Asian Journal of Chemical Sciences最新文献_第5页

Use of Some Metalferrites as Catalyst in Benzil-Benzilicacid Rearrangement Reaction 几种金属铁氧体在苯与苯甲酸重排反应中的催化作用

Asian Journal of Chemical Sciences Pub Date : 2023-07-18 DOI: 10.9734/ajocs/2023/v13i4246

Neha Godha, S. Ameta

引用次数: 0

Comparative Study of the Effect of Two Extraction Solvents on Polyphenols Content and Antioxidant Activity of Alstonia Boonei Bark 两种提取溶剂对桤木树皮多酚含量及抗氧化活性影响的比较研究

Asian Journal of Chemical Sciences Pub Date : 2023-07-15 DOI: 10.9734/ajocs/2023/v13i4245

Marielle Anastasie Zali, Martin Fonkoua, C. D. Daboy, William Arnold Tazon, David Goda, Dupon Ambamba Akamba, Jules Vidal Nanhah, J. Ngondi

{"title":"Comparative Study of the Effect of Two Extraction Solvents on Polyphenols Content and Antioxidant Activity of Alstonia Boonei Bark","authors":"Marielle Anastasie Zali, Martin Fonkoua, C. D. Daboy, William Arnold Tazon, David Goda, Dupon Ambamba Akamba, Jules Vidal Nanhah, J. Ngondi","doi":"10.9734/ajocs/2023/v13i4245","DOIUrl":"https://doi.org/10.9734/ajocs/2023/v13i4245","url":null,"abstract":"Oxidative stress (OS) is the imbalance between the generation of reactive oxygen species (ROS) and the body's antioxidant defenses in favor of ROS. ROS are chemical species that can be neutralized by natural phytochemicals like phenolic compounds present in medicinal plants and whose extraction depends on the solvent system used. Thus, the present study aimed to evaluate the effect of two extraction solvents on the polyphenols content and antioxidant activity of Alstonia boonei barks. For this, the bark of A. boonei were harvested, processed, dried and ground, then the powder was macerated in two solvent systems (water and water-ethanol). Subsequently, the quantitative phytochemical analysis of the different extractions was done by evaluating total polyphenols content (TPC), total flavonoids content (TFC) and alkaloids; followed by an in vitro evaluation of the antioxidants activity through radicals scavenging (DPPH and NO.) and the reducing power of ferric iron to ferrous iron. The relationship between antioxidant potential (DPPH, NO and FRAP) and polyphenols (total polyphenols and total flavonoids) was investigated using simple linear regression. It appears that the aqueous extract allowed better extraction of phenolic compounds from A. boonei bark; and exhibited better antioxidant activity. In addition, a strong correlation (r and R2) was found between polyphenols (TPC and TFC) and antioxidant activity (DPPH, NO and FRAPP). Thus, we preferably recommend the use of water as a solvent for traditional preparations of A. Boonei bark extract for therapeutic purposes.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76083531","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

Phytochemical Screening and Atomic Absorption Spectroscopic Analysis of the Leaf and Stem Extracts of Amaranthus Spinosus 刺苋叶、茎提取物的植物化学筛选及原子吸收光谱分析

Asian Journal of Chemical Sciences Pub Date : 2023-07-09 DOI: 10.9734/ajocs/2023/v13i4244

Anyanele, Sylvalyn Ijeoma, A. I. Egbulefu, A. W. Chibuzo, Umeokoli, Blessing Ogechukwu, Modozie, Benjamin Uchenna

引用次数: 0

Optimization of Curcumin Method and Usage of Natural Curcumin in Determination of Boron in Steel 姜黄素法的优化及天然姜黄素在钢中硼含量测定中的应用

Asian Journal of Chemical Sciences Pub Date : 2023-07-05 DOI: 10.9734/ajocs/2023/v13i3243

R. Silva, W. K. D. L. K. Walpita

{"title":"Optimization of Curcumin Method and Usage of Natural Curcumin in Determination of Boron in Steel","authors":"R. Silva, W. K. D. L. K. Walpita","doi":"10.9734/ajocs/2023/v13i3243","DOIUrl":"https://doi.org/10.9734/ajocs/2023/v13i3243","url":null,"abstract":"Boron containing alloy steels are mainly used in constructional, automotive and many other applications. The presence of even trace amounts of boron affects greatly on the properties of steel such as hardness and machinability. Therefore, it is important to determine it accurately and precisely in the manufacture of these alloys. Due to the drawbacks of common advanced techniques such as Atomic Absorption Spectroscopy (AAS), Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES), the universally accepted method for determination of boron in steel is the spectrophotometric method using curcumin as an auxiliary agent. \u0000Although curcumin is the most sensitive spectrophotometric reagent for the above analysis, synthetic curcumin is relatively expensive and it tends to degrade rapidly once it is exposed to air. Furthermore this method is time consuming. Therefore, this study was carried out in order to improve and optimize the available spectroscopic method and to investigate the possibility of using natural curcumin extracted from turmeric in the above analysis. \u0000The results of the study implied that natural curcumin extracted and purified from turmeric can be used as accurately and precisely as synthetic curcumin in the analysis of boron in steel. A boron-steel alloy sample found to be containing 0.26±0.01 percent of boron with synthetic curcumin gave a concentration of 0.25±0.00 percent of boron with natural curcumin, indicating no significant difference in the determination. A steel sample found to be containing 0.27±0.01 percent of boron with filter paper ashing step gave a concentration of 0.26±0.01 percent of boron without filter paper ashing step indicating no significant difference. Altering the refluxing step of current procedure significantly changes the concentration of boron indicating that the refluxing step cannot be optimized further.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89654207","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

Catalytic Reaction with Benzoic Acid Phenylacetylene in the Presence of Complex Catalysts 在络合催化剂存在下与苯甲酸、苯乙炔的催化反应

Asian Journal of Chemical Sciences Pub Date : 2023-06-22 DOI: 10.9734/ajocs/2023/v13i3242

A. Parmanov, S. Nurmanov, Mirjalol E. Ziyadullaev, Navro’za U. Bekboyeva, Nizombek D. Xolmuhammedov, Shavkat Sh. Tursunov

引用次数: 0

Comparative Physicochemical, Phytochemical Parameters and antiradical activities of Ximenia americana L. (Olacaceae) Almond Oils from three Locals Variants 美洲西米尼亚(hilenia americana L.， Olacaceae) 3个地方变种杏仁油理化、植物化学参数及抗自由基活性比较

Asian Journal of Chemical Sciences Pub Date : 2023-06-20 DOI: 10.9734/ajocs/2023/v13i3241

Vincent Rouamba, Lassane Ouedraogo, M. Compaoré, Hémayero Sama, M. Kiendrebeogo

{"title":"Comparative Physicochemical, Phytochemical Parameters and antiradical activities of Ximenia americana L. (Olacaceae) Almond Oils from three Locals Variants","authors":"Vincent Rouamba, Lassane Ouedraogo, M. Compaoré, Hémayero Sama, M. Kiendrebeogo","doi":"10.9734/ajocs/2023/v13i3241","DOIUrl":"https://doi.org/10.9734/ajocs/2023/v13i3241","url":null,"abstract":"Aims: This study aimed to compare local variants of X. americana with optimal properties for production in the food and phytomedicine industry. \u0000Methodology: The plant material was collected from three sites in Burkina Faso, namely Gonsé, Saponé and Kokologho from May to June 2021. The oil yield was estimated and the physicochemical parameters were performed according to ISO standards. Phytochemical screening of polyphenols and flavonoids was carried out and the antioxidant activities of the oils from different trees were evaluated using DPPH and ABTS tests. \u0000Results: The average oil extraction yield for the three variants was 42.30 ± 14.34%.The estimated colour oil was yellow. The oil refraction index indicated that the Gonsé site (1.471 ± 0.002) has the highest value. The highest oil temperature value was obtained from Kokologho trees (30.60 ± 0.21°C) followed by the ones collected at Gonsé (22.63 ± 1.72°C) and Saponé (22.60 ± 0.41°C). The oil acid value of almonds from all three sites with an average value of 0.023 ± 0.013 mg KOH/g was lower than the international standard ISO 660-2020. The Saponé and Kokologho sites exhibited the highest oil peroxide values of 0.040 ± 0.000 mEq O2/kg on either side, while the lowest peroxide value was found at Gonsé (0.021 ± 0.000 mEq O2/kg). The highest saponification value is that of Kokologho with a value of 84.81 ± 4.18 mg KOH/g. The polyphenol and flavonoid content of almond oil vary within a site and between sites. Oil extracts have shown free radical scavenging capabilities (DPPH and ABTS) indicating substantial polyphenol and flavonoid content. \u0000Conclusion: The oil has very good quality and fulfills all standard requirements for use in the phytomedicine and food industry. A mass selection can be performed within the three sites for X. americana plantation in agroforestry systems.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83142506","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

Profiling the Contamination Level and Pollution Load Index of Borehole Water from Esako West LGA, Edo State, Nigeria 尼日利亚埃多州Esako West LGA井水污染水平和污染负荷指数分析

Asian Journal of Chemical Sciences Pub Date : 2023-06-08 DOI: 10.9734/ajocs/2023/v13i3240

Moses Okeahialam Ekeoma, Verla Evelyn Ngozi, Paulinus Rachael, Mbuka-Nwosu Iheoma Ezichi, V. A. Wirnkor

引用次数: 0

Spectrophotometric Study of Kinetics of Redox Reaction between Caffeine and Permanganate Ion in Aqueous Acidic Medium 酸性水溶液中咖啡因与高锰酸盐离子氧化还原反应动力学的分光光度法研究

Asian Journal of Chemical Sciences Pub Date : 2023-06-08 DOI: 10.9734/ajocs/2023/v13i3239

F. Jones, I. Anweting, I. E. Okon, K. Andem

引用次数: 0

Biochemical Symmetrization/ Desymmetrization of Organic Compounds: Dendrimeric Relationship with Molecular Formulas 有机化合物的生化对称/去对称:与分子式的枝聚体关系

Asian Journal of Chemical Sciences Pub Date : 2023-05-23 DOI: 10.9734/ajocs/2023/v13i2238

D. Iga, D. Popescu, V. Niculescu

{"title":"Biochemical Symmetrization/ Desymmetrization of Organic Compounds: Dendrimeric Relationship with Molecular Formulas","authors":"D. Iga, D. Popescu, V. Niculescu","doi":"10.9734/ajocs/2023/v13i2238","DOIUrl":"https://doi.org/10.9734/ajocs/2023/v13i2238","url":null,"abstract":"A criterion for systematization of organic compounds is described. Organic compounds (estimated to 16-20 millions) are of three types: (A) symmetric (especially meso and C2 symmetric), (B) possible symmetry generators, i.e. compounds possessing a real or imaginary, but plausible, symmetric correspondent: irrechi (from irregular distribution of chiral carbons) and constitutional), and (C) archaic (or primitive) that are neither symmetric nor possible symmetry generators. Symmetric compounds are a minority in organic chemistry. The three groups are (bio) chemically interchangeable. In preceding papers we have demonstrated that almost all natural micromolecular combinations are either symmetric or possible symmetry generators; archaic (primitive) type is also represented in natural chemistry. On the other hand, it should be stressed that symmetric compounds, both meso and C2 symmetrical (C2 symm.) have been found almost exclusively in plants and microorganisms, and they are usually produced from constitutional (constit.) precursors. A series of symmetrization/desymmetrization reactions are presented, and the proof is evidenced that they can establish a new and coherent concept in biochemistry and organic chemistry. Symmetrization reactions can be followed according to chemical type involved: oxidation, cyclization, esterification, glycosylation, methylation, etc. This approach is valid to all major classes of compounds. A dendrimeric relationship is presented within molecular formulae.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"131 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76999072","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

Simulation Studies on Recovery of Acetonitrile from Aqueous Acetonitrile Waste from Pharmaceutical Processes 从制药废水中回收乙腈的模拟研究

Asian Journal of Chemical Sciences Pub Date : 2023-05-17 DOI: 10.9734/ajocs/2023/v13i2237

S. Tasleem, Satish Kumar Bomma

引用次数: 0