Udio fenolnih spojeva u listovima posidonije (Posidonia oceanica (L.) Delile) na različitim dubinama u uvali Zaglav, Dugi otok

master's thesis

• Title (english): Content of phenolic compounds in the leaves of seagrass Posidonia oceanica (L.) Delile at different depths in Zaglav bay, Dugi otok
• Author: Janja Maltar
• Mentor: Željka Vidaković-Cifrek (mentor)
• Committee member: Željka Vidaković-Cifrek (predsjednik povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Committee member: Zora Popović (član povjerenstva)
• Committee member: Tajana Preočanin (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013-01-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Morska cvjetnica Posidonia oceanica (L.) Delile endemska je vrsta Sredozemnog mora i jedan od najvažnijih primarnih producenata. Izuzetno je osjetljiva na promjene okolišnih uvjeta. Cilj istraživanja bio je procijeniti jesu li fenolni spojevi i aktivnost enzima gvajakol peroksidaze i polifenol oksidaze pogodni biokemijski pokazatelji učinka okolišnih uvjeta na posidoniju. U tu svrhu korišteni su intermedijarni listovi prikupljeni tijekom četiriju godišnjih doba na 3 i 10 m dubine u luci Zaglav, Dugi otok. Udjeli ukupnih fenola, flavonoida i tanina bio je veći na 3 m dubine i razlikovali su se u pojedinim mjesecima. Antocijana je bilo značajno više u listovima prikupljenim na 3 m. Aktivnost enzima bila je veća je na 10 m dubine, najmanja aktivnost bila je u travnju, a najveća u veljači. Budući da se količina fenolnih spojeva i aktivnosti enzima mijenjala u različitim godišnjim dobima i na različitim dubinama, istraživani pokazatelji su prikladni za praćenje promjena i procjenu stanja u okolišu.

Abstract (english)

Marine phanerogam Posidonia oceanica (L.) Delile is an endemic Mediterranean seagrass and one of the most important primary producers. It is extremely delicate to changes of environmental conditions. The aim of this study was to assess whether phenolic compounds and activities of the enzymes guaiacol peroxidase and polyphenol oxidase are suitable biochemical indicators of environmental changes. For this purpose, intermediate leaves of Posidonia oceanica were collected during four seasons at 3 and 10 m depth, in Zaglav port, Dugi otok. The content of total phenols, flavonoids and tannins were higher at 3 m depth, and differed in samples collected in different months. Anthocyanins were significantly higher in leaves collected at 3 m depth. The enzyme activities were higher at 10 m, the lowest activity was in April, and the highest in February. Since the amount of phenols and enzymes varied in different seasons and at different depths, the investigated parameters are considered to be suitable markers for monitoring and assessment of changes in the environment.

• Keywords: Posidonia oceanica; fenolni spojevi; flavonoidi; antocijani; tanini; gvajakol peroksidaza; polifenol oksidaza; biokemijski pokazatelji
• Keywords (english): Posidonia oceanica (L.) Delile; phenolic compounds; flavonoids; anthocyanines; tannins; guaiacol peroxidase; polyphenol oxidase; biochemical markers
• Language: croatian
• URN:NBN: urn:nbn:hr:217:822479
• Study programme: Title: Integrated undergraduate and graduate university study of Biology and Chemistry Education; specializations in: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Course: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije biologije i kemije (magistar/magistra edukacije biologije i kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-04-27 10:10:13