diplomsko delo
Nina Šarič (Author), Iztok Prislan (Reviewer), Blaž Cigić (Mentor)

Abstract

V okviru diplomske naloge smo z metodo Rancimat v lanenem in sončničnem olju preverjali antioksidativen učinek izbranih biogenih aminov (spermina, spermidina in tiramina) v koncentraciji 1 mmol/kg, antioksidativen učinek spermina v koncentracijah 1 mmol/kg, 0,4 mmol/kg in 0,1 mmol/kg ter rezultate primerjali z učinkom izbranih antioksidantov (alfa-tokoferol, gama-tokoferol in BHT) v koncentraciji 1 mmol/kg. Vsi dodatki so podaljšali obstojnost olja. Laneno olje oksidira hitreje kot sončnično, saj ima večji delež večkrat nenasičenih maščobnih kislin, predvsem alfa-linolenske. Ugotovili smo, da so biogeni amini pri koncentraciji 1 mmol/kg boljši antioksidanti kot izbrani fenoli in BHT. Najmočnejši antioksidativni učinek smo določili za spermin, ki je upočasnil oksidacijo olj tudi pri najmanjši dodani koncentraciji 0,1 mmol/kg. Te ugotovitve bi lahko imele praktično uporabnost v živilski industriji, vedno več raziskav se namreč osredotoča na iskanje naravnih spojin z antioksidativnim učinkom.

Keywords

biogeni amini;antioksidanti;rastlinska olja;laneno olje;sončnično olje;oksidacija;obstojnost;rancimat;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [N. Šarič]
UDC: 664.34.094.3:577.115:547.233
COBISS: 5047160 Link will open in a new window
Views: 718
Downloads: 4239
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Other data

Secondary language: English
Secondary title: Effect of biogenic amines on the oxidation of vegetable oils determined by rancimat assay
Secondary abstract: In the Bachelor thesis we tested the antioxidative effect of the biogenic amines (spermine, spermidine, tiramine) at the concentration of 1 mmol/kg, antioxidative effect of spermine at the concentrations of 1 mmol/kg, 0,4 mmol/kg, 0,1 mmol/kg and compared the results with the effect of alpha-tocopherol, gamma-tocopherol and BHT at the concentration of 1 mmol/kg in flaxseed and sunflower oil with the Rancimat method. All additions resulted in improved oil stability. Flaxseed oil oxidizes faster than sunflower oil because it contains more polyunsaturated fatty acids, especially alpha-linolenic acid. We concluded that biogenic amines are better antioxidants compared to phenolic compounds alpha- and gamma-tocopherol and BHT at 1 mmol/kg concentration. Spermine was determined to be the strongest antioxidant used in the experiment and it shows the antioxidative effect even at the concentration of 0,1 mmol/kg. Those findings could have the practical implications in food technology as recently many research is focused on finding natural compounds with antioxidative effect.
Secondary keywords: biogenic amines;antioxidants;vegetable oils;flaxseed oil;sunflower oil;oxidation;stability;rancimat assay;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za živilstvo
Pages: VIII, 24 f., [3] str. pril.
ID: 11132594