Polyphenols and Resveratrol from Discarded Leaf Biomass of Grapevine ( Vitis sp.): Effect of Cultivar and Viticultural Practices in Estonia

Reelika Rätsep, Kadri Karp, Mariana Maante-Kuljus, Alar Aluvee and Rajeev Bhat
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Reelika Rätsep: ERA Chair for Food (By-) Products Valorisation Technologies (Valortech), Estonian University of Life Sciences, Fr. R. Kreutzwaldi 1a, 51014 Tartu, Estonia
Kadri Karp: Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Fr. R. Kreutzwaldi 1, 51006 Tartu, Estonia
Mariana Maante-Kuljus: Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Fr. R. Kreutzwaldi 1, 51006 Tartu, Estonia
Alar Aluvee: Institute of Agricultural and Environmental Sciences, Polli Horticultural Research Centre, Uus 2, 69108 Polli, Estonia
Rajeev Bhat: ERA Chair for Food (By-) Products Valorisation Technologies (Valortech), Estonian University of Life Sciences, Fr. R. Kreutzwaldi 1a, 51014 Tartu, Estonia

Agriculture, 2020, vol. 10, issue 9, 1-9

Abstract: Grapevine leaves are a major by-product of viticulture practices derived from the leaf-removal from the fruit cluster zone in all vine growing regions. These leaves can be a valuable source of antioxidants to be used in pharmaceuticals or other health-related products. In this study, the leaves of grapevine cultivars were analysed by ultra-high performance liquid chromatograph-diode array detector () for the total polyphenols (TPC) and resveratrol affected by cultivar, leaf-removal time and viticultural practice. The effect of cultivar varied yearly, European grapevine cv. ‘Regent’ had increased TPC and resveratrol in comparison to ‘Boskoop’s Glory’, ‘Rondo’ and ‘Solaris’ in 2017, but ‘Solaris’ in 2018. TPC (1213–1841 mg 100 g −1 ) and resveratrol (1.061 mg 100 g −1 ) were higher in leaves of interspecific hybrid cvs. ‘Zilga’ and ‘Hasansky Sladky’ during full fruit ripeness. Cv. ‘Rondo’ grown under the polytunnel had decreased TPC in leaves. In conclusion, cultivar selection, viticultural practice and leaf-removal time contribute significantly to the accumulation of total polyphenols and resveratrol. Results of this study will contribute to better utilization of biomass produced in the vineyards, help to decrease the negative environmental impacts, and provide an overview on various factors affecting the biochemical constituents, especially in leaves.

Keywords: Vitis interspecific hybrids; grapevine leaves; by-products of grape; polyphenols (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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