20.500.12556/RUL-175246 Vpliv tretiranja s toplo vodo in modro LED-svetlobo na jabolka kontaminirana s plesnijo vrste Penicillium expansum The effect of hot water dipping and blue LED light irradiation on apples contaminated with Penicillium expansum V magistrskem delu smo preučevali vpliv namakanja v toplo vodo (HWD) in/ali obsevanja z modro LED-svetlobo (LBL) na fizikalno-kemijske lastnosti jabolk sorte "Idared" ter na rast plesni vrste Penicillium expansum na kontaminiranih plodovih. Jabolka smo najprej obdelali s toplo vodo (52 °C, 2 min), po 24 urah pa smo jih inokulirali s plesnijo in izpostavili LBL. Kontrolna skupina ni bila obdelana in je bila skladiščena v temi. Skupaj smo izvedli 8 različnih obravnav. Obdelava s toplo vodo je v začetni fazi skladiščenja zmanjšala izgubo mase, vendar ni imela pomembnega vpliva na trdoto plodov ali vsebnost topne suhe snovi. Na sproščanje etilena je imela HWD sprva zaviralni učinek, kasneje pa so bile vrednosti višje kot pri kontroli in so takšne ostale vse do konca skladiščenja. Analiza poliaminov je pokazala, da je bil v plodovih najpogosteje prisoten spermidin (SPD), sledila sta γ-aminobutanojska kislina (GABA) in spermin (SPR). Sproščanje etilena je bilo močno negativno povezano s SPD (r = 0,75), kadaverinom (r = –0,68), in zmerno negativno s fenetilaminom (r = –0,53), ter nizko negativno z GABA (r = –0,26). Zmerna pozitivna povezanost z etilenom je bila izražena samo pri SPR (r = 0,38). Obsevanje z LBL ni povzročilo statistično značilnih sprememb v vsebnosti skupnih fenolnih spojin, je pa imelo največji vpliv na spremembo barve plodov, zlasti parametra a*, medtem ko je HWD pomembno zaviral povečanje parametra a*. Nobena izmed obravnav ni imela statistično značilnega vpliva na zaviranje rasti plesni. In this master thesis we investigated the effect of hot water dipping (HWD) and/or blue LED light (LBL) irradiation on the physiochemical properties of "Idared" apples and the growth of Penicillium expansum on inoculated fruit. The apples were first treated with hot water (52 °C, 2 min), after 24 hours, they were inoculated with mold and irradiated with LBL. The control group was not treated and stored in the dark. In total there were 8 treatments. The HWD reduced mass loss during initial storage phase, but had no significant effect on fruit firmness and soluble solids content. Regarding ethylene production, the HWD had an inhibitory effect at the beginning, but later ethylene release was higher compared to the control group and remained higher until the end of storage. The analysis of polyamines revealed that spermidine (SPD) was the most abundant in the fruits, followed by γ-aminobutyric acid (GABA) and spermine (SPR). Ethylene production was strongly negatively correlated with SPD (r = –0,75) and cadaverine (r = –0,68), moderately negatively correlated with phenethylamine (r = –0,53), and weakly negatively correlated with GABA (r = –0,26). A moderately positive correlation with ethylene was found with SPR (r = 0,38). Irradiation of the apples with LBL did not lead to statistically significant changes in the total phenolic compound content, but had a strong influence on the change in fruit colour, especially the parameter a*, while HWD significantly inhibited the increase in the parameter a*. None of the treatments had a statistically significant effect on the suppression of mold growth. jabolka Penicillium expansum obsevanje z modro LED-svetlobo tretiranje s toplo vodo fenolne spojine poliamini premer lezije barva sproščanje etilena topna suha snov trdota izguba mase apples Penicillium expansum blue LED-light irradiation hot water treatment phenolic compounds polyamines lesion diameter color ethylene production soluble solids content firmness mass loss true false false [A. Metelko] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-10-23 07:15:24 2025-10-23 07:15:34 2025-12-07 04:06:15 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 664.8.03:634.11:632.4 267530 254407427 53560.pdf 53560.pdf 1 6B852C2036465DF4B1F4FB2DC5212539 49195f7bf029850d395c5e55d2062d0755ec54f48a30caa32074447df9c6df5a 1a693967-afcf-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=220595 Biotehniška fakulteta 0 0 0