College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Department of Chemistry and Institutes of Biomedical Science, Fudan University, Shanghai 200032, China.
State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China.
Food Chem. 2018 Mar 1;242:16-21. doi: 10.1016/j.foodchem.2017.08.086. Epub 2017 Aug 30.
Method development for monitoring economically motivated food adulteration is pivotal for preventing health problems caused by illegal food additives. In this work, low-field nuclear magnetic resonance (LF-NMR) spectroscopy and magnetic resonance imaging (MRI) was applied for the detection and mapping of adulterated prawns injected with different hydrocolloids including gelatin, carrageenan, agar, amorophophallus konjac and xanthan gum. The characteristic T fitting curves were obtained which can be used to tell apart adulterated prawns from normal ones. Furthermore, the benefit from high quality LF-MRI images showed the major accumulation site of the hydrocolloids injected in prawn. The location of these injections was mainly confined to well resolved accumulation in brain region and three following subtle sites: back, tail and claws. Different hydrocolloids can be successfully distinguished in adulterated prawns with principal component analysis. Therefore, rapid, non-invasive and low-cost LF-NMR technique offers a powerful tool for the identification of hydrocolloids adulteration in real-time.
方法开发用于监测经济动机的食品掺假对于防止非法食品添加剂引起的健康问题至关重要。在这项工作中，低场核磁共振（LF-NMR）光谱和磁共振成像（MRI）被用于检测和绘制注入不同水胶体的掺假对虾，包括明胶、卡拉胶、琼脂、魔芋和黄原胶。获得了特征 T 拟合曲线，可用于区分掺假对虾和正常对虾。此外，来自高质量 LF-MRI 图像的优势显示了水胶体在对虾中注射的主要积累部位。这些注射的位置主要局限于大脑区域和随后的三个细微部位的良好分辨的积累：背部、尾部和爪子。主成分分析可成功区分掺假对虾中的不同水胶体。因此，快速、非侵入性和低成本的 LF-NMR 技术为实时识别水胶体掺假提供了有力工具。
