Zdravkovski, Zoran

Preferred name

Zdravkovski, Zoran

Official Name

Zdravkovski, Zoran

Main Affiliation

zoran@pmf.ukim.mk

Now showing 1 - 9 of 9

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Bioluminescence determination of enzyme activity of firefly luciferase in the presence of pesticides
(Wiley, 2005)
Snezana Trajkovska
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Jean Jacques Aaron
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Filip Spirovski
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Firefly luciferase (EC 1.13.12.5) (FL) is the key enzyme in the firefly bioluminescence method (FB), which is widely used to determine the viability of living cells. The FB method can also be applied to monitoring the influence of different pollutants, such as pesticides. Firefly luciferase is a hydrophobic enzyme and its activity depends on the type of solvent, pH and substances present in the reaction mixture. The influence of three aromatic pesticides, including fenoxaprop-p-ethyl (I), diclofop-methyl (II) and metsulfuron methyl (III), on the enzyme activity was indirectly evaluated through the measurement of emitted light in the bioluminescence reaction, expressed in relative luminescence units (RLU). The reaction mixture used in the bioluminescence measurements consisted of: Tris buffer (pH 7.75), adenosine triphosphate (ATP) and ATP monitoring reagent, where FL is present. Ethanol-water solutions of each pesticide were then added at concentrations of 2.4 x 10(-4)-2.4 x 10(-8) mol/L. The FL activity inhibition factors (FL In%) were determined. The FL activity was maximally inhibited in the presence of all pesticides under study at a concentration of 2.4 x 10(-4) mol/L and was lowered by about 15-26% for pesticide I at concentrations of 2.4 x 10(-5)-2.4 x 10(-8) mol/L, whereas pesticides II and III, applied in the same concentration range, showed smaller FL inhibition values (5.3-20%). The pesticide degradation products (obtained after a 1 month period), measured in the same experimental conditions, in most cases exhibited a much less inhibitory effect on the enzyme activity than the corresponding initial pesticide.
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Monitoring Volatile Organic Compounds in Air Using Passive Sampling: Regional Cross-Border Study between N. Macedonia and Kosovo
(Taiwan Association for Aerosol Research, 2024)
Mula, Vllaznim
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Stanoeva, Jasmina Petreska
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Zeneli, Lulzim
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Degradation and mineralization of sulcotrione and mesotrione in aqueous medium by the electro-Fenton process: a kinetic study
(Springer Science and Business Media LLC, 2012-06)
Murati, Minir
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Oturan, Nihal
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Aaron, Jean-Jacques
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Dirany, Ahmad
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Tassin, Bruno
The degradation and mineralization of two triketone (TRK) herbicides, including sulcotrione and mesotrione, by the electro-Fenton process (electro-Fenton using Pt anode (EF-Pt), electro-Fenton with BDD anode (EF-BDD) and anodic oxidation with BDD anode) were investigated in acidic aqueous medium.
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Assessment of volatile organic compounds in indoor environments across North Macedonia and Kosovo using passive sampling
(Society of Chemists and Technologists of Macedonia, 2024-12-28)
Mula, Vllaznim
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Petreska Stanoeva, Jasmina
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Zeneli, Lulzim
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Berisha, Avni
<jats:p>Humans are exposed to various volatile organic compounds (VOCs) through ingestion, inhalation, or skin contact, potentially leading to adverse health consequences. In this study, the distribution of vari-ous VOCs in indoor air in North Macedonia and Kosovo was investigated for the first time. From March to December 2023, the monthly relative abundance of VOCs was monitored using Radiello® pas-sive/diffusive samplers, followed by gas chromatography mass spectrometry (GC MS) analysis.A total of 60 samples were collected from 17 sites, where over 70 individual VOCs belonging to several classes were identified. Benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds were the most abundant in the chemical stockroom, contributing up to 77.84 % of the total VOC relative abun-dance. In the printing store/workplace, alkylbenzenes were predominant, comprising 69.72 %. Alcohols and ethers were primarily detected in the coffee shop, whereas organosiloxanes were dominant in the hair salon, accounting for 33.87 % and 54.46 % of the total VOCs, respectively. Terpenes were a significant component in the meat factory, representing 65.78 % of the total VOCs, while hydrocarbons were most prevalent in the oil & lubricants store, accounting for 58.23%. Halogenated compounds were primarily found in the superstore, constituting 20.42 % of total VOCs. The VOC composition results indicate that their presence in indoor environments may pose both acute and chronic health risks.</jats:p>
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Application of the electro-Fenton process to mesotrione aqueous solutions: Kinetics, degradation pathways, mineralization and evolution of the toxicity
(Society of Chemists and Technologists of Macedonia, 2014-06-15)
Murati, Minir
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Oturan, Nihal
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Petreska Stanoeva, Jasmina
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Efremova Aaron, Snezhana
<jats:p>The kinetics and the mechanism of degradation of the mesotrione herbicide by three electrochemical advanced oxidation processes (EAOPs) systems, namely electro-Fenton (EF) with Pt anode (EF-Pt), anodic oxidation with BDD anode (AO) and EF-boron doped diamond anode (EF-BDD), were investigated in acidic aqueous solutions. The degradation of mesotrione obeyed apparent first-order reaction kinetics, and its absolute rate constant value with hydroxyl radicals at pH 3.0, determined by the competitive kinetics method, was found to be 8.20 × 108 L mol–1 s–1. Fourteen different mesotrione degradation products were separated and/or identified using HPLC / MSn analyses. A rationalized scheme was proposed for the reaction pathways of mesotrione degradation in the EF process. The mesotrione mineralization yield values ranged between about 58 and 97% for a 6-h electrolysis time, according to the type of EAOP system and the electrolysis current intensity value. The evolution of the toxicity of mesotrione aqueous solutions with electrolysis time (t) was investigated during treatment by the EF-Pt and EF-BDD systems. Toxicity was measured with the Microtox® method, based on the luminescence inhibition of marine bacteria Vibrio fischeri. The curves % inhibition vs. time were found to depend on the toxicity of formed mesotrione degradation products.</jats:p>
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Development of a trap for fuel exhaust particulate matter under driving conditions and GC-MS method for their analysis
(Society of Chemists and Technologists of Macedonia, 2011-06-15)
Todorović, Dejan
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<jats:p>Simple and useful GC/MS method was developed in order to analyze the toluene soluble components in particulate matter from diesel exhaust. Easily adaptable specially designed trap was built which could be mounted on exhaust pipe of different vehicles. It was filled with different materials on which particles were collected. After collection of the particles, the bare trap and different materials were washed and soaked with toluene. In some cases extraction process was speeded up with ultrasonification of the samples for 30 min. Samples were filtered and concentrated to 125‒500 ml and afterwards were directly analyzed by GC/MS. The separated components were identified by Automated Mass Spectral Deconvolution and Identification System (AMDIS) using a specialized user-built library. Five of the identified components[4-methylphenol, 3,3'-dichloro-1,1'-biphenyl, diethyl phthalate, 1,2-benzenedicarboxylic acid, bis(2-methylpropyl) ester and mono(2-ethylhexyl) ester of 1,2-benzenedicarboxylic acid] were found in the European priority lists (Category 1 and Category 2) of endocrine disruptors.</jats:p>
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Elementary, my dear Watson! The making of a collection of the natural elements
(Society of Chemists and Technologists of Macedonia, 2022-06-21)
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<jats:p>A unique collection of samples of the chemical elements has been created and displayed at our Institute of Chemistry. Although whole collections are now commercially available, we decided to use, as much as possible, samples from local resources. The general idea was for each item to have a story, making it more interesting for the students and visitors. We were able to acquire elemental samples mined in Macedonia. Other samples were from our student and research labs, as well as donations from colleagues, and the rest were obtained from commercial sources. A web page was created with all the information on each sample, some of them containing videos. Next to the noble gases, mini Tesla coils were mounted to light up the gases.</jats:p>
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Elementary, my dear Watson! The making of a collection of the natural elements
(Society of Chemists and Technologists of Macedonia, 2022-06-21)
;
<jats:p>A unique collection of samples of the chemical elements has been created and displayed at our Institute of Chemistry. Although whole collections are now commercially available, we decided to use, as much as possible, samples from local resources. The general idea was for each item to have a story, making it more interesting for the students and visitors. We were able to acquire elemental samples mined in Macedonia. Other samples were from our student and research labs, as well as donations from colleagues, and the rest were obtained from commercial sources. A web page was created with all the information on each sample, some of them containing videos. Next to the noble gases, mini Tesla coils were mounted to light up the gases.</jats:p>
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Semi-Quantitative Characterization of Volatile Organic Compounds in Indoor and Outdoor Air Using Passive Samplers: A Case Study of Milan, Italy
(MDPI AG, 2025-09-16)
Mula, Vllaznim
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Zeneli, Lulzim
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Mehmeti, Valbonë
This study presents a semi-quantitative characterization of volatile organic compound (VOC) concentrations and their emission sources in indoor and outdoor environments across four residential and laboratory sites in Milan, Italy, during the summer of 2024. Radiello® passive samplers (Fondazione Salvatore Maugeri in Padova, Italy) were employed for VOC collection, followed by gas chromatography–mass spectrometry analysis. The semi-quantitative mean total VOC (TVOC) concentration was 220.8 ± 195.4 µg/m3 for the outdoor air and slightly higher at 243.6 ± 134.3 µg/m3 for the indoor air, resulting in an indoor-to-outdoor relative ratio of 1.10. The outdoor VOC profile was dominated by hydrocarbons, accounting for 80.3% ± 4.6% (173.2 ± 143.8 µg/m3) of TVOCs, followed by aromatic hydrocarbons at 13.3% ± 5.5% (37.2 ± 49.7 µg/m3). Indoors, hydrocarbons also predominated, representing 34.1% ± 15.2% (95.2 ± 80.1 µg/m3) of the TVOCs, followed by terpenes at 20.7% ± 15.5% (49.0 ± 46.4 µg/m3). Other VOC groups contributed smaller fractions in both environments. The emission profiles from cleaning and personal care products were assessed semi-quantitatively to determine their relative percentage contributions to the indoor VOCs. Source attribution was further supported by diagnostic relative ratios—benzene/toluene, toluene/benzene, and (m + p)-xylene/ethylbenzene—which provided insight into dominant emission sources and photochemical aging.

Zdravkovski, Zoran

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