Beijing Engineering and Technology Research Center of Food Additives, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University (BTBU), Beijing 100048, China.
Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Chinese Academy of Fishery Sciences, Beijing 100141, China; College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China.
Food Chem. 2023 Feb 15;402:134134. doi: 10.1016/j.foodchem.2022.134134. Epub 2022 Sep 7.
Azo pigments with azo functional groups (-NN-) are commonly used in foods. Through rational design, here we report synthesis of a novel magnetic metal-organic framework (MOF-545) and the use of FeO@MOF-545 for the selective separation of azo pigments from beverages. We find that FeO@MOF-545 exhibits excellent adsorption/removal capacities for new coccine (NC, 459 mg g) and lemon yellow (LY, 476 mg g) individually. The results indicated that the adsorption capacities of FeO@MOF-545 were 5 times higher than reported previously. The large surface area (120.4 m/g) and the suitable pore size (1.6 nm) of FeO@MOF-545 provided multiple accessible channels for azo pigment adsorption. The adsorption kinetics, stability, recovery, and reusability of FeO@MOF-545 were all reported. The recoveries ranged from 92.9 to 104.5%, reflecting the capacity of MOF-545 to efficiently separate NC and LY. FeO@MOF-545 is suitable for azo pigment determination and separation in food matrices.
偶氮色素带有偶氮官能团（-NN-），常用于食品。通过合理设计，我们在这里报告了一种新型磁性金属-有机骨架（MOF-545）的合成，并利用 FeO@MOF-545 从饮料中选择性分离偶氮色素。我们发现 FeO@MOF-545 对新胭脂红（NC，459 mg g）和柠檬黄（LY，476 mg g）具有优异的吸附/去除能力。结果表明，FeO@MOF-545 的吸附容量比以前报道的高出 5 倍。FeO@MOF-545 具有较大的表面积（120.4 m/g）和适宜的孔径（1.6 nm），为偶氮色素的吸附提供了多个可及的通道。我们还报告了 FeO@MOF-545 的吸附动力学、稳定性、回收率和可重复使用性。回收率范围为 92.9%至 104.5%，反映了 MOF-545 有效分离 NC 和 LY 的能力。FeO@MOF-545 适用于食品基质中偶氮色素的测定和分离。
