目的 研究不同干燥过程中光皮木瓜水分迁移变化规律。方法 利用低场核磁共振（LF-NMR）技术无损、非侵入的技术优势，监测不同干燥方式（热风干燥、蒸制后干燥、分段式干燥、阴干）下光皮木瓜的横向弛豫时间（T₂）反演谱，分析水分迁移变化。结果 新鲜光皮木瓜片中含有3种状态的水，其含量为自由水 > 结合水 > 不易流动水，热风干燥、蒸制后干燥、阴干的规律相似，总水分逐渐散失，水分与非水组分的结合力会增强，蒸制加快了木瓜片的失水率，蒸制后干燥与热风干燥下木瓜片失水速率有显著性差异（P<0.05）。分段式烘干中，干燥的间歇阶段会发生不同状态水分之间的转换，以重新达到相对稳定的平衡状态。低温干燥对木瓜组织破坏较小，更利于组织中不易流动水转化为自由水，进而较快散失，而高温干燥在前期就对木瓜片组织结构造成破坏，组织收缩变形，水分与非水组织间的结合力出现短暂增强的现象。结论 光皮木瓜干燥过程中3种状态的水分含量与LF-NMR T₂谱的峰面积有较高的相关性，LF-NMR技术为光皮木瓜中水分分布及变化规律研究提供了直观的参考依据，为木瓜的加工开发提供理论基础。

Objective To study the moisture transfer laws of Chaenomeles sinensis in different drying processes. Methods Using the non-destructive and non-invasive technique of low field-nuclear magnetic resonance (LF-NMR), the transverse relaxation time (T₂) inversion spectrum of C. sinensis slice was monitored under different drying methods (hot air drying, drying after evaporation, segmental drying and drying in the shade) to analyze the changes of moisture migration. Results There were three different types water that were detected in C. sinensis (free water > bound water > immobilized water). The internal water distribution and water content changed during drying process. The moisture changes were similar in hot air drying, drying after steaming, and drying in shade, the total water gradually decreased, and the combining degree between moisture and non-water components enhanced. Steaming promoted the water loss rate of C. sinensis slice, the water loss rate was higher in drying after steaming than in hot air drying, and the difference was significant (P < 0.05). During the intermittent drying, the conversion of different states of water would occur in order to return to a relatively stable equilibrium. During the low temperature drying process, immobilized water content decreased and free water content increased. The low-temperature drying has less damage to the tissue, which is more conducive to the conversion of immobilized water into free water, and thus the water dissipated faster. During the early of drying, high temperature caused tissue structure damage, the bonding force between water and non-aqueous tissue would be strengthened because of the tissue shrinkage. Conclusion The three different types water content and peak area in T₂ was positively correlated. The LF-NMR technique would provide useful guides for the investigation of water distribution and variation of C. sinensis, which will provide a theoretical basis for C. sinensis processing.

现代农业产业技术体系建设专项资金（CARS-21）；山东省科学院先导专项；山东省泰山学者岗位专家支持项目