Journal
FOOD CHEMISTRY
Volume 102, Issue 1, Pages 201-209Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2006.04.048
Keywords
high intensity pulsed electric fields; orange juice; gazpacho vitamin C; antioxidant capacity
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Orange juice and gazpacho, a cold vegetable soup, were submitted to high intensity pulsed electric fields (HIPEF). The effects of electric field strength, treatment time, pulse frequency, width and polarity, as process parameters, on vitamin C retention and antioxidant capacity of both products were evaluated and compared to those in a heat pasteurization. Vitamin C was determined by HPLC and antioxidant capacity through the inhibition of the DPPH. (1,1-diphenyl-2-picrylhydrazyl) radical. Orange juice and gazpacho retained a 87.5-98.2% and 84.3-97.1% of vitamin C, respectively, after HIPEF treatments. Pulses applied in bipolar mode, as well as a lower electric field strength, treatment time, pulse frequency and width, led to higher levels of vitamin C retention (p < 0.05). HIPEF-treated orange juice and gazpacho always showed a vitamin C retention higher than that of the heat-pasteurized products. There were no differences (p < 0.05) in antioxidant capacity between HIPEF-treated and untreated products, whereas heat-treated foods showed lower values of antioxidant capacity. (c) 2006 Elsevier Ltd. All rights reserved.
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