Multispectral fluorescence sensitivity to acidic and polyphenolic changes in Chardonnay wines – The case study of malolactic fermentation

In this study, stationary and time-resolved fluorescence signatures were statistically and chemometrically analyzed among three typologies of Chardonnay wines with the objectives to evaluate their sensitivity to acidic and polyphenolic changes. For that purpose, a dataset was built using Excitation Emission Matrices of fluorescence (N=103) decomposed by a Parallel Factor Analysis (PARAFAC) and fluorescence decays (N=22), mathematically fitted, using the conventional exponential modeling and the phasor plot representation. Wine PARAFAC component C4 coupled with its phasor plot g and s values enable the description of malolactic fermentation (MLF) occurrence in Chardonnay wines.  The combination of multispectral fluorescence parameters opens a novel routinely implementable methodology to diagnose fermentative processes.

Presenting author: Maxime, Pacheco – UMR PAM

Additionnal authors: Pascale, Winckler | UMR PAM – Dimacell Imaging Facility, Ambroise, Marin | UMR PAM – Dimacell Imaging Facility, Jean-Marie, Perrier-Cornet | UMR PAM – Dimacell Imaging Facility, Christian, Coelho | UMR PAM – Vetagro Sup

Email: maxime.pacheco@agrosupdijon.fr

Keywords: Malolactic fermantation – Traceability – PARAFAC components – Fluorescence lifetime – Phasor plot

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