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. 2021 Jul 20:8:678643.
doi: 10.3389/fnut.2021.678643. eCollection 2021.

Shelf-Life Extension of Large Yellow Croaker (Larimichthys crocea) Using Active Coatings Containing Lemon Verbena (Lippa citriodora Kunth.) Essential Oil

Affiliations

Shelf-Life Extension of Large Yellow Croaker (Larimichthys crocea) Using Active Coatings Containing Lemon Verbena (Lippa citriodora Kunth.) Essential Oil

Bo Li et al. Front Nutr. .

Abstract

Active coating could improve the fish quality and extend the shelf life. This study investigates the effect of locust bean gum (LBG) and sodium alginate (SA) active coatings containing lemon verbena (Lippa citriodora Kunth.) essential oil (LVEO) emulsions on microbiological, physicochemical and organoleptic evaluation of large yellow croaker (Larimichthys crocea) samples during refrigerated storage at 4°C. Results showed that LBG-SA coatings incorporated with 0.30 or 0.60% LVEO emulsions significantly inhibited the growth of mesophile bacteria, Pseudomonas spp., H2S-producing bacteria, lactic acid bacteria (LAB) and psychrophilic bacteria, and reduce the productions of trimethylamine (TMA), total volatile basic nitrogen (TVB-N) and ATP-related compounds. Further, the LVEO treatments also retarded the water migration and maintained the organoleptic evaluation results of large yellow croaker during storage at 4°C. In conclusion, the LBG-SA active coatings incorporated with LVEO emulsions maintained the quality and extended the shelf life of large yellow croaker during refrigerated storage.

Keywords: active coating; essential oil; large yellow croaker; shelf-life extension; total volatile basic nitrogen.

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Conflict of interest statement

LZ was employed by the company Shanghai Guo Qi Testing Services Technology Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Changes in total viable counts (TVC, A), Pseudomonas spp. counts (B), H2S-producing bacteria counts (C), lactic acid bacteria counts (LAB, D), and psychrophilic counts (E) of large yellow croaker samples during refrigerated storage (CK, large yellow croaker samples were treated with LBG-SA active coating without LVEO emulsion; LYC-0.15%LVEO, large yellow croaker samples were treated with LBG-SA active coating incorporated with 0.15% LVEO emulsion; LYC-0.30%LVEO, large yellow croaker samples were treated with LBG-SA active coating incorporated with 0.30% LVEO emulsion; and LYC-0.60%LVEO, large yellow croaker samples were treated with LBG-SA active coating incorporated with 0.60% LVEO emulsion).
Figure 2
Figure 2
Changes in total volatile basic nitrogen (TVB-N, A), trimethylamine (TMA, B), K-values (C), peroxide value (POV, D), thiobarbituric acid reactive substance (TBARS, E), and free fatty acids contents (FFA, F) of large yellow croaker samples during refrigerated storage.
Figure 3
Figure 3
Results of magnetic resonance image (MRI) of large yellow croaker samples under different treatment during refrigerated storage.
Figure 4
Figure 4
Changes in hardness of large yellow croaker samples during refrigerated storage. Different letters in same day from different groups indicate a significant difference (p < 0.05).
Figure 5
Figure 5
Changes in color (A), elasticty (B), mucus (C), muscular tissue (D), and smell (E) of large yellow croaker samples during refrigerated storage.

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