Open Journal of Analytical and Bioanalytical Chemistry最新文献

Study the effect of different shapes of plume rise on Gaussian plume models and its maximum in unstable conditions 研究了不同羽流上升形状对高斯羽流模型的影响及其在不稳定条件下的最大值

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2023-05-30 DOI: 10.17352/ojabc.000029

Essa Khaled SM, El Saied Sawsan EM, Wheida Aa, Naze Mustafa El

{"title":"Study the effect of different shapes of plume rise on Gaussian plume models and its maximum in unstable conditions","authors":"Essa Khaled SM, El Saied Sawsan EM, Wheida Aa, Naze Mustafa El","doi":"10.17352/ojabc.000029","DOIUrl":"https://doi.org/10.17352/ojabc.000029","url":null,"abstract":"Exposure to radioactive pollutants such as Iodine-135 I135 seriously threatens public health and environmental balance. Monitoring and managing these pollutants require expensive economic equipment that is not suitable for low-income countries such as Egypt. Therefore, trying to derive a mathematical model that estimates the concentrations of these radioactive pollutants with high accuracy and a low relative error coefficient compared to the actually measured values is very important. Therefore a mathematical Gaussian model was received to estimate the concentrations of I135 emitted from the research nuclear reactor in the Inshas region in Egypt using different shapes of plume rise in unstable conditions. A comparison between the derived model and its maximum values with observed concentrations data measuring on Egyptian Atomic Energy Authority for I135 in unstable conditions has been found. The derived model may be applied to estimate and predict the emissions of any radioactive pollutant for any similar area and similar type of used reactor, which provides high-precision technology with zero economic cost. The statistical technique shows that the entire Gaussian model and its maximum inside a factor of two with observed concentration data achieved 98%. In addition, the statistics show that all the Gaussian plume models and their maximum have a correlation coefficient of about 0.95%. Also, the normalized mean square error. And the fraction bias. are near-zero values in all Gaussian models and their maximum.","PeriodicalId":162709,"journal":{"name":"Open Journal of Analytical and Bioanalytical Chemistry","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121194761","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

Porous carbon derived from Zea mays cobs as excellent electrodes for supercapacitor applications 从玉米中提取的多孔碳可以作为超级电容器的极好电极

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2023-02-09 DOI: 10.17352/ojabc.000028

Kigozi Moses, Koech Richard K, Orisekeh Kingsley, Kali Ravi, Kamoga Omar LM, Padya Balaji, B. Abdulhakeem, Kasozi Gabriel N, Jain Pawan Kumar, Kirabira John Baptist, Onwualu Azikiwe Peter, Dzade Nelson Y

{"title":"Porous carbon derived from Zea mays cobs as excellent electrodes for supercapacitor applications","authors":"Kigozi Moses, Koech Richard K, Orisekeh Kingsley, Kali Ravi, Kamoga Omar LM, Padya Balaji, B. Abdulhakeem, Kasozi Gabriel N, Jain Pawan Kumar, Kirabira John Baptist, Onwualu Azikiwe Peter, Dzade Nelson Y","doi":"10.17352/ojabc.000028","DOIUrl":"https://doi.org/10.17352/ojabc.000028","url":null,"abstract":"Improving the efficiency of the electrode materials is critical for achieving high performance in supercapacitors. Porous carbon with appropriate designs is dependable for better electrochemical capacitors. In this work, we improved Zea mays (maize) cobs as a potentially plentiful precursor for generating porous carbon supercapacitor applications. The physical and chemical properties of the synthesized materials were determined using several approaches, including structure, morphology, chemical composition, and electrochemical performance. The chemical analyses revealed an oxygen-based surface structure, while structural analysis revealed a BET-specific surface area of 1443.94 m3/g and a pore volume of 0.7915 cm3/g. Symmetric devices based on the materials generated had a specific capacitance of 358.7F/g, an energy density of 12.45 Wh/kg and a power density of 250 W/kg at 0.5A/g. The as-prepared electrodes demonstrated exceptional stability, with a capacitance retention of 99% at the maximum potential for a total of 130 hours of testing.","PeriodicalId":162709,"journal":{"name":"Open Journal of Analytical and Bioanalytical Chemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125817755","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

Assessment of diastase levels in different floral honey from Oromia region, Ethiopia 埃塞俄比亚奥罗米亚地区不同花蜜中淀粉酶水平的评估

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2022-12-31 DOI: 10.17352/ojabc.000027

Meskele Deressa Kebebe, Damto Teferi, G. Meseret, Laggase Gemechis

{"title":"Assessment of diastase levels in different floral honey from Oromia region, Ethiopia","authors":"Meskele Deressa Kebebe, Damto Teferi, G. Meseret, Laggase Gemechis","doi":"10.17352/ojabc.000027","DOIUrl":"https://doi.org/10.17352/ojabc.000027","url":null,"abstract":"Diastase is an enzyme that is found naturally in honey and degrades over time, especially when exposed to heat. Diastase can be used to indicate the age and exposure of honey to heat. However, they play a very significant role in honey quality. This study aimed to assess the diastase levels of different floral honey in potential areas of the Oromia region. In this study diastase activity, free acidity, and pH contents of different floral kinds of honey of potential areas in the Oromia region of Ethiopia were investigated based on the IHC- 2009- method. The honey pollen spectra were also characterized. When compared to other flora honey collected from the study area, the diastase activity of Erica arborea honey revealed significantly different (p < 0.05). It ranged from 4.61 ± 1.50 to 12.75 ± 4.78 Schade unit. The results of the pH value and free acidity analyses test demonstrated that the honey samples used in this investigation were fresh which ranged from 3.22 ± 0.13 to 4.17 ± 0.97 and 22.43 ± 6.37 to 35.10 ± 10.51 meq/kg honey, respectively. Honey bees’ geographical race, location and harvesting time affected diastase activities. However, it was not possible to identify the real factor influencing its diastase activities which needs further study at different agroecologies for different floral kinds of honey of the country.","PeriodicalId":162709,"journal":{"name":"Open Journal of Analytical and Bioanalytical Chemistry","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922670","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

Benzofuran and Naphthofuran based chemosensors for metal ion detection using fluoroscence spectroscopy 基于苯并呋喃和萘呋喃的荧光光谱金属离子检测化学传感器

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2022-10-31 DOI: 10.17352/ojabc.000026

Ali Sonia, Joshi Sakshi, Agarwal Jyoti

引用次数: 0

Dissipation kinetics and the pre-harvest residue of chlorantraniliprole in pigeon pea Cajanus cajan L. succulent pods Using Ultra-High-Performance Liquid Chromatography with Photodiode array detector (UHPLC-PDA) 超高效液相色谱-光电二极管阵列检测器(UHPLC-PDA)研究食鸽豆肉质荚果中氯虫腈的耗散动力学及采前残留

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2022-04-27 DOI: 10.17352/ojabc.000025

T. Murali Krishna, K. Devaki, K. Kiran Kumar, L. Prasanthi

{"title":"Dissipation kinetics and the pre-harvest residue of chlorantraniliprole in pigeon pea Cajanus cajan L. succulent pods Using Ultra-High-Performance Liquid Chromatography with Photodiode array detector (UHPLC-PDA)","authors":"T. Murali Krishna, K. Devaki, K. Kiran Kumar, L. Prasanthi","doi":"10.17352/ojabc.000025","DOIUrl":"https://doi.org/10.17352/ojabc.000025","url":null,"abstract":"Studies were conducted to evaluate insecticide residues of Chlorantraniliprole in pigeon pea succulent pods after foliar application. Chlorantraniliprole was sprayed at 0.6ml/l on pigeon pea crop at the pod formation stage to control pod borers like Helicoverpa armigera and Maruca vitrata. Samples were drawn at 0, 1, 5, 10, 15, 20, 25, and 30 days after spray. A validated liquid chromatography method with a Photodiode Array (PDA) detector was used for the residue analysis of chlorantraniliprole. Separation was achieved through the C18 column in the reverse phase. The calibration graphs of chlorantraniliprole in acetonitrile solvent or five blank matrices were linear within the tested interval of 0.1 to 1ppm with a coefficient of determination over 0.9990. Dissipation of chlorantraniliprole was studied in first-order kinetic models (for which the coefficient of determination, R2 was 0.8684). Residues of chlorantraniliprole was 3.57, 3.16, 1.61, 1.13, 0.49, 0.21, 0.05 and 0.00mg/kg at 0, 1, 5, 10, 15, 20, 25 and 30 days after spraying. The residue level reached below the tolerance limit (MRL) (2mg/kg BW) of Codex Alimentarius Commission (CAC) on Pesticide Residues after 5 days of spray and below the detectable level after 25 days of spray in succulent pods and recorded a biological half-life of 4.36 days.","PeriodicalId":162709,"journal":{"name":"Open Journal of Analytical and Bioanalytical Chemistry","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123563406","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: 1

Regulation of enzymes with identical subunits on the example of Transketolase 以转酮醇酶为例，具有相同亚基的酶的调控

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2022-03-07 DOI: 10.17352/ojabc.000024

Solovjeva Olga N

{"title":"Regulation of enzymes with identical subunits on the example of Transketolase","authors":"Solovjeva Olga N","doi":"10.17352/ojabc.000024","DOIUrl":"https://doi.org/10.17352/ojabc.000024","url":null,"abstract":"The molecule of transketolase is a dimer with structurally and functionally identical subunits. Its active sites are located in the region of intersubunit contact, which has been shown also for other thiamine enzymes. This leads to the reciprocal influence of active sites in the binding of cofactors and during catalysis. In this review, it is shown that the functional non-equivalence of the active sites of transketolase from Saccharomyces cerevisiae is initially formed upon the binding of the first cofactor, a divalent cation, not thiamine diphosphate, as previously thought. An attempt was made to find the reason for the differences between catalytic measurements and crystallographic data on the possible part-of-the-sites reactivity of the functioning of transketolase. At the same time, the difference in the amplitudes of dichroic absorption during the binding of reversibly and irreversibly splitting substrates has nothing to do with the flip-flop mechanism. It was also shown that with an increase in the concentration of substrates, a sharp decrease in activity occurs, which is explained by a switch from the simultaneous binding of the substrate in two active sites to its alternate binding both in one-substrate and two-substrate reactions. This fact could also be the reason for the rejection of the flip-flop mechanism of catalysis by transketolase. The mechanism may be similar to human transketolase, which may have clinical application.","PeriodicalId":162709,"journal":{"name":"Open Journal of Analytical and Bioanalytical Chemistry","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116067963","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

Adsorption of Pb2+ ions in aqueous media using the new zeolite nanocomposite adsorbent CaOCdO/ZSM5 synthesized with new techniques 新工艺合成的新型沸石纳米复合吸附剂CaOCdO/ZSM5吸附水中Pb2+离子

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2022-02-04 DOI: 10.17352/ojabc.000023

Sadeghi Meysam, Zarshenas Pourya

引用次数: 0

Identification of antioxidative ingredients from feverfew (Tanacetum parthenium) extract substantially free of parthenolide and other alpha-unsaturated gamma-lactones 从小白菊(Tanacetum parthenium)提取物中鉴定抗氧化成分，基本上不含parthenolide和其他α -不饱和γ -内酯

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2019-12-13 DOI: 10.17352/ojabc.000015

Fa Zhang, Jian-bo Zhou, Yiqun Shi, Ken Karaisz

引用次数: 5

Development and Validation of Stability Indicating RP-HPLC Method for Simultaneous Estimation of Ibuprofen and Carisoprodol in Pharmaceutical Formulation 同时测定制剂中布洛芬和卡异丙醇含量的稳定性指示反相高效液相色谱法的建立与验证

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2019-11-06 DOI: 10.17352/ojabc.000014

A. Rao, P. Vijetha

引用次数: 1

Fast multi-residue method for determination of nineteen benzimidimidazoles in meat tissues by liquid chromatography tandem mass spectrometry 液相色谱串联质谱法测定肉类组织中19种苯并咪唑的快速多残留方法

Open Journal of Analytical and Bioanalytical Chemistry Pub Date : 2019-11-05 DOI: 10.17352/ojabc.000013

Milena Funeva-Peycheva, G. Stoev

引用次数: 2