Application of Gum Arabic and Methyl Cellulose Coatings Enriched with Thyme Oil to Maintain Quality and Extend Shelf Life of “Acco” Pomegranate Arils
2020
Tatenda Gift Kawhena | Alemayehu Ambaw Tsige | Umezuruike Linus Opara | Olaniyi Amos Fawole
The effects of gum arabic (GA: 1.5% w/v) and methyl cellulose (MC: 1% w/v) enriched with thyme oil (TO: 0.25 and 0.5% v/v) on the quality of &ldquo:Acco&rdquo: pomegranate arils were studied. Coating treatments, namely, MC, MC + TO0.5%, MC + TO0.25%, GA, GA + TO0.5% and GA + TO0.25% were applied on arils by dipping, and evaluations were made on physicochemical and microbiological quality, phytochemicals and antioxidant capacity of arils stored (5 ±: 1 °:C, 95 ±: 2% RH) for 16 days. Dipping arils in GA or MC, both containing TO (0.5% v/v) significantly (p <: 0.0001) reduced weight loss and enhanced antioxidant activity (FRAP) (p = 0.0014). However, dipping arils in GA combined with TO (0.25% v/v) had the highest influence on reducing aril respiration rate compared with other treatments. Overall, results showed that application of coatings (GA + TO0.5% and GA + TO0.25%) reduced total yeast and mould and total plate counts and maintained quality up to 8 days of storage. These findings suggest that either GA + TO0.5% or GA + TO0.25% coatings have the capability to extend storage life of &ldquo:Acco&rdquo: pomegranate arils.
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