Pub Date : 2021-03-04DOI: 10.13171/MJC02103041563SK
S. Kharacha, M. Belkhaouda, L. Bammou, A. Batah, I. Bazzi, R. Salghi, S. Issami, M. Hilali
L-Cysteine (L-Cyst) was tested as a corrosion inhibitor of 3003 aluminum alloy (AA3003) in Na 2 CO 3 0.1M + NaCl 1M solution. The inhibition action of this inhibitor was studied by using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and cyclic voltammetry (CV) techniques. The temperature effect on the inhibition efficiency was studied in the range from 298 to 328K, and the values of activation thermodynamic parameters were calculated and explained. Experiment results show that inhibition efficiency increases with the increase of L-Cysteine concentration, and its inhibition efficiency reaches 92% at 10 −3 M. The inhibition efficiency decreases slightly with the elevation of a corrosive medium temperature. Analysis of the polarization curves revealed that L-Cyst is considered a mixed inhibitor. The results from electrochemical measurements and theoretical calculations are in good agreement. The morphological changes of the surface during corrosion, in the presence and absence of the inhibitor, were studied by scanning electron microscopy (SEM).
{"title":"Experimental and theoretical study of adsorption of L-cysteine on the passivation and corrosion inhibition of aluminum alloy in alkaline environment","authors":"S. Kharacha, M. Belkhaouda, L. Bammou, A. Batah, I. Bazzi, R. Salghi, S. Issami, M. Hilali","doi":"10.13171/MJC02103041563SK","DOIUrl":"https://doi.org/10.13171/MJC02103041563SK","url":null,"abstract":"L-Cysteine (L-Cyst) was tested as a corrosion inhibitor of 3003 aluminum alloy (AA3003) in Na 2 CO 3 0.1M + NaCl 1M solution. The inhibition action of this inhibitor was studied by using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and cyclic voltammetry (CV) techniques. The temperature effect on the inhibition efficiency was studied in the range from 298 to 328K, and the values of activation thermodynamic parameters were calculated and explained. Experiment results show that inhibition efficiency increases with the increase of L-Cysteine concentration, and its inhibition efficiency reaches 92% at 10 −3 M. The inhibition efficiency decreases slightly with the elevation of a corrosive medium temperature. Analysis of the polarization curves revealed that L-Cyst is considered a mixed inhibitor. The results from electrochemical measurements and theoretical calculations are in good agreement. The morphological changes of the surface during corrosion, in the presence and absence of the inhibitor, were studied by scanning electron microscopy (SEM).","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"28 1","pages":"133-145"},"PeriodicalIF":0.0,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89605261","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 : 2021-02-27DOI: 10.13171/MJC02102271568FEE
Fatima Ezzahra El oumari, D. Bousta, Andriy Grafov, T. S. Houssaini
Urolithiasis is a recurrent pathology manifested by the stone formation in the urinary system; it has long been treated in traditional medicine by plant remedies. Several studies have provided the efficacy of medicinal plants as well as their chemical compounds against stone formation. The present work aims to summarize the antiurolithiatic effect of phytochemicals, including quercetin, rutin, catechin, diosmin, and thymoquinone. In this context, various databases, including PubMed, Science Direct, Scopus, and google scholar, were searched using keywords like antiurolithiatic bioactive molecules and chemistry of phytomolecules.The results confirmed that phytochemicals, including particularly flavonoid molecules, could be effective against lithogenesis via different strategies such as decreasing the binding between crystals and cells, decreasing the growth of crystals, and increasing magnesium level. Nevertheless, more studies are required, such as determination of toxicity and clinical studies. This review may help researchers achieve more results about the mechanism and the side effects of phytochemicals administration.
{"title":"Phytomolecules investigated for the prevention and treatment of urinary stones","authors":"Fatima Ezzahra El oumari, D. Bousta, Andriy Grafov, T. S. Houssaini","doi":"10.13171/MJC02102271568FEE","DOIUrl":"https://doi.org/10.13171/MJC02102271568FEE","url":null,"abstract":"Urolithiasis is a recurrent pathology manifested by the stone formation in the urinary system; it has long been treated in traditional medicine by plant remedies. Several studies have provided the efficacy of medicinal plants as well as their chemical compounds against stone formation. The present work aims to summarize the antiurolithiatic effect of phytochemicals, including quercetin, rutin, catechin, diosmin, and thymoquinone. In this context, various databases, including PubMed, Science Direct, Scopus, and google scholar, were searched using keywords like antiurolithiatic bioactive molecules and chemistry of phytomolecules.The results confirmed that phytochemicals, including particularly flavonoid molecules, could be effective against lithogenesis via different strategies such as decreasing the binding between crystals and cells, decreasing the growth of crystals, and increasing magnesium level. Nevertheless, more studies are required, such as determination of toxicity and clinical studies. This review may help researchers achieve more results about the mechanism and the side effects of phytochemicals administration.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88254318","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 : 2021-02-22DOI: 10.13171/MJC02102221569MLS
Mohammed Senhaji, A. Hafnaoui, M. Khouloud, Asmae El Agri, M. E. Asri, Ahmed Boulahna
The demand for fertilizers in the agricultural sector has increased drastically with the world's exponential growth. Moreover, solid granular fertilizers remain by far the most requested. The granular fertilizers production presents several kinds of problems, especially the ternary fertilizers family. The caking is a severe issue that affects granules' physical quality, particularly during storage and transport. It makes them unsuitable for their intended uses. In this work, a new anti-caking agent has been developed to cope with the granular fertilizer caking problem and improve their physical quality. First of all, thanks to the screening design of Plackett-Burman, the effect of seven anti-caking components on the phosphate fertilizer caking trend was evaluated only by eight trials. Next, a mixture design was used to formulate a new anti-caking agent from three components (glycerol, calcium carbonate, and molasses). The screening design was chosen as the most effective components. Finally, from the mixture design results, a special cubic model was postulated and statically validated. The model delivered a wide range of compositions formulated from the three components mentioned above, capable of reducing the caking tendency of ternary granular fertilizer.
{"title":"Screening and mixture design applied to formulate anti-caking compositions for reducing the caking tendency of granular phosphate fertilizers","authors":"Mohammed Senhaji, A. Hafnaoui, M. Khouloud, Asmae El Agri, M. E. Asri, Ahmed Boulahna","doi":"10.13171/MJC02102221569MLS","DOIUrl":"https://doi.org/10.13171/MJC02102221569MLS","url":null,"abstract":"The demand for fertilizers in the agricultural sector has increased drastically with the world's exponential growth. Moreover, solid granular fertilizers remain by far the most requested. The granular fertilizers production presents several kinds of problems, especially the ternary fertilizers family. The caking is a severe issue that affects granules' physical quality, particularly during storage and transport. It makes them unsuitable for their intended uses. In this work, a new anti-caking agent has been developed to cope with the granular fertilizer caking problem and improve their physical quality. First of all, thanks to the screening design of Plackett-Burman, the effect of seven anti-caking components on the phosphate fertilizer caking trend was evaluated only by eight trials. Next, a mixture design was used to formulate a new anti-caking agent from three components (glycerol, calcium carbonate, and molasses). The screening design was chosen as the most effective components. Finally, from the mixture design results, a special cubic model was postulated and statically validated. The model delivered a wide range of compositions formulated from the three components mentioned above, capable of reducing the caking tendency of ternary granular fertilizer.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"31 1","pages":"115-125"},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88170865","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 : 2021-02-12DOI: 10.13171/MJC02102121561SAA
A. M. Chahad, S. A. Adey, A. Chatté, Zapfack Louis, M. Dijoux‐Franca
Based on a previous ethnobotanical survey, Terminalia macroptera Guill. & Perr. was selected as its heartwood is traditionally used for infections treatment and as mosquito repellent in the province of Ouaddai (Chad). In our course for a better knowledge of this medicinal plant which could be developed as phytomedicine, it is of great interest to subsequently characterize the chemical profile and bioactivities of this plant. In the present study we develop an Ultrahigh-performance liquid chromatography with diode array detection coupled to electrospray ionization and quadrupole time-of-flight (UHPLC-DAD-ESI/QTOF) technique to characterized on line potentially bioactive compounds. Thirteen compounds were identified in active extracts and fractions from Terminalia macroptera Guill. & Perr. heartwood, namely gallic and ellagic acids derivatives, 23- O -galloyl-terminolic acid, 23- O -galloyl arjunolic acid, 4,4’-dihydroxy-Z-stilbene- O -rutinoside and 3,5,4’-trihydroxy-Z-stilbene- O -rutinoside. Antibacterial properties were evaluated against sensitive and resistant Staphylococcus aureus strains and antioxidant activities using 1,1-diphenyl-2-picryl-hydrazyl (DPPH). Stilbene derivatives, 23- O -galloyl-terminolic acid and 23- O -galloyl arjunolic acid are newly reported in T. macroptera Guill. & Perr.
基于前人的民族植物学调查，大翅Terminalia macroptera Guill。&穗青葱。之所以选择它，是因为它的心材传统上用于治疗感染，并在(乍得)Ouaddai省用作驱蚊剂。为了更好地了解这种可开发为植物药的药用植物，随后对这种植物的化学特征和生物活性进行表征是非常有意义的。在本研究中，我们建立了一种二极管阵列检测耦合电喷雾电离和四极杆飞行时间(UHPLC-DAD-ESI/QTOF)的超高效液相色谱技术来在线表征潜在的生物活性化合物。从大翅Terminalia macroptera Guill活性提取物和组分中鉴定出13个化合物。&穗青葱。心材，即没食子酸和鞣花酸衍生物，23- O -没食子酸-端果酸，23- O -没食子酸- arjunolic酸，4,4 ' -二羟基- z -stilbene- O - rutino苷和3,5,4 ' -三羟基- z -stilbene- O - rutino苷。采用1,1-二苯基-2-苦酰基-肼(DPPH)对金黄色葡萄球菌敏感和耐药菌株进行抑菌性能和抗氧化活性评价。二苯乙烯衍生物，23- O -没食子酰基端果酸和23- O -没食子酰基arjunolic酸是新报道的。&穗青葱。
{"title":"Chemical analysis and Biological properties of Terminalia macroptera Guill. & Perr. from Eastern Chad","authors":"A. M. Chahad, S. A. Adey, A. Chatté, Zapfack Louis, M. Dijoux‐Franca","doi":"10.13171/MJC02102121561SAA","DOIUrl":"https://doi.org/10.13171/MJC02102121561SAA","url":null,"abstract":"Based on a previous ethnobotanical survey, Terminalia macroptera Guill. & Perr. was selected as its heartwood is traditionally used for infections treatment and as mosquito repellent in the province of Ouaddai (Chad). In our course for a better knowledge of this medicinal plant which could be developed as phytomedicine, it is of great interest to subsequently characterize the chemical profile and bioactivities of this plant. In the present study we develop an Ultrahigh-performance liquid chromatography with diode array detection coupled to electrospray ionization and quadrupole time-of-flight (UHPLC-DAD-ESI/QTOF) technique to characterized on line potentially bioactive compounds. Thirteen compounds were identified in active extracts and fractions from Terminalia macroptera Guill. & Perr. heartwood, namely gallic and ellagic acids derivatives, 23- O -galloyl-terminolic acid, 23- O -galloyl arjunolic acid, 4,4’-dihydroxy-Z-stilbene- O -rutinoside and 3,5,4’-trihydroxy-Z-stilbene- O -rutinoside. Antibacterial properties were evaluated against sensitive and resistant Staphylococcus aureus strains and antioxidant activities using 1,1-diphenyl-2-picryl-hydrazyl (DPPH). Stilbene derivatives, 23- O -galloyl-terminolic acid and 23- O -galloyl arjunolic acid are newly reported in T. macroptera Guill. & Perr.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"237 1","pages":"104-114"},"PeriodicalIF":0.0,"publicationDate":"2021-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72699959","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 : 2021-02-02DOI: 10.13171/MJC02102021555MNLNM
F. Nguimatsia, S. B. Kenmogne, M.N.L. Ngo-Mback, J. Kouamouo, Léa Larissa Nzenti Tchuitio, Yannick Kevin Melogmo Dongmo, P. M. J. Dongmo
To control bacterial infections, we proposed evaluating the antibacterial activities and modes of action of Aeollanthus heliotropioides essential oil and its hydroethanolic extract. Solvent extracts and essential oil were obtained from the aromatic plant's aerial parts by hydroethanolic maceration and hydro-distillation. The analyses of the chemical composition were performed using gas chromatography coupled with mass spectrometry. The microdilution method evaluated the in vitro antibacterial potential of the essential oil and solvent extracts . The Inhibition of biofilms formation was carried out using a colorimetric biofilm microdilution assay with crystal violet as a dye. The effect of extract and essential oil on the release of nucleic acids was performed using a spectrophotometric method. The time-kill kinetic assay was assessed for hydroethanolic extracts and essential oil. The extraction yield was 0.1%, and the major compounds identified in the essential oil were linalool (43.47%) and cis-α-farnesene (42.67%). The phytochemical screening revealed flavonoids, saponins, phenols, triterpenes, catechin tannins, and quinones. Minimum Inhibitory Concentrations (MICs) ranged from 2.08 mg/mL to 10 mg/mL. Concerning the modes of action, the essential oil showed its bactericidal effect at 2 hours. The reduction of Escherichia coli biofilms formation was found at 0.21 mg/mL. The essential oil treatments resulted in a release of nucleic acids at a concentration of 2.1 mg/mL. These results justify using the essential oil and hydroethanolic extracts of Aeollanthus heliotropioides as a potential source of molecules with antibacterial activity.
{"title":"Antibacterial activities of the essential oil and hydroethanolic extract from Aeollanthus heliotropioides Oliv","authors":"F. Nguimatsia, S. B. Kenmogne, M.N.L. Ngo-Mback, J. Kouamouo, Léa Larissa Nzenti Tchuitio, Yannick Kevin Melogmo Dongmo, P. M. J. Dongmo","doi":"10.13171/MJC02102021555MNLNM","DOIUrl":"https://doi.org/10.13171/MJC02102021555MNLNM","url":null,"abstract":"To control bacterial infections, we proposed evaluating the antibacterial activities and modes of action of Aeollanthus heliotropioides essential oil and its hydroethanolic extract. Solvent extracts and essential oil were obtained from the aromatic plant's aerial parts by hydroethanolic maceration and hydro-distillation. The analyses of the chemical composition were performed using gas chromatography coupled with mass spectrometry. The microdilution method evaluated the in vitro antibacterial potential of the essential oil and solvent extracts . The Inhibition of biofilms formation was carried out using a colorimetric biofilm microdilution assay with crystal violet as a dye. The effect of extract and essential oil on the release of nucleic acids was performed using a spectrophotometric method. The time-kill kinetic assay was assessed for hydroethanolic extracts and essential oil. The extraction yield was 0.1%, and the major compounds identified in the essential oil were linalool (43.47%) and cis-α-farnesene (42.67%). The phytochemical screening revealed flavonoids, saponins, phenols, triterpenes, catechin tannins, and quinones. Minimum Inhibitory Concentrations (MICs) ranged from 2.08 mg/mL to 10 mg/mL. Concerning the modes of action, the essential oil showed its bactericidal effect at 2 hours. The reduction of Escherichia coli biofilms formation was found at 0.21 mg/mL. The essential oil treatments resulted in a release of nucleic acids at a concentration of 2.1 mg/mL. These results justify using the essential oil and hydroethanolic extracts of Aeollanthus heliotropioides as a potential source of molecules with antibacterial activity.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"11 1","pages":"95-103"},"PeriodicalIF":0.0,"publicationDate":"2021-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87389181","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 : 2021-01-21DOI: 10.13171/MJC02101211565LK
H. Zrouri, Amine Elbouzidi, M. Bouhrim, N. Bencheikh, Loubna Kharchoufa, S. Ouahhoud, Hayat Ouassou, Soufiane El Assri, M. Choukri
In Morocco, Raphanus sativus is a widespread traditional medicinal plant used to treat various kidney diseases such as nephropathy. Objective : The present study aims to evaluate the protective effect of the R. sativus aqueous extract against the gentamicin-induced acute nephrotoxicity in rats. Methods : Rats were randomly separated into four groups (n=6; ♂/ ♀=1). The control group was treated only with distilled water (10 mL/kg; p.o ). The gentamicin group was treated with distilled water (10 mL/kg; p.o ) and injected intraperitoneally by the gentamicin (80 mg/kg; i.p ). R. sativus groups were treated with the aqueous extracts of this plant at a dose of (200 or 400 mg/kg; p.o ) and injected by the gentamicin (80 mg/kg; i.p ). The plasma Creatinine, Urea, Uric Acid, Albumin, Total Protein, Alanine transaminase, Aspartate transaminase, and Calcium levels were measured. The urinary creatinine, urinary Calcium, urinary volume, water intake, creatinine clearance, body weight gain, relative right kidney weight, and kidney malondialdehydes were determined. Results : This study showed that the daily pretreatment with R. sativus aqueous extract at two doses of 200 and 400 mg/kg, p.o prevented the rats from the gentamicin-induced nephrotoxicity. Moreover, the R. sativus aqueous extract showed a high amount of polyphenols and flavonoids and a significant antioxidant activity. Conclusion : R. sativus aqueous extract, as a novel natural product, may have preventive properties against gentamicin-induced nephrotoxicity in rats. The present study describes new areas of investigation to introduce better therapeutic agents for renal disorders and dysfunction.
{"title":"Phytochemical analysis, antioxidant activity, and nephroprotective effect of the Raphanus sativus aqueous extract","authors":"H. Zrouri, Amine Elbouzidi, M. Bouhrim, N. Bencheikh, Loubna Kharchoufa, S. Ouahhoud, Hayat Ouassou, Soufiane El Assri, M. Choukri","doi":"10.13171/MJC02101211565LK","DOIUrl":"https://doi.org/10.13171/MJC02101211565LK","url":null,"abstract":"In Morocco, Raphanus sativus is a widespread traditional medicinal plant used to treat various kidney diseases such as nephropathy. Objective : The present study aims to evaluate the protective effect of the R. sativus aqueous extract against the gentamicin-induced acute nephrotoxicity in rats. Methods : Rats were randomly separated into four groups (n=6; ♂/ ♀=1). The control group was treated only with distilled water (10 mL/kg; p.o ). The gentamicin group was treated with distilled water (10 mL/kg; p.o ) and injected intraperitoneally by the gentamicin (80 mg/kg; i.p ). R. sativus groups were treated with the aqueous extracts of this plant at a dose of (200 or 400 mg/kg; p.o ) and injected by the gentamicin (80 mg/kg; i.p ). The plasma Creatinine, Urea, Uric Acid, Albumin, Total Protein, Alanine transaminase, Aspartate transaminase, and Calcium levels were measured. The urinary creatinine, urinary Calcium, urinary volume, water intake, creatinine clearance, body weight gain, relative right kidney weight, and kidney malondialdehydes were determined. Results : This study showed that the daily pretreatment with R. sativus aqueous extract at two doses of 200 and 400 mg/kg, p.o prevented the rats from the gentamicin-induced nephrotoxicity. Moreover, the R. sativus aqueous extract showed a high amount of polyphenols and flavonoids and a significant antioxidant activity. Conclusion : R. sativus aqueous extract, as a novel natural product, may have preventive properties against gentamicin-induced nephrotoxicity in rats. The present study describes new areas of investigation to introduce better therapeutic agents for renal disorders and dysfunction.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"89 1","pages":"84-94"},"PeriodicalIF":0.0,"publicationDate":"2021-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88204253","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 : 2021-01-14DOI: 10.13171/MJC02101141493KW
K. Wijaya, Susi Efrina Purba, W. Trisunaryanti, R. A. Pratika
The modification of natural zeolite has been conducted by dealumination and desilication using HCl and NaOH treatments as a catalyst for hydrocracking of used cooking oil into biogasoline. This research aimed to study the effect of dealumination and desilication on the natural zeolite activity and selectivity of a hydrocracking process. A variety of catalysts was prepared by applying 3, 6, and 9 M HCl in the dealumination of natural zeolite to produce DNZ(3-1), DNZ(3-2) DNZ(3-3), DNZ(6-1), DNZ(6-2), DNZ(6-3), DNZ(9-1), DNZ(9-2), and DNZ(9-3) catalysts and NaOH in the desilication of natural zeolite to obtain NZB catalyst. The results showed that the dealumination and the desilication treatments affected the liquid product conversion of used cooking oil from catalytic hydrocracking. The hydrocracking of used cooking oil with NZB catalyst produced the highest gasoline fuel conversion of 94.87%.
采用HCl和NaOH对天然沸石进行脱铝和脱硅改性，催化废食用油加氢裂化制生物汽油。研究了脱铝脱硅对天然沸石活性和加氢裂化选择性的影响。通过在天然沸石脱硅过程中应用3、6、9 M HCl制备多种催化剂，得到DNZ(3-1)、DNZ(3-2)、DNZ(3-3)、DNZ(6-1)、DNZ(6-2)、DNZ(6-3)、DNZ(9-1)、DNZ(9-2)、DNZ(9-3)催化剂，在天然沸石脱硅过程中应用NaOH得到NZB催化剂。结果表明，脱铝和脱硅处理对催化加氢裂化废油的液体产物转化率有影响。用NZB催化剂加氢裂化废食用油，汽油转化率最高，达94.87%。
{"title":"Dealuminated and Desilicated Natural Zeolite as a Catalyst for Hydrocracking of Used Cooking Oil into Biogasoline","authors":"K. Wijaya, Susi Efrina Purba, W. Trisunaryanti, R. A. Pratika","doi":"10.13171/MJC02101141493KW","DOIUrl":"https://doi.org/10.13171/MJC02101141493KW","url":null,"abstract":"The modification of natural zeolite has been conducted by dealumination and desilication using HCl and NaOH treatments as a catalyst for hydrocracking of used cooking oil into biogasoline. This research aimed to study the effect of dealumination and desilication on the natural zeolite activity and selectivity of a hydrocracking process. A variety of catalysts was prepared by applying 3, 6, and 9 M HCl in the dealumination of natural zeolite to produce DNZ(3-1), DNZ(3-2) DNZ(3-3), DNZ(6-1), DNZ(6-2), DNZ(6-3), DNZ(9-1), DNZ(9-2), and DNZ(9-3) catalysts and NaOH in the desilication of natural zeolite to obtain NZB catalyst. The results showed that the dealumination and the desilication treatments affected the liquid product conversion of used cooking oil from catalytic hydrocracking. The hydrocracking of used cooking oil with NZB catalyst produced the highest gasoline fuel conversion of 94.87%.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"34 1","pages":"75-83"},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75577314","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 : 2021-01-07DOI: 10.13171/MJC02101071553MYF
Muhammad Yunus Firdaus, Herlin Octaviani, H. Herlini, N. Fatimah, T. Mulyaningsih, Zachnaz Fairuuz, A. Nandiyanto
Nanocomposites are a new material discovery in the 21st century. One of the nanocomposite materials which are useful in life is epoxy-clay nanocomposites. Epoxy clay nanocomposites have a reasonably wide application in industrial fields such as aerospace, defense, automobile, etc. The purpose of writing this review is to conduct a literature review on mechanical properties in various Cloisite as a filler of Epoxy-clay Nanocomposites. There are several examples of cloisite, namely Cloisite 10A, Cloisite 15A, Cloisite 20A, Cloisite 25A, Cloisite 30B, and Cloisite 93A. Cloisite has the advantage of producing mechanical properties, especially in the tensile modulus and strength, which is more increased than conventional reinforcing materials. These methods' synthesis results were then characterized using TEM, SEM, XRD, and other tests to determine their mechanical properties. The material parameters resulting from nanocomposites' synthesis are well seen from the high Tensile strength and modulus values. The highest increase in mechanical properties was found in the cloisite 93A by the ultrasonic synthesis method or mechanical stirring based on the study results.
{"title":"Review: The Comparison of Clay Modifier (Cloisite Types) in Various Epoxy-Clay Nanocomposite Synthesis Methods","authors":"Muhammad Yunus Firdaus, Herlin Octaviani, H. Herlini, N. Fatimah, T. Mulyaningsih, Zachnaz Fairuuz, A. Nandiyanto","doi":"10.13171/MJC02101071553MYF","DOIUrl":"https://doi.org/10.13171/MJC02101071553MYF","url":null,"abstract":"Nanocomposites are a new material discovery in the 21st century. One of the nanocomposite materials which are useful in life is epoxy-clay nanocomposites. Epoxy clay nanocomposites have a reasonably wide application in industrial fields such as aerospace, defense, automobile, etc. The purpose of writing this review is to conduct a literature review on mechanical properties in various Cloisite as a filler of Epoxy-clay Nanocomposites. There are several examples of cloisite, namely Cloisite 10A, Cloisite 15A, Cloisite 20A, Cloisite 25A, Cloisite 30B, and Cloisite 93A. Cloisite has the advantage of producing mechanical properties, especially in the tensile modulus and strength, which is more increased than conventional reinforcing materials. These methods' synthesis results were then characterized using TEM, SEM, XRD, and other tests to determine their mechanical properties. The material parameters resulting from nanocomposites' synthesis are well seen from the high Tensile strength and modulus values. The highest increase in mechanical properties was found in the cloisite 93A by the ultrasonic synthesis method or mechanical stirring based on the study results.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"117 1","pages":"54-74"},"PeriodicalIF":0.0,"publicationDate":"2021-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79390340","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 : 2020-11-21DOI: 10.13171/mjc10902011211519mvm
M. Milyukin, M. Gorban
This article presents the monitoring results of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) in surface water of the Dnieper River for the period 2011–2019. Total levels of OCPs, PCBs and PAHs consist of 1,4–17,1; 2,8–57,2; and 7,5–378,6 ng/L, respectively. A significant increase in pollution levels was not identified. Research results of the disperse-phase distribution of these substances in water were also provided. Less than half of the total contents of pollutants were in the water phase. Average water-soluble parts of OCPs, PCBs, and PAHs accounted for 32, 42, and 44 %, respectively. It was shown that water-soluble parts of individual pollutants decrease with the increase in the coefficients of hydrophobicity of compounds. The clearest reliable, relevant correlation between water-soluble parts of individual congeners and coefficients of hydrophobicity was obtained for PCBs.
{"title":"Concentrations and regularities of disperse-phase distribution of organochlorine pesticides, polychlorinated biphenyls and polycyclic aromatic hydrocarbons in natural water","authors":"M. Milyukin, M. Gorban","doi":"10.13171/mjc10902011211519mvm","DOIUrl":"https://doi.org/10.13171/mjc10902011211519mvm","url":null,"abstract":"<div><p>This article presents the monitoring results of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs) in surface water of the Dnieper River for the period 2011–2019. Total levels of OCPs, PCBs and PAHs consist of 1,4–17,1; 2,8–57,2; and 7,5–378,6 ng/L, respectively. A significant increase in pollution levels was not identified. Research results of the disperse-phase distribution of these substances in water were also provided. Less than half of the total contents of pollutants were in the water phase. Average water-soluble parts of OCPs, PCBs, and PAHs accounted for 32, 42, and 44 %, respectively. It was shown that water-soluble parts of individual pollutants decrease with the increase in <span style=\"text-decoration: line-through;\">the</span> coefficients of hydrophobicity of compounds. The clearest reliable, relevant correlation between water-soluble parts of individual congeners and coefficients of hydrophobicity was obtained for PCBs.</p></div><p align=\"center\"><strong><br /></strong></p>","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"52 8_suppl 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87620158","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 : 2020-11-17DOI: 10.13171/mjc10902011171546rc
Benjamin Brandes, Sophie Hoenke, M. Türk, Björn Weber, H. Deigner, A. Al‐Harrasi, R. Csuk
3,5-Dimethoxy-benzaldehyde was used as a starting material to synthesize a central intermediate, 2hydroxy-4-methoxy-6-phenethylbenzoic acid that was converted very quickly and with good yields into amorfrutins A and B. Furthermore, this compound was also used as a starting material to synthesize a piperazinylrhodamine B conjugate. The latter compound showed good cytotoxicity (EC50 = 2.3–5.1 M) and promising selective cytotoxicity (S = 2.1–4.6) for human tumor cell lines as compared to non-malignant fibroblasts (NIH 3T3).
{"title":"A unified strategy for the synthesis of amorfrutins A and B and evaluation of their cytotoxicity","authors":"Benjamin Brandes, Sophie Hoenke, M. Türk, Björn Weber, H. Deigner, A. Al‐Harrasi, R. Csuk","doi":"10.13171/mjc10902011171546rc","DOIUrl":"https://doi.org/10.13171/mjc10902011171546rc","url":null,"abstract":"3,5-Dimethoxy-benzaldehyde was used as a starting material to synthesize a central intermediate, 2hydroxy-4-methoxy-6-phenethylbenzoic acid that was converted very quickly and with good yields into amorfrutins A and B. Furthermore, this compound was also used as a starting material to synthesize a piperazinylrhodamine B conjugate. The latter compound showed good cytotoxicity (EC50 = 2.3–5.1 M) and promising selective cytotoxicity (S = 2.1–4.6) for human tumor cell lines as compared to non-malignant fibroblasts (NIH 3T3).","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"15 1","pages":"858"},"PeriodicalIF":0.0,"publicationDate":"2020-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72967127","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：