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Dive into the research topics where Marija Jozanović is active.

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Featured researches published by Marija Jozanović.


Food Chemistry | 2017

Determination of anti-oxidative histidine dipeptides in poultry by microchip capillary electrophoresis with contactless conductivity detection

Marija Jozanović; Mateja Hajduković; Olivera Galović; Gordana Kralik; Zlata Kralik; Nikola Sakač; Martina Medvidović-Kosanović; Milan Sak-Bosnar

A home-made microchip electrophoresis (MCE) device was used to quantitate two biologically important histidine dipeptides, carnosine and anserine, using capacitively coupled contactless conductivity detection (C4D), at pH 2.7. The C4D detector exhibited a linear response to both carnosine and anserine in the range of 0-200μM for the individual dipeptides and in the range of 0-100μM for each dipeptide when both were present as a mixture. The limit of detections (LOD) for the dipeptides in the mixture were 0.10μM for carnosine and 0.16μM for anserine. Standard addition was used to detemine the accuracy of the method. For carnosine and anserine the recoveries were in the range of 96.7±4.9-106.0±7.5% and 95.3±4.5-105.0±5.1% in thigh muscle and 97.5±5.1-105.0±7.5% and 95.3±5.4-97.3±5.6% in breast muscle, respectively.


Analytical Methods | 2017

Determination of anionic surfactants in real samples using a low-cost and high sensitive solid contact surfactant sensor with MWCNTs as the ion-to-electron transducer

Nikola Sakač; Maja Karnaš; Marija Jozanović; Martina Medvidović-Kosanović; Sanja Martinez; Jelena Macan; Milan Sak-Bosnar

Multi-walled carbon nanotubes (MWCNTs) were used as a conducting substrate for construction of an all solid contact anionic surfactant sensor, which used the 1,3-didecyl-2-methylimidazolium–tetraphenylborate (DMI–TPB) ion pair as the sensing element implemented in PVC membranes. Scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) were used for morphological and electrochemical characterisation of the sensor. The investigated sensor showed a Nernstian response for lauryl sulfate (LS), 57.1 mV per decade of activity between 2.0 × 10−7 and 1.1 × 10−3 M; and a sub-Nernstian response for dodecylbenzenesulfonate (DBS), 51.1 mV per decade of activity between 3.6 × 10−7 and 6.6 × 10−4 M. For each ten-fold concentration change, the response time was 7 s (in the range from 1 × 10−6 M to 5 × 10−4 M). The detection limits for LS and DBS in water were 1.2 × 10−7 and 2.6 × 10−7 M, respectively. The sensor revealed a stable potentiometric response at pH 3–13 with a signal drift of 1.9 mV h−1 and exhibited outstanding selectivity performances for LS toward the majority of organic and inorganic anions that are most frequently employed in commercial formulations based on surfactants. The new sensor was applied for end-point location at potentiometric anionic surfactant titrations. Cetyltrimethylammonium bromide (CTAB) was used as a standard cationic titrant in all titrations. Ethoxylated non-ionic surfactants (EONSs) with a higher content of ethoxylated groups in the molecule and higher concentrations of EONSs reduce the magnitude of inflexion of titration curves and may cause a remarkable distortion during anionic surfactant (AS) determination. The sensor was tested by determination of ASs in commercial detergent products. The standard two-phase titration method and a conventional PVC liquid membrane surfactant sensor (PVCSS) showed satisfactory mutual agreement. The low-cost surfactant sensor developed had an operational lifetime of ca. six months.


International Journal of Electrochemical Science | 2017

The Influence of Plasticisers on Response Characteristics of Anionic Surfactant Potentiometric Sensor

Maja Karnaš; Nikola Sakač; Marija Jozanović; Maria Tsakiri; Kopriva, Martina, Kovač-Andrić, Elvira; Milan Sak-Bosnar

Six different plasticisers, 2-nitrophenyl octyl ether (P1), bis(2-ethylhexyl) phthalate (P2), bis (2ethylhexyl) sebacate (P3), 2-nitrophenyl phenyl ether (P4), dibutyl phthalate (P5) and dibutyl sebacate (P6), were incorporated into PVC-based surfactant sensors, and their influence on the determination of anionic surfactants (sodium laurylsulfate (SDS) and sodium dodecylbenzenesulfonate (DBS)) was investigated. Dimethyldioctadecylammonium-tetraphenylborate (DDA-TPB) was used as an ion-pair in the membrane. The sensors containing plasticisers P1– P5 exhibited a sub-Nernstian slope value ranging from −46.4 to −54.8 (mV/decade of activity), while P6 exhibited a super-Nernstian slope value of −66.3 (mV/decade of activity). All the obtained titration curves displayed well defined and sharp inflexion points. Due to the best analytical performance and its low price, the sensor containing dibutyl phthalate (P5) was selected for further investigation. It also provides fast dynamic response and the highest value of potential change at the end-point, allowing reliable end-point location even at low concentration levels of analyte. The linear response renge of the sensor was 6.1 × 10 −3 to 7.2 × 10 −7 M with the sub-Nernstian slope value of −53.1 ± 0.6 (mV/decade of activity) and the lower detection limit of 3.9 × 10 −7 M. The commonly used compounds in product formulations did not interfere with the measurements. Anionic surfactant content was successfully determined in commercial dishwashing detergents.


International Journal of Electrochemical Science | 2014

Direct Potentiometric Determination of Ptyalin in Saliva

Nikola Sakač; Lidija Regušić; Milan Sak-Bosnar; Marija Jozanović; Nevenka Breslauer


International Journal of Electrochemical Science | 2015

Voltammetric Characterization and Determination of Histidine Dipeptides - Carnosine and Anserine

Marija Jozanović; Martina Medvidović-Kosanović; Milan Sak-Bosnar


Natural resources, green technology and sustainable development 3-GREEN2018 | 2018

STARCH AS A CATIONIC SURFACE ACTIVE AGENTS REMOVER - A DIRECT POTENTIOMETRIC STUDY

Marija Kraševac; Maja Karnaš; Hrvoje Babić; Marija Jozanović; Bojan Đurin; Anita Ptiček Siročić; Nikola Sakač


Analytical and Bioanalytical Chemistry | 2018

A simple and reliable new microchip electrophoresis method for fast measurements of imidazole dipeptides in meat from different animal species

Marija Jozanović; Nikola Sakač; Milan Sak-Bosnar; Emanuel Carrilho


Journal of Surfactants and Detergents | 2017

A New Sensor for Determination of Anionic Surfactants in Detergent Products with Carbon Nanotubes as Solid Contact

Nikola Sakač; Marija Jozanović; Maja Karnaš; Milan Sak-Bosnar


International Conference 16th Ružička days “TODAY SCIENCE – TOMORROW INDUSTRY” | 2017

MWCNT SURFACTANT SENSOR: INFLUENCE OF THE SENSOR GEOMETRY ON THE RESPONSE CHARACTERISTICS

Nikola Sakač; Marija Jozanović; Maja Karnaš; Marija Kraševac; Dora Harangozo; Milan Sak-Bosnar


7th International Scientific and Professional Conference Water for all, Book of abstracts | 2017

Electrochemical impedance spectroscopy and potentiometric characterization of tenside sensor with MWCNT

Ljiljana Bečvardi; Nikola Sakač; Martina Medvidović Kosanović; Maja Karnaš; Marija Jozanović; Dora Harangozo; Marija Kraševac; Tomislav Balić; Milan Sak-Bosnar

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Nikola Sakač

Josip Juraj Strossmayer University of Osijek

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Maja Karnaš

Josip Juraj Strossmayer University of Osijek

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Martina Medvidović-Kosanović

Josip Juraj Strossmayer University of Osijek

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Gordana Kralik

Josip Juraj Strossmayer University of Osijek

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Mateja Hajduković

Josip Juraj Strossmayer University of Osijek

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Olivera Galović

Josip Juraj Strossmayer University of Osijek

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