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Home    Μεταβολή της συγκέντρωσης των διγλυκεριδίων στον καρπό της ελιάς κατά την ωρίμανση και των πολυφαινολών στις επιτραπέζιες ελιές.Μια μελέτη με τη φασματοσκοπία 31P NMR  

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Identifier uch.chemistry.msc//2005tsironi
Title Μεταβολή της συγκέντρωσης των διγλυκεριδίων στον καρπό της ελιάς κατά την ωρίμανση και των πολυφαινολών στις επιτραπέζιες ελιές.Μια μελέτη με τη φασματοσκοπία 31P NMR
Creator Tsironi, Vagia
Abstract The present dissertation describes the variation of the diglyceride content in olive fruits during maturation. It was found for the first time that 1,3-diglycerides are formed primarily in olive fruit and their concentration tends to increase as maturation progresses. On the other hand, the concentration of 1,2-diglycerides, which constitutes the major diglyceride isomers, tends to diminish upon maturation. The second aim of this study was the detection and quantification of phenolic compounds in table oils, by employing 31P NMR spectroscopy. In particular, phosphitylation of the hydroxyl and carboxyl groups of phenolic compounds with the phosphorous reagent 2-chloro-4,4,5,5-tetramethyl dioxaphospholane allows for the detection of several phenolic compounds on the basis of 31P chemical shifts in their respective 31P NMR spectra. Moreover, by using the phosphitylated cyclohexanol as an internal standard and upon integration of the appropriate signals in the 31P-NMR spectra, quantification of the phosphitylated phenolic compounds was achieved. Finally, the effect of processing methods on the concentration of phenolic compounds was discussed.
Subject 31P NMR spectroscopy, olive fruit, diglycerides, phenolic compounds,Φασματοσκοπία NMR, Ελαιόκαρπος, Διγλυκερίδια, Πολυφαινόλες
Issue date 2005-07-01
Date available 2007-02-09
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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