2020 Volume 15, no.1
Author(s): Alexandra Marcu, Gabriela Lisa, Ioana-Emilia Sofran, Ion Anghel, Manuel Serban
Field: Industrial chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 58-66
Keywords: waste, biomass pellet, combustion heat, thermogravimetric analysis, microscale combustion calorimetry.
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Graphical Abstract: This paper tackles the potential uses of agricultural wastes (sawdust, sunflower seed shells, pumpkin seed shells, cherry pits, walnut shells, and green walnut shells) for the production of pellets. Combustion heat was determined for these wastes and their thermal decomposition in an air atmosphere was analysed. Five types of mini-pellets were made from different combinations of available wastes and their thermal behaviour was analysed by the microscale combustion calorimetry method.
Downloads: 269
Author(s): Elena Culighin
Field: Ecological chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 41-50
Keywords: pesticide, hexachlorocyclohexane, dichlorodiphenyltrichloroethane, soil, Republic of Moldova.
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Abstract (PDF)
Graphical Abstract: The level, composition, and distribution of hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT) residues were determined by GC-ECD technique in soil samples from the Soroca district, Republic of Moldova. The concentrations of DDTs and HCHs were up to 1100 and 640 mg/kg, respectively. The high concentration and the degradation rates of the pesticides in soil suggest that the contaminated sites are acting as continuous sources of pollution for the environment. Thus, remediation measures are required to reduce the level of the contaminants in soil.
Downloads: 378
Author(s): Olga Kazakova, Roman Ivannikov, Iryna Laguta, Oksana Stavinskaya, Viktor Anishchenko, Olga Severinovska, Ludmila Buyun
Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 95-102
Keywords: orchid extract, phenolic compound, HPLC, fumed silica, quantum chemical calculation.
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Graphical Abstract: The most common phenolic components of sixteen orchid extracts were identified using high performance liquid chromatography and laser desorption/ionization mass spectrometry. The interaction between these compounds and silica silanol groups was studied using quantum chemical calculations. Results show that the strength of the interaction of phenols with silica increased in the following order: ferullic, feruloylquinic and fertaric acids <kaempferol, apingenin <<сhlorogenic and caffeic acids, rhamnetin, quercetin, luteolin, epicatechin gallate. The common feature of compounds characterized by the strongest interaction with silanol groups is the presence of phenol ring with two neighbouring hydroxyl groups.
Downloads: 180
Author(s): Imeda Rubashvili, Natela Karukhnishvili, Khatuna Makharadze
Field: Analytical chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 8-21
Keywords: lisinopril, hydrochlorthiazide, swab sampling, rinse sampling, HPLC, validation.
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Abstract (PDF)
Graphical Abstract: A new, rapid and selective, HPLC method for simultaneous quantitative estimation of lisinopril and hydrochlorothiazide residues and sampling procedures from pharmaceutical manufacturing equipment surfaces were developed and validated. The sampling procedures have a good recovery (>80%). The limit of quantitation of the HPLC method - 0.155 µg/mL and 0.025 µg/mL for lisinopril and hydrochlorothiazide, respectively.
Downloads: 177
Author(s): Syed Sauban Ghani, Aman Deo
Field: Food chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 51-57
Keywords: heavy metal, accumulation, fish, marine environment, Pacific Ocean.
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Abstract (PDF)
Graphical Abstract: The concentrations of the accumulated heavy metals such as cadmium, lead, copper, mercury, zinc, and chromium have been determined in the muscles, gills and liver of the fish species of
Clupea pallasii,
Macolor niger and
Pristipomoides filamentosus collected from the waters of the South Pacific Ocean around Lautoka in Fiji. Overall, the contents of heavy metals in all the samples were below the permissible limits, except for chromium that is slightly higher than the limit set by Food and Agriculture Organization of the United Nations and World Health Organization regulations, respectively. As anticipated, the muscles are still near the lowest concentration of all metal concentration. Significant variations in heavy metal concentrations were found between different tissues within each species of fish.
Downloads: 163
Author(s): Gunel Mamedova
Field: Ecological chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 31-40
Keywords: hydrothermal synthesis, zeolite, gismondine, laumontite, levyne.
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Abstract (PDF)
Graphical Abstract: Gismondine, laumontite and levyne type zeolites have been synthesized based on the natural minerals of Nakhchivan and the optimal crystallization conditions have been established. The initial components and the reaction products have been examined by X-ray diffraction, thermogravimetric and elemental analysis. It was found that changes in the temperature, alkalinity, ratio of starting components and time of processing of the reaction have different effects on the rate of formation of products, on their degree of crystallinity and on the phase purity of the obtained zeolite.
Downloads: 777
Author(s): Daniela Guglietta, Girolamo Belardi, Giovanna Cappai, Barbara Casentini, Alicia Godeas, Stefano Milia, Daniele Passeri, Rosamaria Salvatori, Adalgisa Scotti, Vanesa Silvani, Emanuela Tempesta, Stefano Ubaldini, Francesca Trapasso
Field: Ecological chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 21-30
Keywords: mining waste, metal recovery, recycle, remote sensing analysis.
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Graphical Abstract: The aim of this paper is to evaluate an integrated multidisciplinary strategy for the characterization of mining waste, their possible recycling and reuse. The use of Fe-Mn rich wastes in arsenic removal and phosphorus recovery from water and the phytoextraction potential of metals and their possible recovery from biomass are evaluated.
Downloads: 136
Author(s): Koba Amirkhanashvili, Alexandre Sobolev, Nani Zhorzholiani, Vladimer Tsitsishvili
Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 67-74
Keywords: lidocaine complex, nickel(II), crystal structure, hydrogen bond.
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Abstract (PDF)
Graphical Abstract: This paper reports on the synthesis and structure re-refinement of bis(lidocaine) diaquatetrathiocyanatonickelate(II). The compound with the formula (LidH)
2[Ni(NCS)
4(H2O)
2], where Lid is (2-(diethylamino)-
N-(2,6-dimethylphenyl)acetamide, crystallizes in the monoclinic space group
P21/c with
a= 18.3509(5),
b= 7.6532(2),
c= 14.9585(4) Å,
β= 109.964 (2)°,
V= 1974.57 (9) Å
3, and
Z= 2. Coordination of the Ni
2+ ion with thiocyanate ions and water molecules generates slightly distorted octahedral anion [Ni(NCS)
4(H2O)
2]
2– with
N-bonded thiocyanate groups, while two protonated cations LidH
+ remain in an outer coordination field.
Downloads: 150
Author(s): Lauro Figueroa, Alejandra Garcimarero, Rolando Garcia, Francisco Diaz, Marcela Rosas, Virginia Mateu, Maria Lopez, Lenin Hau, Tomas Lopez, Abelardo Camacho, Yaritza Borges
Field: Organic chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 75-85
Keywords: bicyclo, steroid, estrone derivative, synthesis, NMR.
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Abstract (PDF)
Graphical Abstract: This study describes the preparation of two bicyclo[3.3.3]nonane-steroid derivatives from either estradiol or estrone using some reactions such as etherification, addition, nucleophilic substitution and cyclization. The chemical structure was evaluated through NMR spectroscopic analysis. The results showed higher yield for
11 compared with
12. It is noteworthy that the reagents used in this investigation are not expensive and do not require special conditions for handling.
Downloads: 357
Author(s): Hajer Hrichi, Nadia Ali Ahmed Elkanzi, Rania Badawy Bakr
Field: Organic chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 86-94
Keywords: heterocycle, β-lactam, quinoxaline, antimicrobial activity, molecular docking.
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Graphical Abstract: A series of novel isolated
β-lactams
3a-c and thiazolidinone derivatives
4a-c were successfully synthesized from reactions of new Schiff's bases
2a-c with chloroacetyl chloride and thioglycolic acid. The antimicrobial activity of the obtained compounds was assessed
in vitro against gram-positive
Staphylococcus aureus and gram-negative
Escherichia coli bacteria and
Aspergillus flavus and
Candida albicans fungi. Furthermore, a molecular docking study was carried out and the results indicated that compounds
3b and
4b displayed comparable binding affinity scores as that of glutamate. These two compounds are promising candidates as antibacterial and antifungal agents that would deserve further investigations.
Downloads: 218