Chemodiversity evaluation of grape (Vitis vinifera) vegetative parts during summer and early fall

Characterization of an Antioxidant-Enriched Beverage from Grape Musts and Extracts of Winery and Grapevine By-Products

“…However, these compounds were also detected in pomace and leaves ( Table 1). The presence of these compounds was in agreement with previous reports identifying caftaric acid, epicatechin, and quercetin and malvidin derivatives as the main metabolites concerning grape stems [40,41]. Although the presence of stilbenes in grape canes has been reported previously [42][43][44], these compounds were not detected in this study.…”

Development of an Artificial Neural Network as a Tool for Predicting the Targeted Phenolic Profile of Grapevine (Vitis vinifera) Foliar Wastes

“…Based on ours and other published works ( Houillé et al, 2015 ; Torres et al, 2015 ; Eftekhari et al, 2017 ), it has been shown that the vegetative parts of grapevines, which are often waste-products in grape cultivation and production, are rich in phenolics. Their phenolic composition is determined primarily by genetic factors and the identity of the organ (leaf or stem) ( Eftekhari et al, 2017 ), and it may change during the vine development ( Teixeira et al, 2013 ; Eftekhari et al, 2017 ). Meanwhile, the influence of additional factors remains unknown, as does prediction of the phenolics profile in different organs in various time points through the vine annual growth cycle.…”

“…In a previous study ( Eftekhari et al, 2017 ), we collected leaves and stems from 5-year-old vines of 70 Iranian native grape cultivars [Supplementary Table S1 in supplementary material of Eftekhari et al (2017) ] growing in the Research Farm of Faculty of Agriculture, University of Tehran, Karaj, Alborz, Iran (latitude 35° 50′ N, longitude 50° 58′ E and altitude 132 m) at the middle of 4 months of July to October 2015. Collected samples were extracted after oven-drying at 40°C for 72 h, using the method described by Eftekhari et al (2012) .…”

“…Grapevine ( Vitis vinifera ) as one of the most economically important fruit crops worldwide, has been extensively cultivated all over the world for fresh consumption as well as industrial processing. Both cultivation and industrial processing of grapes lead to byproducts, such as leaves and stems which have been found as the enriched resources of bioactive polyphenolic compounds ( Eftekhari et al, 2017 ). The phenolics worth is due to their important roles in protection against degenerative diseases such as cancer and atherosclerosis, in addition to antimicrobial, anti-inflammatory, antidiabetic and skin protection, hepatoprotective, and neuroprotective activities ( Nassiri-Asl and Hosseinzadeh, 2016 ).…”

“…The data were obtained from HPLC for individual phenolics and spectrophotometry for TRC, TFC, and TAA. The total measurements reflected the phenolic properties of the sample; but if they have a direct relationship with individual phenolics is still a question which have been analyzed only with correlation analysis in the literature ( Karacabey et al, 2012 ; Eftekhari et al, 2017 ). By training the network with specified inputs and outputs, we predict the targeted phenolics content of grape cultivars foliar parts.…”