Publisher: Sami Publishing Company   (Total: 3 journals)   [Sort by number of followers]

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Advanced J. of Chemistry, Section A     Open Access   (Followers: 3)
Advanced J. of Chemistry, Section B     Open Access   (Followers: 1)
J. of Chemical Reviews     Open Access  
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Advanced Journal of Chemistry, Section B
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2716-9634
Published by Sami Publishing Company Homepage  [3 journals]
  • Evaluation of Metal Composition of Cast Iron Disc Used in Local Grinding
           Machine

    • Abstract: The need to prevent metal-related sickness is the driving force for this research. The research evaluates the composition and concentration of metals present in cast iron grinding disc used for local grinding. Different acidic mixtures were used to digest the pulverized cast-iron disc, and atomic absorption spectrophotometric analysis revealed the presence of essential minerals such as iron, copper, zinc, manganese, and toxic metals like metals cadmium, chromium, lead, and nickel. The concentration of the metals varies in different ranges cadmium 0.73 to 3.44, chromium 0.88 to 6.80, lead 0.55 to 1.58, nickel 0.40 to 7.17, manganese 3.12 to 21.00, zinc 2.03 to 40.50, iron 1.93 to 49.16 and copper 3.00 to 26.92 all in mg/kg. The presence of heavy metals in the grinding disc could be a source of food contamination and possible potential health risks.
       
  • Syntheses, Characterization and Biological Evaluation of Some New
           (2E)-1-(4'-bromophenyl)-3-(4-(diphenylamino)phenyl)prop-2-en-1-one
           Chalcones and their analogues

    • Abstract: Eight novel triphenylamine chalcones with different substitution patterns were successfully synthesized using the conventional Claisen-Schmidt condensation reaction in basic medium at room temperature, and purified by recrystallization method using ethanol, the percentage yield of the compounds were between 30 – 92 %. The synthesis of the target chalcones involves a nucleophilic enolate attack on the electrophilic carbonyl carbon of 4-(Diphenylamino) benzaldehyde resulting in the formation of a new carbon-carbon bond. The triphenylamine chalcones were characterized by means of FT-IR and NMR spectroscopic analyses. The antimicrobial screening against different pathogens revealed that, all synthesized compounds showed marked activity against the tested microbe. (E)-3-(4-(diphenylamino)phenyl)-1-(3'-nitrophenyl)prop-2-en-1-one (1b) showed the highest zone of inhibition against Aspergillus niger, measuring 30 mm. The minimum inhibitory concentration (MIC) results revealed that, (E)-1-(4'-bromophenyl)-3-(4-(diphenylamino)phenyl)prop-2-en-1-one (1a), (E)-3-(4-(diphenylamino)phenyl)-1-(3'-nitrophenyl)prop-2-en-1-one (1b), (E)-1-(4'-chlorophenyl)-3-(4-diphenylamino)phenyl)prop-2-en-1-one (1c), (E)-3-(4-diphenylamino)phenyl)-1-(4'-fluorophenyl)prop-2-en-1-one (1d) and (E)-4-(3-(diphenylamino)phenyl)-1-(4-fluorophenyl)-2-methylbut-3-en-1-one (2d) had the lowest MIC and inhibit Aspergillus niger growth at 12.5 µg/ml. All the synthesized compounds showed an MBC/MFC effect against Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Candida albicans and Aspergillus niger at 50 µg/ml.
       
  • Determination of Total Phenolic Compounds and Antioxidant Capacity of
           Rosmarinus officinalis L. via Microwave-Assisted Extraction

    • Abstract: Due to the toxicity of synthetic antioxidants, their application has been limited or even banned in certain countries. The extraction of phenolic compounds and flavonoids from plant matrices is carried out utilizing a variety of solvents. The aim of this study is to determine the antioxidant activity and total phenolic and flavonoid composition of  Rosmarinus officinalis L., often referred to as rosemary. The study also examines the potential application of rosemary as a natural antioxidant in the food industry. The extraction technique in this study included maceration and microwave-assisted extraction. Maceration was chosen as the traditional extraction technique, while microwave-assisted extraction was used to reduce the extraction time and solvent volume. In both the traditional and microwave-assisted extraction methods, methanol was employed as a solvent. The total phenolic compounds, total flavonoids, antioxidant activity, metal chelating ability, and beta-carotene and lycopene levels of the samples were determined. TPC yielded 40 and 43 mg/g, TFC yielded 12.4 and 20 mg/g, FRAP yielded 37 and 49 mg/g, and MCC yielded 133 and 134 mg/g, respectively, for conventional and microwave-assisted extraction methods. In comparison to the conventional technique, the microwave-assisted extraction method resulted in greater quantities of bioactive compounds. Additionally, rosemary's beta-carotene and lycopene contents were determined to be 8652 and 7849 mg/g dried plant, respectively. Microwave-assisted extraction was found to be more successful, quicker, and less solvent-intensive than the conventional method. Additionally, rosemary is suggested in the food sector as a natural antioxidant instead of a synthetic antioxidant to prevent health-damaging consequences.
       
  • The Contents of some Macro and Trace Elements in Uniflora and Multiflora
           Honey Samples Collected from Three Regions in East Libya

    • Abstract: Honey is used for nutritional, therapeutic and manufacturing purposes and it is a significant product in the global market. Honey is defending as a natural indicator of floral biodiversity and environmental quality. In this study, the levels of some macro and trace elements (main mineral contents) including numbers of heavy metalswere evaluated in honey samples from beekeepers in three different regions in east Libya including Benghazi, Maraj and Ajdabiya, during 2018.These samples include; uniflora and multiflora honey. The levels of ten elements were measured; sodium (Na), calcium (Ca), potassium (K),magnesium (Mg), zinc(Zn), iron(Fe), copper (Cu), aluminium (Al) and toxic elements; such as lead (Pb) and cadmium (Cd), by using flame atomic absorption spectrometry (FAAS).The results showed, the ranges of macro minerals, Na, Ca, K and Mg varied from 10.93-32.30,39.14-298.5, 176.24-734.28 and 12.62-55.26mg/kg, respectively, and the ranges of trace and toxic elements, Zn, Fe, Cu, Al, Cd and Pb varied from 0.428-2.508, 0.248-0.720, 0.021-0.610, 0.009-0.0423, 0-0.011 and0-0.009 mg/kg, respectively. Also, the concentration of all elements was statistically significant difference within all samples (P<0.05), except Zn. The levels of macro and trace elements in the selected Libyan honey samples were variable, while Cd and Pb elements were detected in few honey samples and not detected in the rest. This study reveals that Libyan honeys were of high quality, rich in minerals and safe with trace elements present within permissible limits of the Libyan Standard Legislation.
       
  • Crystal structure, Hirshfeld surface, Energy framework, and Molecular
           docking analysis of 4-(methoxyphenyl)acetic acid

    • Abstract: The crystal structure of (4-methoxyphenyl) acetic acid (C9H10O3) exists in the monoclinic space group P21/c having unit cell parameters: a = 16.268 (15), b = 5.858 (5), c = 9.157 (8) Å, β = 95.24 (2)°, and Z = 4. The structure has been solved by X-ray diffraction methods and it converges to a final reliability index of 0.0620 for 1117 observed reflections. Two intermolecular hydrogen bonds of the type C-H....O and O-H....O have been observed. The O-H....O hydrogen bond leads to the formation of a dimer with R22 (8) graph set motif and it is found linked to another C-H....O intermolecular hydrogen bond. The molecule has been characterized for Hirshfeld surface, energy frameworks and molecular docking studies. The Hirshfeld surface (HS) analysis was performed for the identification of all the close contacts and their strength in the crystal structure. The energy frameworks were analyzed to examine the molecular stability and also to ascertain the dominant energy component. The molecular docking investigations lead to the finding that (4-methoxyphenyl)acetic acid may act as an active anti-microbial (antibacterial and antifungal) drug.
       
  • Computational study of the effectiveness of natural herbal derivatives on
           COVID-19 virus

    • Abstract: In the present paper, an attempt has been made to study the COVID-19 virus that caused hundreds of thousands of deaths and instigated widespread fear, threatening the world’s most advanced health security. In 2020, natural herbal derivatives are among the drugs tested against the coronavirus pandemic and showed an apparent efficacy. In the present work, We report a systematic study of e-learning by chemical computing the natural herbs have been proposed as a potential antiviral for the treatment of COVID-19 diseases combining DFT and molecular docking calculations Molecular geometries, electronic properties, and molecular electrostatic potential were investigated by using software Hyperchem 08, where the internal energy of seasonal influenza virus and COVID-19   respectively,   (-1678.045 kcal/mol)  and  (-3020 kcal/mol) to find that the difference in energy is twice for seasonal influenza, which makes the kinetic energy high for     COVID-19 Which is attributable to the high temperature and headache for people with it, so that internal energy of the plants used as a temporary treatment (Thyme, Anise, Cinnamon, and Eugenol) respectively (4.056 kcal/mol, -47.40 kcal/mol, -53.83 kcal/mol,  -218.84 kcal/mol) which is anise closest in internal energy of the virus COVID-19 so, remains incomplete, will be as a temporary protector as a reliever in case of infection.   
       
  • A Highly Sensitive Colorimetric Determination of Paraquat by Silver
           Nanoparticles

    • Abstract: In this work, we describe a simple, selective and sensitive colorimetric method for the detection of Paraquat. In this approach, the synthesized silver nanoparticles (AgNPs) solution was stabilized by the citrate anions which repulsed and protected the AgNPs from aggregation. Paraquat was added to AgNPs solution and was incubated to react for 6 min. The resulting mixture color was changed. These processes were studied and characterized by UV-Vis spectroscopy. Several parameters such as size and concentration of nanoparticles, reaction time and pH of medium that governed the analytical performance of the method have been studied in detail and optimized. Paraquat could be selectively detected in concentration range from 0.1to 0.02μM with a limit of detection as 0.01μM. Some common ions such Mg+2, Au+2, Cd+2 and No3- showed no interference in the determination of Paraquat.
       
 
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