Embrapa Instrumentação, São Carlos, São Paulo, Brazil.
Magn Reson Chem. 2011 Dec;49 Suppl 1:S113-20. doi: 10.1002/mrc.2841.
Time-domain nuclear magnetic resonance (TD-NMR) is one of the most popular solutions for quality control in the food industry. Despite the recognized success of TD-NMR in quality control and quality assurance, the speed by which samples can be characterized by TD-NMR techniques is still a concern, primarily when considering online or high-throughput applications. Therefore, to enhance the speed of TD-NMR analysis, we developed rapid methods based on steady-state free precession of nuclear spins, which we denoted continuous wave free precession (CWFP). CWFP substantially increases the sensitivity of TD-NMR compared with free induction decay or spin-echo detection, which are traditionally used. The objective of this paper was to present the physical background of CWFP and review its recent developments and applications in fat and oil quantifications in agri-food products.
时域核磁共振（TD-NMR）是食品工业中质量控制最常用的方法之一。尽管 TD-NMR 在质量控制和质量保证方面已经得到了广泛认可，但它对样品进行分析的速度仍然是一个关注点，尤其是在考虑在线或高通量应用时。因此，为了提高 TD-NMR 分析的速度，我们开发了基于核自旋稳态自由进动的快速方法，我们将其命名为连续波自由进动（CWFP）。与传统使用的自由感应衰减或自旋回波检测相比，CWFP 大大提高了 TD-NMR 的灵敏度。本文的目的是介绍 CWFP 的物理背景，并综述其在农产品中脂肪和油定量方面的最新发展和应用。
