Antimicrobial activity and chemical composition of the essential oil of Juniperus communis (L.), originated from east part of Kosova, was investigated. The essential oil from berries of J. communis (L.), obtained by hydro-distillation was analyzed by GC and GC-MS. Antimicrobial properties of the essential oil of J. communis (L.) are investigated and results are submitted for their activities against Staphylococcus aureus, Escherichia coli, Hafnia alvei and Pseudomonas aeruginosa. Applying the agar disc diffusion technique, we measured diameters of the inhibition zone around discs, which are previously wetted with DMF solution of the essential oil with three different concentrations, 1, 3 and 5 mg mL −1 . Analysis of the oil resulted in the identification of 41 peaks, representing 96% of the oil. Berry essential oil composed mainly of monoterpenoids which amounted to 83%, of which 69.4% was monoterpene hydrocarbons. The main monoterpene hydrocarbons were α-pinene (36.2%) and β-myrcene (21.1%). The sesquiterpene accounted for about 13.4% of the total oil composition. Germacrene D (2.2%), α-cadinol (1.6%), α-humulene (1.5%), spathulenol (1.4%), epi-α-bisabolol (1.3%) and germacrene B (1.1%) were the main constituents of the sesquiterpenes. The inhibition zone depends from concentrations and also from sort of bacteria. The inhibition zones differ from 0-39 mm. The present work presents the chemical composition of the hydrodistilled oil of J. communis (L.) from East part of Kosova and the results are compared to those reported in the literature. This study demonstrates the occurrence of α-pinene chemotype of J. communis (L.) from east part of Kosova. The essential oil of J. communis (L.) growing wild in Kosova, showed moderate to high activities against Staphylococcus aureus, Escherichia coli, Hafnia alvei. Pseudomonas aeruginosa is resistant to the essential oil of J. communis (L.) growing wild in east part of Kosova.
Heterogeneous reverse osmosis (RO) membranes have been prepared from cellulose acetate (CA) and modified coal through chemical activation. Nitric acid of various concentrations, sulfuric and acetic acids used for various time periods have been studied with respect to modification of structure of coal and consequently structure of RO membranes. The effect of these variables on the modification of coal was examined by IR spectroscopy. All membranes prepared in such a way showed improved performance in comparison with standard CA membranes. The volume flux of the best RO membranes at 94% level of solute separation was 3.87×10-2 m 3 /(m 2 •h) at 1.76 MPa using aqueous feed solution 400 mg/dm 3 of sodium chloride. The performance improvement was related to increases of charge of groups of coal particles in the membrane, affecting their rheology and morphology resulting in better membrane productivity. The SEM of some membranes have also been presented. These membranes were tested also with 1:1, 1:2, 2:2 and 1:3 inorganic salt solutions. The agreement between the calculated and experimental data of solute separation for studied solutes was reasonably good.
This study presents the synthesis of 7‐iminobenzo[b]chromeno[4,3‐e][1,4]diazepin‐6(7H)‐ones (3–4) by simple reaction of 4‐chloro‐2‐oxo‐2H‐chromene‐3‐carbonitrile with o‐phenylidenediamine. The compounds (3–4) were characterized by elemental analysis data, IR, 1H NMR and mass spectral data. The novel heterocyclic compounds were evaluated for antimicrobial activity against Escherichia coli and Staphylococus aureus using the Kirby‐Bayer method. The novel compounds demonstrated moderate antimicrobial activity.Support or Funding InformationFunding: Support for this study was provided by the Ministry of Education, Science and Technology of the Republic of Kosovo. Grant number:2‐5521‐2This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.
Two novel metal complexes from 7‐iminobenzo[b]chromeno[4,3‐e][1,4]diazepin‐6(7H)‐ones with Ni (II) were synthesized. The ligands and their metal complexes have been characterized by IR, 1H‐NMR, 13C‐NMR, Mass spectra and Elemental analysis. The synthesized ligands and metal complexes were screened for microbiological activity against Escherichia coli ATTC 8739 and Staphylococcus aureus ATTC 25923. The results showed that the metal complexes were found to be more active than free ligands.
Support or Funding Information
Support for this study was provided by the Ministry for Education, Science and Technology of the Republic of Kosovo. Grant number:2‐5521‐2
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