Wang Mengyao, Li Yiting, Wang Zhenjie, Li Haitao, Zuo Changzhou, Zhao Jingyuan, Yang Yucan, Tu Kang, Lan Weijie, Pan Leiqing
College of Food Science and Technology, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya, Hainan, 572024, China.
College of Food Science and Technology, Nanjing Agricultural University, No. 1 Weigang Road, Nanjing 210095, China.
Food Chem. 2025 Jun 15;477:143504. doi: 10.1016/j.foodchem.2025.143504. Epub 2025 Feb 19.
In this study, the water distribution and migration of bruised 'Korla' pear flesh during storage, as well as their relationships with optical properties and light propagation, were comprehensively investigated based on the low-field nuclear magnetic resonance (LF-NMR) coupled with Monte Carlo simulations. The immobilized water clearly transferred to free water during pear tissues bruising. The optical absorption coefficient (μ) around 1480 nm was strongly correlated with the LF-NMR T relaxation time of bruised pear tissues by 2D-COS. The reduced scattering coefficient (μ') declined with increasing degrees of bruising. In absorption process of bruised pear tissues at 1482 nm, the photons transmission distance from light source increased from 10.76 mm to 15.39 mm. The support vector machines discriminant analysis (SVM-DA) model based on μ' in 900-1650 nm provided an accuracy of 95.4 %. These results provided fundamental supports to develop advanced optical models to evaluated the early bruised fruits.
在本研究中，基于低场核磁共振（LF-NMR）结合蒙特卡罗模拟，全面研究了‘库尔勒’香梨果肉在贮藏期间的水分分布与迁移，以及它们与光学性质和光传播的关系。在梨组织损伤过程中，束缚水明显转化为自由水。通过二维相关光谱（2D-COS）分析发现，1480 nm左右的光吸收系数（μ）与损伤梨组织的LF-NMR T2弛豫时间密切相关。随着损伤程度的增加，约化散射系数（μ'）下降。在1482 nm处损伤梨组织的吸收过程中，光源发出的光子传输距离从10.76 mm增加到15.39 mm。基于900 - 1650 nm范围内μ'的支持向量机判别分析（SVM-DA）模型的准确率为95.4%。这些结果为开发先进的光学模型以评估早期损伤果实提供了基础支持。
