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Traven L.,University of Rijeka | Traven L.,Teaching Institute of Public Health of the Primorsko goranska County
Marine Pollution Bulletin | Year: 2013

In this study, the levels, sources and historical trends (2007-2012) of PAH pollution in surface sediments in the northern Adriatic Sea (Croatia) have been assessed. In addition, ecotoxicological risks have been estimated by evaluating the PAH dataset against Sediment Quality Guidelines (SQGs). The results indicate that PAH in surface sediments are of pyrolitic origin with no clear positive or negative trend in PAH concentration over the investigated period. Evaluations against SQG and mSQGq indicate that surface sediments at all sampling sites have a low to medium ecotoxicological risk. In order to improve trend analysis and characterization of PAH pollution in surface sediments in this region an increase in spatial resolution of sampling points is recommended. © 2013 Elsevier Ltd. Source


Dubrovic I.,Teaching Institute of Public Health of the Primorsko goranska County | Herceg Z.,University of Zagreb | Jambrak A.R.,University of Zagreb | Badanjak M.,University of Zagreb | Dragovic-Uzelac V.,University of Zagreb
Food Technology and Biotechnology | Year: 2011

The purpose of this investigation is to study the influence of high intensity ultrasound and pasteurization on the stability of anthocyanins and their content in strawberry juice. Different ultrasound process parameters for the treatment of juices are compared to the classical thermal treatments. For ultrasound treatments, three parameters were varied according to the statistical experimental design. Central composite design was used to optimize and design experimental parameters: temperature (25, 40 and 55 °C), amplitude (60, 90 and 120 μm) and time (3, 6, and 9 min). It was found that the anthocyanin content after pasteurization (85 °C for 2 min) was reduced by 5.3 to 5.8 % compared to untreated juices. After treatment with ultrasound (20 °C for 3, 6 or 9 min) or thermosonication (40 °C for 3, 6 or 9 min and 60 °C for 3 or 6 min), the degradation of anthocyanins was generally less intensive and was 0.7-4.4 % compared to the untreated juices. Only in the case of ultrasonic treatment at a temperature of 55 °C and treatment time of 9 min the total content of anthocyanins, compared to untreated juice, was reduced by 5.8 to 7.1 %, and their degradation was greater than that of pasteurized juices. From the results it can be concluded that total anthocyanin content was greater in more than 85 % of the selected ultrasound treatments compared to pasteurized juices. Ultrasound treatment can replace pasteurization in terms of preserving total anthocyanin content. The modelling approaches using response surface methodology (RSM) developed in this study exploit data in order to identify the optimal processing parameters for lowering degradation of anthocyanins in strawberry juice during ultrasound processing. Source


Klobucar G.I.V.,University of Zagreb | Stambuk A.,University of Zagreb | Srut M.,University of Zagreb | Husnjak I.,Ministry of Environmental Protection | And 4 more authors.
Environmental Pollution | Year: 2011

There is a growing interest for the application of biomakers to field-collected earthworms. Therefore we have evaluated the usability of native populations of endogeic, widely distributed earthworm Aporrectodea caliginosa in the assessment of soil genotoxicity using the Comet assay. Validation of the Comet assay on earthworm coelomocytes has been established using commercially available Eisenia fetida exposed to copper, cadmium, and pentachlorophenol, along with A. caliginosa exposed to copper in a filter paper contact test. Neutral red retention time (NRRT) assay was conducted on copper exposed and field-collected earthworms. Significant DNA and lysosomal damage was measured using Comet and NRRT assays in native populations of A. caliginosa sampled from the polluted soils in the urban area in comparison to the earthworms from the reference site. The results of this study confirm the employment of A. caliginosa as a suitable species for the in situ soil toxicity and genotoxicity field surveys. © 2011 Elsevier Ltd. All rights reserved. Source


Traven L.,University of Rijeka | Traven L.,Teaching Institute of Public Health of the Primorsko goranska County | Micovic V.,University of Rijeka | Micovic V.,Teaching Institute of Public Health of the Primorsko goranska County | And 3 more authors.
Environmental Monitoring and Assessment | Year: 2013

The present study investigates the response of three hepatic biomarkers in adult sea bass (Dicentrarchus labrax, Linnaeus 1758) caged at a wastewater outlet of an oil refinery with fish caged at a pristine site used as controls. The biomarkers that were investigated were the hepatosomatic index (HSI), 7-ethoxyresorufin-O-deethylase (EROD) activity and glutathione-S-transferase (GST) activity. In addition, we have measured the levels of polycyclic aromatic hydrocarbons (PAHs) and selected heavy metals (lead, cadmium, mercury, copper and zinc) in sediment samples at the polluted site. Although the polluted site had high environmental levels of PAHs and heavy metals, there was no difference in hepatic EROD activity and HSI between fish caged at the polluted site and controls. On the other hand, GST activity was significantly lower in fish caged at the polluted site compared to controls. Our results point out that the studied biomarkers have limited use in environmental risk assessment studies, at least when caged adult sea bass is used as the sentinel species and complex toxicant mixtures are involved. © 2013 Springer Science+Business Media Dordrecht. Source

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