Utjecaj različitih skupina polifenolnih spojeva prisutnih u aroniji na njezinu antiradikalnu aktivnost (CROSBI ID 360613)
Ocjenski rad | diplomski rad
Podaci o odgovornosti
Krivak, Petra
Šeruga, Marijan
Jakobek, Lidija
hrvatski
Utjecaj različitih skupina polifenolnih spojeva prisutnih u aroniji na njezinu antiradikalnu aktivnost
U ovom radu istraživana je antiradikalna aktivnost različitih skupina polifenolnih spojeva iz aronije. Ekstrahirane su tri frakcije polifenolnih spojeva. Prva je bila obogaćena flavonolima i fenolnim kiselinama aronije, druga antocijaninima, a treća netopljivim polifenolima i proantocijaninima. Antiradikalna aktivnost frakcija određena je pomoću DPPH metode te je reakcija hvatanja slobodnih DPPH radikala promatrana u vremenu od 300 minuta. Određena je antiradikalna aktivnost pojedinih skupina polifenola računanjem EC50 vrijednosti i ARP vrijednosti („antiradical power“=1/EC50). U aroniji je pronađeno najviše netopljivih polifenola i proantocijanidina (8973 mg/kg svježeg voća), zatim slijede antocijanini (2526 mg/kg svježeg voća), te flavonoli i fenolne kiseline (1029 mg/kg svježeg voća). U ukupnoj antiradikalnoj aktivnosti najveći udio zauzimaju antocijanini (52.5%), a slijede netopljivi polifenoli i proantocijanidini (34.7%) te flavonoli i fenolne kiseline (12.8%). Sve skupine polifenola inhibirale su slobodne radikale kroz duži vremenski period (ovisno o koncentraciji). U reakciji slobodnih radikala s polifenolima aronije primijećena je bifazna reakcija, s periodom u kojem se inhibiranje DPPH radikala odvija brzo, te period u kojem je inhibicija usporena.
aronija (Aronia melanodarpa); antiradikalna aktivnost; flavonoli; fenolne kiseline; antocijanini; proantocijanidini
nije evidentirano
engleski
Influence of different polyphenolic compounds present in Aronia on its antiradical activity
In this thesis the antiradical activity of different groups of polyphenolic compounds from aronia was investigated. Three fractions of polyphenolic compounds were extracted. The first was enriched with flavonols and phenolic acids from aronia, the second with antocyanins, and the third with insoluble polyphenols and proantocyanins. The antiradical activity of different fractions was determined using the DPPH method and the reaction of capturing free DPPH radicals was observed over a period of 300 minutes. The antiradical activity of individual groups of polyphenols was determined by calculations EC50 values and ARP values („antiradical power“=1/EC50). In aronia, insoluble polyphenols and proantocyanidins were present in the largest amount (8973 mg/kg fresh fruit), followed by antocyanins (2526 mg/kg fresh fruit), flavonols and phenolic acids (1029 mg/kg fresh fruit). In the total antiradical activity, antocyanins occupied the largest share (52.5%), followed by insoluble polyphenols and proantocyanidins (34.7%), and flavonols and phenolic acids (12.8%). All groups of polyphenols inhibited free radicals over a long period of time (depending on concentration). In the reaction of free radicals and aronia polyphenols biphase reaction was observed, with a period in which inhibition of DPPH radicals occured rapidly, and the period in which the inhibition was retarded.
aronia (Aronia melanocarpa); antiradical activity; flavonols; phenolic acids; anthocyanins; proanthocyanidins
nije evidentirano
Podaci o izdanju
42
01.07.2010.
obranjeno
109:169805
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