master's thesis
Prevention of browning and microbiological spoilage of minimally processed pears

Marko Bijelić-Curkić (2011)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Fruits and Vegetables Technology
Metadata
TitleSprječavanje posmeđivanja i mikrobiološkog kvarenja minimalno procesiranih krušaka
AuthorMarko Bijelić-Curkić
Mentor(s)Nela Nedić Tiban (thesis advisor)
Abstract
Mehaničke operacije poput guljenja, rezanja, i dr. koje se provode tijekom minimalnog procesiranja voća čine takve proizvode podložne enzimskom posmeđivanju, mikrobiološkom kvarenju i degradaciji (omekšanju) teksture. Stoga je razvoj sredstava koja sprječavaju, odnosno kontroliraju ove promjene nužan radi očuvanja kakvoće i sigurnosti minimalno procesiranih proizvoda. Danas se sve više istražuje primjena prirodnih antimikrobnih sredstava umjesto kemijski sintetiziranih. Cilj ovog rada bio je istražiti mogućnost primjene otopina heksenala (H), eteričnog ulja Litsea cubeba (LC) u koncentracijama od 50, 100 i 250 ppm, i kalijevog sorbata (KS) u koncentracijama od 1 i 2%, pojedinačno i u kombinaciji najmanje koncentracije s 2%-tnom otopinom askorbinske kiseline (AK), u očuvanju kakvoće minimalno procesiranih krušaka sorte Packham's Triumph tijekom 14 dana skladištenja pri temperaturi 2°C. Rezultati istraživanja su pokazali da se navedena sredstva mogu uspješno rabiti za sprječavanje enzimskog posmeđivanja i mikrobiološkog kvarenja svježe narezanih krušaka. Obrada uzoraka sa kombinacijom 2% AK+50 ppm LC imala je najveći utjecaj na sprječavanje posmeđivanja. Obrade s heksenalom i kalijevim sorbatom su pokazale nešto slabije djelovanje na očuvanje boje krušaka u odnosu na LC. Najbolji antimikrobni učinak tijekom 14 dana skladištenja postignut je obradom uzoraka sa kombinacijom 2% AK+1% KS. Najmanji gubitak čvrstoće je utvrđen na kruškama obrađenim sa otopinama kalijevog sorbata.
Keywordspear minimally processing browning microbiological spoilage
Parallel title (English)Prevention of browning and microbiological spoilage of minimally processed pears
Committee MembersHrvoje Pavlović
Nela Nedić Tiban
Mirela Kopjar
Jurislav Babić
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
Engineering
Study programme typeuniversity
Study levelgraduate
Study programmeFood Technology and Process Engineering
Academic title abbreviationdipl. ing.
Genremaster's thesis
Language Croatian
Defense date2011-09-19
Parallel abstract (English)
Preparation steps such as peeling, cutting, etc which is conducted during minimally processing of fruit caused mechanical injuries, rendering them susceptible to enzymatic browning, microbial spoilage and tissue softening. Therefore, the development of agents which prevented or control these changes is necessary for maintaining quality and safety of fresh-cut products. Today, use of natural antimicrobial agents instead of chemically synthesized is increasing. The aim of this study was to investigate the use of hexenal (H), essential oil Litsea cubeba (LC) in concentration of 50, 100, 250 ppm and potassium sorbate (KS), 1 and 2%, individually and combined in low concentrations with 2% ascorbic acid (AK), to maintain of fresh-cut pear Packham's Triumph quality during 14 days storage at 2 °C. Results showed that used agents can be applied to prevent enzymatic browning and microbial spoilage of fresh-cut pears. Dipping the pears in combination 2%AK+50 ppm LC was the most effective treatment in preventing browning. Lower color preservation was observed in H and KS treatments, considering LC treatments. The best antimicrobial effect during 14 days of storage was achieved in samples treated with combination 2% AK+1% KS. The minimum loss of firmness was obtained in fresh-cut pears treated with KS solutions.
Parallel keywords (Croatian)kruška minimalno procesiranje posmeđivanje mikrobiološko kvarenje
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:109:515177
CommitterIvana Šuvak