GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide

Drinking water and wastewater treatment facilities often have a chemical oxidationstep for disinfection, the removal of organic micropollutants, color removal and taste andodor control. Among the most commonly used oxidants are chlorine dioxide (ClO2 ), chlorine, and ozone.ClO2 has been increasinglyemployed as disinfectant in water treatment due to its antibacterial and antiviral properties. As a powerful oxidant, ClO2 can remove many organic and inorganic pollutants [1,2]. The aim of the present study was to assess thepotential of ClO2 to oxidize pharmaceutical during water treatment. Therefore, degradation of ibuprofen (IBP) using ClO2 in water was investigated.The degradation under different reaction conditions (concentration of ClO2 : 5, 10, 15 mg/L; concentration of ibuprofen: 10, 20, 35, 60 mg/L; reaction time: from 0.5 to 24 h; pH values: 3, 7, 10) was monitored using high performance liquid chromatography (HPLC) analysis, while mineralization degree was detemined by total organic carbon (TOC) measurements. The highest degree of IBPdegradation in deionized water was obtained by treatment with 15 mg/L ClO2 , using 10 mg/L ibuprofen, at pH = 10, after 24 h of treatment. The obtained degradation degree value under optimal conditions was 99%. TOC analysis of ibuprofen showed reduction in content of organic carbon in the solution. Before degradation TOC content was 7.8 mg/L and after 5.6 mg/L. This showes that degradation and mineralization of ibuprofen occur during this process. The degradation products obtained under optimal conditions were analyzed and confirmed by gas chromatography–mass spectra (GC–MS) and the reaction pathwayswere proposed.From GC chromatograms, degradation products of ibuprofen appeared at following retention times: 4.35 min, 5.12 min, 6.76 min, and 7.05 min. After the analysis of mass spectra, based on the spectral characteristics and the ratio of mass and charge (m/z), it was determined that there are four main degradation products of ibuprofen, after treatment with ClO2.The first characteristic ion appeared at 6.76 min and has m/z 163 (2-(4-methylphenyl) propionic acid). In further degradation path, two products are formed, one of which is a characteristic ion with m/z 57 (2-methylpropane) at 4.36 min, while the other product is further decomposed to give two new products, one of which is also a characteristic ion with m/z 57 (acetic acid) at 5.21 min. Another characteristic ion having m/z 161 (1-ethyl-4-isobutylbenzene) appeared at 7.05 min. ClO2 treatment is an efficient method for IBP degradation.The findings of the present study are very useful for the treatment of drinking waters contaminated with pharmaceutical

Supplementary material for the article: Pergal, M. V.; Kodranov, I. D.; Pergal, M. M.; Dojčinović, B. P.; Stanković, D. M.; Petković, B. B.; Manojlović, D. D. Assessment of Degradation of Sulfonylurea Herbicides in Water by Chlorine Dioxide. Water, Air, and Soil Pollution 2018, 229 (9). https://doi.org/10.1007/s11270-018-3947-2

Supplementary material for: [https://doi.org/10.1007/s11270-018-3947-2]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2203

Surface and thermomechanical characterization of polyurethane networks based on poly(dimethylsiloxane) and hyperbranched polyester

Two series of polyurethane (PU) networks based on Boltorn® hyperbranched polyester (HBP) and hydroxyethoxy propyl terminated poly(dimethylsiloxane) (EO-PDMS) or hydroxy propyl terminated poly(dimethylsiloxane) (HPPDMS), were synthesized. The effect of the type of soft PDMS segment on the properties of PUs was investigated by Fourier transform infrared spectroscopy (FTIR), contact angle measurements, surface free energy determination, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC). The surface characterization of PUs showed existence of slightly amphiphilic character and it revealed that PUs based on HP-PDMS have lower surface free energy, more hydrophobic surface and better waterproof performances than PUs based on EO-PDMS. PUs based on HPPDMS had higher crosslinking density than PUs based on EO-PDMS. DSC and DMTA results revealed that these newlysynthesized PUs exhibit the glass transition temperatures of the soft and hard segments. DMTA, SEM and AFM results confirmed existence of microphase separated morphology. The results obtained in this work indicate that PU networks based on HBP and PDMS have improved surface and thermomechanical properties

Supplementary data for article: Pantelić, M. M.; Zagorac, D. Č. D.; Ćirić, I. Ž.; Pergal, M. V.; Relić, D. J.; Todić, S. R.; Natić, M. M. Phenolic Profiles, Antioxidant Activity and Minerals in Leaves of Different Grapevine Varieties Grown in Serbia. Journal of Food Composition and Analysis 2017, 62, 76–83. https://doi.org/10.1016/j.jfca.2017.05.002

Supplementary material for: [https://doi.org/10.1016/j.jfca.2017.05.002]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2505]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3063

Supplementary material for the article: Pergal, M. V.; Kodranov, I. D.; Pergal, M. M.; Dojčinović, B. P.; Stanković, D. M.; Petković, B. B.; Manojlović, D. D. Assessment of Degradation of Sulfonylurea Herbicides in Water by Chlorine Dioxide. Water, Air, and Soil Pollution 2018, 229 (9). https://doi.org/10.1007/s11270-018-3947-2

Supplementary material for: [https://doi.org/10.1007/s11270-018-3947-2]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2203

Supplementary data for the article: Gojgic-Cvijovic, G. D.; Jakovljevic, D. M.; Loncarevic, B. D.; Todorovic, N. M.; Pergal, M. V.; Ciric, J.; Loos, K.; Beškoski, V.; Vrvić, M. M. Production of Levan by Bacillus Licheniformis NS032 in Sugar Beet Molasses-Based Medium. International Journal of Biological Macromolecules 2019, 121, 142–151. https://doi.org/10.1016/j.ijbiomac.2018.10.019

Supplementary material for: [https://www.sciencedirect.com/science/article/pii/S0141813018332847?via%3Dihub]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/350]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/2799

Supplementary data for the article: Čolić, S. D.; Bakić, I. V.; Dabić Zagorac, D. Č.; Natić, M. M.; Smailagić, A. T.; Pergal, M. V.; Pešić, M. B.; Milinčić, D. D.; Rabrenović, B. B.; Fotirić Akšić, M. M. Chemical Fingerprint and Kernel Quality Assessment in Different Grafting Combinations of Almond Under Stress Condition. Scientia Horticulturae 2021, 275, 109705. https://doi.org/10.1016/j.scienta.2020.109705

Supplementary material for: [https://doi.org/10.1016/j.scienta.2020.109705]Related to published version: [https://cherry.chem.bg.ac.rs/handle/123456789/4081

Phenolic profile of Morus alba L. (mulberry) barrel staves

One of the most important practices in the production of some alcoholic beverages is ageing process. During that process, important changes occur, which results in improved sensory characteristics. The phenolic fraction was considered to be one of the most important parameters for evaluating quality in the choice of good alternative aging wood [3]. So far, mulberry heartwood hasn’t been investigated too much in order to characterize polyphenols. Therefore, the aim of this research was to investigate phenolic profile of industrially dried mulberry staves originating from Serbia. The results showed that mulberry was abundant in oxyresveratrol, taxifolin, (- )-catechin gallate, and phenolic acids, such as protocatechuic, p-hydroxybenzoic and ellagic acid. Characteristic emission spectrum of the wood sample showed the maximum at 420 nm, being blue shifted comparing with the maxima of most hard- and soft- wood species. This may be addressed to a relatively low content of lignin in mulberry wood. The extract showed a maximum characteristic for the major polyphenols of oxyresveratrol and coumarin type

Phenolic profile of Morus alba L. (mulberry) barrel staves

One of the most important practices in the production of some alcoholic beverages is ageing process. During that process, important changes occur, which results in improved sensory characteristics. The phenolic fraction was considered to be one of the most important parameters for evaluating quality in the choice of good alternative aging wood [3]. So far, mulberry heartwood hasn’t been investigated too much in order to characterize polyphenols. Therefore, the aim of this research was to investigate phenolic profile of industrially dried mulberry staves originating from Serbia. The results showed that mulberry was abundant in oxyresveratrol, taxifolin, (- )-catechin gallate, and phenolic acids, such as protocatechuic, p-hydroxybenzoic and ellagic acid. Characteristic emission spectrum of the wood sample showed the maximum at 420 nm, being blue shifted comparing with the maxima of most hard- and soft- wood species. This may be addressed to a relatively low content of lignin in mulberry wood. The extract showed a maximum characteristic for the major polyphenols of oxyresveratrol and coumarin type.Izvod iz knjige apstrakata: [https://cherry.chem.bg.ac.rs/handle/123456789/2842

Application of non-thermal plasma reactor for degradation and detoxification of high concentrations of dye Reactive Black 5 in water

Degradation and detoxification efficiency of high concentrations of commercially available reactive textile dye Reactive Black 5 solution (40, 80, 200, 500, 1000 mg L-1), were studied. Advanced oxidation processes in water falling film based on dielectric barrier discharge in a non-thermal plasma reactor were used. For the first time, this reactor was used for the treatment of high concentrations of organic pollutants such as reactive textile dye Reactive Black 5 in water. Solution of the dye was plasma treated in a thin aqueous solution film that was constantly regenerated. The reactor works as a continuous flow reactor and the electrical discharge itself takes place at the gas-liquid interphase. The dye solution was recirculated through the reactor with an applied energy density of 0-374 kJ L-1. Decolorization efficiency (%) was monitored by UV-Vis spectrophotometry. Samples were taken after every recirculation (similar to 22 kJ L-1) and decolorization percentage was measured after 5 min and 24 h post plasma treatment. The efficiency of degradation (i.e., mineralization) and possible degradation products were also monitored by determination of the chemical oxygen demand (COD) and by ion chromatography (IC). Initial toxicity and toxicity of the solutions after the treatment were studied using Artemia salina test organisms. Efficiency of decolorization decreased with the increase of the dye concentration. Complete decolorization, high mineralization and non-toxicity of the solution ( lt 10 %) were acomplished after plasma treatment using energy density of 242 kJ L-1, while the initial concentrations of Reactive Black 5 were 40 and 80 mg L-1