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Design and cytotoxic activity of thiazolidinones via one-pot, three component reaction under microwave and traditional method 通过微波和传统方法下的一锅三组分反应设计噻唑烷酮类化合物并提高其细胞毒活性
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2024-01-23 DOI: 10.4314/bcse.v38i2.15
Hanan Salah, Nadia A.A. Elkanzi, Azhaar T. Alsaggaf, Alaa Y. Moustafa, Faeza Alkorbi, Ali M. Ali
Treatment of sulfamethoxazole (SMZ ) (1) with different aromatic aldehydes 2a-f within few minutes (5-8 min) afforded the corresponding Schiff bases 3a-f which were subjected to react with thioglycolic acid (4) under refluxing toluene/dimethlformamide (DMF) in (1:1) ratio for 12-17 h, yielded N-(5-methylisoxazol-3-yl)-4-(4-oxo-2-phenyl-1,3-thiazolidin-3-yl)benzenesulfon- amide derivatives 5a-f. On the other hand, the same products 5a-f were obtained when SMZ (1)  was treated with a mixture of the same aromatic aldehydes 2a-f and thioglycolic acid 4  via one-pot, three-component reaction under microwave irradiation. The key advantages of this process were high yields 79-88%, shorter reaction times 6-11 min., easy work-up, and problems associated with toxic solvent use (cost, safety, pollution) were avoided. The structures of newly compounds were elucidated by elemental and spectral analyses. Three compounds 5a, 5b and 5f were tested for cytotoxicity against four human cancer cell lines MCF-7, HePG2, HCT 116 and 116 PC-3. Compound 5b exhibited the most potent cytotoxic properties on HePG2 and PC-3. Furthermore, it showed inhabitory effect against MCF-7 and HCT 116 cells. KEY WORDS: Sulfamethoxazole, 4-Thiazolidinones, Schiff bases, Multicomponent reaction, Microwave, Traditional methods and cytotoxicity Bull. Chem. Soc. Ethiop. 2024, 38(2), 481-491.                                                              DOI: https://dx.doi.org/10.4314/bcse.v38i2.15
磺胺甲噁唑(SMZ )(1)与不同的芳香醛 2a-f 在几分钟内(5-8 分钟)处理,得到相应的希夫碱 3a-f,然后与硫代乙醇酸(4)在甲苯/二甲基甲酰胺(DMF)回流下以(1:1) 的比例反应 12-17 小时,得到 N-(5-甲基异恶唑-3-基)-4-(4-氧代-2-苯基-1,3-噻唑烷-3-基)苯磺酰胺衍生物 5a-f。另一方面,在微波辐照下,通过一锅三组份反应,将 SMZ (1) 与相同的芳香醛 2a-f 和硫代乙醇酸 4 的混合物进行处理,也可得到相同的产物 5a-f。该工艺的主要优点是产率高,达 79-88%;反应时间短,仅需 6-11 分钟;易于操作;避免了使用有毒溶剂带来的成本、安全和污染问题。通过元素分析和光谱分析,阐明了新化合物的结构。测试了三种化合物 5a、5b 和 5f 对四种人类癌细胞株 MCF-7、HePG2、HCT 116 和 116 PC-3 的细胞毒性。化合物 5b 对 HePG2 和 PC-3 的细胞毒性最强。此外,它还对 MCF-7 和 HCT 116 细胞有抑制作用。关键词:磺胺甲噁唑、4-噻唑烷酮、席夫碱、多组分反应、微波、传统方法和细胞毒性 Bull.Chem.Soc.2024, 38(2), 481-491. DOI: https://dx.doi.org/10.4314/bcse.v38i2.15
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引用次数: 0
Chemical composition, antibacterial and antioxidant activities of essential oils from Ccyphostemma adenocaule and Ziziphus spinachristi Ccyphostemma adenocaule 和 Ziziphus spinachristi 精油的化学成分、抗菌和抗氧化活性
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.13
Hadush Gebrehiwot, A. Dekebo, Kebede Shenkute, Urgessa Ensermu, Milkyas Endale
In the present work, the chemical composition, antibacterial and antioxidant potencies of essential oils (EOs) extracted from the leaves and roots of Cyphostemma adenocaule and Ziziphus spinachristi were evaluated. Hydrodistillation was used to extract the EOs and the chemical compositions were analyzed by GC-MS. The antibacterial activity of the EOs were evaluated against four bacterial strains by agar disc diffusion method. Moreover, the antioxidant properties were evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay method. Perillyl alcohol (13.08%) and phytone (12.64%) were the major compounds detected in the leaves and roots of Cyphostemma adenocaule respectively. Whereas, nootkatone was the principal compound detected in the leaves (30.12%) and roots (26.52%) of Ziziphus spinachristi. The antibacterial activity results showed that, the EOs of Cyphostemma adenocaule and Ziziphus spinachristi displayed the highest inhibition zones against Streptococcus pyogenes (13.67 ± 0.34 and 12.67 ± 0.10 mm respectively) at 10 mg/mL. The antioxidant activity of the EOs were also promising, and the strongest IC50 value (4.15 µg/mL) was calculated for Ziziphus spinachristi (leaves). Thus, the antibacterial and antioxidant properties of the EOs enlighten the use of these plants for the aforementioned activities and as a common ingredients in cosmetic applications. KEY WORDS: Essential oils, Antibacterial activity, Antioxidant activity, Cyphostemma adenocaule, Ziziphus Bull. Chem. Soc. Ethiop. 2024, 38(1), 167-186. DOI: https://dx.doi.org/10.4314/bcse.v38i1.13
本研究评估了从 Cyphostemma adenocaule 和 Ziziphus spinachristi 的叶和根提取的精油(EOs)的化学成分、抗菌性和抗氧化性。采用水蒸馏法提取精油,并通过气相色谱-质谱分析其化学成分。采用琼脂盘扩散法评估了 EO 对四种细菌菌株的抗菌活性。此外,还采用 2,2-二苯基-1-苦基肼(DPPH)自由基清除法评估了其抗氧化性。在 Cyphostemma adenocaule 的叶片和根中分别检测到的主要化合物是 Perillyl 醇(13.08%)和植物酮(12.64%)。而 Nootkatone 是在 Ziziphus spinachristi 的叶片(30.12%)和根部(26.52%)中检测到的主要化合物。抗菌活性结果表明,在 10 毫克/毫升的浓度下,Cyphostemma adenocaule 和 Ziziphus spinachristi 的环氧乙烷对化脓性链球菌的抑制面积最大(分别为 13.67 ± 0.34 毫米和 12.67 ± 0.10 毫米)。环氧乙烷的抗氧化活性也很有希望,计算出的最强 IC50 值(4.15 µg/mL)为刺五加(叶片)。因此,精油的抗菌和抗氧化特性为这些植物用于上述活动以及作为化妆品的常用成分提供了启示。 关键词:精油、抗菌活性、抗氧化活性、Cyphostemma adenocaule、Ziziphus Bull.Chem.Soc.2024, 38(1), 167-186.DOI: https://dx.doi.org/10.4314/bcse.v38i1.13
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引用次数: 0
Efficient removal of methylene blue dye from aqueous solution using a new biosorbent derived from Ensete ventricosum (Enset) 利用一种从Ensete ventricosum(恩塞特)中提取的新型生物吸附剂高效去除水溶液中的亚甲基蓝染料
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.6
Belete Tewabe Gebeyehu, Daniel Manaye Kabtamu, Temesgen Alehegne Tasew
In this study, kocho was prepared from pseudostem and corm of Ensete ventricosum (enset).The behaviors of kocho were examined by using FESEM, TGA, XRD and FTIR spectroscopy. The biosorption potential of kocho, a possible low-cost new biosorbent for the efficient removal of MB dye from wastewater was investigated. Biosorption experiments were carried out in batch mode to study the effects of biosorbent dosages (0.025-0.2 g), pH (2–10), initial concentrations of MB (10 to 100 mg/L) and contact time (10 to 120 min).The highest removal efficiency of methylene blue dye (94.2%) was recorded at optimum experimental conditions. Following the removal study, it was determined that the pseudo-second order kinetics (R2 = 0.997) and Langmuir isothermal (R 2= 0.996) models may well describe the MB dye biosorption process. Furthermore, this newly developed biosorbent was fairly recyclable up to five cycles without significant loss of re-adsorption efficiency (around 9.6% loss) between 1st and 5th cycle.  Thus, the findings of this study revealed that a new kocho biosorbent derived from Ensete ventricosum can be used as a promising low-cost, environmentally friendly and efficient biosorbent for the rapid removal of MB from aqueous solutions. KEY WORDS: Kocho, Ensete ventricosum, Biosorption, Methylene blue, Kinetics, Isothermal Bull. Chem. Soc. Ethiop. 2024, 38(1), 69-84. DOI: https://dx.doi.org/10.4314/bcse.v38i1.6
本研究利用文竹(Ensete ventricosum)的假茎和球茎制备了 kocho,并使用 FESEM、TGA、XRD 和傅立叶变换红外光谱对 kocho 的行为进行了检测。研究了 kocho 的生物吸附潜力,它可能是一种高效去除废水中甲基溴染料的低成本新型生物吸附剂。生物吸附实验以批处理模式进行,研究了生物吸附剂用量(0.025-0.2 克)、pH 值(2-10)、甲基溴初始浓度(10-100 毫克/升)和接触时间(10-120 分钟)的影响。去除研究表明,伪二阶动力学模型(R2=0.997)和朗缪尔等温模型(R 2=0.996)可以很好地描述甲基溴染料的生物吸附过程。此外,这种新开发的生物吸附剂可循环使用长达五个周期,且在第一至第五周期之间没有明显的再吸附效率损失(约 9.6%)。 因此,这项研究的结果表明,一种新的 Kocho 生物吸附剂来自于 Ensete ventricosum,可作为一种低成本、环保和高效的生物吸附剂,用于快速去除水溶液中的甲基溴。 关键词:Kocho、Ensete ventricosum、生物吸附、亚甲蓝、动力学、等温 Bull.Chem.Soc.2024, 38(1), 69-84.DOI: https://dx.doi.org/10.4314/bcse.v38i1.6
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引用次数: 0
A selective dispersive liquid-liquid micro-extraction technique for trace level pollutants enrichment of pharmaceutical residues from hospital wastewaters followed by liquid chromatographic analysis 选择性分散液-液微萃取技术用于富集医院废水中的痕量药物残留,然后进行液相色谱分析
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.3
Gadisa Wakuma, Estifanos Ele Yaya, Negash Getachew, Negussie Megersa
In this study a dispersive liquid-liquid micro-extraction (DLLME) method was utilized for extraction of trace pharmaceuticals in wastewater samples. Factors influencing the extraction performances were tested and accordingly 900 µL dichloroethane as the extraction solvent, 1400 µL acetonitirle as dispersive solvent, 10 min extraction time at 4000 rpm centrifugation, and pH 5 were found optimum. Acetonitrile and 0.2% formic acid in water were used as eluent. The column temperature was maintained at 25 °C and the optimum detection wavelengths of 273 nm for sulfamethoxazole and 280 nm for ciprofloxacin were used. For both the analytes, the coefficients of determinations (r2) were found to vary from 0.9989 to 0.9997, confirming good linearity in the concentration range of 0.005-100 µg mL-1 for sulfamethoxazole and 0.01-100 µg mL-1 for ciprofloxacin. The LOD and LOQ were in the range of 0.78-1.58 ng mL-1 and 2.24-5.28 ng mL-1, respectively; the RSDs were 0.41-3.21% for intra-day precision and 0.37-6.44% for inter-day precision. The concentrations of the three pharmaceuticals determined ranged from 0.76-1.53 μg mL-1 in the wastewater samples collected from Black Lion Hospital. However, ciprofloxacin and doxycycline were not detected and only low concentration of sulfamethoxazole was detected in the wastewater samples collected from Menelik II Hospital. KEY WORDS: Antibiotics, DLLME, Dispersive solvent, Hospital wastewater Bull. Chem. Soc. Ethiop. 2024, 38(1), 27-42. DOI: https://dx.doi.org/10.4314/bcse.v38i1.3
本研究采用分散液-液微萃取(DLLME)法萃取废水样品中的痕量药物。对影响萃取性能的因素进行了测试,结果表明 900 µL 二氯乙烷为萃取溶剂,1400 µL 乙腈为分散溶剂,4000 rpm 离心 10 分钟萃取,pH 值为 5 为最佳萃取条件。洗脱液为乙腈和 0.2%甲酸水溶液。色谱柱温度保持在 25 °C,磺胺甲噁唑的最佳检测波长为 273 nm,环丙沙星的最佳检测波长为 280 nm。对于这两种分析物,测定系数(r2)在 0.9989 至 0.9997 之间,证明在 0.005-100 µg mL-1 的浓度范围内磺胺甲噁唑和 0.01-100 µg mL-1 的浓度范围内环丙沙星具有良好的线性关系。最低检测限和最低定量限分别为 0.78-1.58 ng mL-1 和 2.24-5.28 ng mL-1;日内精密度的 RSD 为 0.41-3.21%,日间精密度的 RSD 为 0.37-6.44%。在黑狮医院采集的废水样本中,三种药物的测定浓度范围为 0.76-1.53 μg mL-1。然而,在梅内利克二世医院采集的废水样本中未检测到环丙沙星和多西环素,仅检测到低浓度的磺胺甲噁唑。 关键词:抗生素、DLLME、分散溶剂、医院废水 Bull.Chem.Soc.2024, 38(1), 27-42.DOI: https://dx.doi.org/10.4314/bcse.v38i1.3
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引用次数: 0
New iron(III), cobalt(II), nickel(II), copper(II), zinc(II) mixed-ligand complexes: Synthesis, structural, DFT, molecular docking and antimicrobial analysis 新的铁(III)、钴(II)、镍(II)、铜(II)、锌(II)混合配体配合物:合成、结构、DFT、分子对接和抗菌分析
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.12
Hany M Abd El-Lateef, Ali M. Ali, Mai M Khalaf, A. Abdou
The present framework has as its goal the design and synthesis and characterization of new mononuclear 1:1:1 (M:L:Q) mixed-ligand complexes, including FeLQ, CoLQ, NiLQ, CuLQ, and ZnLQ. The "L," is the 4-[(4-oxo-4,5-dihydro-1,3-thiazol-2-yl)hydrazono]methylphenyl 4-methylbenzenesulfonate, while the "Q," is the 8-hydroxy quinoline. According to the findings, L and Q ligands each play the role of a neutral bi-dentate NN and a monobasic bi-dentate ON ligand, respectively. The findings demonstrated an octahedral shape. The density functional theory (DFT) technique was employed, and the quantum chemical descriptors were assessed, to optimize the molecular structure of the compounds. An in vitro investigation was carried out to investigate the antibacterial and antifungal activities of the compounds. According to the findings, the activity of metal complexes as potential candidates for use as antibiotics and antifungals is much greater than that of their free ligands. The in-silico inhibition of the 1fj4 protein was investigated using molecular docking. ZnLQ complex was the one that inhibited the 1fj4 protein with the greatest degree of success. The fact that this is the case lends credence to the notion that these compounds have the potential to function as launchpads for the development of new classes of antibiotics. KEY WORDS: Metal complexes, Schiff-base, Antimicrobial, DFT, Molecular docking Bull. Chem. Soc. Ethiop. 2024, 38(1), 147-166. DOI: https://dx.doi.org/10.4314/bcse.v38i1.12
本框架的目标是设计、合成和表征新的单核 1:1:1 (M:L:Q) 混合配体复合物,包括 FeLQ、CoLQ、NiLQ、CuLQ 和 ZnLQ。其中 "L "是 4-[(4-氧代-4,5-二氢-1,3-噻唑-2-基)肼基]甲基苯基 4-甲基苯磺酸盐,而 "Q "是 8-羟基喹啉。根据研究结果,L 和 Q 配体分别扮演中性双齿 NN 和单碱性双齿 ON 配体的角色。研究结果显示了八面体形状。研究人员采用密度泛函理论(DFT)技术并评估了量子化学描述符,以优化化合物的分子结构。对化合物的抗菌和抗真菌活性进行了体外研究。研究结果表明,作为抗生素和抗真菌剂的潜在候选化合物,金属复合物的活性远远高于其游离配体。研究人员使用分子对接法研究了 1fj4 蛋白的体内抑制作用。ZnLQ 复合物最成功地抑制了 1fj4 蛋白。事实证明,这些化合物具有开发新型抗生素的潜力。 关键字:金属配合物 席夫碱 抗菌 DFT 分子对接 Bull.Chem.Soc.2024, 38(1), 147-166.DOI: https://dx.doi.org/10.4314/bcse.v38i1.12
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引用次数: 0
Evaluation of physiochemical and electrochemical behaviour of reduced grapheme functionalized copper nanostructure as an effective corrosion inhibitor 评估作为有效缓蚀剂的还原石墨烯功能化纳米铜结构的理化和电化学行为
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.20
Haewon Byeon, K. Haribabu, Giriraj Kiradoo, V. S. Sreenivasan, M. Sivaprakash, S. Richard, J. Sunil
This study examines the physicochemical properties and corrosion resistance of hydrothermally produced copper oxide-reduced graphene oxide nanocomposite (CuO/rGO). The CuO/rGO nanocomposite has a well-defined and homogeneous structure, decreased crystal size, and uniformly distributed CuO nanoparticles tethered to the rGO. X-Ray diffraction confirms the fabrication of 15.1 nm crystalline monoclinic CuO nanoparticles. EDX confirms the composite's composition by detecting Cu, O, and C components. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (LSV) tests evaluate the CuO/rGO nanocomposite's corrosion resistance. A mild steel plate under an HCl electrolyte with corrosion in the PPM ratio treats the nanocomposite-coated substrate. The composite's synergistic effect is assessed by comparing its corrosion performance to CuO/rGO concentrations in ppm. The corrosion resistance data demonstrate that the CuO/rGO composite improves with inhibitor concentrations of 0, 25, 50, 75, and 100 ppm. Adding rGO to the composite protects it and speeds up charge transfer, reducing corrosion and improving stability. The composite's synergistic effect of CuO and rGO provides excellent corrosion resistance regardless of concentration, making it a viable material for corrosion-prone applications. The research develops novel and effective anti-corrosion methods to preserve materials in the food, automotive, and large-scale energy industries. KEY WORDS: CuO/rGO nanocomposite, Tafel plot, Corrosion protection, Surface analysis Bull. Chem. Soc. Ethiop. 2024, 38(1), 269-280. DOI: https://dx.doi.org/10.4314/bcse.v38i1.20
本研究探讨了水热法制备的氧化铜还原氧化石墨烯纳米复合材料(CuO/rGO)的理化性质和耐腐蚀性能。CuO/rGO 纳米复合材料结构清晰、均匀,晶体尺寸减小,CuO 纳米粒子均匀分布在 rGO 上。X 射线衍射证实了 15.1 纳米结晶单斜 CuO 纳米粒子的制造。通过检测 Cu、O 和 C 成分,EDX 证实了复合材料的成分。电化学阻抗光谱(EIS)和电位极化(LSV)测试评估了 CuO/rGO 纳米复合材料的耐腐蚀性。低碳钢板在盐酸电解液中以 PPM 的腐蚀比处理纳米复合材料涂层基底。通过比较以 ppm 为单位的 CuO/rGO 浓度的腐蚀性能,评估了复合材料的协同效应。耐腐蚀性数据表明,CuO/rGO 复合材料在抑制剂浓度为 0、25、50、75 和 100 ppm 时均有改善。向复合材料中添加 rGO 可保护复合材料并加快电荷转移,从而减少腐蚀并提高稳定性。无论浓度如何,CuO 和 rGO 复合材料的协同效应都能提供出色的耐腐蚀性,使其成为易腐蚀应用领域的一种可行材料。该研究为食品、汽车和大型能源行业的材料防腐开发了新颖有效的防腐方法。 关键字:CuO/rGO 纳米复合材料,塔菲尔图,腐蚀防护,表面分析 Bull.Chem.Soc.2024, 38(1), 269-280.DOI: https://dx.doi.org/10.4314/bcse.v38i1.20
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引用次数: 0
Kinetics, isotherms, and thermodynamic modeling of light lanthanides(III): La(III) and Gd(III) using Mn–Ni nanoparticles 轻镧系元素(III)的动力学、等温线和热力学模型:使用锰镍纳米颗粒的 La(III) 和 Gd(III)
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.19
Y. F. El-Aryan
The sorption of light lanthanides, La(III) and Gd(III) on Mn–Ni nanoparticle was studied at varying ions concentrations, pH, contact time and temperatures. The kinetics of sorption of La(III) and Gd(III) were investigated, the experimental data were analyzed using the pseudo-first-order, pseudo-second-order forms, Elovich, and intra-particle diffusion models. The sorption kinetics of investigated ions was described by pseudo-second-order model. The experimental isotherms data were analyzed using Freundlich, Langmuir, and Temkin models were used to analyze the sorption isotherm data of ion exchange of La(III) and Gd(III) on Mn–Ni nanoparticle. The best fit was obtained by the Langmuir model with high correlation coefficients (R2 = 0.995) with a maximum monolayer adsorption capacity of 8.81 mg/g. KEY WORDS: Sorption isotherm, Kinetics models, Mn–Ni nano particle Bull. Chem. Soc. Ethiop. 2024, 38(1), 255-267. DOI: https://dx.doi.org/10.4314/bcse.v38i1.19
在不同的离子浓度、pH 值、接触时间和温度条件下,研究了轻镧系元素 La(III) 和 Gd(III) 在 Mn-Ni 纳米粒子上的吸附情况。研究了 La(III) 和 Gd(III) 的吸附动力学,并使用伪一阶、伪二阶、埃洛维奇和颗粒内扩散模型对实验数据进行了分析。研究离子的吸附动力学用假一阶模型描述。利用 Freundlich、Langmuir 和 Temkin 模型分析了锰-镍纳米粒子上 La(III) 和 Gd(III) 离子交换的吸附等温线实验数据。结果表明,Langmuir 模型的拟合效果最好,相关系数高(R2 = 0.995),最大单层吸附容量为 8.81 mg/g。 关键字:吸附等温线、动力学模型、锰镍纳米粒子 Bull.Chem.Soc.2024, 38(1), 255-267.DOI: https://dx.doi.org/10.4314/bcse.v38i1.19
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引用次数: 0
Influence of heavy metal ions and storage time on hydroxymethylfurfural formation in honey collected from Ilu Woreda, Oromia Regional State, Ethiopia 重金属离子和储存时间对埃塞俄比亚奥罗米亚州 Ilu Woreda 收集的蜂蜜中羟甲基糠醛形成的影响
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.1
Tsedeke Birhanu, T. Tolcha
The effect of heavy metals on the formation of hydroxymethyl furfural (HMF) from degradation of reducing sugars in honey collected from Ilu Woreda, West Shewa Zone of Oromia Regional State, Ethiopia were studied. The concentration level of Pb, Cd, Cr and Ni in honey sample was determined using AOAC Official Method. The concentration of HMF in honey was determined using international honey commission standards. The concentrations of heavy metals in fresh honey were 11 ± 0.001, 454 ± 0.002, 630 ± 0.001 and 1 ± 0.001 µg kg-1 for Pb, Cr, Ni and Cd, respectively. The influence of heavy metals on the formation of HMF in honey samples was studied on 5, 30 and 60 days after spiking at concentration level of 10,000 µg kg-1 of each heavy metal. The concentration of HMF for untreated honey samples was ranged 1380-2200 µg kg-1 for the storage time of 5, 30 and 60 days. The concentration of HMF in honey samples spiked with Pb, Ni, Cr and Cd were found to be in the range of 2100-2150, 1900-2430, 2100-2270 and 2050-2330 µg kg-1, respectively. The results of this study indicate that contamination of honey with heavy metal facilitate the formation of HMF. KEY WORDS: Fresh honey, HMF, Heavy metal ions, HPLC-DAD and Honey quality Bull. Chem. Soc. Ethiop. 2024, 38(1), 1-10. DOI: https://dx.doi.org/10.4314/bcse.v38i1.1
研究了重金属对埃塞俄比亚奥罗米亚州西谢瓦区伊卢镇收集的蜂蜜中还原糖降解形成羟甲基糠醛(HMF)的影响。采用 AOAC 官方方法测定了蜂蜜样品中铅、镉、铬和镍的浓度水平。蜂蜜中 HMF 的浓度采用国际蜂蜜委员会标准进行测定。新鲜蜂蜜中铅、铬、镍和镉的重金属浓度分别为 11 ± 0.001、454 ± 0.002、630 ± 0.001 和 1 ± 0.001 µg kg-1。在每种重金属的浓度水平为 10,000 µg kg-1 时,分别在添加后 5 天、30 天和 60 天研究重金属对蜂蜜样品中 HMF 生成的影响。未经处理的蜂蜜样品在 5 天、30 天和 60 天的 HMF 浓度范围为 1380-2200 µg kg-1。在添加了铅、镍、铬和镉的蜂蜜样品中,发现 HMF 的浓度范围分别为 2100-2150、1900-2430、2100-2270 和 2050-2330 µg kg-1。研究结果表明,蜂蜜受到重金属污染会促进 HMF 的形成。 关键词:新鲜蜂蜜、HMF、重金属离子、HPLC-DAD 和蜂蜜质量 Bull.Chem.Soc.2024, 38(1), 1-10.DOI: https://dx.doi.org/10.4314/bcse.v38i1.1
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引用次数: 0
Synthesis and characterization of hybrid nanocatalyst (AgNPs-Fe2O3) for catalytic remediation of hazardous 2,4-dinitrophenol 用于催化修复有害的 2,4-二硝基苯酚的混合纳米催化剂(AgNPs-Fe2O3)的合成与表征
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.9
M. Sivakavinesan, M. Vanaja, M. Anto-Rishiba, E. Amutha, G. Annadurai, R. Mariselvam, Tahani Tahani Awad Alahmadi, Sulaiman Ali Alharbi, G. Tamilselvan
Hybridized nanocatalysts (AgNPs-Fe2O3) were prepared with silver nitrate and ferric chloride in the presence of sodium borohydride. The synthesized nanocatalyst was calcined, milled, and sieved for further applications. The nanocatalyst was characterized using Fourier transform infrared spectroscopy (FTIR) for the identification of functional moieties involved in the synthesis of the nanocatalyst. The vibrations of Fe and Ag were found at 566, 790 and 892 cm-1. The crystalline nature of the nanocatalyst was determined using X-ray diffraction (XRD) studies. The diffraction peaks for Ag and Fe can be seen at 2θ values of 30.42, 44.36, 62.45, 42.24 and 53.25. The morphology and elemental analysis of nanocatalysts were studied using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX). The particles are found to be spherical in shape. The signal for Ag and Fe can be found at 3.0 keV and 0.7, 6.3, 7.0 keV, respectively. The synthesized nanocatalyst was employed in the remediation of 2,4-dinitrophenol. The AgNPs-Fe2O3 nanocatalyst completely reduced (97%) the 2,4-dinitrophenol to 2,4-diaminophenol within 24 h. KEY WORDS: Nanocatalyst, Chemical precipitation, Impregnation methodology, Milling, Sieving, Remediation Bull. Chem. Soc. Ethiop. 2024, 38(1), 113-121. DOI: https://dx.doi.org/10.4314/bcse.v38i1.9
在硼氢化钠存在下,用硝酸银和氯化铁制备了杂化纳米催化剂(AgNPs-Fe2O3)。合成的纳米催化剂经煅烧、研磨和筛分后可进一步应用。使用傅立叶变换红外光谱(FTIR)对纳米催化剂进行了表征,以确定纳米催化剂合成过程中涉及的功能分子。在 566、790 和 892 cm-1 处发现了铁和银的振动。通过 X 射线衍射 (XRD) 研究确定了纳米催化剂的结晶性质。在 2θ 值为 30.42、44.36、62.45、42.24 和 53.25 处可以看到银和铁的衍射峰。使用扫描电子显微镜(SEM)和能量色散 X 射线光谱(EDAX)对纳米催化剂的形态和元素分析进行了研究。发现颗粒呈球形。银和铁的信号分别出现在 3.0 keV 和 0.7、6.3、7.0 keV 处。合成的纳米催化剂被用于 2,4-二硝基苯酚的修复。AgNPs-Fe2O3 纳米催化剂在 24 小时内将 2,4-二硝基苯酚完全还原为 2,4-二氨基苯酚(97%)。 关键词: 纳米催化剂 化学沉淀 浸渍法 研磨 筛分 修复 Bull.Chem.Soc.2024, 38(1), 113-121.DOI: https://dx.doi.org/10.4314/bcse.v38i1.9
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引用次数: 0
Determination of calcium in water samples by using Au-electrode in HCl solution in the absence and presence of a crystal violet and environmental studies 在无结晶紫和有结晶紫的盐酸溶液中使用金电极测定水样中的钙含量及环境研究
IF 1.2 4区 化学 Q3 Chemistry Pub Date : 2023-11-29 DOI: 10.4314/bcse.v38i1.4
Safa Q. Hussien, Mohamed M. El-Defrawy, Esam A. Gomaa, Marwa G. El-Ghalban
The hydrochloric acid (HCl 0.1 M) supporting electrolyte was used in the electrochemical estimation cyclic voltammetry for CaCl2 concentrations also using crystal violet dye or (hexamethyl pararosaniline) as ligand. For oxidation and reduction waves, the potential range is 0.5 V, -0.5 V. The interaction of calcium ions with crystal violet was examined using several analytical estimates, and kinetic and thermodynamic parameters. The analytical concentration for calcium ions in different samples especially in Nile River were estimated in the range from 1.6 to 14.3 mmol. The estimation of calcium ion concentrations was achieved up to 11.49 mmol in waste water in Mansoura University. Applications were made for calcium estimation of different water samples and molecular docking of the calcium-crystal violet complex against the Hepatitis C viral proteins (4i33, 4KTC), roving strong bonds of interaction were observed. And anti-bacterial effect on calcium complex with crystal violet and face mask N-95 tissue. KEY WORDS: Calcium ions, Thermodynamic properties, Solvation parameters, Nile water samples, Anti-bacterial, Molecular docking Bull. Chem. Soc. Ethiop. 2024, 38(1), 43-54. DOI: https://dx.doi.org/10.4314/bcse.v38i1.4
盐酸(HCl 0.1 M)支持电解质被用于对 CaCl2 浓度进行电化学估计循环伏安法,同时使用水晶紫染料或(六甲基对位氨基苯胺)作为配体。氧化波和还原波的电位范围为 0.5 V、-0.5 V。利用几种分析估计值以及动力学和热力学参数对钙离子与水晶紫的相互作用进行了研究。不同样品(尤其是尼罗河中的样品)中钙离子的分析浓度估计范围为 1.6 至 14.3 mmol。在曼苏拉大学的废水中,钙离子浓度的估算值高达 11.49 mmol。应用该方法对不同水样进行了钙估算,并对钙-水晶紫复合物与丙型肝炎病毒蛋白(4i33、4KTC)进行了分子对接,观察到了强相互作用键。钙与水晶紫复合物与面膜 N-95 组织的抗菌效果。 关键词:钙离子;热力学性质;溶解参数;尼罗河水样;抗菌;分子对接 Bull.Chem.Soc.2024, 38(1), 43-54.DOI: https://dx.doi.org/10.4314/bcse.v38i1.4
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Bulletin of the Chemical Society of Ethiopia
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