Effects of lysozyme (LYS) combined with cinnamaldehyde (CA) on quality enhancement of olive flounder (Paralichthys olivaceus) fillets during refrigerated storage at 4 °C for 20 days were assessed. Changes of total viable count (TVC), K-value, total volatile basic nitrogen (TVB-N), thiobarbituric acid (TBA), texture profile analysis (TPA), and trichloroacetic acid-soluble peptide (TCA-soluble peptide) in samples were determined periodically. Results demonstrated that the combination of LYS and CA treatment enhanced the antibacterial activity against S. putrefaciens and P. fluorescens, and lowered TVC values. Meanwhile, LYS combined with CA significantly retarded the increases of TBA value, TVB-N, K-value, and TCA-soluble peptide content compared to the control. Furthermore, the combined treatment also effectively maintained the texture properties of flounder fillets during the storage period. The efficiency was better than that of LYS or CA treatment alone. Thus, LYS combined with CA is promising in olive flounder shelf life extension.

中文翻译：

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溶菌酶联合肉桂醛对橄榄比目鱼（Paralichthys olivaceus）鱼片贮藏品质的影响

评估了溶菌酶 (LYS) 与肉桂醛 (CA) 结合对橄榄比目鱼 (Paralichthys olivaceus) 鱼片在 4 °C 冷藏 20 天期间提高质量的影响。样品中总活菌数 (TVC)、K 值、总挥发性碱性氮 (TVB-N)、硫代巴比妥酸 (TBA)、质地剖面分析 (TPA) 和三氯乙酸可溶肽 (TCA-可溶肽) 的变化是定期确定的。结果表明，LYS 和 CA 处理的组合增强了对 S. putrefaciens 和 P. fluorescens 的抗菌活性，并降低了 TVC 值。同时，与对照相比，LYS 与 CA 联合显着延缓了 TBA 值、TVB-N、K 值和 TCA 可溶性肽含量的增加。此外，联合处理还有效地保持了鲽鱼片在储存期间的质地特性。疗效优于单独使用 LYS 或 CA 治疗。因此，LYS 与 CA 相结合在橄榄比目鱼保质期延长方面很有前景。