Science Journal of Chemistry最新文献

Use of Zircon in the Physicochemical Process of Defluorination of Hyperfluorinated Brackish Water from the Diouroup Borehole (Senegal) 在对来自 Diouroup 井眼的高氟咸水进行脱氟的物理化学过程中使用锆石（塞内加尔）

Science Journal of Chemistry Pub Date : 2024-07-02 DOI: 10.11648/j.sjc.20241204.11

Alioune Ly, A. Coly, Ndiouga Camara, Baba Ngom, D. Gassama, S. Tamba

{"title":"Use of Zircon in the Physicochemical Process of Defluorination of Hyperfluorinated Brackish Water from the Diouroup Borehole (Senegal)","authors":"Alioune Ly, A. Coly, Ndiouga Camara, Baba Ngom, D. Gassama, S. Tamba","doi":"10.11648/j.sjc.20241204.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20241204.11","url":null,"abstract":"In phosphate-producing countries (United States, Commonwealth of Independent States, North and West Africa including Senegal), the presence of phosphate ores (hydroxyapatite) is often associated with that of fluorine ores (fluoro apatite). In these regions, water from confined aquifers may have excessive fluoride contents. While the potability standards in tropical climates are 0.7 mg/L at a temperature of 25°C In the central zone of Senegal, hyperfluorinated brackish water constitutes a public health problem. It is in this context that it was decided to make our contribution to the purification of drinking water in this area. In our study, we used as an element in the physicochemical defluorination process. The results obtained, by this physicochemical treatment by filtration on the zircon column, showed overall a reduction in fluoride contents of 67.55% (i.e. from 6.41 mg/L to 2.08 mg/L) in chlorides of 10.44%. We can therefore affirm that zircon can be used for the defluorination of hyperfluorinated brackish waters. However, these results can be improved by lowering the pH of the water before treatment and increasing the retention time.\u0000","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Java Script Programs for Calculation of Dihedral Angles with Manifold Equations 用曲面方程计算二面角的 Java 脚本程序

Science Journal of Chemistry Pub Date : 2024-06-03 DOI: 10.11648/j.sjc.20241203.11

C. Mitan, Emerich Bartha, Petru A. Filip, C. Draghici, M. Cǎproiu, R. Moriarty

{"title":"Java Script Programs for Calculation of Dihedral Angles with Manifold Equations","authors":"C. Mitan, Emerich Bartha, Petru A. Filip, C. Draghici, M. Cǎproiu, R. Moriarty","doi":"10.11648/j.sjc.20241203.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20241203.11","url":null,"abstract":"Java Script programs for calculation dihedral angles from NMR data with manifold equations of 3-Sphere approach: rectangle, Villarceau circles of cyclide (Torus – Dupin Cyclide), polar equations, Euler-Conic. Manifolds are curves or surface in higher dimension used for calculation of dihedral angles under wave character of NMR data, carbon and/or proton chemical shift δXn[ppm] and vicinal coupling constant 3JHnHn+1[Hz]. 3-Sphere approach for calculation of the dihedral angles from NMR data in four steps: 1. Prediction, or more exactly calculation of the dihedral angles from vicinal coupling constant with trigonometric equations, 2. Calculation of the dihedral angles from manifold equations; 3. Building units from angle calculated with one of the manifold equations; 4. Calculation the vicinal coupling constant of the manifold dihedral angle. In this paper are presented Java Script programs of step 2 and from step 3 only the Java Script program for calculation of seven sets angles. The bond distances lCnCn+1[A0] between two atoms of carbon are under different polar equations (i.e. limaçons or cardioid, rose or lemniscale), our expectation was to find different manifold equations for calculation the best angle, differences are smaller but can be find sometimes a preferred one for a vicinal coupling constant. 3-Sphere approach has the advantages of calculation from vicinal angle or/and chemical shift the dihedral angle, tetrahedral angle and the bond distance lCnCn+1[A0], with application on conformational and configurational analysis.\u0000","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141388961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Olive Mill Wastewaters Spreading on Agricultural Land: Results and Practical Management 农田中的橄榄树废水：结果与实际管理

Science Journal of Chemistry Pub Date : 2024-05-17 DOI: 10.11648/j.sjc.20241202.12

Siwar Abdennbi, K. Gargouri, M. Abichou, Ali Rhouma, Salwa Magdich, Nabil Soua, Anoir Jribi, Saïd Jilani, B. Rouina

{"title":"Olive Mill Wastewaters Spreading on Agricultural Land: Results and Practical Management","authors":"Siwar Abdennbi, K. Gargouri, M. Abichou, Ali Rhouma, Salwa Magdich, Nabil Soua, Anoir Jribi, Saïd Jilani, B. Rouina","doi":"10.11648/j.sjc.20241202.12","DOIUrl":"https://doi.org/10.11648/j.sjc.20241202.12","url":null,"abstract":"Rich in water (88 to 95%), organic matter (6 to 14%) and mineral matter (1.5 to 4%), the olive mill wastewater or liquid effluent from the olive processing industry represents a certain fertilizer source. Four treatments (Control, 50, 100 and 200 m3 ha-1 of OMWW) with an annual spreading of fresh OMWW, are applied to evaluate the effects of direct spreading of this by-product on the soil and the plant. From the first application, the level of organic matter changed significantly compared to the control soil without OMWW. In fact, three months after spreading, the respective levels of this substance increased from 0.42% in the control plot, to 0.91%, 1.02% and 1.47% respectively, for the spreading doses of 50, 100 or 200 m3 ha-1. After several years, these same rates are only 0.84%, 0.91% and 0.95% for the respective doses of 50, 100 and 200 m3 ha-1, indicating an intense activity of mineralization of organic matter under the effect of the soil microflora whose number has increased. The improvement in mineral status consequently improved the growth of olive groves with application doses of 50 and 100 m3 ha-1. A decline in olive production was recorded with the dose 200 m3 ha-1, which could be explained by the inhibitory effect probably resulting from a slight toxic action of polyphenols accumulated in the soil. Finally, it should be noted that the results of this research led to the development of Decree No. 1308/2013 of February 26, 2013, authorizing the spreading of 50 m3 ha 1 of fresh vegetable water.\u0000","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141126380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enzyme Urease Activity and Phytochemical Investigation of the Leaves of Baissea Mortehanii (Apocynaceae) 白花蛇舌草叶的尿素酶活性和植物化学研究

Science Journal of Chemistry Pub Date : 2024-02-21 DOI: 10.11648/j.sjc.20241201.13

Ngah Lidwine, Essombe Malolo Fanny-Aimee, Ngo Nyobe Biwole Caroline, Nko’o Henri Julien, W. D. T. Tsopgni, E. Gisèle, J. Wansi, Kamdem Waffo, Ndom Jean Claude, M. Emmanuel

{"title":"Enzyme Urease Activity and Phytochemical Investigation of the Leaves of Baissea Mortehanii (Apocynaceae)","authors":"Ngah Lidwine, Essombe Malolo Fanny-Aimee, Ngo Nyobe Biwole Caroline, Nko’o Henri Julien, W. D. T. Tsopgni, E. Gisèle, J. Wansi, Kamdem Waffo, Ndom Jean Claude, M. Emmanuel","doi":"10.11648/j.sjc.20241201.13","DOIUrl":"https://doi.org/10.11648/j.sjc.20241201.13","url":null,"abstract":"The phytochemical investigation of a previously unstudied species of the genus Apocynaceae, Baissea mortehanii de Wild was undertaken and eight known secondary metabolites were isolated from leaves of this plant including one alkaloid, N-Feruloyltryptamine (1); one aromatic ester, Dibutyl phthalate (2); two flavonoids, Genistein (3) and Gerontoisoflavone A (4), four sterols, β-Sitosterol (5), Sitosterol-3-O-β-D-glucopyranoside (6), Stigmasterol (7) and Stigmasterol-3-O-β-D glucopyranoside (8). The structures of compounds were determined by means of spectroscopic methods :NMR analysis (1H and13C NMR, 1H-1H-COSY, HSQC, HMBC), spectrometric methods such as UV, IR, ESI-MS, EI, and by comparing their data with those reported in the literature. All the isolated compounds were tested for their potential to inhibit the enzyme urease. Urease activity was determined by measuring ammonia production using the indophenol method and thiourea was used as standard inhibitor of urease. Compounds 5 and 7 showed the best urease inhibition with an IC50 value 17. 2 and 18.5 µM respectively, which is higher than that of the potent inhibitor, thiourea (IC50 = 21.5 µM); Compounds 3, 4, 6 and 8 showed a good urease inhibition with an IC50 value 26.9, 29.7, 32.8 and 34.3 µM respectively; Compounds 1 and 2 showed a moderate urease inhibition with an IC50 value 49.1 and 46.8 µM respectively.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140445216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compound Identification by HPLC-ESI-Q-TOF-MS/ MS Analysis of the Dichloromethane Fraction of Hyptis suaveolens Leaves After Extraction of the Essential Oil 通过 HPLC-ESI-Q-TOF-MS/ MS 分析萃取精油后的 Hyptis suaveolens 叶二氯甲烷馏分来鉴定化合物

Science Journal of Chemistry Pub Date : 2024-02-01 DOI: 10.11648/sjc.20241201.11

Brahima Soumahoro, Gouegoui Serge-Pacôme Bohui, Mabintou Kalo, Losseyni Kanaté, Barthélémy Attioua, Yaya Soro

引用次数: 0

Analysis by LC-Ms/Ms of Drugs Sold in the Markets of Kara and Lome 通过 LC-Ms/Ms 对卡拉和洛美市场上销售的药物进行分析

Science Journal of Chemistry Pub Date : 2024-02-01 DOI: 10.11648/sjc.20241201.12

Bakaï Marie-France

引用次数: 0

Compound Identification by HPLC-ESI-Q-TOF-MS/ MS Analysis of the Dichloromethane Fraction of Hyptis suaveolens Leaves After Extraction of the Essential Oil 通过 HPLC-ESI-Q-TOF-MS/ MS 分析萃取精油后的 Hyptis suaveolens 叶二氯甲烷馏分来鉴定化合物

Science Journal of Chemistry Pub Date : 2024-02-01 DOI: 10.11648/sjc.20241201.11

Brahima Soumahoro, Gouegoui Serge-Pacôme Bohui, Mabintou Kalo, Losseyni Kanaté, Barthélémy Attioua, Yaya Soro

引用次数: 0

Analysis by LC-Ms/Ms of Drugs Sold in the Markets of Kara and Lome 通过 LC-Ms/Ms 对卡拉和洛美市场上销售的药物进行分析

Science Journal of Chemistry Pub Date : 2024-02-01 DOI: 10.11648/sjc.20241201.12

Bakaï Marie-France

引用次数: 0

Graph Flux Intensity and Electromagnetic Wave on 3-sphere Approach 在 3 球体上绘制通量强度和电磁波图的方法

Science Journal of Chemistry Pub Date : 2023-11-21 DOI: 10.11648/j.sjc.20231106.12

C. Mitan, Emerich Bartha, Petru A. Filip, M. Cǎproiu, C. Draghici, Robert Michael Moriarty

引用次数: 0

Osidic Bridges of Amylose and Amylopectin Degradations by Water Molecules: Formulation of a Mechanism 水分子降解直链淀粉和支链淀粉的奥西迪桥：机制的形成

Science Journal of Chemistry Pub Date : 2023-11-09 DOI: 10.11648/j.sjc.20231106.11

N’guessan Boka Robert, Ablé Anoh Valentin, Bamba El Hadji Sawaliho

引用次数: 0