diplomsko delo
Kaja Hribar (Avtor), Petra Terpinc (Recenzent), Lea Pogačnik (Mentor)

Povzetek

Kimchi je tradicionalna fermentirana jed, ki izvira iz Koreje. Namen diplomskega dela je bilo pripraviti domači kimchi in ga primerjatis kupljenim. Tako iz kupljenega kot domačega kimchija smo želeli pripraviti vzorce soka in ekstrakte odcejenega kimchija ter v njih določiti skupne fenolne spojine in antioksidativno učinkovitost (AOU). V raziskavi smo uporabili pakirani korejski kimchi baechu znamke Chongga in kimchi, ki smo ga pripravili sami, in sicer s sedemdnevno in tridnevno fermentacijo ter sveži nefermentirani kimchi. V pripravljenih vzorcih soka in ekstrakta kimchija smo pred opravljanjem analiz določili vrednost pH z uporabo pH lističev. Vsebnost skupnih fenolnih spojin smo v vzorcih domačega in kupljenega kimchija določili spektrofotometrično z uporabo Folin‒Ciocalteujevega reagenta in rezultate analize izrazili kot ekvivalent klorogenske kisline. AOU soka in ekstrakta kimchija smo določili z metodo lovljenja radikala DPPH• in rezultate analize podali kot ekvivalent troloksa. Najvišjo AOU smo določili v vzorcu domačega kimchija, ki smo ga pustili fermentirati tri dni (0,22 mg/g v soku in 0,38 mg/g v ekstraktu), in v vzorcu kupljenega kimchija (0,24 mg/g v vzorcu soka in 0,44 mg/g v ekstraktu). Ta dva vzorca sta se tudi najbolj približala v literaturi opisani optimalni vrednosti pH 4,2. Povprečna vrednost skupnih fenolnih spojin v vzorcih soka domačega kimchija znaša 0,27 mg/g, v ekstraktu pa 0,33 mg/g. V soku kupljenega kimchija je vsebnost 0,53 mg/g, v ekstraktu pa 0,42 mg/g. Iz opravljene raziskave lahko sklepamo, da čas fermentacije in vrednost pH, ki jo živilo doseže, vplivata na vsebnost fenolnih spojin in AOU.

Ključne besede

fermentirana živila;kimchi;ekstrakt iz kimchija;fenolne spojine;antioksidanti;antioksidativna učinkovitost;analizne metode;Folin-Ciocalteu;DPPH;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.11 - Diplomsko delo
Organizacija: UL BF - Biotehniška fakulteta
Založnik: [K. Hribar]
UDK: 663/664:547.56:543.2
COBISS: 4830584 Povezava se bo odprla v novem oknu
Št. ogledov: 1617
Št. prenosov: 611
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Analysis of total phenolic compounds and antioxidant activity in kimchi extracts
Sekundarni povzetek: Kimchi is a traditional Korean fermented vegetable containing several ingredients. The purpose of this thesis was to compare homemade nonfermented fresh kimchi as well as kimchi fermented for seven and three days with store-bought kimchi by determining antioxidant activity (AOU) and the total phenolic content in kimchi juice and extracts. In our research, we used beachu kimchi by brand Chongga as well as kimchi made at home from locally bought ingredients. We measured the pH value of our samples with the use of pH paper. Total phenolic content of extracts was determined spectrophotometrically according to Folin‒Ciocalteu method, the results of the analysis were expressed as an equivalent of the chlorogenic acid. AOU was evaluated using DPPH• radical scavenging method. AOU was expressed as trolox equivalent. The highest AOU was determined in homemade kimchi that was left to ferment for three days (0,22 mg/g in juice and 0,38 mg/g in extract) as well as in the store-bought kimchi (0,24 mg/g in juice and 0,44 mg/g in extract). The pH values of these samples were close to the optimum pH value reported elsewhere (pH 4,2). The average total phenolic compounds in homemade kimchi juice was 0,27 mg/g and in in extracts 0,33 mg/g. The total phenolic compounds in store-bought kimchi juice was 0,53 mg/g and in extract 0,42 mg/g. From our research it can be concluded that fermentation duration and the pH value of kimchi affects the total phenolic content and antioxidant activity.
Sekundarne ključne besede: fermented foods;kimchi;kimchi juice;kimchi extracts;total phenolic compounds;antioxidants;antioxidant activity;analytic methods;Folin-Ciocalteu;DPPH;
Vrsta dela (COBISS): Diplomsko delo/naloga
Študijski program: 0
Konec prepovedi (OpenAIRE): 1970-01-01
Komentar na gradivo: Univ. v Ljubljani, Biotehniška fak., Oddelek za živilstvo
Strani: VIII, 23 f.
ID: 10850941