Effect of hot-air and freeze-drying on the quality attributes of dried pomegranate (Punica granatum L.) arils during long-term cold storage of whole fruit
Date
2020-10-22
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
: This study investigated the effect of hot-air and freeze-drying on the physicochemical,
phytochemical and antioxidant capacity of dried pomegranate arils during long-term cold storage
(7 ± 0.3 ◦C, with 92 ± 3% relative humidity) of whole fruit over a single experiment. Extracted arils
were processed at monthly intervals during 12 weeks of cold storage of whole fruit. After the 12-week
storage period, hot-air and freeze-dried arils showed the least (3.02) and highest (23.6) total colour
difference (TCD), respectively. Hot-air dried arils also contained 46% more total soluble solids (TSS)
than freeze-dried arils. During the storage of pomegranate fruit, total phenolic content (TPC) steadily
increased from 20.9 to 23.9 mg GAE/100 mL and total anthocyanin content (TAC) increased from 6.91
to 8.77 mg C3gE /100 mL. Similarly, an increase in TPC and TAC were observed for hot-air (9.3%;
13%) and freeze-dried arils (5%; 5%), respectively. However, the radical scavenging activity (RSA)
reduced by 8.5 and 17.4% for hot-air and freeze-dried arils, respectively, after 12 weeks of cold storage.
Overall, the parameters such as colour, TPC and TAC as well as the lower degradation in RSA stability
during storage showed distinct differences in quality when using the freeze-drying method, which is,
therefore, recommended.
Description
CITATION: Adetoro, A. O., Opara, U. L. & Fawole, O. A. 2020. Effect of hot-air and freeze-drying on the quality attributes of dried pomegranate (Punica granatum L.) arils during long-term cold storage of whole fruit. Agriculture, 10(11):493, doi:10.3390/agriculture10110493.
The original publication is available at https://www.mdpi.com
The original publication is available at https://www.mdpi.com
Keywords
Pomegranate (Punica granatum L.), Dried pomegranate -- Storage, Cold storage, Fruit -- Drying -- Effect of freezes on, Fruit -- Drying -- Effect of temperature on, Total phenolic content, Total soluble solids, Phenols
Citation
Adetoro, A. O., Opara, U. L. & Fawole, O. A. 2020. Effect of hot-air and freeze-drying on the quality attributes of dried pomegranate (Punica granatum L.) arils during long-term cold storage of whole fruit. Agriculture, 10(11):493, doi:10.3390/agriculture10110493.