Mateja Grubor
University of Zagreb
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Featured researches published by Mateja Grubor.
Drying Technology | 2018
Joanna Politowicz; Krzysztof Lech; Lucía Sánchez-Rodríguez; Adam Figiel; Antoni Szumny; Mateja Grubor; Ángel A. Carbonell-Barrachina
ABSTRACT The smell of food is one of the most important factors in assessing its quality. In this study, the influence of drying method on aroma/volatile compounds of oyster mushrooms (Pleurotus ostreatus Jacq.) was evaluated. The drying methods tested were convective drying (CD), freeze-drying (FD), vacuum microwave drying (VMD), and a combination of convective predrying and VM finish drying (CPD–VMFD). The volatile compounds were extracted by solid-phase microextraction and identified by gas chromatography–mass spectrometry. The best fitting model to describe the drying kinetics of the oyster mushroom was Henderson and Pabis model. Thirty-four volatiles in fresh oyster mushrooms were identified, with 3-octanone (2,890 µg/100 g dry basis) and 3-octanol (991 µg/100 g) being the major components. The total concentration of volatiles of fresh mushroom (4,506 µg/100 g) was drastically reduced by all drying treatments, although the highest contents were found after: (i) CPD (50°C)–VMFD (480 W) (245 µg/100 g) and (ii) VMD at 480 W (143 µg/100 g). According to the sensory data, the products dried using the treatment CPD (50°C)–VMFD (480 W) were those closer to the fresh mushrooms.
International Agrophysics | 2017
Tajana Krička; Ana Matin; Nikola Bilandžija; Vanja Jurišić; Alan Antonović; Neven Voća; Mateja Grubor
Abstract In the context of the growing demand for biomass, which is being encouraged by the EU directives on the promotion of the use of renewable energy, recent investigations have been increasingly focused on fast-growing energy crops. The aim of this study was to investigate the energy properties of three types of agricultural energy crops: Arundo donax L., Miscanthus × giganteus and Sida hermaphrodita. This investigation looked into the content of non-combustible and combustible matter, higher and lower heating values, lignocellulose content, and biomass macro-elements. The results indicate that the energy values of these crops are comparable, while their lignocellulose content shows significant variations. Thus, Arundo donax L. can best be utilised as solid biofuel due to its highest lignin content, while Miscanthus × giganteus and Sida hermaphrodita L. can be used for both liquid and solid biofuels production. As far as Arundo donax L. is concerned, a higher ash level should be taken into consideration.
Journal on Processing and Energy in Agriculture | 2017
Nikola Bilandzija; Vanja Jurišić; Neven Voća; Josip Leto; Ana Matin; Mateja Grubor; Tajana Krička
The aim of this study is to determine the calorific values, chemical composition (proximate and ultimate analysis, micro and macro elements) and cell structure (composition of lignocellulose) of Miscanthus x giganteus biomass cultivated in Croatian. Research results represents the average values of biomass (n = 108) cultivated at two locations in Croatia (Bistra, Medvednica), during the three-year research period, three harvest periods (autumn, winter, spring) per year and two fertilizer treatments (N0 i N50). Determined average values of some important parameters are: low calorific value - 17.25 MJ/kg, ash content - 1.49 %, carbon content - 48.75 %, nitrogen content - 0.47 %, sulfur content - 0.07 %, cellulose content - 49.22 % and lignin content - 29.25 %. The obtained results have shown that Miscanthus x giganteus has potential to be a significant source of good quality raw material in the production of solids biofuels.
Journal on Processing and Energy in Agriculture | 2017
Ana Matin; Tajana Krička; Vanja Jurišić; Neven Voća; Julijana Zunic; Mateja Grubor
The aim of this paper was to determine the impact of different air temperature (60 °C, 80 °C and 100 °C) at air drying velocity of 1.0 ms-1 during convection drying thermal process on the sunflower seeds oil and ash content. The research was conducted at 4 different sunflower seeds hybrid Apollo, NK Brio, PR 63 and PR 90 A 63 D 82, which by their characteristics are early and medium early hybrids.. Based on the results, the curve of water speed release from the sunflower seeds, the activation energy, as well as changes in oil content and ash content before and after the convective drying was obtained. It was established that the NK Brio hybrid fastest release water compared to other hybrids during drying which is confirmed by minimum value of activation energy and that the increasing of air drying temperature increases oil content, while reduces ash content.
Renewable & Sustainable Energy Reviews | 2018
Nikola Bilandzija; Neven Voća; Barbara Jelcic; Vanja Jurišić; Ana Matin; Mateja Grubor; Tajana Krička
Transactions of Famena | 2018
Nikola Bilandžija; Neven Voća; Josip Leto; Vanja Jurišić; Mateja Grubor; Ana Matin; Anja Geršić; Tajana Krička
Proceedings SA 2018 | 2018
Tajana Krička; Nikola Bilandžija; Alan Antonović; Vanja Jurišić; Ana Matin; Neven Voća; Mateja Grubor
Zbornik sažetaka 24. međunarodno savjetovanje Krmiva 2017 | 2017
Mateja Grubor; Tajana Krička; Vanja Jurišić; Neven Voća; Nikola Bilandžija; Josip Leto; Alan Antonović; Ana Matin
Proceedings SA 2017 | 2017
Mateja Grubor; Tajana Krička; Vanja Jurišić; Alan Antonović; Neven Voća; Nikola Bilandžija; Ana Matin
Proceedings SA 2017 | 2017
Ana Matin; Tajana Krička; Alan Antonović; Neven Voća; Vanja Jurišić; Nikola Bilandžija; Iva Pankretić; Mateja Grubor; Danijela Slipčević