Wine Science publications

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Browsing Wine Science publications by Author "Asenstorfer, R."

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    Development of anthocyanin-derived pigments in young red wine
    (1998) Jones, G.; Asenstorfer, R.; Australian Society of Viticulture and Oenology Seminar (1997 : Adelaide)
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    Isolation and structures of oligomeric wine pigments by bisulfite-mediated ion-exchange chromatography
    (Amer Chemical Soc, 2001) Asenstorfer, R.; Hayasaka, Y.; Jones, G.
    Methods have been developed that are based on cation exchange chromatography in the absence and presence of excess bisulfite for the isolation of wine pigments from Australian red wine and grape marc extract. The pigments were identified using HPLC and electrospray ionization mass spectrometry. The mass spectral data indicate that these pigments are C4-substituted anthocyanins with a tetracyclic structure. The pigments form a series of closely related oligomeric pigments which include those previously described in the literature, such as pigment A and vitisin A, as well as some newly identified pigments.
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    Screening for potential pigments derived from anthocyanins in red wine using nanoelectrospray tandem mass spectrometry
    (Amer Chemical Soc, 2002) Hayasaka, Y.; Asenstorfer, R.
    Red wine extracts were screened for potential wine pigments derived from anthocyanins, using a combination of nanoelectrospray tandem mass spectrometry techniques. Fourteen aglycons were considered to be of anthocyanidin origin on the basis of their MS/MS spectra. The proposed structures of the aglycons were anthocyanidin C-4 substituted with vinyl linkage between C-4 and the hydroxy group at C-5. The anthocyanidin derivatives identified in the wine extracts were vinyl, vinylmethyl, vinylformic acid, 4-vinylphenol, 4-vinylguaiacol, and vinylcatechin adducts of malvidin as well as vinylformic acid and 4-vinylphenol adducts of peonidin and petunidin. The presence of vinyl alcohol, 4-vinylcatechol, and 4-vinylsyringol adducts of malvidin was also proposed.