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

Adegoke Olusesan Adetoro, Umezuruike Linus Opara and Olaniyi Amos Fawole
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Adegoke Olusesan Adetoro: Department of Horticultural Science, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa
Umezuruike Linus Opara: Africa Institute for Postharvest Technology, South African Research Chair in Postharvest Technology, Postharvest Technology Research Laboratory, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa
Olaniyi Amos Fawole: Department of Horticultural Science, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa

Agriculture, 2020, vol. 10, issue 11, 1-16

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.

Keywords: cold storage; fresh arils; dried methods; total soluble solids; total phenolic content; storage stability (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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