Grapes from the geographical areas of the Black Sea: Agroclimatic growing conditions and evaluation of stable isotopes compositions in scientific study
1 Research Laboratory of Food Quality & Technology (PNIL), RUDN University, 117198 Moscow, Russian Federation
2 National Research Institute of Viticulture and Winemarking « Magarach», 298600 Yalta, Crimea Republic
The report considers the agroclimatic conditions in the Black Sea districts of cultivation and processing of grapes - the Black Sea Lowland, the Crimean Peninsula and the South-west coastal areas of the Greater Caucasus. The IRMS/SIRA techniques - Flash combustion (FC-IRMS/SIRA) & Isotopic equilibration (EQ-IRMS/SIRA) - were first applied for the evaluation of carbon and oxygen isotopes ratios in the components of grapes from the Crimean Peninsula. The 13C/12C ratios were studied by the FC-IRMS/SIRA in carbohydrates and organic acids in authentic samples of 8 grape varieties from the 2015 harvest. The EQ-IRMS/SIRA was applied to measure the 18O/16O ratios in intracellular water of grapes. The measured δ13CVPDB value ranges from − 25.01 to − 21.01‰ (for carbohydrates), and from − 25.09 to − 21.30‰ (for organic acids). To evaluate the extent of biological isotope fractionation the 18O/16O ratios were measured in ground water and water of atmospheric precipitates from the Crimean Peninsula. Compared to ground (δ18OVSMOW from − 10.85 to − 8.14‰) and atmospheric (average δ18OVSMOW− 2.85‰) waters, the intracellular water of Crimean grape varieties is found to be enriched with 18O isotope. The δ18OVSMOW value of the grape intracellular water varies from 2.34 to 5.29‰ according to agroclimatic conditions of the season in 2015.
© The Authors, published by EDP Sciences 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).