Polyphenol content and antioxidant capacity of the skin extracts of berries from seven biotypes of the Greek grapevine cultivar Korinthiaki Staphis (Vitis vinifera L.)

Abstract

Τhe polyclonality of a grapevine cultivar plays a significant role in the quality of the viticultural products it yields, especially when age-old grapevine cultivars such as Korinthiaki Staphis are entailed. The aim of the present study was to determine the polyphenol content and antioxidant capacity of the berry skins of seven (7) biotypes-possibly clones of the grapevine cultivar Korinthiaki Staphis (Vitis vinifera L.). For the purposes of the present study, it is worth noting at this point that all seven biotypes had been cultivated in the same geographic location and under the same climate and soil conditions. In view of the study's aim, the biotypes were studied using high performance liquid chromatography (HPLC) coupled with a diode array detector and spectrophotometer. The results revealed that the levels of both polyphenol content and antioxidant capacity were high in all biotypes. Statistically significant differences between and among the biotypes were duly recorded: (a) Biotype KS15 exhibited a high concentration in total anthocyanins, total flavanols, total flavonoids, acidity, and total soluble solids; (b) biotype KS6 exhibited a high concentration in total soluble solids, total flavanols, epicatechin, procyanidins B1 and B2, trans-resveratrol, and piceid; and (c) biotype KS1 exhibited a high concentration in quercetin, rutin, catechin, epicatechin, trans-resveratrol, and piceid; and the highest concentration in the phenolic aldehyde vanillin. Both polyphenolic content and antioxidant capacity are biotype-dependent. Thus, when striving for products of exceptional quality it is crucial for viticulturists to exploit the appropriate biotypes of Korinthiaki Staphis. Research and results on the studied biotypes suggest that KS15, KS1, and KS6, individually or in combination, are the most suitable ones for the establishment of productive vineyards.

Comparative study of qualitative and quantitative characters of grape cultivar 'Mavrodafni' (Vitis vinifera L.) and 'Renio' grown in different regions of the Protected Designation of Origin Mavrodafni Patras

“…A total of three (3) replications per treatment (cultivar) took place. The sampling process and samples preparation for spectrophotometric and HPLC analyses, as well as the data analysis described in Stavrakaki et al (2018), were followed for the needs of this experiment. The various polyphenolic compounds analysed were identified according to their order of elution and the retention times of the pure compounds.…”

“…The various polyphenolic compounds analysed were identified according to their order of elution and the retention times of the pure compounds. The reagents and chemicals used were the same as in Biniari et al (2018).…”

“…'Renio' is considered either a biotype of Mavrodafni or an altogether different cultivar. A study that employed molecular markers showed that they are different cultivars (Stavrakaki and Biniari 2009). 'Renio' is less vigorous, less qualitative, but more productive compared to 'Mavrodafni' and does not require specific cultivation techniques.…”

Effect of the plot variability on the qualitative and quantitative characteristics of the berry's skins and seeds of grape cultivar Agiorgitiko (Vitis vinifera L.)

“…The expansion of the vineyards from higher, sloped landscapes (higher than 900 m) to new cultivation areas has resulted in the location of many newer planted vineyards at lower elevations and more fertile soils typically located between 750 and 800 m. The climatic conditions in these areas, as well as the productive potential of the soils, demand greater attention to vine management, including microclimatic aspects affecting health and maturation of grapes (Ramos et al 2015).…”

“…The process of acquiring and using data during the implementation of Precision Viticulture is constant and repetitive. Therefore, it is possible to determine the appropriate plots within a vineyard in order to obtain viticultural products of high quality through selective harvesting, based on zones of similar soil properties (Bramley andHamilton 2004, Bramley et al 2005).…”