TY  - JOUR
AU  - Zuman, P.
AU  - Rozbroj, D.
AU  - Ludvik, J.
AU  - Aleksić, Mara
AU  - Camaione, L.
AU  - Celik, H.
PY  - 2003
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5464
AB  - Abstract
Ratios of limiting diffusion controlled currents recorded in aqueous solutions to those obtained in mixture with water-soluble organic co-solvents yield values of ηrel1/2. These values can be used for evaluation of electrochemical experiments in such media and for distinguishing currents affected solely by a change in viscosity from those caused by other solvent-solute interactions, e.g. covalent additions. Limiting currents of Cd2+ ions and of 2-hydroxy-1,4-naphthoquinone proved to yield most reliable results, values of ηrel1/2 obtained with Tl+ ions showed somewhat poorer correlation. The average values of ηrel1/2 obtained from comparison of limiting currents for mixtures of water with ethanol and acetonitrile are in very good agreement with average values of ηrel1/2 reported in the literature and in acceptable agreement for mixtures of water with 2-propanol. Nevertheless, the electrochemical data show much smaller standard deviations, than the data reported in the literature, which have shown inconsistencies when data from different sources are compared and can be considered as more reliable. The data obtained for mixtures of water with DMF have not been previously reported. © 2003 Elsevier Science B.V. All rights reserved.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - The use of limiting currents in determination of the effect of viscosity in electrochemical experiments performed in mixtures of water with some organic co-solvents
VL  - 553
SP  - 135
EP  - 138
DO  - 10.1016/S0022-0728(03)00306-1
ER  - 

@article{
author = "Zuman, P. and Rozbroj, D. and Ludvik, J. and Aleksić, Mara and Camaione, L. and Celik, H.",
year = "2003",
abstract = "Abstract
Ratios of limiting diffusion controlled currents recorded in aqueous solutions to those obtained in mixture with water-soluble organic co-solvents yield values of ηrel1/2. These values can be used for evaluation of electrochemical experiments in such media and for distinguishing currents affected solely by a change in viscosity from those caused by other solvent-solute interactions, e.g. covalent additions. Limiting currents of Cd2+ ions and of 2-hydroxy-1,4-naphthoquinone proved to yield most reliable results, values of ηrel1/2 obtained with Tl+ ions showed somewhat poorer correlation. The average values of ηrel1/2 obtained from comparison of limiting currents for mixtures of water with ethanol and acetonitrile are in very good agreement with average values of ηrel1/2 reported in the literature and in acceptable agreement for mixtures of water with 2-propanol. Nevertheless, the electrochemical data show much smaller standard deviations, than the data reported in the literature, which have shown inconsistencies when data from different sources are compared and can be considered as more reliable. The data obtained for mixtures of water with DMF have not been previously reported. © 2003 Elsevier Science B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "The use of limiting currents in determination of the effect of viscosity in electrochemical experiments performed in mixtures of water with some organic co-solvents",
volume = "553",
pages = "135-138",
doi = "10.1016/S0022-0728(03)00306-1"
}

Zuman, P., Rozbroj, D., Ludvik, J., Aleksić, M., Camaione, L.,& Celik, H.. (2003). The use of limiting currents in determination of the effect of viscosity in electrochemical experiments performed in mixtures of water with some organic co-solvents. in Journal of Electroanalytical Chemistry
Elsevier., 553, 135-138.
https://doi.org/10.1016/S0022-0728(03)00306-1

Zuman P, Rozbroj D, Ludvik J, Aleksić M, Camaione L, Celik H. The use of limiting currents in determination of the effect of viscosity in electrochemical experiments performed in mixtures of water with some organic co-solvents. in Journal of Electroanalytical Chemistry. 2003;553:135-138.
doi:10.1016/S0022-0728(03)00306-1 .

Zuman, P., Rozbroj, D., Ludvik, J., Aleksić, Mara, Camaione, L., Celik, H., "The use of limiting currents in determination of the effect of viscosity in electrochemical experiments performed in mixtures of water with some organic co-solvents" in Journal of Electroanalytical Chemistry, 553 (2003):135-138,
https://doi.org/10.1016/S0022-0728(03)00306-1 . .

TY  - CONF
AU  - Kapetanović, Vera
AU  - Aleksić, Mara
AU  - Zuman, P.
PY  - 2002
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/389
AB  - All aspects of electrochemically studies of cephalosporins are presented: the reduction and oxidation processes, adsorption phenomenon, catalytic processes, complex formation, degradation, analytical determination stripping analysis, applications of different methods proposed in biological materials and drugs. In addition, the recent developments in electrochemistry of cefetamet, the cephalosporin with metoxyimino group in the side chain of C-7 are given.
AB  - U radu su prikazani svi aspekti elektrohemijskog proučavanja cefalosporinskih antibiotika: polarografska i voltametrijska ispitivanja procesa redukcije i oksidacije, fenomen adsorpcije na živinoj elektrodi, "stripping" analiza kataliti č ki talasi, formiranje kompleksa, indirektnog i direktnog određivanja u doziranim farmaceutskim oblicima i u biološkom materijalu. U drugom delu rada, prikazani su noviji rezultati dobijeni u proučavanju mehanizma redukcije cefetameta - cefalosporina sa alkoksi grupom u bočnom lancu na položaju C-7.
PB  - Savez farmaceutskih udruženja Srbije, Beograd
C3  - Arhiv za farmaciju
T1  - Electrochemistry of cephalosporins: Recent developments in mechanism study of cefetamet - metoxyimino cephalosporin
T1  - Elektrohemija cefalosporina: noviji rezultati u mehanizmu redukcije metoksiimino cefalosporina-cefetameta
VL  - 52
IS  - 3
SP  - 157
EP  - 166
UR  - https://hdl.handle.net/21.15107/rcub_farfar_389
ER  - 

@conference{
author = "Kapetanović, Vera and Aleksić, Mara and Zuman, P.",
year = "2002",
abstract = "All aspects of electrochemically studies of cephalosporins are presented: the reduction and oxidation processes, adsorption phenomenon, catalytic processes, complex formation, degradation, analytical determination stripping analysis, applications of different methods proposed in biological materials and drugs. In addition, the recent developments in electrochemistry of cefetamet, the cephalosporin with metoxyimino group in the side chain of C-7 are given., U radu su prikazani svi aspekti elektrohemijskog proučavanja cefalosporinskih antibiotika: polarografska i voltametrijska ispitivanja procesa redukcije i oksidacije, fenomen adsorpcije na živinoj elektrodi, "stripping" analiza kataliti č ki talasi, formiranje kompleksa, indirektnog i direktnog određivanja u doziranim farmaceutskim oblicima i u biološkom materijalu. U drugom delu rada, prikazani su noviji rezultati dobijeni u proučavanju mehanizma redukcije cefetameta - cefalosporina sa alkoksi grupom u bočnom lancu na položaju C-7.",
publisher = "Savez farmaceutskih udruženja Srbije, Beograd",
journal = "Arhiv za farmaciju",
title = "Electrochemistry of cephalosporins: Recent developments in mechanism study of cefetamet - metoxyimino cephalosporin, Elektrohemija cefalosporina: noviji rezultati u mehanizmu redukcije metoksiimino cefalosporina-cefetameta",
volume = "52",
number = "3",
pages = "157-166",
url = "https://hdl.handle.net/21.15107/rcub_farfar_389"
}

Kapetanović, V., Aleksić, M.,& Zuman, P.. (2002). Electrochemistry of cephalosporins: Recent developments in mechanism study of cefetamet - metoxyimino cephalosporin. in Arhiv za farmaciju
Savez farmaceutskih udruženja Srbije, Beograd., 52(3), 157-166.
https://hdl.handle.net/21.15107/rcub_farfar_389

Kapetanović V, Aleksić M, Zuman P. Electrochemistry of cephalosporins: Recent developments in mechanism study of cefetamet - metoxyimino cephalosporin. in Arhiv za farmaciju. 2002;52(3):157-166.
https://hdl.handle.net/21.15107/rcub_farfar_389 .

Kapetanović, Vera, Aleksić, Mara, Zuman, P., "Electrochemistry of cephalosporins: Recent developments in mechanism study of cefetamet - metoxyimino cephalosporin" in Arhiv za farmaciju, 52, no. 3 (2002):157-166,
https://hdl.handle.net/21.15107/rcub_farfar_389 .

TY  - JOUR
AU  - Kapetanović, Vera
AU  - Aleksić, Mara
AU  - Zuman, P.
PY  - 2001
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5447
AB  - Abstract
Most oximes as well as their N-alkyl and O-alkyl derivatives are electrochemically reduced in a single four-electron step to the amine. Some exceptions have been reported, where the reduction occurs in two two-electron steps. The reduction of the O-methyloxime grouping in the antibiotic cefetamet occurs at pH 5-9 in two steps, corresponding to a reduction to the imine and amine, respectively. It has been shown that the separation of the two two-electron processes is caused by differences in position and rate of establishment of acid-base equilibria resulting in protonations of the oxime and imino grouping. © 2001 Elsevier Science B.V.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Two-step reduction of the O-methyloxime group in the antibiotic cefetamet
VL  - 507
SP  - 263
EP  - 267
DO  - 10.1016/S0022-0728(01)00507-1
ER  - 

@article{
author = "Kapetanović, Vera and Aleksić, Mara and Zuman, P.",
year = "2001",
abstract = "Abstract
Most oximes as well as their N-alkyl and O-alkyl derivatives are electrochemically reduced in a single four-electron step to the amine. Some exceptions have been reported, where the reduction occurs in two two-electron steps. The reduction of the O-methyloxime grouping in the antibiotic cefetamet occurs at pH 5-9 in two steps, corresponding to a reduction to the imine and amine, respectively. It has been shown that the separation of the two two-electron processes is caused by differences in position and rate of establishment of acid-base equilibria resulting in protonations of the oxime and imino grouping. © 2001 Elsevier Science B.V.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Two-step reduction of the O-methyloxime group in the antibiotic cefetamet",
volume = "507",
pages = "263-267",
doi = "10.1016/S0022-0728(01)00507-1"
}

Kapetanović, V., Aleksić, M.,& Zuman, P.. (2001). Two-step reduction of the O-methyloxime group in the antibiotic cefetamet. in Journal of Electroanalytical Chemistry
Elsevier., 507, 263-267.
https://doi.org/10.1016/S0022-0728(01)00507-1

Kapetanović V, Aleksić M, Zuman P. Two-step reduction of the O-methyloxime group in the antibiotic cefetamet. in Journal of Electroanalytical Chemistry. 2001;507:263-267.
doi:10.1016/S0022-0728(01)00507-1 .

Kapetanović, Vera, Aleksić, Mara, Zuman, P., "Two-step reduction of the O-methyloxime group in the antibiotic cefetamet" in Journal of Electroanalytical Chemistry, 507 (2001):263-267,
https://doi.org/10.1016/S0022-0728(01)00507-1 . .

TY  - JOUR
AU  - Avramov-Ivić, M.
AU  - Kapetanović, Vera
AU  - Aleksić, Mara
AU  - Zuman, P.
PY  - 2000
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/272
AB  - The electroreduction of cefetamet (CEF) using gold and platinum electrodes has been investigated in slightly alkaline medium (pH 8.40) where adsorption, previously observed at mercury electrode, was pronounced. This investigation was performed in order to determine whether the adsorption interferes with the reduction process even at solid electrodes and to compare with a mercury electrode.
AB  - Redukcija cefetameta na elektrodama od zlata i platine je proučavana u slabo alkalnoj sredini (pH 8,40) gde je u prethodnim ispitivanjima na živinoj elektrodi u toku reakcije uočena adsorpcija antibiotika. Ovaj rad je posvećen ispitivanju uticaja adsorpcije na elektroredukciju cefetameta na čvrstim elektrodama i poređenju sa živom.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Electroreduction of cefetamet on mercury, platinum and gold electrodes
T1  - Elektroredukcija cefetameta na elektrodama od žive, platine i zlata
VL  - 65
IS  - 1
SP  - 47
EP  - 53
UR  - https://hdl.handle.net/21.15107/rcub_farfar_272
ER  - 

@article{
author = "Avramov-Ivić, M. and Kapetanović, Vera and Aleksić, Mara and Zuman, P.",
year = "2000",
abstract = "The electroreduction of cefetamet (CEF) using gold and platinum electrodes has been investigated in slightly alkaline medium (pH 8.40) where adsorption, previously observed at mercury electrode, was pronounced. This investigation was performed in order to determine whether the adsorption interferes with the reduction process even at solid electrodes and to compare with a mercury electrode., Redukcija cefetameta na elektrodama od zlata i platine je proučavana u slabo alkalnoj sredini (pH 8,40) gde je u prethodnim ispitivanjima na živinoj elektrodi u toku reakcije uočena adsorpcija antibiotika. Ovaj rad je posvećen ispitivanju uticaja adsorpcije na elektroredukciju cefetameta na čvrstim elektrodama i poređenju sa živom.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Electroreduction of cefetamet on mercury, platinum and gold electrodes, Elektroredukcija cefetameta na elektrodama od žive, platine i zlata",
volume = "65",
number = "1",
pages = "47-53",
url = "https://hdl.handle.net/21.15107/rcub_farfar_272"
}

Avramov-Ivić, M., Kapetanović, V., Aleksić, M.,& Zuman, P.. (2000). Electroreduction of cefetamet on mercury, platinum and gold electrodes. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 65(1), 47-53.
https://hdl.handle.net/21.15107/rcub_farfar_272

Avramov-Ivić M, Kapetanović V, Aleksić M, Zuman P. Electroreduction of cefetamet on mercury, platinum and gold electrodes. in Journal of the Serbian Chemical Society. 2000;65(1):47-53.
https://hdl.handle.net/21.15107/rcub_farfar_272 .

Avramov-Ivić, M., Kapetanović, Vera, Aleksić, Mara, Zuman, P., "Electroreduction of cefetamet on mercury, platinum and gold electrodes" in Journal of the Serbian Chemical Society, 65, no. 1 (2000):47-53,
https://hdl.handle.net/21.15107/rcub_farfar_272 .