doctoral thesis
Influence of temperature and additives on physical, chemical and sensory properties of corn extrudates

Valentina Obradović (2014)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Carbohydrates Technology
Metadata
TitleUtjecaj temperature i dodataka na fizikalna, kemijska i senzorska svojstva kukuruznih ekstrudata
AuthorValentina Obradović
Mentor(s)Jurislav Babić
Drago Šubarić
Abstract
Cilj ovog rada bio je primjena različitih vrsta sušenog povrća (rajčice, mrkve i bundeve) i askorbinske kiseline u svrhu unaprjeđenja i razvoja ekstrudiranih snack proizvoda. Provedeno je praćenje utjecaja ekstruzije na fizikalne i kemijske promjene pojedinih sastojaka proizvoda. Rezultati su pokazali kako primjena višeg temperaturnog režima procesa ekstruzije (135/170/170 °C) povoljnije utječe na fizikalna svojstva ekstrudata od nižih temperatura (100/150/150 °C). Dodatak povrća i askorbinske kiseline djelovao je na smanjenje tvrdoće, lomljivosti i ekspanzije ekstrudata, a na povećanje nasipne mase. Dodatkom povrća proizveden je proizvod sa povećanim udjelom pepela, vlakana, proteina, polifenola i antioksidativne aktivnosti, a sa smanjenim udjelom masti u odnosu na ekstrudate od čiste kukuruzne krupice. Ksantofili su stabilniji od karotena tijekom ekstruzije, a dodatak askorbinske kiseline smanjio je degradaciju karotenoida uslijed djelovanja termomehaničkih uvjeta u ekstruderu. Ekstrudati proizvedeni pri višoj temperaturi ekstruzije dobili su vrlo visoke ocjene pri senzorskom ocjenjivanju.
Keywordsextrusion tomato carrot pumpkin carotenoids
Parallel title (English)Influence of temperature and additives on physical, chemical and sensory properties of corn extrudates
Committee MembersVerica Dragović-Uzelac (committee chairperson)
Jurislav Babić (committee member)
Drago Šubarić (committee member)
Đurđica Ačkar (committee member)
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Lower level organizational unitsDepartment of Food Technologies
Sub-department of Carbohydrates Technology
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Food Technology
Engineering
UDK664
APPLIED SCIENCES. MEDICINE. TECHNOLOGY
Production and preservation of solid foodstuffs
Study programme typeuniversity
Study levelpostgraduate
Study programmeFood Engineering
Academic title abbreviationdr. sc.
Genredoctoral thesis
Language Croatian
Defense date2014-05-16
Parallel abstract (English)
The aim of this research was the use of different dried vegetables (tomato, carrots and pumpkins) and ascorbic acid in order to enhance and develop the production of extruded snack products. Research of extrusion influence on physical and chemical changes of product ingredients is done. Results showed that applying higher temperature of extrusion process (135/170/170 °C) had favourable effect on physical properties of extrudates compared to lower temperature (100/150/150 °C). The addition of vegetables and ascorbic acid resulted in decreased hardness, fracturability and expansion, but increased bulk density of extrudates. The addition of vegetables produced product with a higher share of ash, fibre, proteins, polyphenols and antioxidant activity, but lower fat compared to pure corn extrudates. Xanthophylls were more stable than carotenes during extrusion. Ascorbic acid reduced carotenoid degradation due to thermomechanical conditions within the extruder. Extrudates produced at higher extrusion temperature had high marks in sensory evaluation.
Parallel keywords (Croatian)ekstruzija rajčica mrkva bundeva karotenoidi snack proizvodi
Extent238 str.; 30 cm
Versionaccepted version
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Noteaccepted version
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:598250
CommitterSanda Hasenay