Abstract: The present invention relates to a process to produce a wine or fruit juice stabiliser comprising contacting a composition comprising proteinaceous material with a prolyl-specific protease, as well as to a wine or fruit juice stabiliser obtainable by said process. The invention also relates to a composition comprising peptides, said peptides having a molar fraction (%) of peptides carrying a carboxy terminal prolyl residue of at least 0.25%. Said wine or fruit juice stabiliser or composition may be used as a stabiliser against the crystallisation of KHT or other organic acids without causing protein haze.

Abstract: The present invention describes a composition suitable for use in wine comprising at least 2.5% of a peptide mixture based on dry weight characterized in that the peptides have a molecular weight between 3 kDa and 10 kDa. The composition or a solution thereof can be advantageously used to stabilise wine, in particular to prevent or retard the formation of tartrate salts in the wine.

Abstract: The present invention describes a mannoprotein solution which has a turbidity, when measured by nephelometry at a concentration of 200 g/l of mannoprotein and at a pH in the range of pH 4 to pH 8 lower than 70 NTU, preferably lower than 60 NTU, more preferably lower than 50 NTU, most preferably lower than 40 NTU. This solution can be advantageously used in the stabilisation of wine against tartrate salt precipitation because it is very clear and can be added directly to the wine without causing any turbidity.

Abstract: The present invention describes a process to improve the activity as wine stabiliser of a mannoprotein, comprising treating a mannoprotein with a basic solution at a pH of at least 9. The mannoprotein obtainable by this process is more effective in stabilising wine against tartrate precipitation or protein haze formation when compared with the mannoprotein prior to the treatment with basic solution.