master's thesis
Shelf life of the cold pressed chia seed oil (Salvia hispanica L.)

Lucija Bilić (2015)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Food Engineering
Metadata
TitleOdrživost proizvedenog hladno prešanog ulja chie (Salvia hispanica L.)
AuthorLucija Bilić
Mentor(s)Tihomir Moslavac (thesis advisor)
Abstract
U ovom radu ispitan je utjecaj procesnih parametara hladnog prešanja sjemenki chie (Salvia hispanica L.) na iskorištenje ulja. Ispitan je utjecaj temperature zagrijavanja glave preše, veličine otvora glave preše, frekvencije elektromotora i dotegnutosti glave preše na iskorištenje i kvalitetu hladno prešanog ulja chie. U proizvedenom hladno prešanom ulju chie odredili su se sljedeći parametri kvalitete: peroksidni broj, slobodne masne kiseline, voda, netopljive nečistoće, anisidinski broj, totox broj, jodni broj i saponifikacijski broj. Također, ispitan je i utjecaj dodatka prirodnih antioksidanasa (ekstrakt ružmarina tip Oxy´Less®CS, ekstrakt zelenog čaja, ekstrakt crnog kima, ekstrakt klinčića, eterično ulje konopljike) na oksidacijsku stabilnost hladno prešanog ulja chie. Određivanje oksidacijske stabilnosti ulja, sa i bez dodanog prirodnog antioksidansa, provedeno je testom ubrzane oksidacije ulja – Rancimat testom. Rezultat oksidacije ulja izražen je indukcijskim periodom (IP). Rezultati istraživanja pokazali su da ispitivani procesni parametri hladnog prešanja utječu na iskorištenje ulja. Vede iskorištenje ulja chie dobiveno je kod zagrijavanja glave preše 100 °C, otvora glave preše 8 mm, frekvencije elektromotora 25 Hz i dotegnutosti glave preše ½ kruga. Dodatkom prirodnog antioksidansa ekstrakta ružmarina (Oxy´Less®CS) i ekstrakta zelenog čaja, koncentracije 0,15%, postignut je porast stabilnosti ulja prema oksidacijskom kvarenju.
Keywordsoil chia seed oil pressing oxidative stability antioxidants
Parallel title (English)Shelf life of the cold pressed chia seed oil (Salvia hispanica L.)
Committee MembersVedran Slačanac
Tihomir Moslavac
Stela Jokić
Jurislav Babić
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 date2015-12-21
Parallel abstract (English)
In this thesis, the influence of process parameters cold pressing chia seeds (Salvia hispanica L.) on the yield of oil was tested. The influence of temperature head presses, nozzle size, electromotor frequency and tension head presses on the yield and quality of cold pressed chia seed oil was examined. In the produced cold pressed chia seed oil the following quality parameters were determined: peroxide value, free fatty acids, moisture content, insoluble impurities, anisidine value, totox value, iodine value and saponification value. Also, the influence of the natural antioxidant supplements (rosemary extract type Oxy´Less®CS, green tea extract, extract of black cumin, clove extract, chaste berries essential oil) on the oxidative stability of cold pressed chia seed oil were examined. Determination of the oxidative stability of the oil, with and without added natural antioxidants, has been validated by the test of accelerated oxidation of oil – Rancimat test. The result of oil oxidation was expressed as induction period (IP). The results showed that the studied process parameters of the cold pressing also affect the yield of oil. Greater yield of chia seed oil is obtained at temperature of 100 oC, nozzle of ID 8 mm, frequency of 25 Hz and tension of ½ of the circle. With the addition of the natural antioxidant supplements of rosemary extract type Oxy´Less®CS and green tea extract (0,15% concentration), it is proven to achieve oxidative stability of the oil.
Parallel keywords (Croatian)ulje ulje chia sjemenki prešanje oksidacijska stabilnost antioksidansi
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:036684
CommitterIvana Šuvak