The global count of aerobic heterotrophic mesophyllic microorganisms
and molds and yeasts was evaluated for fresh and aged
CW samples in which the values reduced as a function of ageing
time. This result is a direct indication that the standard growth
curve of microorganisms in closed systems will only increase while
nutrients are available in the environment that can be appropriated.
In this case, CW obtained directly from fruits did not show
any kind of microbial growth (Piló et al., 2009), thus suggesting
that the counts obtained are probably due to contamination from
other sources. However, the low pH and the high sugar concentrations
in CW of good quality are factors that easily promote the
development of yeasts in these beverages. Additionally, the
numbers of aerobic heterotrophic mesophyllic microorganisms
and molds and yeasts in CW obtained were similar to those
reported in the literature (Piló et al., 2009).
Although the results showed microbial growth in CW decreased
over time, other authors have reported that the total aerobic
counts in untreated CW increased after 6 weeks of storage, and
that molds and yeasts showed no growth in the total period of
9 weeks of investigation (Damar, Balaban, & Sims, 2009). The
decreasing microbial growth observed from the third to fifteenth
days is due to an inverse tendency for the TA values, which means
an acid accumulation medium that becomes unsuitable for
microbial growth. Besides, the sugar concentration decreases as a
function of storage time.
The global count of aerobic heterotrophic mesophyllic microorganismsand molds and yeasts was evaluated for fresh and agedCW samples in which the values reduced as a function of ageingtime. This result is a direct indication that the standard growthcurve of microorganisms in closed systems will only increase whilenutrients are available in the environment that can be appropriated.In this case, CW obtained directly from fruits did not showany kind of microbial growth (Piló et al., 2009), thus suggestingthat the counts obtained are probably due to contamination fromother sources. However, the low pH and the high sugar concentrationsin CW of good quality are factors that easily promote thedevelopment of yeasts in these beverages. Additionally, thenumbers of aerobic heterotrophic mesophyllic microorganismsand molds and yeasts in CW obtained were similar to thosereported in the literature (Piló et al., 2009).Although the results showed microbial growth in CW decreasedover time, other authors have reported that the total aerobiccounts in untreated CW increased after 6 weeks of storage, andthat molds and yeasts showed no growth in the total period of9 weeks of investigation (Damar, Balaban, & Sims, 2009). Thedecreasing microbial growth observed from the third to fifteenthdays is due to an inverse tendency for the TA values, which meansan acid accumulation medium that becomes unsuitable formicrobial growth. Besides, the sugar concentration decreases as afunction of storage time.
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