Fig. 2 indicates a positive influence of the pressure on the total anthocyanin
content. The highest anthocyanin content was observed at
the highest levels of both pressure and time (500 MPa/15 min) as
well as Stevia concentration (2.5%, w/v). This result indicates that in
this particular range of processing conditions the HPP mainly modifies
the mechanism of anthocyanin degradation by affecting the molecules
involved in the kinetics of reaction, such as enzymes. Barba
et al. (2011) and Ferrari, Maresca, and Ciccarone (2010) observed
similar results in HPP (200–600 MPa/15 min) blueberry juice and
HPP (400–600 MPa/5–10 min) pomegranate juice, respectively.
Total carotenoid (TC) content in the untreated beverage sweetened
with 0, 1.25 and 2.5% (w/v) were 329.3±14.1, 337.6±10.1,
and 324.4±7.1 μg/100 mL, respectively. The analysis of variance
showed that the regression model was accurate enough (R2=0.902,
pb0.05, standard error=18.905). The relationship between the independent
variables and total carotenoids can be described by the
Eq. (3):
Fig. 2 indicates a positive influence of the pressure on the total anthocyanincontent. The highest anthocyanin content was observed atthe highest levels of both pressure and time (500 MPa/15 min) aswell as Stevia concentration (2.5%, w/v). This result indicates that inthis particular range of processing conditions the HPP mainly modifiesthe mechanism of anthocyanin degradation by affecting the moleculesinvolved in the kinetics of reaction, such as enzymes. Barbaet al. (2011) and Ferrari, Maresca, and Ciccarone (2010) observedsimilar results in HPP (200–600 MPa/15 min) blueberry juice andHPP (400–600 MPa/5–10 min) pomegranate juice, respectively.Total carotenoid (TC) content in the untreated beverage sweetenedwith 0, 1.25 and 2.5% (w/v) were 329.3±14.1, 337.6±10.1,and 324.4±7.1 μg/100 mL, respectively. The analysis of varianceshowed that the regression model was accurate enough (R2=0.902,pb0.05, standard error=18.905). The relationship between the independentvariables and total carotenoids can be described by theEq. (3):
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