Dong Qunhui, Hu Jiamiao, Lu Yihui, Cao Yujin, Lin Shaoling
College of Food Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Foods. 2025 Jun 29;14(13):2307. doi: 10.3390/foods14132307.
Low-frequency alternating electromagnetic fields (LF-AEMF) represent an innovative processing technology with significant potential for extending the shelf life of fruits and vegetables by modulating key physiological processes. In this study, the impact of the LF-AEMF intensities (1300, 1800, and 2500 V) on the postharvest preservation of satsuma mandarins was evaluated. Compared to the control group, the LF-AEMF-treated samples exhibited reduced weight loss (0.62% vs. 2.11%), respiration rate (32.73 vs. 40.08 mg/kg·h), and malondialdehyde (MDA) content (40.80 vs. 34.87 nmol/g) after 40 days of storage. In addition, LF-AEMF treatment also effectively preserved titratable acidity (TA) (0.34% vs. 0.30%), vitamin C (Vc) content (7.77 vs. 7.05 g/100 g), and phenylalanine ammonia-lyase (PAL) activity (79.757 vs. 62.395 U/g). E-nose analysis and low-field NMR further revealed that the application of LF-AEMF effectively facilitated the superior preservation of the intrinsic flavor profile of the satsuma mandarins and mitigated the loss of free water within the fruit. Overall, this research provides valuable insights for the potential application of LF-AEMF in extending the storage life of citrus fruits, which may also be applicable to other seasonal fruits and vegetables that require long-term storage.
低频交变电磁场（LF-AEMF）是一种创新的加工技术，通过调节关键生理过程，在延长水果和蔬菜货架期方面具有巨大潜力。在本研究中，评估了低频交变电磁场强度（1300、1800和2500 V）对温州蜜柑采后保鲜的影响。与对照组相比，经低频交变电磁场处理的样品在储存40天后，失重率降低（0.62%对2.11%）、呼吸速率降低（32.73对40.08 mg/kg·h）、丙二醛（MDA）含量降低（40.80对34.87 nmol/g）。此外，低频交变电磁场处理还有效保持了可滴定酸度（TA）（0.34%对0.30%）、维生素C（Vc）含量（7.77对7.05 g/100 g）和苯丙氨酸解氨酶（PAL）活性（79.757对62.395 U/g）。电子鼻分析和低场核磁共振进一步表明，低频交变电磁场的应用有效促进了温州蜜柑内在风味的优质保存，并减轻了果实内自由水的损失。总体而言，本研究为低频交变电磁场在延长柑橘类水果储存期方面的潜在应用提供了有价值的见解，这也可能适用于其他需要长期储存的季节性水果和蔬菜。
