Polyphenolic profile and stilbene content of Albanian “Kallmet” monovarietal wine

Abstract

Aim: The aim of this work was to characterize the phenolic content of wines from the most promising autochthonous red grape variety in Albania, the Kallmet.Methods and results: To make this first survey, 16 commercial monovarietal Kallmet wines were analyzed with special attention to proanthocyanidin (condensed tannins), anthocyanin and stilbene composition. The average content of total proanthocyanidins in these wines was 3877 mgL-1 and the anthocyanin content averaged 242 mgL-1. The mean degree of polymerization (mDP) varied from 8 subunits in young wine to 31 subunits in 6-year-old wine, with a mean value of 14.5 subunits. The total free anthocyanin content ranged from 85 mgL-1 in old wine to 609 mgL-1 in young wine, with a mean value of 242.5 mgL-1. Trans-piceid was the most abundant stilbene (11 mgL-1), followed by trans-resveratrol (1.8 mgL-1). It was evidenced that cis-forms of resveratrol and piceid presented a lower content than their trans-forms. The ratio between piceid (glycoside form) and resveratrol (aglycone form) was 8.2, showing a similar stilbene pattern as in Mediterranean wines.Conclusions: Kallmet wines show proanthocyanidin polymerization characteristics and stilbene profiles very similar to red wines deriving from other varieties grown under warm climates.Significance and impact of the study: In spite of the strong interest in Kallmet grape, there is still a need for detailed studies to know the range of the different components of interest found in the produced wine.

Polyphenols, biogenic amines and amino acids patterns in Verdelho wines according to vintage

“…In addition, in Verdelho wines independently of vintage no cis-or trans-resveratrol was detected. The stilbenes content depends on several parameters, namely grape variety, climate conditions, among others [30]. The results obtained are in agreement with the literature in which the levels of cis-piceid were lower than their trans-forms in most wines analyzed, except in Verdelho wine 2015 [29,30].…”

“…The stilbenes content depends on several parameters, namely grape variety, climate conditions, among others [30]. The results obtained are in agreement with the literature in which the levels of cis-piceid were lower than their trans-forms in most wines analyzed, except in Verdelho wine 2015 [29,30]. The ratio of trans-/cis-piceid was 4.83 and 1.06, for Verdelho 2013 and 2014, respectively.…”

Targeted analysis for the detection of phenolics and authentication of Albanian wines using LC-DAD/ESI–MS/MS combined with chemometric tools

“…In recent years, olive oil and wine production have grown significantly, contributing to the country's sustainable development [ 27 , 29 ]. The country boasts unique grape varieties, including Kallmet, Shesh i zi (ShiZ), and Shesh i bardhë (ShiB), which have been cultivated for a long time and are the most important in terms of the planted area [ [30] , [31] , [32] ]. The Shesh i zi grape cultivar is known for its elegant and aromatic qualities, while Kallmet is renowned for its bold and robust flavor.…”

Changes in potato cultivation technology in Korça region as adaptation to climate change

“…The climatic features of different areas are studied and expressed by climatic classifications (Climate Alterations of Albanian Territory, IHM, 1978), but in the case of agricultural plants the climatic environment should be characterised by the agro-climate classification of the areas, being within the same different plant areas react in different forms. The agro-climate classification of different agricultural areas enables the agro-climatic regionisation of the territory (Peçuli and Kopali, 2007), which allows the construction of suitable technologies and plant selection in accordance with their characteristics.…”

“…The purpose of this study was to analyse the climatic performance of the Korça area, referring to the main indicators and their Plant yield in agro-ecosystems varies from one year to the other; however the cultivation techniques are the same. From this point of view we say that this variability comes as a result of the direct or indirect impact of climatic factors that are not depend the human being (Peçuli and Kopali, 2007).…”