prikaz prve stranice dokumenta Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“
Access restricted to students and staff of home institution
master's thesis
Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2021. urn:nbn:hr:159:393379
Pejković Prekslavec, Matija
University of Zagreb
Faculty of Food Technology and Biotechnology
Department of Process Engineering
Laboratory of Thermodynamics

Institutional repository: Repository of the Faculty of Food Technology and Biotechnology

Cite this document

Pejković Prekslavec, M. (2021). Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“ (Master's thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:393379

Pejković Prekslavec, Matija. "Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“." Master's thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2021. https://urn.nsk.hr/urn:nbn:hr:159:393379

Pejković Prekslavec, Matija. "Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“." Master's thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2021. https://urn.nsk.hr/urn:nbn:hr:159:393379

Pejković Prekslavec, M. (2021). 'Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“', Master's thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 04 January 2025, https://urn.nsk.hr/urn:nbn:hr:159:393379

Pejković Prekslavec M. Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“ [Master's thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2021 [cited 2025 January 04] Available at: https://urn.nsk.hr/urn:nbn:hr:159:393379

M. Pejković Prekslavec, "Utjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“", Master's thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:159:393379

Metadata
TitleUtjecaj indirektnog ultrazvučnog predtretmana na utrošak energije, vrijeme sušenja, boju i teksturalna svojstva bundeve „Cucurbita moschata“
Title (english)Influence of indirect ultrasound pre-treatment on energy consumption, drying time, color and textural properties of pumpkin Cucurbita moschata
AuthorMatija Pejković Prekslavec
MentorFilip Dujmić (mentor)
Committee memberMladen Brnčić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
(Department of Process Engineering)
(Laboratory of Thermodynamics)
Zagreb
Defense date and country2021-09-23, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Food Technology
Abstract
Sušenje je jedna od najstarijih metoda konzerviranja namirnica. Osim što produljuje rok trajanja proizvoda i usporava nepoželjne promjene, sušenjem se smanjuje volumen i težina proizvoda, što olakšava transport i skladištenje te smanjuje troškove. Međutim, postupci sušenja mogu dovesti do neželjenih promjena u strukturi, teksturi i izgledu hrane. Nove tehnike kao što je ultrazvuk visokog intenziteta se zbog svog djelovanja na staničnu strukturu tkiva voća i povrća sve više koriste kao metoda predobrade. Cilj ovog rada bio je pratiti i odrediti utjecaj različitih amplituda i trajanja predtretmana ultrazvukom visokog intenziteta, koristeći indirektni ultrazvučni postav, na vrijeme sušenja uzoraka muškatne bundeve, na boju i teksturu, te na potrošnju energije potrebne za sušenje. Najbolji učinak je postignut kod uzoraka koji su prije vakuum sušenja tretirani ultrazvukom amplitude 30 %, u trajanju od 45 min. Osim značajnog skraćenja vremena sušenja od 33 % i utroška energije od 26 %, navedeni uzorci očuvali su svoja teksturalna svojstva. Iako ΔE* vrijednosti boje nakon ultrazvukom potpomognutog sušenja variraju od uočljivih (3,0 – 6,0) do vrlo uočljivih (6,0 – 12,0) uspoređujući s referentnim, boja takvih uzoraka vizualno je prihvatljiva.
Abstract (english)
Drying food is one of the oldest methods of food preservation. In addition to extending shelf life and slowing undesirable changes, drying reduces volume and weight of the product, making it easier to transport and store, thus reducing costs. However, drying methods can lead to negative changes in structure, texture and appearance of the food. New non-thermal technologies such as high-intensity ultrasound are increasingly used as pre-treatment methods due to their effects on the cellular matrix of fruits and vegetables. The aim of this study was to investigate the effects of high-intensity ultrasound treatment with different amplitudes and treatment times, using an indirect ultrasound device setup, on drying time, color, texture, and energy consumption required for drying. The best effect was obtained for the samples pre-treated with an amplitude of 30 % and a duration of 45 minutes and dried in vacuum. In addition to a significant reduction in drying time by 33 % and 26 % reduced energy consumption, the textural properties were also preserved in these samples. Although ΔE* color values after ultrasonic assisted drying vary from noticeable (3.0 - 6.0) to very noticeable (6.0 - 12.0) compared to the reference, color of such samples is visually acceptable.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:159:393379
Study programmeTitle: Food Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka prehrambenog inženjerstva (magistar/magistra inženjer/inženjerka prehrambenog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2021-10-26 08:28:12