master's thesis
Influence of preparation of green, yellow and black tea on phenol content and tea colour

Marija Šaravanja (2011)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Fruits and Vegetables Technology
Metadata
TitleUtjecaj načina pripreme crnog, zelenog i žutog čaja na sadržaj polifenola i boju čajeva
AuthorMarija Šaravanja
Mentor(s)Mirela Kopjar (thesis advisor)
Abstract
U ovom radu ispitivan je utjecaj vremena i temperature maceracije tijekom pripreme zelenog, žutog i crnog čaja na sadržaj polifenola, flavonoida, kondenziranih tanina, antioksidativnu aktivnost i boju. Čajevi su macerirani pri 70 i 90 °C kroz 3 donosno 5 minuta. Ispitivan je i utjecaj ponovljene maceracije istih uzoraka na sadržaj navedenih komponenti. Maceracijom uzoraka pri 90 °C, u uzorcima je određeno više polifenola, flavonoida, kondenziranih tanina, te su vrijednosti antioksidativne aktivnosti bile veće. Ponovljenom maceracijom sadržaj polifenola, flavonoida i kondenziranih tanina bio je znakovito manji. Vrijednosti antioksidativne aktivnosti su također bile niže nakon ponovljene maceracije. Vrijeme i temperatura maceracije su imali i znatan utjecaj na boju pripremljenih čajeva, a ponovljenom maceracijom došlo je do znakovitogg smanjenja intenziteta boje.
Keywordstea phenols flavonoides colour maceration
Parallel title (English)Influence of preparation of green, yellow and black tea on phenol content and tea colour
Committee MembersVlasta Piližota
Mirela Kopjar
Jurislav Babić
Nela Nedić Tiban
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Lower level organizational unitsDepartment of Food Technologies
Sub-department of Fruits and Vegetables Technology
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Food Technology
Food Chemistry
Study programme typeuniversity
Study levelgraduate
Study programmeFood Engineering
Academic title abbreviationmag. ing. techn. aliment.
Genremaster's thesis
Language Croatian
Defense date2011-11-28
Parallel abstract (English)
In this work, influence of time and temperature of maceration of green, yellow and black tea on content of phenols, flavonoides, condensed tannins, antioxidant activity and colour was investigated. Maceration temperatures of tea were 70 and 90 °C and maceration time 3 and 5 minutes. Also, influence of repeated maceration of same samples on mentioned parameters was investigated. All samples macerated at 90 °C had the highest content of phenols, flavonoides, condensed tannins and antioxidant activity. After repeated maceration content of mentioned compound was lower. Time and temperature of maceration, also had influence on colour of tea samples. With repeated maceration intensity of colour decreased.
Parallel keywords (Croatian)čaj polifenoli flavonoidi boja maceracija
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:278783
CommitterSanda Hasenay