Utjecaj sorte i područja uzgoja na sastav antocijana i antioksidacijsku aktivnost svježih sokova višnje i višnje Maraske

master's thesis

• Title (english): Effect of cultivar and geographical region on anthocyanin composition and antioxidant activity of fresh juices from sour cherry and Marasca sour cherry
• Author: Mateja Gundak
• Mentor: Branka Levaj (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for Technology of Fruits and Vegetables Preservation and Processing); Zagreb
• Defense date and country: 2014-07-18, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Cilj ovog rada bio je odrediti biološki aktivne tvari, tj. udjele ukupnih fenola, ukupnih i pojedinačnih antocijana te antioksidacijsku aktivnost svježih sokova višnje. Sokovi su proizvedeni u sokovniku, a za potrebe istraživanja upotrebljena su 4 ekotipa višnji s uzgojnih područja u okolici Zadra i Osijeka, a to su: Brač, Maraska, 18, Osječka, te 3 sorte Rexelle, Haimann i Kelleris samo s područja Zadra. Iz dobivenih rezultata može se zaključiti da sokovi višnje sa zadarskog područja imaju veći udjel ukupnih fenola, ukupnih antocijana određen metodom izbjeljivanja i pH-diferencijalnom metodom te pojedinačnih antocijana određen HPLC metodom kao i antioksidacijsku aktivnost određenu FRAP metodom. Među sortama, ističe se Maraska, posebno ekotip Brač, ali statističkom obradom podataka, nije utvrđen signifkantan utjecaj ni sorte, ni područja na udio fenola, antocijana i antioksidacijske aktivnosti ispitivanih sokova višanja.

Abstract (english)

The purpose of this study was to determine a biologically active substance, total fenolic content, total and individual anthocyanin content and antioxidant activity of fresh sour cherry juices. Juices were processed in juice extractor and 4 following ecotypes from geographical region of Zadar and Osijek were used for research: Brač, Maraska, 18, Osječka, and 3 following cultivars Rexelle, Haimann and Kelleris only from Zadar. The results showed that sour cherry juices from Zadar area had higher concentration of total fenolic content, total anthocyanin content determined by bisulphite bleaching method and pH-differential method, individual anthocyanins content determined by HPLC method and antioxidant activity determined by FRAP. Among cultivars, Marasca is distinct from others, especially ecotype Brač. But, ANOVA did not show significant influence of cultivar and/or geographical region on total fenolic content, total and individual anthocyanin content and antioxidant activity of fresh sour cherry juices.

• Keywords: višnja; višnja Maraska; svježi sokovi; antocijani; fenolni spojevi; antioksidacijska aktivnos
• Keywords (english): sour cherry; Marasca sour cherry; fresh juices; anthocyanins; phenol compounds; antioxidant activity
• Language: croatian
• URN:NBN: urn:nbn:hr:159:494375
• Study programme: Title: Food Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka prehrambenog inženjerstva (magistar/magistra inženjer/inženjerka prehrambenog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-02 09:24:42