Abstract: The present invention relates to a winemaking process using the traditional method of vinification except that, after fermentation, a chitosan-based film is placed in contact with the wine and no sulfur dioxide is added. The present invention also relates to a process for preparation of a chitosan-based film by modification of the chitosan with natural compounds, which allows to produce chitosan films stable in acidic medium, with high antioxidant activity, while maintaining the antimicrobial activity. In one embodiment, the films are prepared by covalent linkage to the chitosan of molecules, such as genipin, which results in decreasing its solubility in acidic medium, and also of molecules with high antioxidant activity, such as caffeic acid, or grape and wine extracts rich in compounds with antioxidant activity.

Abstract: The present invention provides a process for detecting Helicobacter pylori using aliphatic amides in which the referred amides are converted into their corresponding acids, when in contact with the bacterium. These acids are volatile or semi-volatile compounds and can be detected in the vapor phase by means of common chromatography techniques. Propionamide or butyramide can be used as amides, forming, respectively, the propionic and butyric acids. Any other non-toxic aliphatic amide can be used. The amides in use can be orally administrated as pills or as a diluted aqueous solution by both genders, any race and age, independently of the coexistence of pathologies associated or not with this bacterium. The invention is used in the development of a new non-invasive process for the detection of H. pylori in the stomach by means of analyzing exhaled air, and can be implemented in the medical and pharmaceutical industry.