By Pascal Ribéreau-Gayon, Denis Dubourdieu, Y. Glories, A. Maujean
The guide of Enology quantity 2: The Chemistry of Wine Stabilization and Treatments uniquely combines chemical thought with the descriptions of day by day paintings within the latter phases of winemaking from rationalization and stabilization remedies to getting old strategies in vats and barrels.
The specialist authors speak about:
* Compounds in wine, reminiscent of natural acids, carbohydrates, and alcohol.
* Stabilization and coverings
* The chemical methods taking impression in bottled wine
The info supplied is helping to accomplish larger ends up in winemaking, supplying an authoritative and whole reference guide for either the winemaker and the coed.
Read Online or Download Handbook of Enology, Volume 2: The Chemistry of Wine: Stabilization and Treatments (2nd Edition) PDF
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Extra resources for Handbook of Enology, Volume 2: The Chemistry of Wine: Stabilization and Treatments (2nd Edition)
The effectiveness of the three processes described above is generally satisfactory, although results depend on the type of wine (white or red), its alcohol content and any previous treatment or ﬁning. It is true that, in contact treatments involving large-scale seeding, the wine’s background is less important. Indeed, enologists do not always have this information if the wine has been purchased from another winery. In any event, wine must be well prepared and, above all, properly clariﬁed, to ensure the effectiveness of rapid artiﬁcial cold stabilization treatments.
1986). They showed that the smallest particle size after treatment (<50 µm) was larger than the initial size in the commercial product. Of course, recycling is not possible when red wines are treated, as the crystals become coated with phenols and coloring matter and rapidly lose their effectiveness. 17 is a continuous Organic Acids in Wine 39 10 4 5 2 3 8 6 9 1 7 Fig. 17. e. the treatment time, is deﬁned by the throughput in relation to the volume of the crystallizer. Thus, for example, if the throughput is 60 hl/h and the volume of the crystallizer is 90 hl, the average time the wine spends in the system is 1 h 30 min.
1997) from the same mannoprotein preparations, obtained by the enzymic treatment of yeast walls. Furthermore, it has been demonstrated that these mannoproteins share covalent bonds with glucane (Moine-Ledoux and Dubourdieu, 1999). 21), which do not affect osidic bonds. The presence of peak 2, corresponding to elution of the mannoprotein responsible for tartrate stabilization, conﬁrms that the bond is covalent. Some of the mannoproteins that share covalent bonds with glucane also have a special type of glycosylation, leading to a glycosyl-phosphatidylinositol (GPI).