3. Results and discussion
Physical-chemical parameters of the three craft durum wheat
beers at t0, one brewed with commercial yeast (S33) and two with
autochthonous yeasts isolated from sourdough (S42, S38), used
here for the first time, were reported in Table 2. As can be seen the
fermentation occurred to a greater extent in the beer fermented
with the autochthonous yeast S38 that showed the lowest value for
apparent extract.
In order to highlight the sensory differences among these beers
a One-way ANOVA was applied at t0 (Fig. 1). No significant differences
were found among the beers for all the sensory attributes
except fullness, which was higher in S42 beer (autochthonous
yeast) compared with S33 beer (commercial yeast) and S38 beer
(autochthonous yeast), (F ¼ 12.50, p < 0.05). It was observed a
tendency for yeast S38 to be more fruity that the others, but this
difference at t0 was not significant.
To explore data obtained a PCA analysis of the three beers, on
physico-chemical and sensory variables and volatile compounds, at
three different storage times (t0, t1 and t2) and at two temperatures
(L and H) was carried out (Fig. 2a and b). Examining the score
plot (Fig. 2a), the influence of storage time is clear, with a distinction
between t0 and t1 and between t0 and t2, with a less marked
distinction between t1 and t2, as expected. PC1 was responsible for
the distinction between t0 and the other two storage times with an
explained variance of 48%, while that between t1 and t2 occurs
along both the first and the second components. Moreover, it
cannot be observed a clear distinction between samples stored at
two different temperatures for t1 and t2 storage times, even if a
more evident separation between samples was found at t2. At t0,
3. Results and discussionPhysical-chemical parameters of the three craft durum wheatbeers at t0, one brewed with commercial yeast (S33) and two withautochthonous yeasts isolated from sourdough (S42, S38), usedhere for the first time, were reported in Table 2. As can be seen thefermentation occurred to a greater extent in the beer fermentedwith the autochthonous yeast S38 that showed the lowest value forapparent extract.In order to highlight the sensory differences among these beersa One-way ANOVA was applied at t0 (Fig. 1). No significant differenceswere found among the beers for all the sensory attributesexcept fullness, which was higher in S42 beer (autochthonousyeast) compared with S33 beer (commercial yeast) and S38 beer(autochthonous yeast), (F ¼ 12.50, p < 0.05). It was observed atendency for yeast S38 to be more fruity that the others, but thisdifference at t0 was not significant.To explore data obtained a PCA analysis of the three beers, onphysico-chemical and sensory variables and volatile compounds, atthree different storage times (t0, t1 and t2) and at two temperatures(L and H) was carried out (Fig. 2a and b). Examining the scoreplot (Fig. 2a), the influence of storage time is clear, with a distinctionbetween t0 and t1 and between t0 and t2, with a less markeddistinction between t1 and t2, as expected. PC1 was responsible forthe distinction between t0 and the other two storage times with anexplained variance of 48%, while that between t1 and t2 occursalong both the first and the second components. Moreover, itcannot be observed a clear distinction between samples stored attwo different temperatures for t1 and t2 storage times, even if amore evident separation between samples was found at t2. At t0,
การแปล กรุณารอสักครู่..
