the highest volume of the juice was taken into consideration
as a reference. Therefore, for orange-white grape juice blends,
Tref, D and z values were chosen according to orange juice. For
apple-white grape juice blends, the parameters for apple juice
are chosen but due to temperature increases within a shorter
time than apple juice in the preliminary experiments,Tref was
chosen as 90 °C, otherwise 80 °C for other CJDs (Table 1). The
pasteurization parameters for each CJD productions are given
in Table 3.
The pasteurization processes were carried out at 95 °C.The
initial cold point temperatures of the preheated drinks were
changed to between 59.1 and 64.6 °C. The come up time was
changed to between 9 and 13 min where the processing time
was 18 to 32 min and cooling time was 14 to 17 min.When the
target P value was reached, the cooling process was started.
To ensure microbiological safety under commercial processing
conditions, the experimental P values were kept higher than
the target ones.
The initial microbial populations are shown in Table 4. The
counts of the microbial populations for TVC andYMC were low
initially and were approximately 101 CFU/g due to the use of
commercial pasteurized fruit juices. E. coli O157:H7 was not determined
before pasteurization.
The CJD were incubated at 30 °C for 10 days after pasteurization
and no growth was determined in any of the juices.The
pasteurization process was found adequate to inactivate the
total microbial load in the CJD which resulted in an acceptable
microbiological product quality.
the highest volume of the juice was taken into considerationas a reference. Therefore, for orange-white grape juice blends,Tref, D and z values were chosen according to orange juice. Forapple-white grape juice blends, the parameters for apple juiceare chosen but due to temperature increases within a shortertime than apple juice in the preliminary experiments,Tref waschosen as 90 °C, otherwise 80 °C for other CJDs (Table 1). Thepasteurization parameters for each CJD productions are givenin Table 3.The pasteurization processes were carried out at 95 °C.Theinitial cold point temperatures of the preheated drinks werechanged to between 59.1 and 64.6 °C. The come up time waschanged to between 9 and 13 min where the processing timewas 18 to 32 min and cooling time was 14 to 17 min.When thetarget P value was reached, the cooling process was started.To ensure microbiological safety under commercial processingconditions, the experimental P values were kept higher thanthe target ones.The initial microbial populations are shown in Table 4. Thecounts of the microbial populations for TVC andYMC were lowinitially and were approximately 101 CFU/g due to the use ofcommercial pasteurized fruit juices. E. coli O157:H7 was not determinedbefore pasteurization.The CJD were incubated at 30 °C for 10 days after pasteurizationand no growth was determined in any of the juices.Thepasteurization process was found adequate to inactivate thetotal microbial load in the CJD which resulted in an acceptablemicrobiological product quality.
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