Effects of ε-Poly-L-Lysine/Chitosan Composite Coating on the Storage Quality, Reactive Oxygen Species Metabolism, and Membrane Lipid Metabolism of Tremella fuciformis

文献类型： 外文期刊

第一作者： Sun, Junzheng

作者： Sun, Junzheng;Wei, Yingying;Li, Longxiang;Yang, Mengjie;Liu, Yusha;Li, Qiting;Zhou, Shaoxiong;Lai, Chunmei;Chen, Junchen;Lai, Pufu;Sun, Junzheng;Wei, Yingying;Li, Longxiang;Yang, Mengjie;Liu, Yusha;Li, Qiting;Zhou, Shaoxiong;Lai, Chunmei;Chen, Junchen;Lai, Pufu;Sun, Junzheng;Wei, Yingying;Li, Longxiang;Yang, Mengjie;Liu, Yusha;Li, Qiting;Zhou, Shaoxiong;Lai, Chunmei;Chen, Junchen;Lai, Pufu;Yang, Mengjie;Liu, Yusha;Li, Qiting;Zhou, Shaoxiong;Lai, Chunmei

作者机构：

关键词： Tremella fuciformis; epsilon-Poly-L-lysine; chitosan; reactive oxygen species metabolism; membrane lipid metabolism

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.9； 五年影响因子：5.7 ）

ISSN： 1661-6596

年卷期： 2025 年 26 卷 15 期

页码：

收录情况： SCI

摘要： This study aimed to investigate the efficacy of a composite coating composed of 150 mg/L epsilon-Poly-L-lysine (epsilon-PL) and 5 g/L chitosan (CTS) in extending the shelf life and maintaining the postharvest quality of fresh Tremella fuciformis. Freshly harvested T. fuciformis were treated by surface spraying, with distilled water serving as the control. The effects of the coating on storage quality, physicochemical properties, reactive oxygen species (ROS) metabolism, and membrane lipid metabolism were evaluated during storage at (25 +/- 1) degrees C. The results showed that the epsilon-PL/CTS composite coating significantly retarded quality deterioration, as evidenced by reduced weight loss, maintained whiteness and color, and higher retention of soluble sugars, soluble solids, and soluble proteins. The coating also effectively limited water migration and loss. Mechanistically, the coated T. fuciformis exhibited enhanced antioxidant capacity, characterized by increased superoxide anion (O2-) resistance capacity, higher activities of antioxidant enzymes (SOD, CAT, APX), and elevated levels of non-enzymatic antioxidants (AsA, GSH). This led to a significant reduction in malondialdehyde (MDA) accumulation, alongside improved DPPH radical scavenging activity and reducing power. Furthermore, the epsilon-PL/CTS coating preserved cell membrane integrity by inhibiting the activities of lipid-degrading enzymes (lipase, LOX, PLD), maintaining higher levels of key phospholipids (phosphatidylinositol and phosphatidylcholine), delaying phosphatidic acid accumulation, and consequently reducing cell membrane permeability. In conclusion, the epsilon-PL/CTS composite coating effectively extends the shelf life and maintains the quality of postharvest T. fuciformis by modulating ROS metabolism and preserving membrane lipid homeostasis. This study provides a theoretical basis and a practical approach for the quality control of fresh T. fuciformis.

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