不均匀场下基于分子间双量子相干核磁共振技术的果肉检测

核磁共振（NMR）谱图可在不破坏生物样品的状态下提供组织成分组成及其含量的信息，已被广泛应用于生物、医学和食品检测等领域.NMR谱图分辨率越高，提供的与组织成分相关的信息越丰富、越准确，也越有利于未知成分的定性和定量分析.传统的高分辨NMR谱图通常要在均匀磁场下采集.但在实际应用中，均匀的磁场较难获得.这就使得我们采集的NMR谱图的分辨率，以及由此获得的生物组织成分组成和含量等信息的准确性受到影响.源于远程偶极相互作用的分子间双量子相干（iDQC）技术对磁场均匀度不敏感，可在不均匀场下获得高分辨率NMR谱图.本文采用基于iDQC技术的IDEAL-Ⅱ序列对甲基丙烯酸丁酯、蕃茄和西瓜三种样品进行了NMR实验，结果证明基于iDQC技术在不均匀场下获得水果的高分辨NMR谱图是可行的，这对食品科学以及食品检测具有积极的意义.

Intermolecular Double-Quantum Coherence NMR Spectroscopy of Fruits Under Inhomogeneous Field

Nuclear magnetic resonance (NMR) spectroscopy is an effective way to obtain in situ chemical information in biological tissues, and used in various application fields, including biology, food and medicine. It is often desirable to acquire high-resolution spectra of obtain more information of the sample, such as J-couplings, split structure and etc. However, acquiring high-resolution spectra under inhomogeneous field can be challenging. It has been shown previously that intermolecular double-quantum coherence (iDQC) derived from remote dipole-dipole interactions are insensitive to magnetic field inhomogeneity, and can be utilized to obtain high-resolution spectra under inhomogeneous fields. In this work, the IDEAL-II sequence was used to detect iDQC in butyl methacrylate, tomato and watermelon under inhomogeneous fields to obtain high-resolution spectra of these samples. The results demonstrated that the iDQC technology may provide a valuable tool in food science research.