37 research outputs found

    Termičko ponašanje i biološka aktivnost [co2(cl)2 tpmc](bf4)2 kompleksa

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    A large number of interesting Co (II) complexes with macrocyclicligands have been synthesized and the recognition of its complexes as important bioactive compounds in vitro and in vivo has aroused growing interest in these agents as potential drugs for therapeutic use in various diseases. Numerous available information on their bioinorganic properties and mode of action in several biological systems, combined with the new possibilities imposed by the development of medical chemistry, opens space for the development of a new generation of highly active drugs with minimized side effects which could add significantly to the current clinical research and practice. In this paper we attempt to present some properties of the earlier isolated the first Co(II)tpmc complex for which crystal structure confirmed chair conformation of macrocycle. Complex with formula [Co2(Cl)2tpmc](BF4)2 (tpmc = N,N',N'',N'''-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane), was studied on thermal behaviour and biological activity. TG-DTA analysis indicates that complex decomposition in a single step in the range of 365-435 °C. Investigated cytotoxic activity against two human cancer cell lines: HeLa (human cervix adenocarcinoma) and K562 (human myelogenous leukaemia). Complex was also preliminary assayed in vitro toward bacteria, fungi and mould together with the starting material for the synthesis (ligands, simple salts and solvents) as test substances. Investigated complex showed a moderate activity against strains of bacteria and were inactive against the tested fungi and mould. Minimal inhibitory concentration suppressing the visible growth of bacteria was determined. Biological investigations show the complex has significant cytotoxic potential.Poznavanje biološke uloge kobalta i prepoznavanje njegovih kompleksa kao važnih bioaktivnih jedinjenja razlozi su sve veće zainteresovanosti za potencijalnu terapijsku primenu ovih kompleksa kod različitih bolesti. Brojne dostupne informacije o njihovim osobinama i načinu delovanja u nekoliko bioloških sistema, u kombinaciji sa novim mogućnostima koje nameće razvoj medicinske hemije, otvaraju prostor za razvoj nove generacije visoko aktivnih lekova sa minimalnim nuspojavama. U ovom radu smo ispitali neke osobine ranije izolovanog Co (II) tpmc kompleksa, prvog kod koga je rendgenska strukturna analiza potvrdila da se makrciklični ligand nalazi u konformaciji stolice. Ispitivane su termogravimetrijske I biološke osobine kompleksa [Co2(Cl)2tpmc](BF4)2 (tpmc = N, N', N'', N'''-tetrakis (2-piridilmetil) -1,4,8,11-tetraazaciklotetradekan). TG-DTA analiza ukazuje da je razlaganje kompleksa u jednom koraku u rasponu temperature od 365 -435 ° C. Ispitivana je citotoksična aktivnost na dve ljudske ćelijske linije karcinoma: HeLa (adenokarcinom grlića maternice) i K562 (mijelogena leukemija). Antimikrobno djelovanje kompleksa kvantifikovano je određivanjem minimalne inhibitorne koncentracije (MIC) korišćenjem bakterija Staphylococcus saprophyticus, Staphylococcus xylosus, Bacillus cereus, soja kvasca Candida albicans i plesni Aspergillus niger. Biološka ispitivanja su pokazala da kompleks ima značajan citotoksični potencijal I umerenu aktivnost prema bakterijama soja Staphylococcus

    Uporedni prikaz antimikrobne aktivnosti srodnih Co(II)/Cu(II) kompleksa

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    The aim of this paper is to compare the efficiency of some analogue of Co (II) and Cu (II) complexes to bacteria pathogenic to humans, which can contaminate vegetables and fruit at any stage of its production. The complexes of Cu(II) and Co(II) with N, N’, N’’, N’’’ - tetrakis (2-pyridylmethyl) -1,4,8,11-tetraazacyclotetradecane (tpmc) and various additional ligands were tested against Gram (+) and Gram (-) bacteria and some strains of fungi. As a control group the free salts of Co(II) and Cu(II) which were used as starting substances in the synthesis, as well as ligands and solvents were tested. The minimum inhibition concentrations suppressing the visible growth of bacteria (MIC) were also screened. Investigated complexes showed a moderate activity against strains of bacteria. Complexes of Co(II) generally showed higher activity then Cu(II) analogues. Under the same conditions and the same concentrations, the control group showed no activity. No compound showed antifungal activity.Cilj ovog rada je poređenje efikasnosti nekih analognih kompleksa Co(II) i Cu(II) na bakterijske vrste patogene za čoveka koje mogu kontaminirati povrće i voće u bilo kojoj fazi njegove proizvodnje. Kompleksi Cu (II) i Co (II) sa N, N’, N’’, N’’’ - tetrakis (2-piridilmetil) -1,4,8,11-tetraazaciklotetradekanom (tpmc) i različitim dodatnim ligandima su testirani na Gram (+) i Gram (-) bakterije i neke sojeve gljiva. Kao kontrolna grupa su testirane i proste soli Co(II) i Cu(II) koje su korišćene kao polazne supstance u sintezi kao i ligandi i rastvarači. Određene su minimalne inhibitorne koncentracije (MIC) koje sprečavaju rast mikroorganizama. Ispitivani kompleksi pokazuju umerenu aktivnost prema sojevima bakterija. Kompleksi Co(II) su pokazali generalno već u aktivnost u odnosu na Cu (II) analoge. Pod istim uslovima i u primenjenim istim koncentracijama kontrolne grupe nisu pokazale aktivnost. Nijedno jedinjenje nije ispoljilo antigljivično dejstvo

    Varijabilnost svojstava introdukovanih genotipova kvinoje (Chenopodium quinoa Willd.)

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    We analyzed variability and influence of investigated factors on grain yield of quinoa during three year period (2009, 2010, 2011). The experiment was conducted at two locations (Nova Pazova and Surduk), using two introduced genotypes of quinoa: KVL 37 and KVL 52. We detected that location and genotype had important impact. Grain yield varied according to years of study (1224 kg/ha to 1671 kg/ha). Results of regression and correlation analysis indicate on variation of the impact of plant height and number of plants per meter on the grain yield. Correlation coefficients were generally low and didn't show as significant. This indicates that these studies included small number of properties that can affect grain yield. In further work with this introduced species, more properties should be included.Analizirana je varijabilnost i uticaj ispitivanih faktora na prinos zrna kvinoje tokom tri godine (2009, 2010, 2011). Ogled je izveden na dve lokacije (Nova Pazova i Surduk) sa dva introdukovana genotipa kvinoje: KVL 37 i KVL 52. Setva je obavljena u aprilu, a žetva u avgustu. Analizirani su: visina biljaka (cm), broj biljaka po dužnom metru i prinos zrna. Konstatovan je značajan uticaj lokacije i genotipa. Prinos zrna varirao je po godinama ispitivanja (1.224 kg/ha do 1.671 kg/ha). Rezultati regresione i koralacione analize ukazuju na variranje uticaja visine biljaka i broja biljaka po dužnom metru na prinos zrna. Koeficijenti korelacija su uglavnom bili niski i nisu ispoljili značajnost. Ovo ukazuje da je u daljim istraživanjima poželjno povećati broj svojstava, koja bi mogla uticati na visinu prinosa

    Novi mešovito-ligandni kompleksi Co (II)- sinteza, karakterizacija i antimikrobna aktivnost

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    A new complexes with general formula [Co2(X)2tpmc](BF4)2·Y (X= F-, Y=CH3CN; X= Br-, Y= H2O; tpmc = N,N',N'',N'''-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane), were isolated and their composition, some of physical and chemical properties and their tentative geometries were evaluated based on: elemental analysis (C, H, N), conductometric and magnetic measurements, spectroscopic data (UV/Vis, IR) respectively. Then, we compared synthesized complexes with early described chloro analogous. Both complexes are binuclear with proposed chair conformation of macrocycle. Complex compounds were also preliminary assayed in vitro toward some Gram (+) and Gram (-) bacteria, fungi and mould together with the starting material for the synthesis (ligands, simple salts and solvents) as test substances. In some cases certain antimicrobial activity of the complexes was detected. Minimal inhibitory concentration suppressing the visible growth of bacteria was determined. Both investigated complexes showed a moderate activity against strains of bacteria and were inactive against the tested fungi and mould. Under the same conditions and applied the same concentration of the control group did not show activity.Pripremlljena su dva nova kompleksa opšte formule [Co2(X)2tpmc](BF4)2·Y (X= F-, Y=CH3CN; X= Br-, Y= H2O; tpmc = N,N',N'',N'''-tetrakis(2-piridilmetil)-1,4,8,11- tetraazaciklotetradekan), čiji su sastav, neke fizičke i hemijske osobine kao i približne geometrije određene na osnovu elementalne analize (C, H, N), konduktometrijskih i magnetnih merenja i spektroskopskih podataka (UV/Vis, IR). Podaci su upoređeni sa ranije sintetisanim i opisanim hloro analogom. Oba nova kompleksa Co(II) su dinuklearna sa pretpostavljenom egzo koordinacijom makrocikla u konformaciji stolice. Kompleksi su preliminarno testirani na neke Gram (+), Gram (-) bakterije, plesni i kvasce zajedno sa startnim supstancama za sintezu (ligandima, prostim solima i rastvaračima) koje su služile kao test supstance. Određivana je minimalna inhibitorna koncentracija koja sprečava rast bakterija. U nekim slučajevima je nađena izvesna antimikrobna aktivnost. Oba kompleksa su pokazala aktivnost prema bakterijama ali su inaktivni prema gljivicama i kvascima dok je pod istim uslovima i istim primenjenim koncentracijama kontrolna grupa bila neaktivna

    Acid–base equilibria of the Zn(II) and Fe(III) complexes with condensation products of 2-acetylpyridine and the dihydrazide of oxalic and malonic acid

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    Acid–base equilibria of Zn(II) and Fe(III) complexes with N',N'2-bis[(1E)-1-(2-pyridyl)ethylidene]ethanedihydrazide (ligand L1) and N',N'2-bis[(1E)-1-(2-pyridyl)ethylidene]propanedihydrazide (ligand L2), i.e., [Fe(L1)Cl2(H2O)], [Fe(L2)Cl(H2O)]2+, [Zn(L1)(H2O)3]+ and [Zn(L2)(H2O)2]2+, which expressed cytotoxic activity, were investigated in aqueous media. The equilibrium constants were determined potentiometrically at 25 °C at a constant ionic strength of 0.10 mol/dm3 (Na2SO4). The results showed that at pH < 8 both the Fe(III) complexes studied here have three, while [Zn(L1)(H2O)3]+ and [Zn(L2)(H2O)2]2+ have one and two titratable protons, respectively. Based on the obtained values for the equilibrium constants, protonation schemes of the examined complexes are proposed

    Uticaj suše na prinos zrna kvinoje (Chenopodium quinoa Willd.)

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    Korišćenje alternativnih žita u ishrani zahteva uvođenje novih biljnih vrsta u proizvodnju kao što su kvinoja, amarantus i druge. Kvinoja (Chenopodium quinoa Wild.) se gaji radi zrna, koje je po nutritivnoj vrednosti slično zrnu žita, ali ne sadrži protein gluten. Tokom 2010, 2011. i 2012. godine izvođeni su ogledi sa introdukovanom vrstom kvinoja (Chenopodium quinoa Willd.). Ogledi su izvedeni u Novoj Pazovi na zemljištu tipa karbonatni černozem sa dva genotipa (KVL 37 i KVL 52). Setva je obavljena u aprilu i žetva u avgustu. Prosečne temperature vazduha u periodu vegetacije (april-septembar) su rasle od prve prema trećoj godini izvođenja ogleda, a količine padavina su značajno opadale. U 2010. ostvaren je prosečan prinos od 1360 kg/ha, a u 2011. godini 1467 kg/ha. U 2012. godini nastupile su veoma visoke temeperature (31-38,4oC) u trajanju od 70 dana i suša u periodu juni-septembar. Ovo je uticalo na veoma značajno smanjenje prinosa zrna, koji je u proseku iznosio 382 kg/ha. Sorta KVL 52 je bila prinosnija u odnosu na KVL 37

    Nови мешовитолигандни макроциклични комплекси Ni(II) и Zn(II) са мостовним (endo,endo)-бицикло-[2.2.1]-хепт-5-ен-2,3-дикарбоксилатом: синтеза, карактеризација, антимикробна и цитотоксична активност

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    New carboxylate complexes of the tetraazamacrocyclic ligand N,N',N'',N'''-tetrakis(2-pyridilmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) with Ni(II) and Zn(II) as central ions were prepared. In mixed-ligand com- plexes (endo,endo)-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate dianion (C9H8O42- ) is also coordinated to metal ions. The complexes were characterized by ele- mental analysis (C, H, N), FTIR and UV–Vis spectroscopy, molar conductivity determination and magnetic susceptibility measurement at room temperature. The analytical data of the complexes show the formation of binuclear [Ni2(C9H8O4)tpmc](ClO4)2·4H2O and tetranuclear [Zn4(C9H8O4)(tpmc)2](ClO4)6· ·CH3CN·KClO 4·4H2O complexes. In tetranuclear Zn(II) complex bicyclic dicarboxylate ligand is most likely to be bridge coordinated, and in binuclear Ni(II) complex it is coordinated in a combined bridged manner with chelate rings formation. In both complexes macrocyclic ligand was exo coordinated, out of cyclam ring and adopts a boat conformation. The Zn(II) complex is one of the rare tetranuclear Zn(II)-tpmc complexes with carboxylate ion bridging two Zn2tpmc units. The complexes were tested for antibacterial activity against Gram-positive bacteria Staphylococcus aureus (ATCC 25923) and Bacillus subtilis (ATCC 6633), Gram-negative bacterium Escherichia coli (ATCC 25922), and yeast Candida albicans (ATCC 10231), and were screened for antiproliferative activity against human cervix adenocarcinoma (HeLa) and human myelogenous leukemia (K562) cell lines.Синтетисани су нови карбоксилато комплекси са тетраазамакроцикличним ли- гандом N,N',N'',N'''-тетракис(2-пиридилметил)-1,4,8,11-тетраазациклотетрадеканом (tpmc) и Ni(II) и Zn(II) као централним јонима. У мешовитолигандним комплексима (endo,endo)-бицикло-[2.2.1]-хепт-5-ен-2,3-дикарбоксилато дианјон (C9H8O4 2- ) је такође везан за метални јон. Комплекси су окарактерисани елементалном анализом (C, H, N), FTIR и UV/Vis спектроскопијом, као и мерењем моларне проводљивости и магнетне сусцептибилности на собној температури. На основу добијених резултата претпос- тављена је бинуклеарна структура [Ni2(C9H8O4)tpmc](ClO4) 2·4H2O комплекса, односно, тетрануклеарна [Zn4(C9H8O4 )(tpmc) 2](ClO4)6·CH3CN·KClO4 ·4H2O комплекса. У тетра- нуклеарном Zn(II) комплексу, бициклични дикарбоксилато лиганд је највероватније мостно везан, док је у бинуклеарном Ni(II) комплексу мешовити мостно-хелатни начин координације. Други начини мостног везивања дикарбоксилата не могу бити у потпуности искључени. У оба комплекса макроциклични лиганд је егзо координован, изван цикламовог прстена и заузима конформацију лађе. Добијени Zn(II) кoмплекс је један од ретких тетрануклеарних Zn(II)–tpmc комплекса са карбоксилато лигандом у мосту између две Zn2tpmc јединице. Добијени комплекси су тестирани на антибактеријску активност према Грам-позитивним бактеријама Staphylococcus aureus (ATCC 25923) и Bacillus subtilis (ATCC 6633), Грам-негативној бактерији Escherichia coli (ATCC 25922) и квасцу Candida albicans (ATCC 10231). Испитивана је њихова антипролиферативна активност на хуманим малигним ћелијским линијама: цервикалног аденокарцинома (HeLa) и мијелогене леукемије (K562)
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