abstract
A novel approach is described using chitosan-genipin films as a sustainable method for wine preservation. Films prepared from fungi and from shrimp by-products showed similar mechanical and chemical properties. In addition, shrimp derived films showed no IgE positive reaction against shellfish allergenic compounds. The chitosan-genipin films were used to produce white wines without the addition of sulphur dioxide as a preservative. These wines showed lower susceptibility to browning, with organoleptic characteristics comparable to those prepared using sulphur dioxide. It is shown that the formation of iron-tartrate-chitosan complexes promotes the decrease of iron and other metal availability, minimizing oxidation reactions, as well as inhibiting microbial growth. The overall volatile character of the wines was maintained. However, the presence of chitosan-genipin films promotes the occurrence of Maillard and Strecker reactions, producing volatile compounds with positive wine aroma scents. The use of chitosan-genipin films in winemaking is an innovative, green and environmentally friendly technology that could be easily implemented at an industrial scale with no additional costs.
keywords
CROSS-LINKING; ANTIOXIDANT ACTIVITY; VOLATILE COMPOSITION; STRUCTURAL-ANALYSIS; MASS-SPECTROMETRY; GRAPE POMACE; RED WINE; CHITIN; HYDROGELS; ACID
subject category
Chemistry; Science & Technology - Other Topics
authors
Nunes, C; Maricato, E; Cunha, A; Rocha, MAM; Santos, S; Ferreira, P; Silva, MA; Rodrigues, A; Amado, O; Coimbra, J; Silva, D; Moreira, A; Mendo, S; da Silva, JAL; Pereira, E; Rocha, SM; Coimbra, MA
our authors
Cláudia Nunes
Assistant Researcher
Paula Celeste da Silva Ferreira
Coordinating ResearcherGroups
G2 - Photonic, Electronic and Magnetic Materials
G4 - Renewable Materials and Circular Economy
acknowledgements
Thanks are due to FCT/MEC for the financial support to the QOPNA research Unit (FCT UID/QUI/00062/2013) and CICECO-Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (Ref. FCT UID/CTM/50011/2013), through national funds and where applicable co-financed by the FEDER, within the PT2020 Partnership Agreement. Also, to the financial support of the projects: QREN no. 3462, and FCT (PTDC/AGR-ALI/101251/2008). C. Nunes thanks FCT for the post-doc grants (SFRH/BPD/46584/2008; SFRH/BPD/100627/2014), M. A. M. Rocha for the PhD grant (SFRH/BD/98015/2013) and P. Ferreira for the IF grant (IF/00327/2013). Thanks are also due to Dr Marilia Beltrao, Faculdade de Medicina da Universidade do Porto, Portugal, for the tropomyosin detection analysis of chitosan performed.