MONITORING OF FRESH CHEESE QUALITY PARAMETERS ON THE MARKET

Zadatak ovog završnog rada je praćenje fizikalno - kemijskih parametara kakvoće svježeg sira. Proizvodnja sira obuhvaća niz tehnoloških procesa i analiza koji su opisani u ovome radu, te definiranih temeljnih zahtjeva i zakonskih regulativa koje svaki subjekt u proizvodnji treba zadovoljiti. U eksperimentalnom dijelu rada provedene su analize svježeg posnog sira kojima se određivao udio vode sušenjem, udio masti po Soxhletu, te stupanj kiselosti svježeg posnog sira. Rezultati navedenih analiza uspoređivani su s podacima koje nalaže zakonodavstvo u svojim pravilnicima.The aim of this final paper is to monitor the physico - chemical parameters of the quality of fresh cheese. Cheese production includes a number of technological processes and analyses described in this paper, as well as defined basic requirements and regulations that each operator in production must meet. In the experimental part of the paper, analyses of fresh low fat cheese were conducted to determine the water content by drying, fat content by Soxhlet method, and the acidity level of fresh low fat cheese. The results of these analyses are compared with the data required by the legislation in its regulations

MONITORING OF FRESH CHEESE QUALITY PARAMETERS ON THE MARKET

Zadatak ovog završnog rada je praćenje fizikalno - kemijskih parametara kakvoće svježeg sira. Proizvodnja sira obuhvaća niz tehnoloških procesa i analiza koji su opisani u ovome radu, te definiranih temeljnih zahtjeva i zakonskih regulativa koje svaki subjekt u proizvodnji treba zadovoljiti. U eksperimentalnom dijelu rada provedene su analize svježeg posnog sira kojima se određivao udio vode sušenjem, udio masti po Soxhletu, te stupanj kiselosti svježeg posnog sira. Rezultati navedenih analiza uspoređivani su s podacima koje nalaže zakonodavstvo u svojim pravilnicima.The aim of this final paper is to monitor the physico - chemical parameters of the quality of fresh cheese. Cheese production includes a number of technological processes and analyses described in this paper, as well as defined basic requirements and regulations that each operator in production must meet. In the experimental part of the paper, analyses of fresh low fat cheese were conducted to determine the water content by drying, fat content by Soxhlet method, and the acidity level of fresh low fat cheese. The results of these analyses are compared with the data required by the legislation in its regulations

Photocatalytic degradation of metoprolol tartrate in suspensions of two TiO 2-based photocatalysts with different surface area. Identification of intermediates and proposal of degradation pathways

This study investigates the efficiency of the photocatalytic degradation of metoprolol tartrate (MET), a widely used β 1-blocker, in TiO 2 suspensions of Wackherr's " Oxyde de titane standard" and Degussa P25. The study encompasses transformation kinetics and efficiency, identification of intermediates and reaction pathways. In the investigated range of initial concentrations (0.01-0.1mM), the photocatalytic degradation of MET in the first stage of the reaction followed approximately a pseudo-first order kinetics. The TiO 2 Wackherr induced a significantly faster MET degradation compared to TiO 2 Degussa P25 when relatively high substrate concentrations were used. By examining the effect of ethanol as a scavenger of hydroxyl radicals (OH), it was shown that the reaction with OH played the main role in the photocatalytic degradation of MET. After 240min of irradiation the reaction intermediates were almost completely mineralized to CO 2 and H 2O, while the nitrogen was predominantly present as NH4+. Reaction intermediates were studied in detail and a number of them were identified using LC-MS/MS (ESI+), which allowed the proposal of a tentative pathway for the photocatalytic transformation of MET as a function of the TiO 2 specimen

Ružička days : International conference 19th Ružička Days “Today Science – Tomorrow Industry” : Proceedings

Dear colleagues, we are extremely honoured to present to you the Proceedings of the international conference 19th Ružička Days, which was successfully held on September 21–23, 2022, in Vukovar, Croatia, in the hometown town of our famous Croatian scientist and first Nobel laureate, professor Leopold (Lavoslav) Ružička. The main goals of the Conference were to promote excellence, originality and innovation of interdisciplinary scientific research as well as the practical application of the obtained results through collaboration with industry, emphasizing thus the recognizable slogan of the Ružička Days conference: "Today Science – Tomorrow Industry". In addition, the Conference gave the opportunity for meetings, exchanging the ideas, opinions, experiences and cooperation among participants from different working surroundings. It is also important to point out that since 2008, within the international conference Ružička Days, Meeting of Young Chemists has also been held, where high school students, with the help of their mentors, present papers in the field of chemistry, with the aim to direct students and young people to the technical and natural sciences, especially chemistry. In its seventh issue (2011, 2013, 2015, 2017, 2019, 2021) the Proceedings publishes scientific and professional full papers of high quality in the following sections: Chemical analysis and synthesis (10), Chemical and biochemical engineering (3), Food technology and biotechnology (4), Chemistry in agriculture and forestry (1), Environmental protection (9) and 8th Meeting of Young Chemists (3). Full-length papers were subjected to an international review procedure done by eminent experts from the corresponding fields, to whom we express our gratitude, but they were not subjected to linguistic proofreading. On behalf of the Scientific and Organizing Committee of the 19th Ružička Days we cordially thank all the authors, reviewers, participants, lecturers, organizers, especially the international organizers EuCheMS and EHEDG, auspices and sponsors, and all the others who, in any way, supported the Conference and contributed to the preparation of the Proceedings, especially to our highly skilled and committed associates, who have put a lot of effort in the preparation of these Proceedings. At the very end, special thanks to our young, future scientists and their mentors who are faithful participants of the Meeting of Young Chemists of the Ružička Days conference. Enjoy the extremely interesting scientific and professional papers contained in these Proceedings, until the next 20th jubilee of Ružička Days in 2024! We are looking forward to meeting you again in Vukovar! Yours sincerely, Chief Editors Jurislav Babić Vesna Ocelić Bulatović Dajana Kučić Grgi