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Influence of edible coating on quality of plum (Prunus salicina Lindl. cv. ‘Sapphire’)

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Abstract

Edible coating may enhance the boundary layer resistance resulting in enhanced shelf life of fruits. Plums (Prunus salicina Lindl. cv. ‘Sapphire’) were treated with coating material based on carbohydrate (Versasheen) with sorbitol as plasticizer and stored at 20 °C and 85% RH. The influence of coating on the gas transmission rates was estimated using a carrier of 100% cellulose paper. Coating treatment reduced the transmission rate of CO2, O2, and H2O. Changes in fruit weight, fruit flesh firmness, color parameters (L*, a*, and hue angle), soluble solids content, pH, titratable acidity, ethylene, CO2, malondialdehyde (MDA), and VIS/NIR fruit reflectance spectrum were recorded in 2-day interval. Edible coating was effective in delaying the increase of pH and the loss of firmness, titratable acidity, L*, hue angle, and MDA. The incorporation of sorbitol showed beneficial effects on decreasing the weight loss, CO2, and ethylene exchange. In the room temperature storage period, not only fruit ripening was measurable in the VIS (350–750 nm) and NIR (750–1,400 nm) wavelength ranges due to the decrease in the fruit chlorophyll absorption but also water loss, respectively. After 5-day room temperature storage the chlorophyll absorption peak in the spectra was already beyond the detection limit in all treatments, while after 3-day storage, the coating effect on the spectral intensities was feasible to separate control from coated plums.

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Acknowledgments

The project was carried out with the financial support provided by the DFG-Project HESPERIDES (Germany).

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Correspondence to Hyang Lan Eum.

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Eum, H.L., Hwang, D.K., Linke, M. et al. Influence of edible coating on quality of plum (Prunus salicina Lindl. cv. ‘Sapphire’). Eur Food Res Technol 229, 427–434 (2009). https://doi.org/10.1007/s00217-009-1054-8

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  • DOI: https://doi.org/10.1007/s00217-009-1054-8

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