Open Journal of Chemistry
Published by: Peertechz Publications Private Limited
Total articles ≅ 30
Latest articles in this journal
Published: 11 March 2023
Open Journal of Chemistry, Volume 9, pp 001-005; https://doi.org/10.17352/ojc.000030
The quality of polluted wastewater processed by conventional Wastewater Treatment Plants (WWTPs) is in some cases insufficient to reach the degree of purity required. Pharmaceuticals are frequently identified in the aquatic environment, owing to their constant release from WWTPs. Thus, in recent years, they are cataloged as pseudo-persistent pollutants having been recognized as potentially harmful to public health and environmental concern. This work has focused on the removal of 3 antihypertensive pharmaceuticals (furosemide, irbesartan, and valsartan) from aqueous waste solutions using a sequential biological-photocatalytic (TiO2/Na2S2O8) treatment under natural sunlight. Pharmaceutical residues were isolated from water by solid phase extraction (SPE) and analyzed by HPLC-QqQ-MS2. Biodegradation was greater than 65% and 70% for irbesartan and furosemide, respectively, while valsartan was highly biodegradable (> 96%). Next, photocatalytic treatment was applied and just 200 kJ m-2 was required to remove 90 % of micropollutants residues from the effluent. Therefore, the coupling of biological treatment to solar heterogeneous photocatalysis constitutes a valuable instrument to detoxify polluted wastewater.
Published: 14 October 2022
Open Journal of Chemistry, Volume 8, pp 008-013; https://doi.org/10.17352/ojc.000029
Background: One of the plants used in Indonesian traditional medicine Libho (Ficus Septica Burm. F) is traditionally used to treat some diseases, including malaria, diarrhea, diabetes, analgesic, antifungal, dysentery, anthelmintic, antioxidant, hemostatic and anti-inflammatory. Purpose: The purpose of the study is to investigate the potential in vitro antioxidant activity assay and phytochemical content of Libho fruits. Methods: Libho leaves powder was extracted with the maceration method Antioxidant activity was evaluated using ABTS cation and CUPRAC radicals. Total phenolic content was determined using the Folin-Ciocalteau method. Meanwhile, the total flavonoid content was determined using the aluminum chloride complex colorimetric method; Results: Extract and fraction of Ficus Septica Burm. F fruits have the strongest antioxidant potential. The ethyl acetate fraction showed the strongest antioxidant activity on both ABTS and CUPRAC radicals with IC50 values of 6.33 ± 0.01 µg/mL and 11.64 ± 0.28 µg/mL, respectively. Ethyl acetate fraction also showed high phenolic and flavonoid content with values of 28 ± 0.05 mg GAE/100 mg sample and 43.08 ± 0.48 mg QE/100 mg sample, respectively. Conclusion: Ethyl acetate fraction has the potential to be used as a source of natural antioxidants and has the potential to be used as a nutraceutical.
Published: 1 October 2022
Open Journal of Chemistry, Volume 8, pp 001-007; https://doi.org/10.17352/ojc.000028
Eight new optically pure calixarene derivatives, in which their lower rims were substituted with Evans oxazolidinone or pyranose moieties, are described. All macrocycles were fully characterized by NMR spectroscopy, optical rotation, and elemental analysis. The introduction of chiral auxiliaries reduced the symmetry of the macrocycle as observed by NMR. Stereospecific alkylation on the Evans oxazolidinone moiety allowed the asymmetric introduction of a methyl substituent near a phenolic position of the macrocycle.
Published: 14 December 2021
Open Journal of Chemistry pp 034-034; https://doi.org/10.17352/ojc.000027
Rapid growth in population, Concerns about the industrial revolution, environmental and energy issues are growing, and are urging the use of clean, renewable energy sources to ameliorate the dire situation. Hydrogen is an ideal synthetic fuel because it is light, very broad, and is an oxidation product (water), i.e. environmentally friendly, but storage problems remain [1-3].
Published: 10 July 2021
Open Journal of Chemistry, Volume 7, pp 029-033; https://doi.org/10.17352/ojc.000026
Published: 18 February 2021
Open Journal of Chemistry, Volume 7, pp 025-028; https://doi.org/10.17352/ojc.000025
Published: 6 January 2021
Open Journal of Chemistry pp 004-021; https://doi.org/10.17352/ojc.000023
The electronegativity-equalization at several hypothetical stages of chemical reactions is reexamined and phase-equalization in open substrates is explored. The equivalence of the energy and information reactivity criteria is stressed and local energy concept is shown to determine time-evolutions of wavefunction components. Independent sources of information content in electronic states are identifi ed and the need for resultant entropy-information measures in quantum mechanics, combining information contributions due to the classical (probability) and nonclassical (phase/current) distributions, is reemphasized. Limitations for a simultaneous removal of uncertainties in the position and velocity distributions imposed by the Heisenberg indeterminacy principle, are discussed, continuities of the wavefunction modulus and phase components are examined, the convectional character of the local source of resultant gradient information is stressed, and a latent (“horizontal”) probability currents in the stationary quantum states are discussed.
Published: 5 January 2021
Open Journal of Chemistry, Volume 7, pp 001-003; https://doi.org/10.17352/ojc.000022
Published: 11 December 2020
Open Journal of Chemistry, Volume 6, pp 030-036; https://doi.org/10.17352/ojc.000021
Published: 17 November 2020
Open Journal of Chemistry, Volume 6, pp 021-029; https://doi.org/10.17352/ojc.000020