Low-temperature brewing using yeast immobilized on dried figs

A Bekatorou, A Sarellas, Nigel Ternan, A Mallouchos, M Komaitis, AA Koutinas, M Kanellaki

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Dried figs, following exhaustive extraction of their residual sugars with water, were used for immobilization of Saccharomyces cerevisiae AXAZ-1. The immobilized biocatalyst was used in repeated batch fermentations of glucose at 30 degreesC, where significant reduction of the fermentation time was observed, falling from 65 h in the first batch to 7 h after the sixth batch. Repeated fermentations of wort at room and low temperatures resulted in fermentation times that fell from 26 to 20 h and from 27 to 24 days at 18 and 3 degreesC, respectively. Ethanol and beer productivities were high, showing suitability of the biocatalyst for low-temperature brewing. Diacetyl concentrations were low (0.3-0.5 mg/L), and polyphenols were lower than in commercial products and decreased as the fermentation temperature was decreased (126-50 mg/L). Ethyl acetate concentrations increased from 53 to 88 mg/L as the temperature was decreased, while the concentration of amyl alcohols at 3 degreesC (58 mg/L) was lower than half of that at 18 degreesC (125 mg/L). The beers produced at the end of the main fermentation had a fine clarity and a special fruity figlike aroma and taste, distinct from commercial products and more intense than beers produced by cells immobilized on other food-grade supports (gluten pellets or delignified cellulosic materials). GC-MS analysis did not show significant differences in the qualitative composition of the aroma compounds of the beers produced by immobilized and free cells.
Original languageEnglish
Pages (from-to)7249-7257
JournalJournal of Agricultural and Food Chemistry
Issue number25
Publication statusPublished - Dec 2002

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    Bekatorou, A., Sarellas, A., Ternan, N., Mallouchos, A., Komaitis, M., Koutinas, AA., & Kanellaki, M. (2002). Low-temperature brewing using yeast immobilized on dried figs. Journal of Agricultural and Food Chemistry, 50(25), 7249-7257. https://doi.org/10.1021/jf020291q