| Autor: |
Molitor RW; Oregon State University, 100 Wiegand Hall, 3051 SW Campus Way, Corvallis, Oregon 97731, United States., Fischborn T; Lallemand Incorporated, Brewing, 6100 Royalmount Avenue, Montreal, Quebec H4P2R2, Canada., Dagan L; Nyséos, 53 rue Claude Francois, Parc 2000, Montpellier 34080, France., Shellhammer TH; Oregon State University, 100 Wiegand Hall, 3051 SW Campus Way, Corvallis, Oregon 97731, United States. |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of agricultural and food chemistry [J Agric Food Chem] 2023 Feb 08; Vol. 71 (5), pp. 2493-2502. Date of Electronic Publication: 2023 Jan 24. |
| DOI: |
10.1021/acs.jafc.2c06966 |
| Abstrakt: |
In Saccharomyces , the IRC7 gene encodes for a cysteine S-conjugate β-lyase enzyme which can release polyfunctional thiols from their cysteinylated precursor forms, thereby promoting thiol aroma in beer. This study examined the thiol production of 10 commercial yeast strains in two different media, a hopped yeast extract-peptone-dextrose (YPD) medium and a 100% barley malt wort to explore how differences in yeast strain and medium conditions influence the release of polyfunctional thiols. 3-Sulfanylhexan-1-ol was most affected by medium conditions, and its concentrations were highest in wort fermentations. The higher nitrogen content and pH of the YPD medium relative to the wort fermentations were notable differences, and significant correlations between these variables and the extent of free thiol production were observed. A strong association existed between polyfunctional thiol concentrations and the fermentation-derived, malt, and hop-derived compounds 2-phenylethanol, β-damascenone, and β-ionone. The sensory impressions of thiol character in beer were influenced by the presence of other aromatic compounds such as esters and terpene alcohols, and aroma attributes such as "tropical" were not the most suitable for describing beers brewed with yeasts that fully express homozygous IRC7 F . Sensory attributes "sweaty", "vegetal", and "overripe fruit" were more strongly associated with these strains. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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