Wines & Vines

May 2014 Packaging Issue

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p r a c t i c a l w i n e r y & v i n e ya r d M ay 2 0 1 4 87 w i n e M a K i n g NOW IN STOCK Mueller® Wine Barrels Our premiere stainless steel wine barrels are in stock for immediate shipment. 1-800-MUELLER • sales@paulmueller.com ©2014 Paul Mueller Company 380-10 Buy online today at shop.paulmueller.com! Ad380-10_MuellerQtrPgBW_Layout 1 3/13/14 3:59 PM Page 1 multivariate statistics we found that the increase in H 2 S concentration was due to the specific metal combinations: Zn, Al, Zn*Al or Mn*Zn*Al and was not influ- enced by copper or iron. Similarly, three examples of metal treat- ments associated with some of the largest increases in MeSH concentration in the Shiraz samples are shown in Figure 1. The increased MeSH concentrations in s a m p l e s w i t h a d d e d C u * M n * Z n , Cu*Zn*Al and copper were found to be driven by the significant effect of copper and not through the interaction with the other metals. Overall, fewer metals produced signifi- cant effects on DMS evolution, and the effect of the metal treatments was mostly associated with an overall decrease in DMS concentration. The only metal treatments associated with significant effects on DMS concen- tration in both Chardonnay and Shiraz samples were Al and Zn*Al. The effects of these metals in decreasing the DMS concentration could possibly be due to the metals inhibiting the formation of DMS from its precursor molecules already present in the wine, or due to the catalytic degradation of DMS. Figure 4. Typical chromatograms for the analysis of H 2 S and MeSH in Shiraz wine samples with added copper, iron and the metal combination Cu*Fe are shown here at day 1 (left) and at month 12 (right). The metals copper, iron and Cu*Fe were associated with significant decreases in H 2 S concentration at day 1, but after 12 months of anaerobic storage copper and Cu*Fe were associated with significant increases in H 2 S and MeSH concentrations. Daily wine industry news winesandvines.com

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