Promjena polifenolnog sastava i antioksidacijskog kapaciteta u sjemenki grožđa sorte Teran tijekom dozrijevanja

master's thesis

• Title (english): Transformation of pholyphenolic composition and antioxidant capacity of grape seeds Teran variety during rippening
• Author: Jurica Cebin
• Mentor: Karin Kovačević Ganić (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); Zagreb
• Defense date and country: 2009-12-18, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

U radu je ispitivana dinamika promjene udjela polifenolnih spojeva u sjemenkama grožđa sorte Teran sa područja Motovuna i Kosinožića tijekom šest tjedana dozrijevanja grožđa. Ukupni polifenolni spojevi, flavanoli, procijanidini i hidrolizirani tanini su određeni metodom sa Folin-Ciocalteovim reagensom. Određivan je i antioksidacijski kapacitet. Za određivanje su primijenjene DPPH, FRAP i ABTS metode. Promatrana je i korelacija između udjela ukupnih polifenolnih spojeva grožđa i antioksidacijskog kapaciteta. Udjel ukupnih polifenola raste tijekom vremena, dok udjel procijanidina pada. Između udjela ukupnih polifenolnih spojeva i antioksidacijske aktivnosti uzoraka sa područja Motovuna postoji značajna korelacija, dok kod onih sa područja Kosinožića samo određena.

Abstract (english)

The subject of this seminar was the dynamic of formation of total phenolics in grape seeds Teran variety from Motovun and Kosinožići area during six weeks. Total phenolics, flavanols, procyannidins and hydrolized were determined using a method that utilizes the Folin-Ciocalteov reagent. For determination of antioxidant capacity the following methods were used: DPPH, FRAP and ABTS method.DPPH, FRAP and ABTS methods. Also, a correlation between total phenolics and antioxidant capacity was to be determined. Total phenolics portion is increasing durging time, while antocyanninid portion is decreasing. It was found that there is a significant correlation between amount of total phenolics in samples from Motovun area and its corresponding antioxidant activity. There is some correlation in the Kosinožići area also, but to the smaller extent.

• Keywords: polifenolni spojevi; antioksidacijski kapacitet; Teran; sjeme; dozrijevanje
• Keywords (english): polyphenols antioxidant capacity; Teran; seed; rippening
• Language: croatian
• URN:NBN: urn:nbn:hr:159:353590
• Study programme: Title: Food Technology; specializations in: Food Engineering; Course: Food Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo (diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-09-01 09:46:51