Abstract
For the first time, the boron isotopic ratio is reported for Brazilian red wines. The boron concentration, 11B/10B isotopic ratio and δ11B were determined in 89 red wines produced in Campanha Gaucha, Serra Gaucha (SG), and Vale dos Vinhedos (VV) in South Brazil and Vale do Sao Francisco (VSF) in Northeast Brazil. A broad boron concentration range, < 0.07 to 20.4 mg L-1, was observed, where a few values were above the maximum allowed concentration according to the International Code of Oenological Practices (14.0 mg L-1). The obtained 11B/10B ratios were quite different from those observed in the literature. The ratios were quite similar among the Southern Brazilian wine producing areas, but a large difference was observed when compared with the Northeastern wines, allowing for the differentiation between these two important Brazilian wine regions. The results have also shown that is possible, based on the boron isotopic ratio, to differentiate the Brazilian red wines from Chilean, Italian and Portuguese red wine.
Highlights
Boron has two natural isotopes, 10B (19.9%) and 11B (80.1%),[1] and is an oligo-element essential to plant health and growth
According to Vorster et al.,[7] if the natural variation in the 11B/10B ratio of the soil is reflected in the vines, it can become an important tool in provenance studies of agricultural products, such as wines, helping to minimize adulteration and fraud in these products
If ethanol has an influence on the 11B peak, the 11B/10B ratio should increase with ethanol content
Summary
Boron has two natural isotopes, 10B (19.9%) and 11B (80.1%),[1] and is an oligo-element essential to plant health and growth. The present study represents the first study of the boron isotopic ratio in Brazilian red wines. Based on the obtained boron content, the samples were diluted to obtain a boron concentration of approximately 20 μg L-1, in order to avoid dead-time corrections during isotopic ratio determination.[17]
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