QUALITY CHARACTERISTICS OF TABLEGRAPE cv. Italia CULTIVATED UNDER PLASTIC COVER IN ORDER TO DELAY HARVEST

undergraduate thesis

• Title: Kvaliteta stolnog grožđa cultivar Italia uzgojenog ispod plastičnog pokrova u cilju odgode berbe
• Author: Iva Marasović
• Mentor: Branka Levaj (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); Zagreb
• Defense date and country: 2015-09-09, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Interdisciplinary Technical Sciences

Abstract

Provedeno je ispitivanje stolnog grožđa cv. Italia proizvedenog ispod dva tipa plastičnog pokrova koji se koriste za odgađanje berbe. Jedan tip plastičnog pokrova bio je eksperimantalni, a drugi komercijalni koji već ima široku uporabu, a razlikuju se po transmisiji i radiomatrijskom spektru. Glavni cilj rada bilo je usporediti završnih promjene glavnih parametara koji opisuju vanjske i unutarnje karakteristike grožđa. Provedeni testovi su: fizička i mehanička svojstva grozda i bobice, glavni sadržaj soka bobice, ukupan sadržaj fenolnih komponenti u pokožici i pulpi, antioksidativna aktivnost pokožice. Rezultati su pokazali da se fizička i mehanička svojstva grožđa jako malo i zanemarivo razlikuju, dok ukupan sadržaj fenola, ponajviše polifenola i flavonoida je veći kod grožđa uzgojenog ispod eksperimentalnog pokrova zbog njegove transmisije većeg spektra ultraljubičastog zračenja što dovodi do povećanja fenolnog sadržaja.

Abstract (english)

In this thesis is included examination conducted on table grapes cv. Italia produced under two types of plastic cover used with the purpose to delay harvest day. One plastic cover was experimental, the other was a commercial type presently widely diffused; they differed in transmissivity to the radiometric spectrum. The main aim of work was to compare final changes regarding the main parameters that describe external and internal features of grape quality. Tests that conducted in this work were run to obtain indication about: physical and mechanical traits of cluster and berry; basic berry juice composition; total content of main skin and pulp phenol compounds; skin antioxidant activity. Results indicated that grape physical and mechanical traits and basic berry juice composition changed a very small extent. The parameters most influenced were the berry phenol contents, especially polyphenols and flavonoids: they were higher in grapes produced under the experimental film, likely due to its higher transmissivity to the ultraviolet wavelength range that is known to stimulate phenol biosynthesis.

• Keywords: stolno grožđe; plastični pokrov; kvaliteta grožđa; ukupni polifenoli
• Keywords (english): table grape; plastic cover; quality charecteristics; total phenol content
• Language: croatian
• URN:NBN: urn:nbn:hr:159:208480
• Study programme: Title: Prehrambena tehnologija; Study programme type: sveučilišni; Study level: preddiplomski; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2015-12-14 09:38:38