THE EFFECT OF HIGH INTENSITY ULTRASOUND PRE-TREATMENT ON THE FUNCTIONAL PROPERTIES OF MICROWAVE-DRIED PEARS
DOI:
https://doi.org/10.52292/j.laar.2021.627Keywords:
Antioxidant capacity, high intensity ultrasound pre-treatment, microwave drying, pear fruit, total phenolic contentAbstract
The objective of this study was to investigate the impacts of high intensity ultrasound (HIU) pre-treatment on the quality of microwave-dried pears. Functional properties including color and bioactive compounds (total phenolic content (TPC) and antioxidant capacity (ATC)) of microwave-dried pears at 2 power levels (100 and 200 W) with and without HIU-pretreatment were compared with the untreated pears. A Konica Minota CR-400 Chroma Meter was used to examine the color changes in microwave-dried pears. TPC was measured using the Folin-Ciocalteu reagent. The free radical scavenging activity of the extract was analyzed using 1,1-dipheyl-2-picylhydrazyl (DPPH). It was concluded that the TPC and ATC of microwave-dried pears treated with and without HIU pre-treatment under both power levels were decreased in comparison with untreated pears. The highest phenolic substances were observed in a HIU pre-treated (20 min) and dried at 200 W pear pieces. Similarly, the ATC of microwave-dried pears at 200 W with HIU pre-treatment were higher than those of the samples processed with microwave drying at 100 W for both HIU-treated and untreated samples. All colour parameters (L*, a*, b*)were shown a significant change depending on the drying powers and application of HIU pre-treatment. The closest color values to the fresh sample were found for the microwave-dried samples at 200 W with HIU pre-treatment during 20 min. In overall, microwave drying process was proven to be more effecient when combined with HIU-pretreatment to acquire a high-quality food product along with an enhanced bioactive components & color.
Published
Issue
Section
License
Once a paper is accepted for publication, the author is assumed to have transferred its copyright to the Publisher. The Publisher will not, however, put any limitation on the personal freedom of the author to use material from the paper in other publications. From September 2019 it is required that authors explicitly sign a copyright release form before their paper gets published. The Author Copyright Release form can be found here