4. Conclusions
HIPEF-treated orange juice and gazpacho better
retained vitamin C than did thermally-treated products.
Vitamin C retention depended on the food and the process
parameters, such as electric field strength, treatment
time, pulse frequency, width and polarity. Bipolar pulses
led to higher contents of vitamin C and the lower the
electric field strength, the treatment time, the pulse frequency
and the pulse width, the higher was the vitamin
C retention. Greater levels of retention of vitamin C
were achieved in HIPEF-treated orange juice than in
HIPEF-treated gazpacho. HIPEF treatment did not affect
the antioxidant capacity of orange juice and gazpacho. A
pasteurization HIPEF treatment of 35 kV/cm for 1000 ls
at 200 Hz and bipolar pulses of 4 ls led to 90.8% and
86.8% vitamin C retentions, and 37.6% and 44.1% inhibition
of DPPH in orange juice and gazpacho, respectively.
Higher contents of vitamin C were not related to higher
levels of antioxidant capacity. The presence of other bioactive
compounds may contribute to antioxidant capacity
of orange juice and gazpacho. Further research is
required to elucidate the effects of HIPEF-process
parameters on the bioactive compounds of foods.
HIPEF-processing has good prospects for use in the food
industry as an alternative to thermal pasteurization, in
order to achieve healthy foods.
4. ConclusionsHIPEF-treated orange juice and gazpacho betterretained vitamin C than did thermally-treated products.Vitamin C retention depended on the food and the processparameters, such as electric field strength, treatmenttime, pulse frequency, width and polarity. Bipolar pulsesled to higher contents of vitamin C and the lower theelectric field strength, the treatment time, the pulse frequencyand the pulse width, the higher was the vitaminC retention. Greater levels of retention of vitamin Cwere achieved in HIPEF-treated orange juice than inHIPEF-treated gazpacho. HIPEF treatment did not affectthe antioxidant capacity of orange juice and gazpacho. Apasteurization HIPEF treatment of 35 kV/cm for 1000 lsat 200 Hz and bipolar pulses of 4 ls led to 90.8% and86.8% vitamin C retentions, and 37.6% and 44.1% inhibitionof DPPH in orange juice and gazpacho, respectively.Higher contents of vitamin C were not related to higherlevels of antioxidant capacity. The presence of other bioactivecompounds may contribute to antioxidant capacityof orange juice and gazpacho. Further research isrequired to elucidate the effects of HIPEF-processparameters on the bioactive compounds of foods.HIPEF-processing has good prospects for use in the foodindustry as an alternative to thermal pasteurization, inorder to achieve healthy foods.
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