Appearance and interaction of biologically important organic molecules and micronutrient metals in marine ecosystem under environmental stress (AMBIOMERES)
The main aim of the project is to investigate quality and quantity of the seawater organic matter (lipids, acidic polysaccharides and polymeric organic matter containing N catalytic atoms) that is produced in the altering environment. Ecosystem changes that will be followed imply opposite nutritional regimes, oligotrophy and eutrophy, and temperature variations. Further on, this project aims to clarify how variations in the concentrations and forms of these organic substances are reflected in the availability and cycling of micronutrients metals of interest, being Fe, Co, Cu, Zn and Cd.
Oxidant is an ion or a compound that reacts with a certain component of a living cell and oxidizes it. The reactive oxygen species produced in cells include hydrogen peroxide, hypochlorous acid, hydroxyl radical and superoxide anion. Antioxidant is a foreign substance that reacts with the oxidant faster than the components of the cell. An imbalance between oxidants and antioxidants in favour of the oxidants is termed oxidative stress. Antioxidants act as free radical scavengers and therefore can lower the risk of numerous degenerative diseases by preventing damages caused by free radicals. Fruits and vegetables are the major sources of antioxidants in human diet. Several natural compounds found in food, such as polyphenols, vitamins A and E, and some carotenoids, have been found to show excellent antioxidant activity. Chlorophylls and their derivatives have also been reported to possess this activity. However, literature is still scarce regarding their antioxidant properties. It is known that the amount of each antioxidant in fruits, vegetables and their derivatives is strongly influenced by numerous factors such as agro-technical processes, environmental conditions, processing factors and storage conditions. Continuous monitoring of antioxidant capacity of plant-based foods through different phases, from cultivation to storage, is needed to maintain or even improve the beneficial properties of food. The goal of this project is to develop several cyclic multi-pulse voltammetric techniques for the characterization of natural antioxidants and to apply them in routine analysis of food quality. Experimental results will be explained by the comparison with the theoretical simulation of responses of various electrode mechanisms of independent and conjugated multiple redox centers.
Determination of ecotoxic metals load and evaluation of drainage water influence of Zagreb roundabout on Mala mlaka waterwell's,
Determination of ecotoxic metals fro subterranean waters from Mala mlaka water field
Determination of spatial distributions of trace metal concentrations in the Krka River, and the parameters which influence this distribution.
For the first time, spatial and temporal distributions of Hg, Cd, Pb, Cu and Zn trace metals in seawater, sediment and biota of the Mljet National Park were investigated
This project concluded the first systematic research on spatial and temporal distribution of ecotoxic trace metals (Cd, Cu, Hg, Pb and Zn) in aquatic anchialine ecosystems
We studied metal pollution in the sediments of Rijeka harbor, including anthropogenic influence during recent decades and at the present time.
2008, client The Port of Rijeka Authority (http://www.portauthority.hr/, head of the project Ph.D. Neven Cukrov