4. Conclusion
Three craft durum wheat beers, produced in a micro-brewery
located in the south-east of Sardinia, were assessed during aging
to evaluate flavor stability with variations in yeasts, time, and
temperature.
Volatile compounds, analyzed by GCeMS, changed over a period
of six months with a decrease in esters and higher alcohols and an
increase in carbonyl compounds. This trend was more evident at
the higher temperature.
Storage time, temperature and yeast did not significantly influence
beers physicalechemical parameters. Only beer color was
significantly different between the two temperatures, increasing at
the higher temperature.
The sensory profiles showed a reduction in some attributes
related to flavor and in-mouth sensations during storage, confirming
data obtained by GCeMS. Despite the increase in carbonyl
compounds as revealed by GCeMS analysis, to the end of aging the
intensity of off-flavors did not exceed the value of 1 in the scale of
intensity from 0 to 10. No significant differences were observed ithe sensory profile between storage temperatures. Only a significant
difference for foam persistence was perceived with higher
values at higher temperature. Differences between yeasts at t0
were found only for fullness, being more intense in the autochthonous
yeasts S38 compared with the commercial one.
In conclusion, the three beers, two of which brewed with
sourdough yeasts, showed similar physical-chemical, volatile and
sensory characteristics during aging. This suggests the possible use
of autochthonous sourdough yeasts in brewing, providing an
additional element of authenticity to existing production in order
to create a stronger regional link, with positive economic returns.
As far as we know, here it is presented for the first time, the
aging behavior of craft durum wheat beers. Further studies could
focus on shelf life of beers over a longer period in order to improve
product stability and thus enhance the potential for expanding the
craft beer market outside of the local region. Finally more research
is necessary to enhance the knowledge about the sourdough yeasts
behavior in brewing technology to confer originality to the product
beer.
4. ConclusionThree craft durum wheat beers, produced in a micro-brewerylocated in the south-east of Sardinia, were assessed during agingto evaluate flavor stability with variations in yeasts, time, andtemperature.Volatile compounds, analyzed by GCeMS, changed over a periodof six months with a decrease in esters and higher alcohols and anincrease in carbonyl compounds. This trend was more evident atthe higher temperature.Storage time, temperature and yeast did not significantly influencebeers physicalechemical parameters. Only beer color wassignificantly different between the two temperatures, increasing atthe higher temperature.The sensory profiles showed a reduction in some attributesrelated to flavor and in-mouth sensations during storage, confirmingdata obtained by GCeMS. Despite the increase in carbonylcompounds as revealed by GCeMS analysis, to the end of aging theintensity of off-flavors did not exceed the value of 1 in the scale ofintensity from 0 to 10. No significant differences were observed ithe sensory profile between storage temperatures. Only a significantdifference for foam persistence was perceived with highervalues at higher temperature. Differences between yeasts at t0were found only for fullness, being more intense in the autochthonousyeasts S38 compared with the commercial one.In conclusion, the three beers, two of which brewed withsourdough yeasts, showed similar physical-chemical, volatile andsensory characteristics during aging. This suggests the possible useof autochthonous sourdough yeasts in brewing, providing anadditional element of authenticity to existing production in orderto create a stronger regional link, with positive economic returns.As far as we know, here it is presented for the first time, theaging behavior of craft durum wheat beers. Further studies couldfocus on shelf life of beers over a longer period in order to improveproduct stability and thus enhance the potential for expanding thecraft beer market outside of the local region. Finally more researchis necessary to enhance the knowledge about the sourdough yeastsbehavior in brewing technology to confer originality to the productbeer.
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