Use of low-voltage direct current electricity treatment to increase phenolics content of postharvest okra: effects of some treatment parameters
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Publication Details
Author list: Saetung T., Devahastin S., Chiewchan N.
Publisher: Wiley
Publication year: 2018
Journal: International Journal of Food Science + Technology (0950-5423)
Volume number: 53
Issue number: 2
Start page: 441
End page: 448
Number of pages: 8
ISSN: 0950-5423
eISSN: 1365-2621
Languages: English-Great Britain (EN-GB)
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Abstract
Low-voltage direct current electricity was applied to increase phenolics content of postharvest okra (Abelmoschus esculentus L.) at different values of current (0.10–0.50 A) and application time (900–3600 s). Use of different electrolytes, namely tap water as well as 0.10- and 0.15-mol L−1 brine, was also investigated. Calcium-dependent protein kinase was quantified to indicate responses of okra to the treatment. Free and bound phenolics contents were measured and the results used to confirm whether the increased phenolics was due to the applied electricity; initial contents of total, bound and free phenolics were noted to be 6.19, 1.73 and 4.46 g kg−1, respectively. Total phenolics content (8.12–8.38 g kg−1) significantly increased when using a current of 0.30 A, application time of 900–3600 s, with brine as the electrolytes. Use of current of 0.30 A and 0.10-mol L−1 brine for 900 s is suggested as the appropriate treatment condition. © 2017 Institute of Food Science and Technology
Keywords
bound phenolics, calcium-dependent protein kinase, electrolytes, free phenolics, nonthermal processing
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