Feasibility of Ultrafast Intermolecular Single-Quantum Coherence Spectroscopy in Analysis of Viscous-Liquid Foods
Feasibility of Ultrafast Intermolecular Single-Quantum Coherence Spectroscopy in Analysis of Viscous-Liquid Foods
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DOI：
10.1007/s12161-014-0046-x
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发表时间：
2015-08
影响因子：
2.9
通讯作者：
Honghao Cai;Hao Chen;Yulan Lin;Jianghua Feng;Xiaohong Cui;Zhong Chen
中科院分区：
文献类型：
--
作者：
Honghao Cai;Hao Chen;Yulan Lin;Jianghua Feng;Xiaohong Cui;Zhong Chen
超快分子间单量子相干（UF iSQC）技术是一种新发展起来的核磁共振（NMR）技术，在无氘环境下具有获得粘性液体样品光谱的潜力。UF iSQC既继承了空间编码超快采集效率的优点，又保持了iSQC在非均匀磁场中抗干扰的固有优点。在本研究中，UF iSQC光谱用于直接分析三个典型的粘性液体食品，即蜂蜜，酸奶，番茄酱料，并通过超快获取这些粘性液体食品的NMR光谱验证了其可行性。UF iSQC光谱提供了一种有利的替代方案，可以在1分钟内直接检测这些样品中的大多数组分，获得有利的光谱信息，从而节省了复杂的样品预处理和繁琐的匀场过程的麻烦。由于对磁场不均匀性的免疫力，UF iSQC技术可以作为稀释、提取NMR和魔角旋转的适当补充。此外，与传统的iSQC方法相比，由于引入了空间编码技术，所提出的方法的捕获时间大大减少。UF iSOC谱的灵敏度和分辨率低于常规NMR方法获得的稀释液，可以通过一些新开发的策略来改善。这里获得的结果表明UF iSQC光谱在食品质量控制中的潜在应用。
A newly developed nuclear magnetic resonance (NMR) technique, ultrafast intermolecular single-quantum coherence (UF iSQC) spectroscopy, demonstrated its potentials to obtain spectra of viscous-liquid samples in deuterium-free environment. UF iSQC not only inherits the advantage of ultrafast acquisition efficiency of spatial encoding but also keeps the intrinsic merit of immunity of iSQC in inhomogeneous magnetic field. In the present study, UF iSQC spectroscopy is used for the direct analysis of three typical viscous-liquid foods, namely, honey, yogurt, and tomato sauce, and its feasibility is verified by ultrafast acquisition of NMR spectra of these viscous-liquid foods. UF iSQC spectroscopy presents an advantageous alternative to directly detect most components of these samples in favorable spectral information within 1 min, thus saving the trouble of complicated sample pretreatments and tedious shimming processes. Due to the immunity to field inhomogeneity, the UF iSQC technique can be a proper supplement to dilution, extraction NMR, and magic angle spinning. In addition, in comparison with the conventional iSQC method, the acquisition time of the proposed method is greatly reduced due to the introduction of the spatial encoding technique. The lower sensitivity and resolution of UF iSOC spectra than those of dilutions acquired by the conventional NMR method could be improved by some newly developed strategies. Results obtained here demonstrate the potential application of the UF iSQC spectroscopy in the quality control of food.