Bioelektrička impedancijska analiza pri utvrđivanju promjena kvalitete ribe vrste Dicentrarchus labrax

master's thesis

• Title (english): Determination of quality changes Dicentrarchus labrax by bioelectrical impedance analysis
• Author: Barbara Begić
• Mentor: Helga Medić (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for Meat and Fish Technology); Zagreb
• Defense date and country: 2008-04-08, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Cilj rada bio je ispitati primjenu bioelektričke impedancijske analize pri utvrđivanju promjena kvalitete ribe vrste Dicentrarchus labrax (brancin) podvrgnute različitim uvjetima smrzavanja (različita brzina i broj ciklusa). Rezultati su pokazali da se izmjerama reaktancije pri srednjim i visokim frekvencijama može utvrditi razlika između svježih i odmrz¬nutih uzoraka. Prikazom odnosa rezistencije i reaktancije izmjerenih pri frekvencijama od 1 Hz do 1 MHz (R-X dijagram), moguće je utvrditi razliku između svježih i odmrznutih uzoraka. Izmjerama reaktancije pri visokim frekvencijama može se utvrditi razlika između jednog i dva ciklusa smrzavanja i odmrzavanja, kao i razlika u brzini smrzavanja. Primjenom bioelektričke impedancijske analize mogu se bolje utvrditi razlike između svježih i odmrznutih uzoraka, kao i razlike između brzine i broja smrzavanja, nego na jednoj frekvenciji mjerenja.

Abstract (english)

The aim of the thesis was to evaluate bioelectrical impedance method in quality con-trol application of Dicentrarchus labrax (sea bass) subjected to different freezing re-gimes (fast or slow freezing and one or two freezing cycles). Results showed that reactance measured at medium and high frequencies can be used for differentiation between fresh and frozen fish. The difference between fresh and frozen fish can be determined by the presentation of resistance and reactance measured at frequencies from 1 Hz to 1 MHz (R-X diagram). Reactance measured at high frequencies can be used for differentiation between fast and slow- frozen fish and between one and two freezing cycles. Bioelectrical impedance analysis is a better tool for differentia-tion between fresh and frozen fish, fast-frozen and slow-frozen fish as well as be-tween one and two freezing cycles, when compared to single-frequency measure-ments.

• Keywords: brzina smrzavanja; ciklusi smrzavanja; impedancija; kvaliteta; reaktancija
• Keywords (english): freezing cycles; freezing speed; impedance; quality; reactance
• Language: croatian
• URN:NBN: urn:nbn:hr:159:538845
• Study programme: Title: Food Technology; specializations in: Nutrition; Course: Nutrition; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer prehrambene tehnologije; smjer nutricionizam (diplomirani inženjer prehrambene tehnologije; smjer nutricionizam)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-09-04 12:34:33