Natalija Velić

Natalija Velić
J.J. Strossmayer University of Osijek, Faculty of Food Technology · Department of Process Engineering

Assistant professor, PhD

About

48
Publications
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303
Citations

Publications

Publications (48)
Poster
Full-text available
Konkurentnost na tržištu uvjetuje stalno praćenje tehnoloških napredaka i razvoja (Šerić, 2009). Tržište snack proizvoda, posebice onih koji sadrže krumpir u nekom obliku, u stalnom je porastu, usprkos općoj percepciji kako se radi o proizvodima koji imaju veliku kalorijsku, a malu nutritivnu vrijednost. Međutim, brojna su istraživanja kojima je ci...
Research Proposal
Full-text available
As Guest Editors for a Special Issue of the open access journal Water (ISSN 2073-4441, IF 3.103, http://www.mdpi.com/journal/water/stats), we would like to invite you to publish a feature paper in this issue. The topic of the issue is *Plant- and Microbial-Based Novel Biosorbents*. Either a long review or research paper are encouraged. This Special...
Article
Full-text available
The aim of the study was to prepare a novel adsorbent by chemical modification of hazelnut shells and evaluate its potential for the nitrate removal from model solutions and real wastewater. The characterization of the novel adsorbent, i.e., modified hazelnut shell (MHS) was performed. The adsorbent characterization included the analysis of element...
Article
Full-text available
One of the major challenges in sustainable waste management in the agri-food industry following the “zero waste” model is the application of the circular economy strategy, including the development of innovative waste utilization techniques. The conversion of agri-food waste into carriers for the immobilization of enzymes is one such technique. Rep...
Article
Full-text available
In this study, commercially available traditional blackberry products, namely blackberry wines and blackberry elixirs from Coastal Croatia and Bosnia and Herzegovina, were investigated as sources of bioactive compounds, essential nutrients and metals. Samples were analysed for pH, total polyphenols and monomeric anthocyanins content, individual...
Article
Full-text available
The aim of this work was to investigate grape seeds as a potential adsorbent for nitrate removal from water. Grape seeds were modified by quaternization and the applicability of the modified grape seeds (MGS) was evaluated in batch adsorption experiments. Fixed bed adsorption and regeneration studies were carried out to determine the regeneration c...
Article
Full-text available
The aim of the study was to screen the waste wood biomass of 10 wood species as biosorbents for synthetic dye Congo Red (CR) removal from water and to single out the most efficient species for further batch biosorption experiments. Euroamerican poplar (EP), the most efficient species achieving 71.8% CR removal and biosorption capacity of 3.3 mg g−1...
Article
Full-text available
The presence of heavy metals in an agricultural land is the primary cause of food product toxicity of a herbal and animal origin associated with a contaminated agricultural land. The anthropogenic sources of pollution, especially the fertilizers and pesticides in agriculture, are the primary sources of agricultural land contamination with heavy met...
Article
Full-text available
Blackberry wine is a natural source of bioactive phenolic compounds that have profound antioxidant potential. The objectives of the present research were to assess the phenolic compounds and antioxidant activity of blackberry wines (BW), and to use the chemometric analysis to differentiate among the two groups of samples, i.e., conventional and org...
Article
Full-text available
Blackberry wine is traditionally produced in the continental parts of Croatia and consumed in moderate quantities as a dessert wine. It is often used as a popular remedy for anaemia and iron deficiency, as well as for alleviating sleep disorders, because of its mineral composition comprising among other elements, iron and magnesium. Besides mineral...
Chapter
Many industries produce large quantities of wastewater. Effluents discharged from industries are often highly polluted and could be toxic to aquatic life. Recently, alternative methods for wastewater treatment have been extensively researched. Removal of different pollutants by adsorption on lignocellulosic materials proved to be a promising, cost-...
Article
Waste lignocellulosic material, namely brewers’ spent grain (BSG), was modified by quaternisation, where amino groups were introduced into BSG via the reaction with N,N-dimethylformamide (DMF) and epichlorohydrin. The applicability of the modified BSG (MBSG) for the removal of nitrate ions from model solutions and wastewater was evaluated in batch...
Article
Full-text available
Background and Purpose: Wood and wood processing industries are generators of a substantial amount of waste wood biomass, such as wood chips, shavings and sawdust. Such waste is often unused and its disposal can be a serious environmental problem. Different lignocellulosic waste materials have been successfully used as low-cost adsorbents (biosorbe...
Article
Abstract: Even though traditional raw materials used for beer production include only (barley) malt, hops, water and yeast, a whole range of un-malted adjuncts are also utilised (corn, oats, rice, rye) to get new speciality beer or merely to cut down the production expenses. Furthermore, particular consumers, health-related demands lead to the dev...
Article
Full-text available
Fruit wines production has been growing steadily in recent years, and its market potential is strong, which correlates with the demand for and development of new functional products. Likewise, the production of fruit wines has become an integrated component of fruit processing industry, often compensating for post-harvest losses. Fruit wines repres...
Conference Paper
Full-text available
The applicability of two laboratory-scale bioreactors for solid-state cultivation of white-rot fungus Trametes versicolor TV6 was investigated. Sugar beet pulp (SBP) was used as a non-inert carrier. Two bioreactor configurations were investigated: horizontal bioreactor (HB) and tray bioreactor (TB). SBP biodegradation was observed in both investiga...
Article
Full-text available
Brewers’ spent grain (BSG), a lignocellulosic waste material, was evaluated as a low-cost adsorbent for the removal of synthetic dyes methylene blue (MB) and Congo red (CR) from aqueous solutions in a batch process. Characterisation of the BSG was performed by chemical analysis, FTIR and SEM. The effects of contact time, initial dye concentration,...
Article
Deviations from the normal course of fermentation have been a major problem in wine production. It is important to know the factors affecting the fermentation in order to avoid sluggish or stuck fermentation and prevent economic losses. Numerous studies have shown that deviations from the normal course of fermentation can have multiple causes. This...
Poster
Even though traditional raw materials used for beer production include only (barley) malt, hops, water and yeast, a whole range of un- malted adjuncts are also used (corn, oats, rice, rye) in order to get new speciality beer or simply to cut down the production expenses. Furthermore, special consumers’ health-related demands lead to the development...
Article
Full-text available
Blackberry wine, the most widespread Croatian fruit wine, is produced by yeast fermentation of raw blackberry juice or must. Even though the production and intake of blackberry wine in Croatia has been increasing for years, the available data on the overall quality and blackberry wine composition is still scarce. The objective of this work was to e...
Article
Full-text available
Although β-glucans in cereals are desirable as healthy diet components, high levels of β-glucans in malting barley are unacceptable because they can cause unsatisfactory degradation of cell walls during malting. The aim of this study was to investigate the β-glucan content in twelve Croatian and two German barley varieties at three representative l...
Conference Paper
The objectives of this study were: a) to use the brewers’ spent grain as a biosorbent for the CR removal from aqueous solutions and to evaluate its adsorption properties by batch adsorption experiments; b) to screen different white-rot fungi for their CR decolourisation ability; c) to evaluate the CR decolourization ability of the selected white-ro...
Conference Paper
In this study different lignocelluloses waste materials (brewers spent grain and poplar sawdust) were tested as biosorbents for the removal of cationic dye methylene blue from aqueous solutions. The effects of initial dye concentration (5, 15, 25 and 50 mg L-1), adsorbent concentration (5, 10, 15 and 20 g L-1), temperature (25 and 35 °C) and soluti...
Article
Full-text available
This study brings out the data on the content of 21 mineral and heavy metal in 15 blackberry wines made of conventionally and organically grown blackberries. The objective of this study was to classify the blackberry wine samples based on their mineral composition and the applied cultivation method of the starting raw material by using chemometric...
Poster
The ability of poplar sawdust, a lignocellulosic waste material, for the adsorption of cationic dye malachite green from aqueous solution was studied. Batch experiments were carried out at 25 ⁰C and contact time of 300 min. The effects of the initial dye concentration (15, 25, 35 and 50 mg L-1), adsorbent concentration (5, 10, 15 and 20 g L-1), tem...
Conference Paper
The ability of poplar sawdust, a lignocellulosic waste material, for the adsorption of cationic dye malachite green from aqueous solution was studied. Batch experiments were carried out at 25 °C and contact time of 300 min. The effects of the initial dye concentration (15, 25, 35 and 50 mg/dm3), adsorbent concentration (5, 10, 15 and 20 g/dm3), tem...
Conference Paper
Full-text available
The drying characteristics of sweet potato (Ipomea batatas L.) were investigated using a laboratory convective tray drier at different drying temperatures and pre-treatments. The drying temperatures were 50, 60, 70, 80 °C, and airflow velocity 2.8 ms-1. Different physical and chemical pre-treatments of sweet potato samples were applied as follows:...
Poster
In order to investigate the ion accumulation associated with salt tolerance of blackberry genotype (Rubus fructicosus L. var. čačanska Bestrna), plants were grown in in vitro conditions on solid Driver and Kuniyuki medium (DKW) with addition of 15 and 35 mM NaCl. After 29 days of treatment, samples were collected separately and oven-dried at 72ºC f...
Poster
Introduction and objective: Food mineral content can vary significantly depending on the genetic and climate factors, farming procedures, soil composition, ripeness and many other factors. Furthermore, changes in mineral content usually occur as a result of applied technological procedures, e.g. removal of portion of raw material etc. The objective...
Article
The objectives of this study were to investigate the impact of the initial Fusarium culmorum contamination level on deoxynivalenol (DON) concentrations in wheat, green malt, dry malt, beer and its by-products and to determine the influence of applied unit operations during the wheat beer production process on DON concentrations. Wheat samples with...
Conference Paper
Full-text available
Salinity stress is a constraint to productivity of agricultural crops worldwide. The aim of this study was to explore the effect of salt stress on blackberry plants (Rubus fructicosus L. var. čačanska Bestrna). Plants were subjected to 15 and 35 mM NaCl for 29 days under in vitro conditions and the physiological response was measured. Salt stress (...
Article
Full-text available
The adaptation of commercially available ion-selective electrodes (ISEs) for use in wastewater matrices was demonstrated using multivariate analysis and optimization with the Microsoft Excel Solver tool. The electrodes were characterized in pure analyte solutions, and their parameters were estimated using multivariate analysis and Solver optimizati...
Conference Paper
Full-text available
Salinity is considered as one of the serious abiotic factors that inhibits plant growth and development. Excessive salt concentration in the soil has negative impact on germination and yields and causes enormous damage in overall economic output. In nature salinity is often present in soils which are concurrently affected by drought and/or heat str...
Poster
In this study, white-rot fungus Trametes versicolor was cultivated under solid state conditions using two different laboratory bioreactors (horizontal cylindrical glass bioreactor and tray bioreactor). The aim of the study was to investigate the biological treatment efficiency of lignocellulose material. Sugar beet waste of identical chemical compo...
Poster
This study surveyed the impact of controlled and spontaneous fermentation on the share of biologically active components of organic blackberry wine. The tested samples were divided into two groups according to the applied production technology: samples produced by a process of controlled fermentation (controlled tank cooling, addition of selected y...
Article
Full-text available
The aim of this paper was to determine the enological traits of two commercial yeasts (Fermol Rouge® and Fermol Mediterranée®) in a small scale and to evaluate the possibility of their application in commercial production of blackberry wine. Fermentation activity was monitored by measuring CO2 evolution and CO2 production rate during microfermentat...
Conference Paper
Full-text available
In recent years, there has been an increasing interest in degradation of lignocellulosic materials due to their use as substrates for biofuels and different bioproducts production. Apart from agro-food industry, wood industry is also a generator of large amounts of lignocellulosic residues. The aim of this study was to perform solid-state fermenati...
Poster
INTRODUCTION: Although blackberry wine is a popular fruit wine and traditional product in the continental part of Croatia, the scientific literature on Croatian blackberry wines is scarce and there is no data concerning characterization of wine yeasts for blackberry wine production. In this work, two commercial yeasts were tested in a small scale t...
Article
The platinum disk electrode has been tested as a working electrode for the cathodic reduction of N2O in aqueous solutions using 0.2 M K2SO4 as supporting electrolyte, buffered at pH = 12, and a scan rate of 100 mV s-1. The well-resolved cathodic peaks were observed for the solutions of N2O in the concentration range of 0 - 10.34 mM. A strong linear...
Conference Paper
Full-text available
The aim of this study was to investigate the influence of the solvent, the temperature and the extraction time on the extractability of total flavonoid compounds from conventionally grown milled soybeans variety "Ika", mean particles size 0.5796 mm. The influence of different solvents (water; 50, 60, 70 and 80% aqueous ethanol solution) was investi...
Article
The occurrence of arsenic in natural ground waters is due to geological composition of soil. There are several methods for removal of arsenic from drinking water, such as coagulation followed by filtration, membrane processes, ion exchange and adsorption. Adsorption methods proved to be effective, economic, easy to perform and construct. The object...
Article
This study investigated infection levels with Fusarium graminearum and Fusarium culmorum in malt barley and wheat in eastern Croatia. The contamination was surveyed over three consecutive crop years (2001-2003) on five locations for barley and three wheat cultivating locations. F. graminearum loads reached levels of potentially serious threat for t...
Article
Full-text available
The aim of this study was to investigate the influence of the solvent, the temperature and the extraction time on the extractability of total flavonoid compounds from conventionally grown milled soybeans variety "Ika", mean particles size 0.5796 mm. The influence of different solvents (water; 50, 60, 70 and 80% aqueous ethanol solution) was investi...

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Projects

Projects (2)
Archived project
Project
Blackberry wine production is characterised by wide range of different components share in the final product. The proposed research will lead to standardisation of technological process of blackberry wine production, thus improving the quality of the wine. Research will be performed at laboratory and semi-industrial scale conditions. Standard analytical methods will be applied for biological active compounds analysis. Apart from physical and chemical sample analysis, sensory analysis test methods will also be applied during various research stages. The results will give clear view on dependency between the final quality and production conditions, maturation and storage of blackberry wine. Furthermore, the results will be applied also to wine production using ecologically grown blackberry that is characterised by high content of biological active compounds. Also, the results of the project will be of importance to agricultural producers of blackberries and blackberry wines by strengthening their competitiveness and thus increasing their income.