Study on resveratrol content in grapes and wine products Petr E Balanov, Irina V Smotraeva, Malika S Abdullaeva, Daria A Volkova and Olga B Ivanchenko E3S Web Conf., 247 (2021) 01063 Published online: 05 April 2021 DOI: 10.1051/e3sconf/202124701063