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Relation of physical quality parameters to accumulation, distribution and stability of anthocyanins and other phenolic compounds of strawberry (Fragaria ananassa) fruit
ID Šimková, Kristýna (Author), ID Jakopič, Jerneja (Mentor) More about this mentor... This link opens in a new window

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Abstract
In this dissertation, we studied the effect of environmental conditions, fruit size, and ripening stage on the content of individual anthocyanins and other phenolic compounds, as well as their distribution within the fruit, and their stability during the freezing and thawing process. Our results showed that the anthocyanin and total phenolics content is higher in everbearing strawberries harvested after days with longer sunshine duration. Additionally, we found that the content of anthocyanins was higher in the outer part of the fruit, which also leads to a higher content of anthocyanins in strawberry fruit of smaller size. Moreover, the content of anthocyanins and phenolic compounds changes during the ripening process. While at the beginning of the ripening, the content of hydroxybenzoic acid derivates and flavanols was higher at the beginning of the ripening, the content of anthocyanins and hydroxycinnamic acid derivates increased during ripening. However, the profile and content of anthocyanins and phenolic compounds differed among cultivars. Therefore, it is necessary to assess each cultivar separately. The content of anthocyanins and phenolic compounds also changes during the process of freezing and thawing. While the metabolites are quite stable during the frozen storage, the content can significantly decrease during the thawing process. The only thawing process which did not affect the content of anthocyanins and phenolic compounds was microwave thawing.

Language:English
Keywords:harvest time, fruit size, freezing, thawing, anthocyanins, phenolic compounds
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:BF - Biotechnical Faculty
Year:2024
PID:20.500.12556/RUL-160000 This link opens in a new window
COBISS.SI-ID:203861251 This link opens in a new window
Publication date in RUL:07.08.2024
Views:275
Downloads:43
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Secondary language

Language:Slovenian
Title:Povezava fizikalnih kakovostnih parametrov z akumulacijo, razporeditvijo in obstojnostjo antocianov ter drugih fenolnih snovi v plodovih žlahtnega jagodnjaka (Fragaria ananassa)
Abstract:
V doktorski disertaciji smo proučevali vpliv okoljskih dejavnikov, velikosti plodov in stopnje zrelosti na vsebnost posameznih antocianov in drugih fenolnih spojin ter njihovo porazdelitev v jagodah. Raziskali smo stabilnost metabolitov med postopkom zmrzovanja in odtaljevanja. Rezultati so pokazali, da je pri večkrat rodnih jagodah vsebnost antocianov in skupnih fenolov večja v plodovih, obranih po obdobju z daljšim sončnim obsevanjem. Dodatno smo ugotovili, da je vsebnost antocianov večja v zunanjem delu ploda, kar pomeni večjo vsebnost antocianinov v manjših plodovih. Potrdili smo spremembe vsebnosti antocianov in fenolnih spojin med dozorevanjem. Medtem ko je bila vsebnost derivatov hidroksibenzojskih kislin in flavanolov večja v začetnem obdobju, so se med zorenjem v plodovih kopičili antociani in derivati hidroksicimetnih kislin. Razlika se je pokazala tudi v sestavi ter količini antocianov in fenolnih spojin med sortami, zato je za natančno določitev potrebno raziskati vsako sorto posebej. Med postopkom zmrzovanja in odtaljevanja smo spremljali stabilnost antocianov in drugih fenolnih snovi ter ugotovili, da njihova vsebnost spreminja; medtem ko so med skladiščenjem v zamrznjenem stanju precej stabilni, se lahko vsebnost med odmrzovanjem znatno zmanjša. Izmed vseh štirih analiziranih postopkov odtaljevanja, edino taljenje v mikrovalovni pečici ni vplivalo na vsebnost antocianinov in fenolnih spojin.

Keywords:termin obiranja, velikost plodov, zmrzovanje, odtajevanje, antociani, fenolne spojine

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