Polyphenols are an important constituent of wines and they are largely studied due to their antioxidant properties and for their effects on wine quality and stability, which is also related to their capacity to bind to proteins. The effects of some selected polyphenols, including procyanidins B1 and B2, tannic acid, quercetin, and rutin, as well as those of a total white wine procyanidin extract on the conformational properties of the major wine protein VVTL1 (Vitis vinifera Thaumatin-Like-1) were investigated by Synchrotron Radiation Circular Dichroism (SRCD). Results showed that VVTL1 interacts with polyphenols as demonstrated by the changes in the secondary (far-UV) and tertiary (near-UV) structures, which were differently affected by different polyphenols. Additionally, polyphenols modified the two melting temperatures (T_M) that were found for VVTL1 (32.2 °C and 53.9 °C for the protein alone). The circular dichroism (CD) spectra in the near-UV region revealed an involvement of the aromatic side-chains of the protein in the interaction with phenolics. The data demonstrate the existence of an interaction between polyphenols and VVTL1, which results in modification of its thermal and UV denaturation pattern. This information can be useful in understanding the behavior of wine proteins in presence of polyphenols, thus giving new insights on the phenomena that are involved in wine stability.

Beside the well-known fungal pathologies, grapevine virus diseases are of major importance in grapegrowing areas, also due to the limited knowledge by the professionals of the sector. To face this problem, the PAThOGEN training program was developed, with the aims of: (i) building a high-quality Vocational and Education Training program, (ii) improving the skills of the main actors of the wine sector. The pilot courses were developed in two levels (Basic and Advanced) and made available on a dedicated online platform in 4 languages (French, Italian, Spanish and English). Moreover, two field sessions were organized in each of the 3 partner countries in order to complete the theoretical training. A specific feature of this project was the “demand driven approach” used to conceive the courses. Indeed, a panel of experts and 128 “student-testers” were selected in the 3 countries in the different professional categories to test the training program. 98% of the testers evaluated the training course as “interesting” or “very interesting”. The detailed evaluations allowed us to rework the courses both in terms of content and functionality. The elearning training is now available in the four languages, and the field training is annually organized in France, Italy and Spain.