کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4564290 | 1330933 | 2010 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Freeze-dried wheat supported biocatalyst for low temperature wine making Freeze-dried wheat supported biocatalyst for low temperature wine making](/preview/png/4564290.png)
A new biocatalyst was prepared by immobilization of Saccharomyces cerevisiae AXAZ-1 yeast cells on whole wheat grains. This biocatalyst was subjected to freeze-drying and the effects of several protective agents and storage at 5 °C on viability and fermentative activity of yeasts cells were studied. Glycerol was the best protective agent that preserved the viability of immobilized yeast cells even after 9 month storage. After freeze-drying the biocatalyst was used for repeated batch wine making at extremely low temperatures until 5 °C. The produced wines were analyzed for volatile byproducts by GC and GC/MS and the results showed that the freeze-dried immobilized biocatalysts, with glycerol as protectant, produced wines with higher formation of esters than free cells, having at least similar aromatic profile to those produced by wet biocatalysts.
Journal: LWT - Food Science and Technology - Volume 43, Issue 10, December 2010, Pages 1485–1493