Browsing by Author "Balan, Greta"

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ACTIVITATEA BIOLOGICĂ A COMPUȘILOR COORDINATIVI AI CU(II) ȘI BI(III) CU IONI AMINOPOLICARBOXILAT ȘI TIOSEMICARBAZONE ALE 2-FORMIL ȘI 2-ACETILPIRIDINEI
(CEP USM, 2022-11-10) Neguţa, Elena; Balan, Greta; Gulea, Aurelian; Bulimestru, Ion
ANTIMICROBIAL ACTIVITY OF POLYSACCHARIDE-CONTAINING SPIRULINA EXTRACTS
(CEP USM, 2022-09-29) Zosim, Liliana; Trofim, Alina; Balan, Greta; Rudic, Valeriu; Elenciuc, Daniela
ANTIMICROBIAL AND ANTIFUNGAL ACTIVITY OF CU(II) AND BI(III) COMPLEXES BASED ON AMINOPOLYCARBOXYLATE IONS AND 2-FORMYL AND 2-ACETYLPYRIDINE THIO- SEMICARBAZONES
(2021) Neguța, Elena; Balan, Greta; Gulea, Aurelian; Bulimestru, Ion
The biological properties of thiosemicarbazones are often related to metal coordination, which as result affects lipophilicity that controls the rate of entry into the cell. Metal complexes are generally more active than the free ligand, or the metal complex can be a vehicle for activation of the ligand as the cytotoxic agent. Among biologically ac- tive metal compounds, copper (II) complexes with 2-formyl and 2-acetylpyridine thio- semicarbazones proved to be among the most potent antiviral, antitumor and anti-inflam- matory agents. Bismuth compounds have been widely used in medicine for more than two centuries due to their high effectiveness and low toxicity. In the antimicrobial realm, ap- plications have been widespread, due to bismuth antiseptic, astringent, protective, ant- acid, antisecretory and local gastrointestinal properties.
NOVEL 2-FORMYLPYRIDINE 4-ALLYL-S- METHYLISOTHIOSEMICARBAZONE AND ZN(II), CU(II), NI(II) AND CO(III) COMPLEXES: SYNTHESIS, CHARACTERIZATION, CRYSTAL STRUCTURE, ANTIOXIDANT, ANTIMICROBIAL AND ANTIPROLIFERATIVE ACTIVITY
(2019) Balan, Greta; Usataia, Irina; Graur, Vasilii; Ciumacov, Iurie; Petrenko, Peter; Gudumac, Valentin; Gulea, Aurelian; Pahonțu, Elena; Burduniuc, Olga
New zinc (II), copper (II), nickel (II) and cobalt (III) complexes, [Zn (HL)2]I2 (1), [Cu (HL)Cl2] (2), [Cu (HL)Br2] (3), [Cu (HL)(H2O)2](ClO4)2 (4), [Ni (HL)2]I2·H2O (5), [Co(L)2]Cl (6), [Co(L)2]NO3 (7), [Co(L)2]I·[Co(L)2](I3) (8) were obtained with 2-formylpyridine 4-allyl-S-methylisothiosemicarbazone (HL). The isothiosemicarbazone ligand was characterized by NMR (1H and 13C), IR spectroscopy and X-ray diffraction. All the complexes were characterized by elemental analysis, IR, UV–Vis, ESI-MS spectroscopy, molar conductivity, magnetic susceptibility measurements. X-ray diffraction analysis on the monocrystal and powder elucidated the structure of the complexes 1, 5, 7 and 8. The ligand and the complexes were tested for their antioxidant and antimicrobial activity against Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae and Candida albicans. Also, the antiproliferative properties of these compounds on human leukemia HL-60, human cervical epithelial HeLa, human epithelial pancreatic adenocarcinoma BxPC-3, human muscle rhabdomyosarcoma spindle, large multinucleated RD cells and normal MDCK cells have been investigated. The nickel complex 5 and cobalt complexes 6, 7 showed promising antiproliferative activity and low toxicity.
NOVEL 2-FORMYLPYRIDINE 4-ALLYL-S-METHYLISOTHIOSEMICARBAZONE AND ZN(II), CU(II), NI(II) AND CO(III) COMPLEXES: SYNTHESIS, CHARACTERIZATION, CRYSTAL STRUCTURE, ANTIOXIDANT, ANTIMICROBIAL AND ANTIPROLIFERATIVE ACTIVITY
(John Wiley & Sons Ltd, 2020) Balan, Greta; Burduniuc, Olga; Usataia, Irina; Graur, Vasilii; Chumakov, Yurii; Petrenko, Peter; Gudumac, Valentin; Gulea, Aurelian; Pahontu, Elena
New zinc (II), copper (II), nickel (II) and cobalt (III) complexes, [Zn (HL) 2 ]I 2 (1), [Cu (HL)Cl 2 ](2), [Cu (HL)Br 2 ](3), [Cu (HL)(H 2 O) 2 ](ClO 4 ) 2 (4), [Ni (HL) 2 ]I 2 H 2 O(5), [Co(L) 2 ]Cl (6), [Co(L) 2 ]NO 3 (7), [Co(L) 2 ]I[Co(L) 2 ](I 3 ) (8) were obtained with 2-formylpyridine 4-allyl-S-methylisothiosemicarbazone (HL). The isothiosemicarbazone ligand was characterized by NMR ( 1 H and 13 C), IR spectroscopy and X-ray diffraction. All the complexes were character- ized by elemental analysis, IR, UV–Vis, ESI-MS spectroscopy, molar conductiv- ity, magnetic susceptibility measurements. X-ray diffraction analysis on the monocrystal and powder elucidated the structure of the complexes 1,5, 7and 8. The ligand and the complexes were tested for their antioxidant and antimi- crobial activity against Staphylococcus aureus,Escherichia coli,Klebsiella pneumoniae and Candida albicans. Also, the antiproliferative properties of these compounds on human leukemia HL-60, human cervical epithelial HeLa, human epithelial pancreatic adenocarcinoma BxPC-3, human muscle rhabdomyosarcoma spindle, large multinucleated RD cells and normal MDCK cells have been investigated. The nickel complex 5and cobalt complexes 6,7showed promising antiproliferative activity and low toxicity
NOVEL COPPER(II) COMPLEXES WITH N4,S-DIALLYLISOTHIOSEMICARBAZONES AS POTENTIAL ANTIBACTERIAL/ANTICANCER DRUGS
(2023) Graur, Vasilii; Usataia, Irina; Graur, Ianina; Garbuz, Olga; Bouroș, Paulina; Cravțov, Victor; Lozan-Tîrșu, Carolina; Balan, Greta; Fala, Valeriu; Gulea, Aurelian
The six new copper(II) coordination compounds [Cu(HL1)Cl2] (1), [Cu(HL1)Br2] (2), [Cu(H2O)(L1)(CH3COO)]·1.75H2O (3), [Cu(HL2)Cl2] (4), [Cu(HL2)Br2] (5), [Cu(H2O)(L2)(CH3COO)] (6) were synthesized with 2-formyl- and 2-acetylpyridine N4,S-diallylisothiosemicarbazones (HL1 and HL2). The new isothiosemicarbazones were characterized by NMR, FTIR spectroscopy, and X-ray crystallography ([H2L2]I). All copper(II) coordination compounds were characterized by elemental analysis, FTIR spectroscopy, and molar conductivity of their 1mM methanol solutions. Furthermore, the crystal structure of complex 3 was determined using single-crystal X-ray diffraction analysis. The studied complexes manifest antibacterial and antifungal activities, that in many cases are close to the activity of medical drugs used in this area, and in some cases even exceed them. The complexes 4 and 5 showed the highest indexes of selectivity (280 and 154) and high antiproliferative activity against BxPC-3 cell lines that surpass the activity of Doxorubicin. The complexes 1–3 also manifest antioxidant activities against cation radicals ABTS•+ that are close to that of trolox, the antioxidant agent used in medicine.
POLIZAHARIDELE CIANOBACTERIENE – AGENȚI POTENȚIALI CU ACȚIUNE ANTIBACTERIANĂ
(CEP USM, 2022-11-10) Trofim, Alina; Zosim, Liliana; Bulimaga, Valentina; Balan, Greta; Rudic, Valeriu; Elenciuc, Daniela
SINTEZA COMBINAȚIILOR COORDINATIVE CU UNELE METALE 3D ÎN BAZA N(4)-(4-BENZOAT DE ETIL) TIOSEMICARBAZONE ALE DERIVAȚILOR ALDEHIDEI SALICILICE. PROPRIETĂȚI ANTIMICROBIENE, ANTIFUNGICE ȘI ANTIOXIDATIVE
(CEP USM, 2021) Rusnac, Anna; Țurcanu, Nina; Burduniuc, Olga; Balan, Greta; Garbuz, Olga; Gulea, Aurelian
În lucrare este descrisă sinteza a 4 substanțe organice noi N(4)-(4-benzoat de etil) tiosemicarbazone ale derivaților aldehidei salicilice și a 29 combinații coordinative ale Cu(II), Ni(II), Zn(II) și Co(III). Structurile substanțelor sintetizate au fost confirmate cu ajutorul spectroscopiei IR și RMN, analizei elementale, magnetochimiei și, în cazul [Ni(L2) DMF]·DMF, difracției cu raze X. Studiul activității antimicrobiene s-a dovedit a fi în limita concentrației 0,125-0,500 mg/mL, iar activitate antifungică a înregistrat cel mai bun rezultat pe Cryptococcus neoformans la complexul {Ni(HL1)Cl}•C2H5OH•3H2O, unde CMI=0,016 mg/mL, fiind mai activ decât substanța martor Nistatina. Cele mai bune rezultate ale testului ABTS au fost înregistrate la ligandul H2L3(7) și la complexul {Ni(HL3) NO3}•H2O (7.8), care la concentrația 100 µM inhibă 54,4% din radicali ABTS•+.
SINTEZA ȘI PROPRIETĂȚILE ANTIBACTERIENE ȘI ANTIFUNGICE AL E COMPUȘILOR COORDINATIVI AI Fe (III) CU 4 - CICLOHEXILTIOSEMICARBAZONA 4 - BENZOIL - 3 - METIL - 1 - FENIL - 2 - PIRAZOLIN - 5 - ONĂ
(CEP USM, 2020) Rusnac, Roman; Bîrca, Maria; Cotovaia, Aliona; Balan, Greta; Burduniuc, Olga; Gulea, Aurelian; Șova, Sergiu
În lucrare este relatată metoda de sinteză a trei combinații coordinative noi ale Fe (III) cu ciclohexiltiosemicarbazona 4 - benzoil - 3 - metil - 1 - fen il - 2 - pirazolin - 5 - onă. Activitatea antimicrobiană a compușilor studiați este moderată. Compusul coordi nativ [Fe(HL) 2 ]NO 3 ·H 2 O a demonstrat cea mai bună activitate față de tulpina de fungi Cryptococcus neoformans. Prin urmare, activitatea acestui compus este de 36 de ori mai bună comparativ cu nistatina; de 18 și 2 ori mai bună decât miconasolul și , respectiv , fluconazolul, preparte utilizate actualmente în profilaxia și tratamentul infecțiilor cauzate de aceste microorganisme .
SUBSTANȚE BIOACTIVE CU ACTIVITATE ANTIBACTERIANĂ ANTIVIRALĂ ȘI ANTIFUNGICĂ OBȚINUTE DIN CIANOBACTERII
(CEP USM, 2024) Bulimaga, Valentina; Zosim, Liliana; Trofim, Alina; Elenciuc, Daniela; Rudic, Valeriu; Balan, Greta
Cianobacteriile și microalgele sunt cunoscute ca potențiali producători de noi substanțe naturale fiind surse valoroase de substanțe bioactive (inclusiv metaboliți) și prezintă un interes din ce în ce mai mare pentru cercetători grație efectelor lor benefice asupra sănătății. Exploatarea tulpinilor de cianobacterii bogate în noi substanțe bioactive valoroase din punct de vedere farmacologic, inclusiv substanțe antimicrobiene (antibacteriene, antifungice și antivirale) este foarte actuală datorită apariției și răspândirii rezistenței agenților patogeni la antibioticele utilizate. Unele studii au raportat rezultate promițătoare privind cianobacteriile ca surse bogate de compuși bioactivi cu activități antibacteriene, antivirale, antifungice, algicide și citotoxice, care deschid perspectiva aplicării lor în scopuri terapeutice. În studiul dat sunt prezintate diverse caracteristici ale cianobacteriilor, inclusiv capacitatea lor de a produce compuși cu activități biologice, inclusiv antimicrobiene, antivirale și antifungice, ceea ce le face candidați potriviți pentru exploatarea lor ca surse naturale de agenți bioactivi.
Synthesis and biological activity of n-(4-methoxyphenyl)-2-oxopropanamide 4-phenylthiosemicarbazone and its copper(II) complexes
(CEP USM, 2024) Graur, Ianina; Usataia, Irina; Graur, Vasilii; Tsapkov, Victor; Gulea, Aurelian; Garbuz, Olga; Balan, Greta
The new N-(4-methoxyphenyl)-2-oxopropanamide 4-phenylthiosemicarbazone (HL) and its 5 copper(II) coordination compounds [Cu(L)X] (X = Cl- (I); Br- (II); NO3- (III); CH3COO- (IV); Cl2CHCOO- (V)) have been synthesized and characterized by elemental analysis, FTIR and NMR spectra. Coordination of 4-phenylthiosemicarbazone HL with the copper(II) atom led to increased antibacterial activity against Staphylococcus aureus and Bacillus cereus. Non-coordinated 4-phenylthiosemicarbazone (HL) showed the highest activity in relation to ABTS•+ cation radicals; its activity is close to that of Trolox, which is used in medicine. The antibacterial and antioxidant activities of the synthesized complexes are influenced by the nature of the acidic residue in their composition.
SYNTHESIS, STRUCTURE AND BIOLOGICAL ACTIVITY OF COORDINATION COMPOUNDS OF COPPER, NICKEL, COBALT, AND IRON WITH ETHYL N'-(2-HYDROXYBENZYLIDENE)-N-PROP-2-EN- 1-YLCARBAMOHYDRAZONOTHIOATE
(2020) Gulea, Aurelian; Usataia, Irina; Graur, Vasilii; Ciumacov, Iurie; Petrenko, Peter; Balan, Greta; Burduniuc, Olga; Țapcov, Victor; Rudic, Valeriu
N-(Prop-2-en-1-yl)hydrazonocarbothioamide reacts with iodoethane in methanol with further addition of 2-hydroxybenzaldehyde to form hydroiodide of carbamohydrazonothioate (HL·HI). The coordination compounds were obtained by interaction of HL or HL·HI with copper, nickel, cobalt and iron salts CuLХ·nH2O [X = Cl–, Br–, NO3–; n = 0–1], Ni(L)2·HI·CH3OH, Сo(L)2X [X = I–, NO3–] and Fe(L)2NO3. The structures of three complexes were established by single crystal X-ray analysis. The synthesized complexes exhibit selective antimicrobial and antifungal activity against a series of standard microorganisms and fungi in the concentration range of 30–500 μg/mL. In addition, nickel and iron complexes selectively inhibit the growth and proliferation of cancer cells and do not adversely affect normal cells.
SYNTHESIS, STRUCTURE, AND BIOLOGICAL ACTIVITY OF COORDINATION COMPOUNDS OF COBALT(II), NICKEL(II), AND COPPER(II) WITH N-(METHOXYPHENYL)-2-[(5-NITROFURYL)METHYLENE]HYDRAZINE CARBOTHIOAMIDES
(2019) Gulea, Aurelian; Mitchevici, N.; Ciumacov, Iurie; Petrenko, Peter; Balan, Greta; Burduniuc, Olga; Țapcov, Victor
4-(2-Methoxyphenyl)-, 4-(3-methoxyphenyl)-, and 4-(4-memoxyphenyl)-2-[(5-mttofuryl)methylene]-hydrazine carboxamide (HL1–3) react with hydrates of cobalt (nickel, copper) chloride (nitrate, acetate) with the formation of the M(HL1–3)2X2 (M = Co2+, Ni2+, Cu2+; X = Cl−, NO3−) and M(L1–3)2 (M = Ni2+, Cu2+) coordination compounds. Structure of the obtained compounds has been studied by means of X-ray diffraction analysis. Their antimicrobial and antifungal activity towards a series of Staphylococcus aureus, Escherichia coli, and yeast-like fungi standard strains has been investigated.
SYNTHESIS, STRUCTURE, AND BIOLOGICAL ACTIVITY OF COPPER AND COBALT COORDINATION COMPOUNDS WITH SUBSTITUTED 2-(2-HYDROXYBENZYLIDENE)-N-(PROP-2-EN-1-YL)HYDRAZINE- CARBOTHIOAMIDES
(2019) Gulea, Aurelian; Graur, Vasilii; Ciumacov, Iurie; Petrenko, Peter A.; Balan, Greta; Burduniuc, Olga; Țapcov, Victor; Rudic, Valeriu
The reaction of N-(prop-2-en-1-yl)hydrazinecarbothioamide with substituted 2-hydroxybenzaldehydes afforded the corresponding Schiff bases which were used as ligands to obtain copper and cobalt coordination compounds Cu(NL1–6)X · n H2O (X = Cl−, NO3−; n = 0–3), Co(HL2)2NO3, and Co(NL6)2Cl. The structure of the isolated complexes was determined by NMR spectroscopy and X-ray analysis. The complexes were tested for antimicrobial and antifungal activity against S. aureus, E. coli, and yeast-like fungi. Inhibitory effect of the initial thioamides and their complexes against human myeloid leukemia HL-60 cancer cell line was also studied.
SYNTHESIS, STRUCTURE, AND BIOLOGICAL ACTIVITY OF COPPER(II), NICKEL(II), COBALT(III), AND IRON(III) COORDINATION COMPOUNDS WITH 2-{2-[(PROP-2-EN-1-YL)CARBAMOTHIOYL]HYDRAZINYLIDENE}PROPANOIC ACID
(2020) Gulea, Aurelian; Graur, Vasilii; Diurici, E.; Ulchina, Ianina; Bouroș, Pavlina; Balan, Greta; Burduniuc, Olga; Țapcov, Victor; Rudic, Valeriu
2-Oxopropanoic acid reacts in ethanol with N-(prop-2-en-1-yl)hydrazinecarbothioamide in a 1 : 1 mole ratio to form thiosemicarbazone H2L. Coordination compounds Cu(HL)X [X = Cl–, Br–, NO3–], Cu(H2O)(L), Ni(HL)2, Co(HL)2X [X = Cl–, Br–], and Fe(HL)2X [X = NO3–, Br–] are formed in the reactions of H2L with copper(II), nickel(II), cobalt(II), and iron(III) salts. The reactions of Cu(H2O)(L) with imidazole (Im) and 3,4-dimethylpyridine (3,4-Lut) result in mixed-ligand complexes Cu(A)(L) [A = Im, 3,4-Lut]. The structures of two copper complexes were determined by single crystal X-ray diffraction analysis. The synthesized complexes exhibit selective antimicrobial and antifungal activity in the concentration range of 15.62–1000 μg/mL. The introduction of amines into the inner sphere of copper complexes leads to an increase in the antimicrobial activity.