Abstract
There is increasing evidence surrounding the health benefits of E-resveratrol; this has triggered interest in stilbenoids in grapes, wine, and by-products. On the one hand, there is an enormous amount of underutilized vine waste, rich in bioactive substances during wine production. On the other hand, there is a growing demand for promising phytochemicals, for dietary and pharmaceutical purposes. Vine shoots are promising sources of stilbenoids; they have economic potential because they are sources of high-value phytochemicals. Recent studies have shown that, due to biosynthesis pathway genes, especially STS (forming trans-resveratrol), which is abundant during storage periods of vine shoots—trans-resveratrol accumulates up to 40-fold. The objective of this research was to determine the most economical part of vine waste to be exploited, and to study the kinetics of resveratrol increase in a 90-day period, to determine the optimal storage period to reach a maximum trans-resveratrol content. Total phenolic content (TPC) and antioxidant activity (AA) were studied to determine possible correlations. In Fetească Neagră vine shoot varieties stored at laboratory temperatures, trans-resveratrol content increased to a maximum (2712.86 mg/kg D.W.) at day 70, and then slightly decreased until day 90. TPC remained constant and there was a slight increase in AA. Vine shoots contained the largest amounts of trans-resveratrol (1658.22 mg/kg D.W.), followed by tendrils (169.92 mg/kg D.W.), and leaves (43.54 mg/kg D.W.).
Highlights
Viticulture is one of the most important agricultural activities in the world; in 2018 approximately 7.4 million hectares were cultivated globally, of which 4.3 million hectares were cultivated in Europe
These results agree with other studies, such as the study by Lachman et al, (2016), which determine the concentration of resveratrol on vine shoots, tendrils, and leaves
Vine shoots had the highest content of trans-resveratrol (12.5 mg/kg D.W.), followed by tendrils
Summary
Viticulture is one of the most important agricultural activities in the world; in 2018 approximately 7.4 million hectares were cultivated globally, of which 4.3 million hectares were cultivated in Europe. The average number of byproducts harvested from annual vine trimmings is 1.3 kg of wood/live log, “accumulating” to 2 × 107 tons of wood in the world. Recent studies have shown that vine waste from annual trimmings accumulate via a wide range of stilbenoids, from resveratrol to complex stilbene oligomers [3]. Thereby, due to the fact that vine waste contains valuable bioactive substances, with potential applications in medicine and agriculture (due to multiple pharmacological and phytopathogenic properties), these can represent promising bioresources [4]
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