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Unveilling the role of technological processes on the strontium isotopic ratio, fingerprint of wines' geographical origin
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Resumo(s)
Based on the close relationship of strontium isotopic ratio 87Sr/86Sr between soil and plants,
this isotopic ratio has been reported as fingerprint tool to verify wine geographical origin and
its authenticity In the last decade, some studies suggested that winemaking applications do
not alter the 87Sr/86Sr isotopic ratios from vineyard to the wine despite the variations of
mineral concentration. However, information about wood impact on 87Sr/86Sr is lacking in the
literature. In this study, we investigated the wood ageing effect on 87Sr/86Sr, and also on the
multi-elemental compositon of wine, which to our best knowledge are novelties, thus
representing important advances to this field of knowledge.
A red wine from Castelão grape variety was aged in stainless steel vats (34,000 L) with oak
wood staves, in triplicate. The wines were sampled after 30, 60 and 90 days of ageing and
evaluated in terms of: 87Sr/86Sr, by Q-ICP-MS after Sr and Rb separation by ion exchange
chromatography; multi-elemental analysis (Be, Mg, Al, Sc, Ti, V, Mn, Co, Ni, Cu, Zn, Ga, Ge,
As, Rb, Sr, Y, Zr, Mo, Sb, Cs, Ba, Pr, Nd, Sm, Eu, Dy, Ho, Er, Yb, Lu, Tl, Pb) by Q-ICP-MS;
Na, K, Ca, Fe by FAAS. Wood ageingWood ageing effect on total polysaccharides
concentration , chromatic characteristics and phenolic composition was also evaluated.
Statistical analysis showed that there was no significant difference of the 87Sr/86Sr between
the control wine and wine aged with wood. The results show that strontium isotopic ratio of
wines was not altered even after ageing with wood (0.710 at initial time and 0.709 after 90
days) despite having a significant increase in Sr concentration by wood stage. This suggests
that 87Sr/86Sr might be used as a reliable geographical indicator. Time had significant impact
on Al, V, Zn, Ni, Cs, Pb and also on Na, K, Ca and Fe while wood stage only altered
concentrations of Mg, V, Co, Ni and Sr. Our study suggests that wood ageing does not
impact the 87Sr/86Sr, accordingly it will shed some light for further studies.
Descrição
Mestrado Vinifera Euromaster - Instituto Superior de Agronomia - UL / Institut National d'Études Supérieurs Agronomiques, Montpellier
Palavras-chave
wine authenticity wood stage strontium isotopic ratio elemental composition 87Sr/86Sr
Contexto Educativo
Citação
Kaya, A.D. - Unveilling the role of technological processes on the strontium isotopic ratio, fingerprint of wines' geographical origin. Lisboa: ISA, 2016, 76 p.