Asian Journal of Chemical Sciences最新文献

{"title":"Biogenically Synthesized Silver/Gold Nanoparticles, Mechanism and their Applications: A Review","authors":"Stephen Adongo Odongo, Solomon Omwoma Lugasi, F. Okumu, M. Onani, S. Lagat, S. Agong","doi":"10.9734/ajocs/2022/v11i219116","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i219116","url":null,"abstract":"Green nanoparticle synthesis is a vital branch in nanotechnology. These nanoparticles are synthesized with the aid of phytochemicals in plant extracts. The phytochemicals also stabilize the synthesised nanoparticles eliminating the use of toxic capping agents. Silver and gold (Ag NPs, Au NPs) green nanoparticles are common. They have wide applications in areas such as diagnosis, drug delivery and therapeutics. Despite their great applications, particle agglomeration greatly hinders their usage. As such, we explore various synthetic methods used to obtain green nanoparticles. Reaction mechanisms of the phytochemicals and precursor metals used to obtain the nanoparticles are studied in detail so as to get to the core of the problem. Use of broths obtained by boiling fresh plant leaves, stem, roots, bark or peels of fruits is the most widely used synthetic pathway. Reaction temperature, pH and metal concentration are the crucial factors controlling agglomeration and particle size. Furthermore, incorporation of sunlight in the synthetic pathway was found to be economically important. The functionality of the as-synthesized nanoparticles can be modified through careful selection of the plant material used. Specifically, use of ethnomedical plants such as Azadirachta indica leaves and Hibiscus rosa-sinensis among others is documented to produce nanoparticles with therapeutic functions. It is desirable to obtain small size non-agglomerated green nanoparticles as the size of the nanoparticles affects their antimicrobial activity. In addition, smaller nanoparticles are more effective in drug delivery.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81385645","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}

{"title":"Synthesis of Copper Oxide Nanoparticles using Ocimum Gratissimum (Scent Leaf)","authors":"O. O. Abosede, C. G. Ikimi","doi":"10.9734/ajocs/2022/v11i119115","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i119115","url":null,"abstract":"Environmentally friendly synthesis of copper oxide nanoparticles (NPs) has been achieved using aqueous extracts of Ocimum gratissimum leaf (scent leaf). The reduction of Cu2+ was followed by the change of color from green to dark brown color and formation of precipitate. The reaction was monitored by visual observation and characterization of copper nanoparticles using UV-Visible spectrophotometer and Fourier Transform Infrared spectrophotometery. UV-Visible spectra of the aqueous solution containing copper nanoparticles showed a peak at 240 nm corresponding to the surface plasmon resonance of copper oxide nanoparticles. FTIR spectra also confirmed the formation of the copper oxide NPs by the appearance of bands corresponding to Cu-O stretching frequency, and the presence of phytochemicals present in Ocimum gratissimum adsorbed on the surface of the copper oxide nanoparticles presents these nanoparticles as promising biological agents. This green synthesis method replaces the use of toxic chemicals with Ocimum gratissimum extract which play the roles of reducing, stabilizing and capping agents during the synthesis.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89402162","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}

{"title":"Comparative Study of the Environmental and Sanitary Impacts of two fish Smoking Systems (Traditional Oven and FTT Oven) used by the Women of Guessabo (Ivory Coast)","authors":"Ossehin Ambroise, Etchian Assoi Olivier, Seka Yapoga Jean, Gnagne Agness Essoh Jean Eudes Yves, Yapo Ossey Bernard","doi":"10.9734/ajocs/2022/v11i119114","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i119114","url":null,"abstract":"Women use traditional methods for smoking in Côte d'Ivoire. These methods have an impact on the environment and their health because of the emission of CO2 which is a greenhouse gas and other gases (VOCs, PAHs...), carcinogenic and dangerous for the respiratory system. In 2013, an improved kiln, called FAO-Thiaroye Processing Technique (FTT) was introduced in Côte d'Ivoire in order to reduce the health and environmental impacts. The objective of this study is to compare the environmental and health impacts between traditional and improved ovens used by women in Guessabo. This study involved 45 fish smokers using traditional stoves, 34 smokers using FTT stoves and 50 controls. It was conducted from January to December 2017. The data collection methodology included questionnaire survey, interviews, observations, and medical prospection. Also, baseline spirometry and bronchial metacholine reversibility test in each woman were performed. Bronchial hyperreactivity was obserbed to be more frequent in women smokers who practice with traditional furnaces. Three measurement campaigns of Carbon dioxide (CO2), carbon monoxide (CO), volatile organic compounds (VOC) and Nitric oxide (NO) were carried out. The level of CO measured at the traditional sites varies from 19 to 184 mg/m3. It is often higher than the acceptable limit value (50mg/m3). However, these gas levels were very low with the use of FTT furnaces.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74979183","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}

{"title":"Comparative Analysis of Some Selected Citrus Seeds Oil from North Central, Benue State, Nigeria","authors":"Ibejekwe Sunday John, Gambo Nanbol Ndam, A. N. Thliza","doi":"10.9734/ajocs/2022/v11i119113","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i119113","url":null,"abstract":"The physicochemical properties of oils from citrus seeds of different species; tangerine (citrus reticulate), sweet orange (citrus sinesis), lime (citrus aurantifolia) and Grape (citrus paradise) were investigated. The seeds of each species were collected from the central zone of plateau state, washed, sun dried for three days and finally crushed with mortar and pestle. One hundred grams (100 g) of each seeds were measured for oil extraction using n-hexane with soxhlet extractor for six hours. The percentage yield and moisture content of each oil extracted from seeds of each species were determined. The physicochemical properties for seeds were also carried out using Wijs method for Iodine value and Titration method for Acid value, Saponification value, Peroxide value and Free Fatty Acids. The results reveals that the moisture content ranges from 2.25 – 4.08 %, percentage yield 30 – 42.20 %, iodine value 78.32 – 98.04 gI2/g, acid value 2.06 – 4.44 %, saponification value 187.38 – 196.06 mgKOH/g, peroxide value 36.52 – 53.57 mEq/kg, free fatty acid 1.41 – 8.74 % and density 0.78 – 0.96 gml-1. The result obtained indicates that oils from these seeds can be used as raw material for the production of cosmetics, soap and domestic cooking.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83259346","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}

{"title":"Mineral Based Boards Made from Lignocellulosic Wastes. Part 2. Chemical and Technological Properties","authors":"H. Şahin, O. Yalcin, A. Kaya","doi":"10.9734/ajocs/2022/v11i119111","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i119111","url":null,"abstract":"The aim of this study was to investigate experimental panels produced from mixture of agriculture wastes with mineral adducts under synthetic adhesive bonding process. In this respect, the effects of the two different mineral loading as reinforced additive (olivine and dolomite) in lignocellulosic matrix (agricultural residue of tomato- and eggplant stalk chips) system were investigated. The highest heat conductivity value of l: 0.461 W/mK and 0.449 W/mK was found on panels that made only from tomato stalk- and eggplant stalk chips (controls) while lowering effects were found when dolomite and olivine added to matrix at various proportions. But all heat conductivity value were found to be lower than standard value (l: <0.065 W/mK). However, all the experimental panels show the burning pattern on the surfaces which char did not reach the 150 mm threshold limit, regardless of board formulations or experimental conditions. It could be proposed that proportions of olivine and dolomite as reinforcing element in lignocellulosic matrix have a lowering effects on flame spreading at certain extent. It is notable that mass loss (%) properties of samples were found to be quite different from the insulation values. For dolomite-based panels, the lowest mass loss values were found to be 8.83% and 9.97% for boards prepared from similar proportion (1:1, w/w, %) of dolomite-tomato stalk chips (XTV) and dolomite-eggplant stalk chips (XEV), respectively. For dolomite-based panels, the lowest mass loss of 6.79% and 9.11% were found to be boards produced from 30% tomato stalks chip and 70% olivine (YTIII), 60% eggplant stalk chip and 40% olivine in mixture proportions (YEIV), respectively. It is realized that the panels produced with mineral additives show higher degradation temperature with less mass loses (%, w/w) than controls. These are clear evidence that the presence of dolomite and olivine with lignocellulosic matter make panels more durable against fire and significantly reduces the mass loss. The FTIR spectra show characteristic spectrum of lignocellulose structure concentrate in the range of 800–3500 cm-1 and the major peaks in that range had been identified.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"142 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77864140","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}

{"title":"Synthesis and Structural Elucidation of 1, 4 Dihydropyrimido [1, 2-a] Benzimidazole","authors":"Kaushik Joshi, Vikas Chauhan, Hardik Bhatt, Nikunj Dave","doi":"10.9734/ajocs/2022/v11i119112","DOIUrl":"https://doi.org/10.9734/ajocs/2022/v11i119112","url":null,"abstract":"Considering various biomedical significance & with a view of pharmacological actions of compound belong to this class, new series of N-(substituted phenyl)-2-methyl-4-(2-(6-oxo-1-phenyl-1-6-dihydro-[2-3-bipyridin]-5-yl)phenyl)-1-4-dihydro pyrimido [1, 2-a] benzimidazole-3-carboxamide ware prepared. The formation of the compound was accomplished by cyclocondensation of 2-(1, 2-dihydro-2-oxo-1-phenyl-5-(pyridin-2-yl)pyridin-3-yl) benzaldehyde and N-(substituted phenyl)-3-oxobutanamide, 2-amino-benzimidazole under acid catalyzed conditions. The structures of pyrimidobenzimidazoles were determined by MASS, IR, 1H NMR spectroscopic techniques & Elemental analysis technique.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84233078","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}

{"title":"Evaluation of Anti Microbial Activity of -2-Pyridinealdazine","authors":"R. Arulmani, N. Sarathi, R. Rajalakshmi","doi":"10.9734/ajocs/2021/v10i419110","DOIUrl":"https://doi.org/10.9734/ajocs/2021/v10i419110","url":null,"abstract":"The main objective of this work was to prepare and to evaluate the antibacterial and anti fungal activity of 2-Pyridinealdazine.This azine is screened for its antimicrobial activity against both gram positive and gram negative bacterial and fungal strains like fungal strains Aspergillus flavus, Aspergillus niger, Fusarium oxysporum, Penicillium chrysogenum,Trichoderma viride. 2-Pyridinealdazine was found to be effective inhibitor of all pathogenic strains with the inhibition zone ranging from 10 to 30mm.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91213714","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}

{"title":"Metal Complexes of Gatifloxacin: Synthesis, Characterization and Evaluation of Biological Activity","authors":"N. Dave, H. Bhatt","doi":"10.9734/ajocs/2021/v10i419109","DOIUrl":"https://doi.org/10.9734/ajocs/2021/v10i419109","url":null,"abstract":"The antibiotic agent Gatifloxacin is well known for its drug design and coordinating ability towards metal ions. In this paper, synthesis and biological activity of Mn(II), Co(II), Ni(II), Cu(II) and Mg(II) complexes of gatifloxacin is reported. Ligand is itself prepared using o-phenylenediamine (OPD) and 3-acetyl coumarin. The structure of complexes has been investigated using some physiochemical and spectroscopic techniques. In vitro evaluation of these complexes was also carried out for antibacterial and antimicrobial activity. Some complexes exhibited promising anti-bacterial and antimicrobial activity compared to gatifloxacin drug.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91363449","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}

{"title":"Research on Application of Artificial Neural Network in Fault Diagnosis of Chemical Process","authors":"Haonan Wang, Yijia J. Chen","doi":"10.9734/ajocs/2021/v10i419108","DOIUrl":"https://doi.org/10.9734/ajocs/2021/v10i419108","url":null,"abstract":"Chemical processes are usually toxic, corrosive, flammable and explosive. If the process fails, the danger is extremely high. Traditional model-based fault diagnosis methods need to establish an accurate mathematical model of the system, while modern engineering processes are usually large in scale and complex, and it is difficult to establish an accurate mathematical model. Artificial neural network has been widely used in chemical process because of its advantages of parallel processing, self-adaptation, robustness, learnability and fault tolerance. Artificial neural networks based on \"deep learning\" have been successfully applied to fault diagnosis in various chemical processes. This article summarizes the principle and development process of artificial neural networks, and analyzes the research progress and application status of deep neural networks in chemical process fault diagnosis based on cases. Finally, it is pointed out that deep neural network in the field of chemical process fault diagnosis is of great significance in solving the impact of less fault data and system state changes on the fault detection rate, and promoting the industrial application of fault diagnosis models.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78354175","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}

{"title":"Synthesis and Characterization of Barium-Iron Oxide Based Neodymium, Gadolinium and Praseodymium Doped Ceramic Materials","authors":"A. Aytimur, S. Koçyiğit, I. Uslu","doi":"10.9734/ajocs/2021/v10i419105","DOIUrl":"https://doi.org/10.9734/ajocs/2021/v10i419105","url":null,"abstract":"Neodymium, gadolinium, and praseodymium doped barium-iron oxide ceramic materials were synthesized by polymeric precursor method. No carbon contents or the moisture was observed in infrared spectra of the ceramics. Neodymium and gadolinium doped ceramics were crystallized in cubic lattice form, while praseodymium doped ceramic was formed in hexagonal lattice. Same results were observed from SEM images, Neodymium and gadolinium doped ceramics had similar morphological structures, but praseodymium doped ceramics had slightly different morphology. Neodymium and gadolinium doped ceramics consisted of grain-like structure, while praseodymium doped ceramic material consisted of both grain-like and pillar-like crystal structures.","PeriodicalId":8505,"journal":{"name":"Asian Journal of Chemical Sciences","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73506081","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}