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Open AccessArticle

Antifungal Starch–Gellan Edible Coatings with Thyme Essential Oil for the Postharvest Preservation of Apple and Persimmon

1
Instituto Universitario de Ingeniería de Alimentos para el Desarrollo, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
2
Centro de Tecnología Poscosecha (CTP), Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113 Moncada, Valencia, Spain
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(5), 333; https://doi.org/10.3390/coatings9050333
Received: 9 May 2019 / Revised: 20 May 2019 / Accepted: 21 May 2019 / Published: 24 May 2019
Starch–gellan (80:20) coating formulations were applied to apples and persimmons to analyse their effectiveness controlling the weight loss, respiration rate, fruit firmness, and fungal decay during postharvest. Thyme essential oil (EO) was incorporated (0.25 and 0.5 g per g of polymer) directly or encapsulated in lecithin to enhance antifungal action. Coatings did not reduce weight loss or firmness changes in apples, but they prevented water loss in persimmons. In contrast, no significant effect of the coatings was observed on the respiration rates and the respiration quotient of persimmons, whereas the respiration rates and quotient was increased in apples. On the other hand, the coatings without lecithin reduced the incidence and severity of black spot caused by Alternaria alternata in persimmons, regardless of the content of essential oil. Likewise, these reduced the severity of gray mold caused by Botrytis cinerea in apples. No positive effect of lecithin in coatings was observed on the postharvest quality and decay in either apples or persimmons, nor did EO exert antifungal action despite its proven effectiveness in in vitro tests. View Full-Text
Keywords: cassava starch; gellan; thyme essential oil; antifungal edible coatings; postharvest; fruit cassava starch; gellan; thyme essential oil; antifungal edible coatings; postharvest; fruit
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MDPI and ACS Style

Sapper, M.; Palou, L.; Pérez-Gago, M.B.; Chiralt, A. Antifungal Starch–Gellan Edible Coatings with Thyme Essential Oil for the Postharvest Preservation of Apple and Persimmon. Coatings 2019, 9, 333.

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