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In this research, the antioxidant and antibacterial characteristics of the chitosan (CH) coating incorporated with lemon verbena essential oil (LVEO) and extract (LVE) on the quality of the rainbow trout packed by vacuum packaging at 4°C were investigated. Samples evaluated include the following: Control, VP, CH, CH‐LVE 2%, CH‐LVEO 1%, and CH‐LVE 1%‐LVEO 0.5% for 16 days at 3 days intervals. All of the samples significantly reduced Psychrotrophic bacteria, total viable counts, Enterobacteriaceae, and H2S producing bacteria as compared with control during keeping time. Thiobarbituric acid reactive substance, peroxide value, total volatile basic nitrogen, and pH value were detected lower in all of the samples than control. CH incorporated with LVE and LVEO gave an agreeable effect on sensory characteristics. Samples containing CH‐LVE 1%‐LVEO 0.5% was often in priority by sensory assessors. Generally, LV can be applied as a substitution for chemical preservatives in fish meat.

This work was carried out to evaluate the microbial and chemical attributes as well as sensory characteristics of turkey breast meat coated with chitosan incorporated with 1% of Origanum vulgare essential oils (oregano EOs) and 1 or 2% of grape seed extract (GSE) stored at refrigerator for 20 days. Gas chromatography-mass spectrometry (GC-MS) assay represented that oregano EO is rich in phenolic compounds mainly carvacrol and thymol. Lipid oxidation, as showed by thiobarbituric acid reactive substances (TBARS) and total volatile basic nitrogen (TVBN) values were significantly (P < 0.05) lower in combined treatments containing both oregano EO and GSE which were 0.71 MDA/kg and 10.04 mg N/100 g, respectively in the chitosan containing 2% GSE and 1% oregano EO treatments. The minimum count of total viable count (TVC), Enterobacteriaceae, Pseudomonas spp., lactic acid bacteria (LAB) and yeast-mold were also determined in these treatments which determined 3.54-4.51 Log CFU/mL on day 20 of cold storage. These combined treatments also obtained the highest sensory scores (the overall acceptability was about 7) due to effective delaying microbial and oxidation activities. Therefore, chitosan-based coating containing GSE and oregano EOs can enhance microbial, chemical and organoleptic properties of fish turkey meat under refrigerated storage.

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