的一般腐蚀。Taffel外推法涉及扫描工作电极的±250 mV电位与其开路电位(EOCP)的关系，速度为0.5 mVs-1。根据ASTM G5 (ASTM G5-94)标准，在腐蚀池中对普林斯顿应用研究公司的电位器/恒流仪进行腐蚀调查，型号263A-2，使用powercorr®软件，该软件是Power Suite软件包的一部分。实验在室温下进行，20±1℃。结果表明，黄铜在含氧化剂的盐酸中的腐蚀速率高于黄铜在盐酸中的腐蚀速率。考察了盐酸和氧化剂的加入对黄铜一般腐蚀速率的影响，发现黄铜的腐蚀是由黄铜中所含的锌引起的。锌在0.1 M HCl + 0.1 M H2O2中腐蚀程度最高，黄铜和铜在0.1 M HCl + 0.1 M H2O2中腐蚀程度最低，铜在0.1 M HCl + 0.1 M H2O2中腐蚀程度最低。
{"title":"Investigation of the effect of the addition H2O2 on the general corrosion of brass in hydrochloric acid","authors":"","doi":"10.35666/2232-7266.2022.58.05","DOIUrl":"https://doi.org/10.35666/2232-7266.2022.58.05","url":null,"abstract":"In this paper, the influence of hydrochloric acid and the addition of oxidizing\u0000agents on the rate of general corrosion of brass was investigated. For comparison, the\u0000corrosion rate of copper and zinc in hydrochloric acid and in hydrochloric acid with\u0000oxidizing agent was also tested. The Taffel extrapolation method was used to examine the\u0000general corrosion of brass, copper and zinc. The Taffel extrapolation method involves\u0000scanning potential of the working electrode of ±250 mV in relation to its open-circuit\u0000otential (EOCP), at a speed of 0.5 mVs-1. Investigation of corrosion was conducted in a\u0000corrosion cell according to the ASTM G5 (ASTM G5-94) standard, on a\u0000potentiostat/galvanostat instrument, Princeton Applied Research, model 263A-2, with\u0000PowerCORR® software, which is part of the Power Suite softwere package. The tests\u0000were performed at room temperature, 20±1°C. The results show that the corrosion rate of\u0000brass is higher in hydrochloric acid with oxidizing agent than the corrosion rate of brass in\u0000hydrochloric acid. Examining the effect of hydrochloric acid and the addition of oxidizing\u0000agent on the rate of general corrosion of brass, it was found that the corrosion of brass has\u0000caused the zinc contained in it. Corrosion of zinc is highest in 0.1 M HCl + 0.1 M H2O2\u0000compared to corrosion of brass and copper in 0.1 M HCl + 0.1 M H2O2, where corrosion\u0000of copper is lowest in 0.1 M HCl + 0.1 M H2O2.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"48 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87441562","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}
Pub Date : 2022-06-30DOI: 10.35666/2232-7266.2022.58.02
In this study, soil samples from two selected locations: “A” (alluvial soil) and “B” (clay loam) were analyzed. Chemical analysis of soil samples included determination of soil pH and soil suspension conductivity. Two different extraction methods were applied: shaking and ultrasound method for extraction of sodium ions from soil with three solvents (aqua regia, 5% CH3COOH and distilled water). The values of pseudo-total (extracted with aqua regia) and bioavailable Na content (extracted with 5% CH3COOH and distilled water) in the soil sample “A” were in the range of 46.35-66.55 mg Na/kg; 14.77-18.59 mg Na/kg and 12.58-15.20 mg Na/kg of soil, respectively, by applying shaking method. By the same method, in the case of soil sample “B” the ranges were 17.15-75.66 mg Na/kg; 20.87-32.80 mg Na/kg and 4.62-20.33 mg Na/kg of soil, for the extraction by aqua regia, 5% CH3COOH and distilled water, respectively. Ultrasonic extraction in all cases gained higher results compared to the shaking method. In general, the application of ultrasound shows a positive effect on the extractability of Na+ ions from soil samples.
{"title":"Extractability of sodium ions from soil","authors":"","doi":"10.35666/2232-7266.2022.58.02","DOIUrl":"https://doi.org/10.35666/2232-7266.2022.58.02","url":null,"abstract":"In this study, soil samples from two selected locations: “A” (alluvial soil) and “B” (clay loam) were analyzed. Chemical analysis of soil samples included determination of soil pH and soil suspension conductivity. Two different extraction methods were applied: shaking and ultrasound method for extraction of sodium ions from soil with three solvents (aqua regia, 5% CH3COOH and distilled water). The values of pseudo-total (extracted with aqua regia) and bioavailable Na content (extracted with 5% CH3COOH and distilled water) in the soil sample “A” were in the range of 46.35-66.55 mg Na/kg; 14.77-18.59 mg Na/kg and 12.58-15.20 mg Na/kg of soil, respectively, by applying shaking method. By the same method, in the case of soil sample “B” the ranges were 17.15-75.66 mg Na/kg; 20.87-32.80 mg Na/kg and 4.62-20.33 mg Na/kg of soil, for the extraction by aqua regia, 5% CH3COOH and distilled water, respectively. Ultrasonic extraction in all cases gained higher results compared to the shaking method. In general, the application of ultrasound shows a positive effect on the extractability of Na+ ions from soil samples.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"11 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86998365","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}
Pub Date : 2022-06-30DOI: 10.35666/2232-7266.2022.58.03
In this paper, the reactions of anhydrous copper(II) chloride in methanolic solution with alanine, glycine, histidine, L-tryptophan, and melatonin were investigated and the resulting products were characterized by FTIR spectroscopy. Based on FTIR characterization, it was shown that these reaction conditions result in the formation of Cu(II) complexes with glycine and alanine, which are more complex structures than bis(glycinato) - and bis(alaninato) copper(II) complexes. Analysis of the FTIR spectrum of the histidine complex shows the participation of several groups in coordination at the Cu(II) center. The complex prepared with melatonin shows unusual changes in the spectral region of the amidic nitrogen bonds. The latter observation is very significant for very few known metal complexes of melatonin, while the synthesis of most of them is an experimentally demanding process with simultaneous control of several parameters. The antioxidant capacity of the synthesized complexes was examined, with the CEAC range from 121.6 to 734.4 µM. The lowest values of antioxidant capacity were recorded for the copper complex with tryptophan, while the highest values were recorded for the copper complex with alanine. A high antioxidant capacity of the copper complex with melatonin (673.8 µM) was also observed.
{"title":"Synthesis, IR characterization and antioxidant capacity of Cu(II)\u0000complexes with amino acids and melatonin","authors":"","doi":"10.35666/2232-7266.2022.58.03","DOIUrl":"https://doi.org/10.35666/2232-7266.2022.58.03","url":null,"abstract":"In this paper, the reactions of anhydrous copper(II) chloride in methanolic solution with\u0000alanine, glycine, histidine, L-tryptophan, and melatonin were investigated and the resulting\u0000products were characterized by FTIR spectroscopy. Based on FTIR characterization, it was shown\u0000that these reaction conditions result in the formation of Cu(II) complexes with glycine and\u0000alanine, which are more complex structures than bis(glycinato) - and bis(alaninato) copper(II)\u0000complexes. Analysis of the FTIR spectrum of the histidine complex shows the participation of\u0000several groups in coordination at the Cu(II) center. The complex prepared with melatonin shows\u0000unusual changes in the spectral region of the amidic nitrogen bonds. The latter observation is very\u0000significant for very few known metal complexes of melatonin, while the synthesis of most of\u0000them is an experimentally demanding process with simultaneous control of several\u0000parameters. The antioxidant capacity of the synthesized complexes was examined, with the CEAC\u0000range from 121.6 to 734.4 µM. The lowest values of antioxidant capacity were recorded for the\u0000copper complex with tryptophan, while the highest values were recorded for the copper complex\u0000with alanine. A high antioxidant capacity of the copper complex with melatonin (673.8 µM) was\u0000also observed.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"11 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87267058","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}
Pub Date : 2022-06-30DOI: 10.35666/2232-7266.2022.58.04
In this paper we investigate the temporal evolution of the electrical resistance through different two-dimensional (2D) packings of Ni beads when 1 mA current is injected in them. In the first stages of measurements, resistance decreases towards a saturation value and it can be fitted with Mittag-Leffler function. Fitting parameters show that the relaxation dynamics does not depend on the type of the packing. Different packings show differences in the initial values of the resistance which is attributed to the formation of new microcontacts during the formation of the new packing. Pauses in the flow of the current cause the resistance either to decrease, increase or remain the same, depending on the packing. Longer measurements show, that after the initial drop, the resistance starts to rise which can probably be attributed to the deterioration of microcontacts between the beads. Small variations in temperature do not affect the temporal evolution of the resistance.
{"title":"Temporal evolution of electrical resistance through the granular\u0000packing of Ni beads","authors":"","doi":"10.35666/2232-7266.2022.58.04","DOIUrl":"https://doi.org/10.35666/2232-7266.2022.58.04","url":null,"abstract":"In this paper we investigate the temporal evolution of the electrical resistance\u0000through different two-dimensional (2D) packings of Ni beads when 1 mA current is injected\u0000in them. In the first stages of measurements, resistance decreases towards a saturation value\u0000and it can be fitted with Mittag-Leffler function. Fitting parameters show that the relaxation\u0000dynamics does not depend on the type of the packing. Different packings show differences\u0000in the initial values of the resistance which is attributed to the formation of new\u0000microcontacts during the formation of the new packing. Pauses in the flow of the current\u0000cause the resistance either to decrease, increase or remain the same, depending on the\u0000packing. Longer measurements show, that after the initial drop, the resistance starts to rise\u0000which can probably be attributed to the deterioration of microcontacts between the beads.\u0000Small variations in temperature do not affect the temporal evolution of the resistance.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"15 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74966064","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}
Pub Date : 2022-06-30DOI: 10.35666/2232-7266.2022.58.01
Bioactive compounds are produced as secondary metabolites in plants. Positive correlation between presence of bioactive compounds and health benefits of plants have been reported in many studies. Sour cherry contains high content of bioactive compounds, mostly polyphenols and anthocyanins. They are mostly consumed in fresh state, but are also used to produce jam, jelly, marmalade, juice, and syrup. Aim of this study was to evaluate total phenolic content, anthocyanins, as well as the antioxidant activity in two sour cherry cultivars and their products, jams and juice, prepared using traditional recipes. Total phenolic content was determined using Folin-Ciocalteu method and antioxidant activity was assessed using ABTS radical cation decolorization assay. pH-Differential method was used to determine anthocyanin content. Marasca cultivar had higher content of phenols, anthocyanins and antioxidant activity than Oblačinska cultivar. Processing of sour cherries had a greater impact on the reduction of anthocyanin content but did not have significant effect on antioxidant activity.
{"title":"Phenolic content and bioactivity of two sour cherry cultivars\u0000and their products","authors":"","doi":"10.35666/2232-7266.2022.58.01","DOIUrl":"https://doi.org/10.35666/2232-7266.2022.58.01","url":null,"abstract":"Bioactive compounds are produced as secondary metabolites in plants. Positive correlation between presence of bioactive compounds and health benefits of plants have been reported in many studies. Sour cherry contains high content of bioactive compounds, mostly polyphenols and anthocyanins. They are mostly consumed in fresh state, but are also used to produce jam, jelly, marmalade, juice, and syrup. Aim of this study was to evaluate total phenolic content, anthocyanins, as well as the antioxidant activity in two sour cherry cultivars and their products, jams and juice, prepared using traditional recipes. Total phenolic content was determined using Folin-Ciocalteu method and antioxidant activity was assessed using ABTS radical cation decolorization assay. pH-Differential method was used to determine anthocyanin content. Marasca cultivar had higher content of phenols, anthocyanins and antioxidant activity than Oblačinska cultivar. Processing of sour cherries had a greater impact on the reduction of anthocyanin content but did not have significant effect on antioxidant activity.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"175 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85427350","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}
Pub Date : 2021-12-30DOI: 10.35666/2232-7266.2021.57.03
Studies have shown that cigarette smoking affects the accumulation of some heavy metals in certain tissues and metabolism of essential elements. The aim of the study was to determine the differences in the concentrations of cadmium in the blood and urine and zinc in the urine of smokers and ex-smokers in relation to non-smokers, and to determine the possible influence of cadmium concentration on zinc excretion as an essential element. The study included 106 subjects. Subjects were regular smokers (n=51), ex-smokers (n=38) and non-smokers (n=17). Atomic absorption spectrophotometry (AAS) with an electrothermal atomizer was used to determine cadmium. Zinc was determined by AAS with a flame atomizer. There was a significant difference in the values of cadmium in the blood between the groups: smokers and non-smokers (p<0.001), smokers and ex-smokers (p <0.001), and between ex-smokers and non-smokers (p = 0.045). There is a significant positive and strong correlation in the level of zinc and cadmium in urine per gram of creatinine, and as the level of cadmium increases, the level of zinc also increases (rho=0.781; p=0.001). The data indicate that cigarette smoking has been shown to be a factor that can increase cadmium levels to an extent that will significantly increase zinc excretion, or its increased loss.
{"title":"Smoking effect on the cadmium and zinc concentration in smokers and nonsmokers","authors":"","doi":"10.35666/2232-7266.2021.57.03","DOIUrl":"https://doi.org/10.35666/2232-7266.2021.57.03","url":null,"abstract":"Studies have shown that cigarette smoking affects the accumulation of some heavy metals in certain tissues and metabolism of essential elements. The aim of the study was to determine the differences in the concentrations of cadmium in the blood and urine and zinc in the urine of smokers and ex-smokers in relation to non-smokers, and to determine the possible influence of cadmium concentration on zinc excretion as an essential element. The study included 106 subjects. Subjects were regular smokers (n=51), ex-smokers (n=38) and non-smokers (n=17). Atomic absorption spectrophotometry (AAS) with an electrothermal atomizer was used to determine cadmium. Zinc was determined by AAS with a flame atomizer. There was a significant difference in the values of cadmium in the blood between the groups: smokers and non-smokers (p<0.001), smokers and ex-smokers (p <0.001), and between ex-smokers and non-smokers (p = 0.045). There is a significant positive and strong correlation in the level of zinc and cadmium in urine per gram of creatinine, and as the level of cadmium increases, the level of zinc also increases (rho=0.781; p=0.001). The data indicate that cigarette smoking has been shown to be a factor that can increase cadmium levels to an extent that will significantly increase zinc excretion, or its increased loss.","PeriodicalId":40710,"journal":{"name":"Glasnik Hemicara i Tehnologa Bosne i Hercegovine","volume":"64 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89152376","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}
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