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Edible films and coatings are used to protect food products and improve their quality and shelf life.  The objective of this study was to evaluate the effect of two methyl cellulose- based active coatings on the quality and storage life of tomato.  Fruits were dipped in to active methyl cellulose (MC) coating (MC, glycerol and potassium sorbate) or active MC-palmitic acid coating (MC, glycerol, potassium sorbate and palmitic acid) for 1min at 20^oC, then air-dried at room temperature and stored with uncoated samples at 15 ^oC and 80-85% RH for 21 days. At one day intervals, coated and uncoated fruits were removed and evaluated for weight loss, total soluble solids, titrable acidity, pH, skin color, firmness, failure energy, ascorbic acid content, yeasts and moulds count and overall acceptability.  It was revealed that  the coated fruits showed lower weight loss (up to 2.5 times), ripening rate, spoilage incidence (2-3 times) while, the skin color, ascorbic acid content, sensory quality and overall acceptability were higher in coated tomatoes when compared with control during storage time.  However, non significant differences in the properties of tomato were observed by adding palmitic acid to the formulation of MC active coating.

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This study was designed and performed to evaluate the effect of using the active edible coating of sodium alginate containing different levels of rosemary extract on physicochemical and microbial properties of silver carp-chicken fillet mixed burger during storage. 5 treatments including uncoated burgers (control) with sodium alginate coating enriched with levels of 0, 0.5, 1 and 1.5% of rosemary extract were considered. Burgers were stored at -18 ° C for 3 months. Results showed that the use of sodium alginate coating significantly decreased the percentage of burger cooking drop. Enrichment of sodium alginate coating with different levels of rosemary extract improved its performance (P<0.05). The lowest total microbial count, psychrophilic bacteria count, TVN, PV and TBA were observed in coated burgers containing 1.5% of rosemary extract (P<0.05). There was no statistically significant difference in the performance of coatings containing levels of 1 and 1.5% of rosemary extract in decreasing TBA. Thus it is possible to use the active edible coating of sodium alginate containing 1.5% of rosemary extract to delay bacterial and oxidative spoilage of silver carp-chicken fillet burgers during a 3-month storage period at -18 ° C used.