Linking ATR-FTIR and Raman features to phenolic extractability and other attributes in grape skin

The importance of wine phenolics on the sensory characteristic of red wines is well-known. Therefore, it is necessary to control the extractability of phenolic compounds from grape skins, which depends significantly on grape ripeness and hence, on cell wall degradation. In the present study, attenua...

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Bibliographic Details
Published in:Talanta (Oxford) 2017-05, Vol.167, p.44-50
Main Authors: Nogales-Bueno, Julio, Baca-Bocanegra, Berta, Rooney, Abigail, Miguel Hernández-Hierro, José, José Heredia, Francisco, Byrne, Hugh J.
Format: Article
Language:English
Subjects:
Anthocyanins - analysis
Anthocyanins - isolation & purification
ATR-FTIR spectroscopy
Flavonoids - analysis
Flavonoids - isolation & purification
Grape skins
Hyperspectral imaging
Phenolic extractability
Phenols - analysis
Phenols - isolation & purification
Raman spectroscopy
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis, Raman
Vitis - chemistry
Wine
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Summary:The importance of wine phenolics on the sensory characteristic of red wines is well-known. Therefore, it is necessary to control the extractability of phenolic compounds from grape skins, which depends significantly on grape ripeness and hence, on cell wall degradation. In the present study, attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Raman spectra of grape skin have been recorded. Then, these spectral matrices have been studied and the main spectral features have been linked to extractabilities of phenolic compounds (anthocyanins, flavanols and total phenols). Moreover, spectral differences between external and internal grape skin surfaces also have been studied. It has been confirmed that the amount of polysaccharides and the degree of esterification of pectins have significant influence on the phenolic extractability levels of grape skin tissue. [Display omitted] •Phenolic compounds extractabilities were determined for grape skin samples.•Grape skin Fourier transform infrared (FTIR) and Raman spectra were acquired.•Spectral features were linked to phenolic extractabilities and other grape aspects.•Spectral differences have been found between external and internal skin surfaces.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2017.02.008