prikaz prve stranice dokumenta Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata
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master's thesis
Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata
Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2012. urn:nbn:hr:109:973988
Pavoković, Mariana
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Carbohydrates Technology

Institutional repository: Repository of the Faculty of Food Technology Osijek

Cite this document

Pavoković, M. (2012). Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY. Retrieved from https://urn.nsk.hr/urn:nbn:hr:109:973988

Pavoković, Mariana. "Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata." Master's thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2012. https://urn.nsk.hr/urn:nbn:hr:109:973988

Pavoković, Mariana. "Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata." Master's thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2012. https://urn.nsk.hr/urn:nbn:hr:109:973988

Pavoković, M. (2012). 'Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata', Master's thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, accessed 15 September 2024, https://urn.nsk.hr/urn:nbn:hr:109:973988

Pavoković M. Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY; 2012 [cited 2024 September 15] Available at: https://urn.nsk.hr/urn:nbn:hr:109:973988

M. Pavoković, "Utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata", Master's thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, Osijek, 2012. Available at: https://urn.nsk.hr/urn:nbn:hr:109:973988

Metadata
TitleUtjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata
Title (english)Effect of extrusion parameters of corn grits on rheological properties of extrudates
AuthorMariana Pavoković
MentorJurislav Babić (mentor)
Committee memberDrago Šubarić (predsjednik povjerenstva)
Committee memberJurislav Babić (član povjerenstva)
Committee memberĐurđica Ačkar (član povjerenstva)
Committee memberMirela Kopjar (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
(Department of Food Technologies)
(Sub-department of Carbohydrates Technology)
Osijek
Defense date and country2012-07-12, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Food Technology
Engineering
Abstract
Ekstruzija je suvremeni postupak obrade različitih vrsta sirovina i proizvodnje širokog spektra prehrambenih proizvoda, pri čemu se kao osnovna sirovina često koristi kukuruzna krupica. Cilj ovog rada bio je utvrditi utjecaj parametara ekstruzije kukuruzne krupice na reološka svojstva ekstrudata. Kukuruzna krupica vlažnosti 15 % i 20 % ekstrudirana je na laboratorijskom jednopužnom ekstruderu Brabender 19/20 DN pri temperaturnom profilu 135/170 °C, uz upotrebu puževa konfiguracije 4:1 i 1:1. Dobivenim ekstrudatima ispitana su fizikalna, termofizikalna i reološka svojstva te su rezultati uspoređeni sa kontrolnim neekstrudiranim uzorcima kukuruzne krupice. Istraživanjem je utvrđeno da je ekspanzijski omjer veći kod ekstruzije pužem 4:1 i pri nižem sadržaju vlage. Nasipna masa je veća kod ekstruzije s većim sadržajem vlage i upotrebom puža konfiguracije 1:1. Moć upijanja kukuruzne krupice povećala se nakon provedenog procesa ekstruzije kod svih uzoraka, a ekstruzija je imala značajan utjecaj i na reološka svojstva, pri čemu se viskoznost vrha smanjila kod svih uzoraka nakon provedenog procesa ekstruzije. Većina uzoraka je pokazala dobru stabilnost tijekom miješanja na visokoj temperaturi, što se može zaključiti iz niskih vrijednosti kidanja, dok „setback“ vrijednosti pokazuju da su neekstrudirani uzorci kukuruzne krupice najskloniji retrogradaciji.
Abstract (english)
Extrusion is a modern procedure for processing different types of raw materials and production a wide range of food products, where corn grits are often used as main raw materials. The aim of this study was to determine the effect of extrusion parameters of corn grits on the rheological properties of extrudates. Corn grits with 15% and 20% moisture content were extruded on a laboratory single screw extruder Brabender 19/20 DN, at temperature profile 135/170 °C, using screws with compression ratio 4:1 and 1:1. Physical, rheological and thermophysical properties of the obtained extrudates were determinated, and results were compared with control samples of nonextruded corn grits. The results showed that the expansion ratio is higher at extrusion with screw 4:1 and at a lower moisture content. Bulk density was higher in extrusion with higher moisture content and with use of screw 1:1. Water absorption index increased after extrusion for all samples, and extrusion had a significant effect on the rheological properties, where the peak viscosity decreased in all samples after extrusion. Majority of samples showed good stability during mixing at high temperature, what can be concluded from the low values of breakdown, while “setback” values indicate that the nonextruded corn grits most tends to retrogradation.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:109:973988
ProjectNumber: 113-1130473-0571
Title: Razvoj novih modificiranih škrobova i primjena u prehrambenoj industriji
Title: Development of new modified starches and their application in food industry
Leader: Drago Šubarić
Jurisdiction: Croatia
Funder: MZOS
Funding stream: ZP
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 on2015-12-14 13:56:38