Pub Date : 2020-11-12DOI: 10.13171/mjc10902011121522ybs
Y. B. Soumane, A. Baouid, E. Hadrami, R. Idouhli, L. E. Ammari, Abdeslam Ben Tama, M. Maatallah, M. Berraho, M. Saadi
The reaction of 1,3-dipolar cycloaddition of trans-anethole and three different diarylnitrilimines bearing different substituents X= {H, CH3, Cl} yield to the creation of three 1,3,4,5-tetrasubstituted pyrazoles. These reactions produce a single regioisomer. These compounds' structures were studied using diverse spectroscopic techniques such as 1H, 13C NMR, and HRMS. Afterwards, X-ray diffraction is performed at 5-(4-methoxyphenyl)-4-methyl-1,3-diphenyl-4,5-dihydro-1H-pyrazole. Also, Density Functional Theory (DFT) is performed to characterize these cycloadducts.Moreover, these synthesized compounds' molecular geometry and electronic structures have been studied using high-level ab initio calculations and DFT using the B3LYP functional. All geometries have been optimized at the B3LYP/6-311+G(d,p) basis set with different kinds of solvents. In the end, the protection against corrosion of copper surface is tested using these pyrazolines. As a result, the experimental analysis proved that the obtained cycloadducts belong to the pyrazoline family. Also, X-ray diffraction determined the stereochemistry of these compounds. DFT-based calculations revealed the existence of three stable conformations of each compound. The theoretical study and the experimental spectroscopic data showed perfect matching. The electrochemical investigation indicates that these pyrazoline compounds exhibit a good inhibition performance, preventing the degradation of copper in NaCl (3%) solution with a high inhibition efficiency of 80%.
{"title":"Synthesis, Characterization, Theoretical and Electrochemical Studies of Pyrazoline Derivatives","authors":"Y. B. Soumane, A. Baouid, E. Hadrami, R. Idouhli, L. E. Ammari, Abdeslam Ben Tama, M. Maatallah, M. Berraho, M. Saadi","doi":"10.13171/mjc10902011121522ybs","DOIUrl":"https://doi.org/10.13171/mjc10902011121522ybs","url":null,"abstract":"The reaction of 1,3-dipolar cycloaddition of trans-anethole and three different diarylnitrilimines bearing different substituents X= {H, CH3, Cl} yield to the creation of three 1,3,4,5-tetrasubstituted pyrazoles. These reactions produce a single regioisomer. These compounds' structures were studied using diverse spectroscopic techniques such as 1H, 13C NMR, and HRMS. Afterwards, X-ray diffraction is performed at 5-(4-methoxyphenyl)-4-methyl-1,3-diphenyl-4,5-dihydro-1H-pyrazole. Also, Density Functional Theory (DFT) is performed to characterize these cycloadducts.Moreover, these synthesized compounds' molecular geometry and electronic structures have been studied using high-level ab initio calculations and DFT using the B3LYP functional. All geometries have been optimized at the B3LYP/6-311+G(d,p) basis set with different kinds of solvents. In the end, the protection against corrosion of copper surface is tested using these pyrazolines. As a result, the experimental analysis proved that the obtained cycloadducts belong to the pyrazoline family. Also, X-ray diffraction determined the stereochemistry of these compounds. DFT-based calculations revealed the existence of three stable conformations of each compound. The theoretical study and the experimental spectroscopic data showed perfect matching. The electrochemical investigation indicates that these pyrazoline compounds exhibit a good inhibition performance, preventing the degradation of copper in NaCl (3%) solution with a high inhibition efficiency of 80%.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87999343","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 : 2020-11-11DOI: 10.13171/mjc10902011111537sr
Sanae Rezouki, A. Allali, Bouchra Louasté, N. Eloutassi, M. Fadli
The area studied Taza-Taounate is a vast mountain range in north-central Morocco, characterized by a variation in bio-geographical factors that encourage a vibrant and diversified vegetation cover with a remarkable rate of endemism compared to Moroccan flora. Our work involves the physicochemical analysis of soils at seven stations in the study area. Three surface soil samples (0-15 cm) were collected and analyzed for physical and chemical parameters using standard laboratory techniques at each station. The results showed the clay fraction's dominance in S2 and S3 and the silt fraction in stations S1, S4, S5, S6, and S7. The studied soils have low levels of organic carbon (0.97% to 2.29%), high levels of CaCO3 (10.1% to 24.9%), and neutral and slightly alkaline pH (7.01to 7.81). The most dominant element in all stations is calcium exchangeable, with values ranging from 51.52 to 74.91 cmol+/kg. The other exchangeable basic cations (Mg, Na, K) have relatively low levels. CEC values vary between 36.12 and 81.13 cmol+/kg, indicating that our soil type is heavy to organic.
{"title":"Physico-chemical evaluation of soil resources in different regions of Taza – Taounate, Morocco","authors":"Sanae Rezouki, A. Allali, Bouchra Louasté, N. Eloutassi, M. Fadli","doi":"10.13171/mjc10902011111537sr","DOIUrl":"https://doi.org/10.13171/mjc10902011111537sr","url":null,"abstract":"The area studied Taza-Taounate is a vast mountain range in north-central Morocco, characterized by a variation in bio-geographical factors that encourage a vibrant and diversified vegetation cover with a remarkable rate of endemism compared to Moroccan flora. Our work involves the physicochemical analysis of soils at seven stations in the study area. Three surface soil samples (0-15 cm) were collected and analyzed for physical and chemical parameters using standard laboratory techniques at each station. The results showed the clay fraction's dominance in S2 and S3 and the silt fraction in stations S1, S4, S5, S6, and S7. The studied soils have low levels of organic carbon (0.97% to 2.29%), high levels of CaCO3 (10.1% to 24.9%), and neutral and slightly alkaline pH (7.01to 7.81). The most dominant element in all stations is calcium exchangeable, with values ranging from 51.52 to 74.91 cmol+/kg. The other exchangeable basic cations (Mg, Na, K) have relatively low levels. CEC values vary between 36.12 and 81.13 cmol+/kg, indicating that our soil type is heavy to organic.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"51 1","pages":"836"},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90066397","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 : 2020-11-04DOI: 10.13171/mjc10802011041527re
Rahma Erahioui, Hassna Jaber, S. Inekach, Noureddine Rhaim, Z. Mennane, M. Ouhssine
The Moroccan diet is the Mediterranean characterized by a nutritional model that has remained constant in time and space (main ingredients are olive oil, cereals, fresh or dried fruits, and vegetables...). This study's main objective is to reveal the eating habits, the food combination, and the different types of meals that the Kenitra city population is most adopted through a questionnaire filled in by the participants. An investigation is being carried out from June to August 2018 in Kenitra city. This gives information about the composition of meals taken in Moroccan households. The study covered a sample of 510 homes. Analysis of the results showed that the consumption of raw vegetables in salads and an acidic character was the most frequent. It represents 41.2% of the rest of the salads consumed by the target population. The inclusion in the salad of ingredients with an acid-base character takes second place with a percentage of 19.6%. Salads with essential characteristics took third place, with 17.1%. Regarding the consumption of salads in which specific ingredients are cooked. It emerges from the results that salads with an acid character are the most consumed. The percentage obtained in this case is 54.1%. The salads with acid-base characteristics are consumed by the respondents, with a ratio of 26.5% to occupy the second position. Salads of this category having a primary character are eaten with a frequency of 19.4%. The combinations are characterized by their acidity, which can cause serious digestive problems for the consumer.
{"title":"Food habits of the population of Kenitra city","authors":"Rahma Erahioui, Hassna Jaber, S. Inekach, Noureddine Rhaim, Z. Mennane, M. Ouhssine","doi":"10.13171/mjc10802011041527re","DOIUrl":"https://doi.org/10.13171/mjc10802011041527re","url":null,"abstract":"The Moroccan diet is the Mediterranean characterized by a nutritional model that has remained constant in time and space (main ingredients are olive oil, cereals, fresh or dried fruits, and vegetables...). This study's main objective is to reveal the eating habits, the food combination, and the different types of meals that the Kenitra city population is most adopted through a questionnaire filled in by the participants. An investigation is being carried out from June to August 2018 in Kenitra city. This gives information about the composition of meals taken in Moroccan households. The study covered a sample of 510 homes. Analysis of the results showed that the consumption of raw vegetables in salads and an acidic character was the most frequent. It represents 41.2% of the rest of the salads consumed by the target population. The inclusion in the salad of ingredients with an acid-base character takes second place with a percentage of 19.6%. Salads with essential characteristics took third place, with 17.1%. Regarding the consumption of salads in which specific ingredients are cooked. It emerges from the results that salads with an acid character are the most consumed. The percentage obtained in this case is 54.1%. The salads with acid-base characteristics are consumed by the respondents, with a ratio of 26.5% to occupy the second position. Salads of this category having a primary character are eaten with a frequency of 19.4%. The combinations are characterized by their acidity, which can cause serious digestive problems for the consumer.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"319 1","pages":"828"},"PeriodicalIF":0.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78299878","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 : 2020-11-02DOI: 10.13171/mjc10802011021539st
H. Mira, H. Hussein, S. Tawfik, N. Abed
Wadi El Reddah representing a semi-closed basin, extends in the N-S direction. It has only one outlet at the northern tip while the wadi collects floodwater from internal tributaries along wall rocks. The present study discusses the relationship between geology and geochemistry data to detect anomalous radioactive locations. The geochemical maps show the mineralization areas with abnormal rare metal contents. This led to two uranium occurrences (GXXIII and GXXIV) at Gabal Gattar in the perthitic leucogranite. At Wadi El Reddah, high contents of pathfinder elements (REE, Y, Zn, Nb and As) were discovered at the southern and eastern boundaries. This may be attributed to the presence of alkali feldspar granite at Gabal Gattar at the upstream of Wadi El Reddah and also to the sharp contact between Gabal Gattar and Hammamat Sedimentary rocks. A strong positive correlation coefficient between Fe 2 O t and or Al 2 O 3 with Zr, Hf, Nb, Ta, REE, U, Rb, and Th reflects their association with thematization processes.
Wadi El Reddah代表一个半封闭盆地，向南北方向延伸。它在北端只有一个出水口，而瓦底则从内部的支流沿着岩石收集洪水。本文讨论了地质和地球化学资料在探测放射性异常位置中的关系。地球化学图显示了稀有金属含量异常的矿化区。这导致在Gabal Gattar的两处含铀矿床(GXXIII和GXXIV)位于珠绿质浅花岗岩中。在Wadi El Reddah，在南部和东部边界发现了高含量的探路者元素(REE、Y、Zn、Nb和As)。这可能与Wadi El Reddah上游Gabal Gattar的碱长石花岗岩的存在以及Gabal Gattar与Hammamat沉积岩之间的尖锐接触有关。fe2o3和al2o3与Zr、Hf、Nb、Ta、REE、U、Rb和Th呈显著正相关，反映了它们与主题化过程的关系。
{"title":"Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt","authors":"H. Mira, H. Hussein, S. Tawfik, N. Abed","doi":"10.13171/mjc10802011021539st","DOIUrl":"https://doi.org/10.13171/mjc10802011021539st","url":null,"abstract":"Wadi El Reddah representing a semi-closed basin, extends in the N-S direction. It has only one outlet at the northern tip while the wadi collects floodwater from internal tributaries along wall rocks. The present study discusses the relationship between geology and geochemistry data to detect anomalous radioactive locations. The geochemical maps show the mineralization areas with abnormal rare metal contents. This led to two uranium occurrences (GXXIII and GXXIV) at Gabal Gattar in the perthitic leucogranite. At Wadi El Reddah, high contents of pathfinder elements (REE, Y, Zn, Nb and As) were discovered at the southern and eastern boundaries. This may be attributed to the presence of alkali feldspar granite at Gabal Gattar at the upstream of Wadi El Reddah and also to the sharp contact between Gabal Gattar and Hammamat Sedimentary rocks. A strong positive correlation coefficient between Fe 2 O t and or Al 2 O 3 with Zr, Hf, Nb, Ta, REE, U, Rb, and Th reflects their association with thematization processes.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"2 1","pages":"809-827"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73263042","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 : 2020-10-27DOI: 10.13171/mjc10802010271525ko
Kambiré Ollo, Pohan Lemeyonouin Aliou Guillaume, S. S. Placide, Kouadio Kouakou Etienne, Ouattara Lassiné
This work aimed to contribute to the mechanism electrochemical oxidation study of organic compounds on DSA electrodes. To do this, IrO 2 and RuO 2 electrodes were prepared thermally at 40°C on Titanium substrate. The prepared electrodes were characterized using voltammetric and SEM techniques. The electrochemical measurements in acid media made it possible to show the presence of IrO 2 and RuO 2 on the surface of the electrode. These electrodes have identical electrocatalytic behaviors both for oxygen evolution and chlorine evolution. The prepared electrodes make it possible to oxidize the organic compounds in an acid media in the absence or in the presence of Cl - . In acidic electrolytes, water molecules produce hydroxyl radicals that contribute to the higher oxides (RuO 3 or IrO 3 ) formation. The higher oxides obtained produce O 2 and regenerate the active sites of our electrodes. In the electrolytes containing chlorides, higher oxides fix them (IrO 3 (Cl) or RuO 3 (Cl)) in competition with the production of O 2 . Then IrO 3 (Cl) or RuO 3 (Cl) reacts with Cl - to produce Cl 2 and regenerate the adsorbed hydroxyl radicals. The higher oxides also react as a mediator in HCOOH oxidation in competition with O 2 evolvement. In the electrolytes containing HCOOH and Cl - , the organic pollutant's oxidation occurs indirectly via the hypochlorite ions produced in the solution and on the electrodes. This study showed that the produced OH· and Cl 2 in situ are involved in the oxidation of HCOOH
{"title":"Voltammetric study of formic acid oxidation via active chlorine on IrO2/Ti and RuO2/Ti electrodes","authors":"Kambiré Ollo, Pohan Lemeyonouin Aliou Guillaume, S. S. Placide, Kouadio Kouakou Etienne, Ouattara Lassiné","doi":"10.13171/mjc10802010271525ko","DOIUrl":"https://doi.org/10.13171/mjc10802010271525ko","url":null,"abstract":"This work aimed to contribute to the mechanism electrochemical oxidation study of organic compounds on DSA electrodes. To do this, IrO 2 and RuO 2 electrodes were prepared thermally at 40°C on Titanium substrate. The prepared electrodes were characterized using voltammetric and SEM techniques. The electrochemical measurements in acid media made it possible to show the presence of IrO 2 and RuO 2 on the surface of the electrode. These electrodes have identical electrocatalytic behaviors both for oxygen evolution and chlorine evolution. The prepared electrodes make it possible to oxidize the organic compounds in an acid media in the absence or in the presence of Cl - . In acidic electrolytes, water molecules produce hydroxyl radicals that contribute to the higher oxides (RuO 3 or IrO 3 ) formation. The higher oxides obtained produce O 2 and regenerate the active sites of our electrodes. In the electrolytes containing chlorides, higher oxides fix them (IrO 3 (Cl) or RuO 3 (Cl)) in competition with the production of O 2 . Then IrO 3 (Cl) or RuO 3 (Cl) reacts with Cl - to produce Cl 2 and regenerate the adsorbed hydroxyl radicals. The higher oxides also react as a mediator in HCOOH oxidation in competition with O 2 evolvement. In the electrolytes containing HCOOH and Cl - , the organic pollutant's oxidation occurs indirectly via the hypochlorite ions produced in the solution and on the electrodes. This study showed that the produced OH· and Cl 2 in situ are involved in the oxidation of HCOOH","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"29 1","pages":"799-808"},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78115707","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 : 2020-10-06DOI: 10.13171/mjc10802010061536rc
A. Kramell, Bianka Siewert, J. Wiese, V. Temml, H. Deigner, A. Al‐Harrasi, R. Csuk
In this study, several derivatives of brazilin with different lipophilicity were synthesized. The cytotoxic potential of these substances was evaluated in S.R.B. assays. A triacetylated brazilin reaction with PBr 3 or PCl 3 and a subsequent aqueous workup led to the formation of a phosphorous ester containing two triacetylated brazilin subunits. This compound held unexpected high cytotoxicity. In this study, Brazilin-derived triacetate showed good cytotoxic activity (EC50 = 5.2 M) concerning A2780 carcinoma cells. The results from docking studies suggest that brazilin's cytotoxicity might be due to an inhibition of a tyrosine kinase in an ATP-competitive manner.
{"title":"The cytotoxicity of brazilin and derivatives might be due to an inhibition of the c-Src-kinase","authors":"A. Kramell, Bianka Siewert, J. Wiese, V. Temml, H. Deigner, A. Al‐Harrasi, R. Csuk","doi":"10.13171/mjc10802010061536rc","DOIUrl":"https://doi.org/10.13171/mjc10802010061536rc","url":null,"abstract":"In this study, several derivatives of brazilin with different lipophilicity were synthesized. The cytotoxic potential of these substances was evaluated in S.R.B. assays. A triacetylated brazilin reaction with PBr 3 or PCl 3 and a subsequent aqueous workup led to the formation of a phosphorous ester containing two triacetylated brazilin subunits. This compound held unexpected high cytotoxicity. In this study, Brazilin-derived triacetate showed good cytotoxic activity (EC50 = 5.2 M) concerning A2780 carcinoma cells. The results from docking studies suggest that brazilin's cytotoxicity might be due to an inhibition of a tyrosine kinase in an ATP-competitive manner.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"89 1","pages":"790-798"},"PeriodicalIF":0.0,"publicationDate":"2020-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90062947","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 : 2020-09-22DOI: 10.13171/MJC10802009221517LB
Laila Bouzit, Dorsaf Bouharat, F. E. Yousfi, M. Stitou
: The present work compares the biosorption capacity of Fe 3+ by the living biomass presented in our previous study with dead biomass prepared from the same microalgae after deactivating the cells using temperature (drying). This technique (dry biomass) is the most frequently used in biological processes based on adsorption by microalgae. The influence of different parameters on the biosorption capacity of the two biomasses was studied. The highest efficiency of metal removal was recorded by a live microalgae Scenedesmus obliquus, with a removal value of 100% within 20 minutes versus to 43% for dried microalgae within 60 minutes. This work confirms the potential use of a live microalgae Scenedesmus obliquus as an efficient technique for removing ions from wastewater.
{"title":"Comparative study of the biosorption of Fe3+ ion by living and dead biomass prepared from the microalga Scenedesmus obliquus","authors":"Laila Bouzit, Dorsaf Bouharat, F. E. Yousfi, M. Stitou","doi":"10.13171/MJC10802009221517LB","DOIUrl":"https://doi.org/10.13171/MJC10802009221517LB","url":null,"abstract":": The present work compares the biosorption capacity of Fe 3+ by the living biomass presented in our previous study with dead biomass prepared from the same microalgae after deactivating the cells using temperature (drying). This technique (dry biomass) is the most frequently used in biological processes based on adsorption by microalgae. The influence of different parameters on the biosorption capacity of the two biomasses was studied. The highest efficiency of metal removal was recorded by a live microalgae Scenedesmus obliquus, with a removal value of 100% within 20 minutes versus to 43% for dried microalgae within 60 minutes. This work confirms the potential use of a live microalgae Scenedesmus obliquus as an efficient technique for removing ions from wastewater.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"18 1","pages":"783-789"},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75489663","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 : 2020-09-10DOI: 10.13171/mjc10802009101498mm
M. Muharni, Elfita Elfita, H. Yohandini, C. Valenta
In this study, we were interested in comparing the influence of different extraction methods on antioxidant and antibacterial activities of V.amygdalina leaves extracts. The extracts were also analyzed for their total phenolic and flavonoid content. The extraction methods used maceration, soxhlet, and fractionation, the evaluation of antioxidant activity using DPPH (1,1-diphenyl-2-picryl-hydrazyl) method and antibacterial activity by agar diffusion method. The total phenolic and flavonoids are determined by the spectrophotometric method. Ethanol extract by fractionating on this method showed the highest antioxidant properties compared to other extracts with IC 50 170 μg/mL in category potent antioxidant with total phenolic content 28.83 ± 2.62 mg GAE/g, and the total flavonoid content 18.78 ± 0.15 mg QE/g. Evaluation of antibacterial properties the extracts of V. amyigdalina showed moderate antibacterial activity against all bacteria tests with inhibition zone 6.1 ± 0.1 to 9.4 ± 0.9 mm at variation concentration 62.5 – 1000 μg/mL. The fractionation method using ethanol solvent is the best for the extraction of antioxidant compounds from V. amygdalina .
{"title":"Comparison extraction methods for evaluating antioxidant and antibacterial properties of Vernonia amygdalina leaves extract","authors":"M. Muharni, Elfita Elfita, H. Yohandini, C. Valenta","doi":"10.13171/mjc10802009101498mm","DOIUrl":"https://doi.org/10.13171/mjc10802009101498mm","url":null,"abstract":"In this study, we were interested in comparing the influence of different extraction methods on antioxidant and antibacterial activities of V.amygdalina leaves extracts. The extracts were also analyzed for their total phenolic and flavonoid content. The extraction methods used maceration, soxhlet, and fractionation, the evaluation of antioxidant activity using DPPH (1,1-diphenyl-2-picryl-hydrazyl) method and antibacterial activity by agar diffusion method. The total phenolic and flavonoids are determined by the spectrophotometric method. Ethanol extract by fractionating on this method showed the highest antioxidant properties compared to other extracts with IC 50 170 μg/mL in category potent antioxidant with total phenolic content 28.83 ± 2.62 mg GAE/g, and the total flavonoid content 18.78 ± 0.15 mg QE/g. Evaluation of antibacterial properties the extracts of V. amyigdalina showed moderate antibacterial activity against all bacteria tests with inhibition zone 6.1 ± 0.1 to 9.4 ± 0.9 mm at variation concentration 62.5 – 1000 μg/mL. The fractionation method using ethanol solvent is the best for the extraction of antioxidant compounds from V. amygdalina .","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"63 1","pages":"775-782"},"PeriodicalIF":0.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88262437","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 : 2020-08-25DOI: 10.13171/mjc10802008251507sk
S. Koudjina, W. G. Kanhounnon, Gaston A. Kpotin, Nobel Kouakou N’guessan, Guy Y. S. Atohoun
Optoelectronics properties as helical molecular fingerprints have been investigated on a set of Helicenes molecules, which form a particular class of compounds and exhibit both π-electron delocalization and chiral properties. In this paper, we investigate the IR and Raman signatures of four representative Helicenes: Hexahilicene (Hexa-Helicene), tetrathia-[7]-helicene (Helicene-4S), and its pyrrole (Helicene-4N) and furan analogs (Helicene-4O), under the visible wavelength of 532 nm. Correctly, the impact of the method of calculation on these signatures has been pointed out. The simulation of the IR and Raman signatures involves two different steps: the evaluation of the vibrational frequencies and normal modes and the calculation of the Cartesian derivatives of electric properties. While most of the time, all the quantities are evaluated with a single method, we believe that this should not be the case since both steps have not the same requirements in terms of computational methods. Density functional theory has been then used with different exchange-correlation functional and Coupled Perturbed Time-Dependent Hartree-Fock (CP-TDHF) for the electric properties investigations. It comes out of the results that B3LYP, B3P86, and PBE0, reproduces better experimental spectra. The impact of the electron correlation as view one the XC functional on the evaluation of the Cartesian derivatives of the electric properties were found to be somewhat limited. Overall, the most crucial point is to have an accurate description of the normal vibrational modes via the choice of appropriate XC functionals, which describe the experiment results.
{"title":"Conceptions of Vibrational Signatures Based on Chiral/Helical Functionalized Helicenes Nanostructures: Analyzed of Normal and Identical Modes","authors":"S. Koudjina, W. G. Kanhounnon, Gaston A. Kpotin, Nobel Kouakou N’guessan, Guy Y. S. Atohoun","doi":"10.13171/mjc10802008251507sk","DOIUrl":"https://doi.org/10.13171/mjc10802008251507sk","url":null,"abstract":"Optoelectronics properties as helical molecular fingerprints have been investigated on a set of Helicenes molecules, which form a particular class of compounds and exhibit both π-electron delocalization and chiral properties. In this paper, we investigate the IR and Raman signatures of four representative Helicenes: Hexahilicene (Hexa-Helicene), tetrathia-[7]-helicene (Helicene-4S), and its pyrrole (Helicene-4N) and furan analogs (Helicene-4O), under the visible wavelength of 532 nm. Correctly, the impact of the method of calculation on these signatures has been pointed out. The simulation of the IR and Raman signatures involves two different steps: the evaluation of the vibrational frequencies and normal modes and the calculation of the Cartesian derivatives of electric properties. While most of the time, all the quantities are evaluated with a single method, we believe that this should not be the case since both steps have not the same requirements in terms of computational methods. Density functional theory has been then used with different exchange-correlation functional and Coupled Perturbed Time-Dependent Hartree-Fock (CP-TDHF) for the electric properties investigations. It comes out of the results that B3LYP, B3P86, and PBE0, reproduces better experimental spectra. The impact of the electron correlation as view one the XC functional on the evaluation of the Cartesian derivatives of the electric properties were found to be somewhat limited. Overall, the most crucial point is to have an accurate description of the normal vibrational modes via the choice of appropriate XC functionals, which describe the experiment results.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"32 1","pages":"761-774"},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84519991","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 : 2020-08-24DOI: 10.13171/mjc10802008241482rrm
Román Rodriguez-Maecker, Isabel Pazmiño-Mayorga, J. López-Ortega, Liseth Chacón-Molina, E. Vyhmeister
A microwave hydrothermal treatment was used for the chemical production of lactic acid from alginate extracted from the brown seaweed Padina Durvillaei , collected in the coastal area of Ecuador. The microwave hydrothermal treatment was studied through a response surface methodology based on the Box-Behnken design, using temperature, reaction time, and catalyst concentration as the manipulated variables and the yield as a response factor. The characterization of alginate was performed by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). The lactic acid produced was quantified using Gas Chromatography - Ion Mobility Spectrometry (GC-IMS). The results show that temperature and catalyst concentration played the most critical roles in alginate extraction and lactic acid production. The optimal experimental conditions for alginate extraction from brown seaweed were: temperature = 92.91°C, time = 110.81 min and catalyst (Na 2 CO 3 ) concentration = 2.60%, with a yield = 29.19%. Although the experimental evidence indicates a positive influence of microwaves' use on the production of lactic acid from alginate through hydrothermal treatment, a new study considering temperatures above 220°C and reaction times below 60 min should be developed.
{"title":"Study of microwave hydrothermal production of lactic acid from seaweed-derived alginate using a response surface methodology based on the Box-Behnken design","authors":"Román Rodriguez-Maecker, Isabel Pazmiño-Mayorga, J. López-Ortega, Liseth Chacón-Molina, E. Vyhmeister","doi":"10.13171/mjc10802008241482rrm","DOIUrl":"https://doi.org/10.13171/mjc10802008241482rrm","url":null,"abstract":"A microwave hydrothermal treatment was used for the chemical production of lactic acid from alginate extracted from the brown seaweed Padina Durvillaei , collected in the coastal area of Ecuador. The microwave hydrothermal treatment was studied through a response surface methodology based on the Box-Behnken design, using temperature, reaction time, and catalyst concentration as the manipulated variables and the yield as a response factor. The characterization of alginate was performed by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). The lactic acid produced was quantified using Gas Chromatography - Ion Mobility Spectrometry (GC-IMS). The results show that temperature and catalyst concentration played the most critical roles in alginate extraction and lactic acid production. The optimal experimental conditions for alginate extraction from brown seaweed were: temperature = 92.91°C, time = 110.81 min and catalyst (Na 2 CO 3 ) concentration = 2.60%, with a yield = 29.19%. Although the experimental evidence indicates a positive influence of microwaves' use on the production of lactic acid from alginate through hydrothermal treatment, a new study considering temperatures above 220°C and reaction times below 60 min should be developed.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"29 1","pages":"752-760"},"PeriodicalIF":0.0,"publicationDate":"2020-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85593724","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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