Articles
Is chitosan edible coating suitable as alternative treatment for SO2 in reducing rot and postharvest losses of grapes during short supply chain?
Article number
1386_32
Pages
239 – 246
Language
English
Abstract
Several studies have shown that 1% chitosan (CHI) edible coating can improve the quality of table grapes and resistance to rotting during storage, but no one has indicated to what extent CHI can be relied upon as a substitute treatment for SO2 during short supply chain.
The present study focused on comparing CHI and SO2 as anti-fungal materials during short supply chain of table grapes.
Grape (Vitis vinifera L. Flame Seedless) clusters were treated with distilled water (control), 1% CHI and dual release SO2 pad.
Afterward, the clusters were placed in perforated (4%) plastic punnets (approximately 450 g each), put in carton boxes, cooled and stored at 0°C with 95% relative humidity (RH). After 10, 20 and 30 days of storage a group of each treatment was transferred to shelf-life for 2 days at 20°C and then evaluated.
Weight loss, decay incidence, berry shattering, total postharvest losses (TPL), berry firmness, berry skin colour hue angle (h°), visual appearance index, rachis chlorophyll content, rachis browning index (BI), total soluble solids (TSS) titratable acidity (TA) and respiration rate were estimated.
The results elucidated that SO2 and CHI treatments showed significant benefits compared to the control treatment.
Up to 20 days storage plus 2 days shelf-life, both SO2 1% CHI treatments were statistically equal but SO2 showed superiority by extending storage period regarding weight loss and decay incidence.
On the other hand, CHI treatment showed superiority throughout all storage periods regarding delaying berry shattering, rachis chlorophyll content, BI and clusters respiration rate.
The results suggested that it could be recommended to use postharvest application of 1% CHI as alternative treatment for SO2 to control rot, reduce TPL and keeping the quality of Flame Seedless grapes during short supply chain at 0°C with 95% RH for two weeks plus two days shelf-life at 20°C.
The present study focused on comparing CHI and SO2 as anti-fungal materials during short supply chain of table grapes.
Grape (Vitis vinifera L. Flame Seedless) clusters were treated with distilled water (control), 1% CHI and dual release SO2 pad.
Afterward, the clusters were placed in perforated (4%) plastic punnets (approximately 450 g each), put in carton boxes, cooled and stored at 0°C with 95% relative humidity (RH). After 10, 20 and 30 days of storage a group of each treatment was transferred to shelf-life for 2 days at 20°C and then evaluated.
Weight loss, decay incidence, berry shattering, total postharvest losses (TPL), berry firmness, berry skin colour hue angle (h°), visual appearance index, rachis chlorophyll content, rachis browning index (BI), total soluble solids (TSS) titratable acidity (TA) and respiration rate were estimated.
The results elucidated that SO2 and CHI treatments showed significant benefits compared to the control treatment.
Up to 20 days storage plus 2 days shelf-life, both SO2 1% CHI treatments were statistically equal but SO2 showed superiority by extending storage period regarding weight loss and decay incidence.
On the other hand, CHI treatment showed superiority throughout all storage periods regarding delaying berry shattering, rachis chlorophyll content, BI and clusters respiration rate.
The results suggested that it could be recommended to use postharvest application of 1% CHI as alternative treatment for SO2 to control rot, reduce TPL and keeping the quality of Flame Seedless grapes during short supply chain at 0°C with 95% RH for two weeks plus two days shelf-life at 20°C.
Authors
K.A. Farouk, G.A. Baghdady, M.Z. Sultan
Keywords
Flame Seedless grapes, rot incidence, browning, postharvest losses, chitosan
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