master's thesis
The impact of pressing condtitions of pumpkin seed and adding antioxidants on yield and shelf life of cold pressed oil

Tena Jurić (2016)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Food Engineering
Metadata
TitleUtjecaj prešanja koštica buče i dodatka antioksidanasa na iskorištenje i održivost hladno prešanog ulja
AuthorTena Jurić
Mentor(s)Tihomir Moslavac (thesis advisor)
Maja Molnar (thesis advisor)
Abstract
U radu je istraživan utjecaj uvjeta prerade bučinih koštca na iskorištenje i oksidacijsku stabilnost ulja. Ispitvani su utjecaji frekvencije elektromotora i veličine otvora glave preše. Povećanjem frekvencije elektromotora i veličine otvora glave preše za izlaz pogače dolazi do smanjenja količine proizvedenog ulja. Primjenom standardnih metoda određeni su osnovni parametri kvalitete ulja: peroksidni broj, slobodne masne kiseline, udio netopljivih nečistoća i udio vlage. Također, ispitvana je stabilnost hladno prešanog ulja s i bez dodatka antoksidanasa u količini od 0,1 %. Za oksidacijsku stabilnost bučinog ulja koristli su se prirodni antoksidansi ekstrakt nara i ružmarina, eterično ulje rtanjskog čaja i bosiljka uz dodatak ekstrakta zelenog čaja. Od sintetnskih antoksidanasa korišteni su 7E, 8E, 9E i 27N + 28N. Određivanje oksidacijske stabilnost bučinog ulja provedeno je testom ubrzane oksidacije - Schaal Oven testom (63°C), a rezultat oksidacije ulja izražen je peroksidnim brojem. Najbolje antoksidacijsko djelovanje kod ispitvanog ulja pokazao je dodatak mješavine eteričnog ulja rtanjskog čaja i ekstrakta zelenog čaja (50:50).
Keywordsoil pumpkin seed oil screew press antoxidant
Parallel title (English)The impact of pressing condtitions of pumpkin seed and adding antioxidants on yield and shelf life of cold pressed oil
Committee MembersVedran Slačanac (committee chairperson)
Tihomir Moslavac (committee member)
Maja Molnar (committee member)
Jurislav Babić (committee member)
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Lower level organizational unitsDepartment of Food Technologies
Sub-department of Food Engineering
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Food Technology
Engineering
Study programme typeuniversity
Study levelgraduate
Study programmeFood Engineering
Academic title abbreviationmag. ing. techn. aliment.
Genremaster's thesis
Language Croatian
Defense date2016-10-05
Parallel abstract (English)
In this paper was reasarched the impact of pumpkin seed processing conditons on oil yield and oxidaton stability. Size of the press head hatch and the screw speed (electromotor frequency) was investgated. Their increasing results reducton of oil. Walnut oil quality parameters were determined by applying standard methods: peroxide value, free fatty acids, the proporton of insoluble impurites and moisture. Also, oil stability was tested with and without antoxidant in amunt of 0,1%. For the oxidaton stability was used natural antoxidant: rosemary extract and pomegranate extract and basil volatle oil and essental rtanj tea all with green tea extract and sintetc antoxidant like 7E, 8E, 9E and 27N + 28N. Determinaton of oxidaton stability of oil, and the influence of antoxidant aditon was performed with rapid oil oxidaton test – Schaal Oven test (63°C). The result of oil oxidaton was expressed as peroxide value during 4 days of the test. The best antoxidant actvity of examined oil show the use of essental rtanj tea with green tea extract.
Parallel keywords (Croatian)ulje bučino ulje pužna preša antoksidansi
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:680796
CommitterIvana Šuvak