In this paper, we describe synthesis and application of an iron porphyrinc metal–organic framework PCN-222(Fe) for solid phase extraction of aspartame, an artificial non-saccharine sweetener, from gum, juice and diet soft drink samples prior to its determination by spectrophotometry. The mesoporous MOF was synthesized solvo-thermally and characterized by Fourier transform-infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, and Brunauer–Emmett–Teller techniques. To obtain the best extraction efficiency of aspartame, significant affecting parameters such as pH of sample solution, amount of the sorbent, type and volume of eluting solvent, and adsorption and desorption times were investigated and optimized. Under optimum conditions, the calibration graph for aspartame was linear in the range of 0.1 to 100.0 mg.L−1 and relative standard deviation of aspartame was 1.7% (n = 7). Limit of detection of method calculated as 0.019 mg.L−1 and the enrichment factor of 350 folds was obtained. Adsorption capacity of synthesized sorbent was found to be 356 mg.g−1. Hierarchical porosity, the eight terminal–OH groups of the Zr6 node, and hydrogen bonding possibly play vital role for selective adsorption of aspartame. The optimized method was successfully applied to the determination of aspartame in real samples with reasonable recoveries (> 98%).

中文翻译：

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PCN-222金属-有机框架：一种选择性高效吸附剂，用于在分光光度法测定前从口香糖，果汁和减肥软饮料中提取阿斯巴甜

在本文中，我们描述了一种铁卟啉金属-有机骨架PCN-222（Fe）的合成和应用，用于从口香糖，果汁和饮食软饮料样品中固相萃取阿斯巴甜，一种非糖精甜味剂。通过分光光度法。介孔MOF溶剂热合成，并通过傅里叶变换红外光谱，粉末X射线衍射，扫描电子显微镜和Brunauer-Emmett-Teller技术进行表征。为了获得最佳的阿斯巴甜提取效率，研究并优化了一些重要的影响参数，例如样品溶液的pH，吸附剂的量，洗脱溶剂的类型和体积以及吸附和解吸时间。在最佳条件下，阿斯巴甜的校准曲线在0.1至100.0 mg范围内呈线性关系。L-1和阿斯巴甜的相对标准偏差为1.7％（n = 7）。方法的检出限计算为0.019 mg.L-1，富集系数为350倍。发现合成吸附剂的吸附容量为356 mg.g-1。分层孔隙度，Zr6节点的八个末端-OH基团以及氢键可能对阿斯巴甜的选择性吸附起着至关重要的作用。该优化方法成功地用于了实际样品中阿斯巴甜的测定，回收率合理（> 98％）。氢键可能对阿斯巴甜的选择性吸附起着至关重要的作用。该优化方法成功地用于了实际样品中阿斯巴甜的测定，回收率合理（> 98％）。氢键可能对阿斯巴甜的选择性吸附起着至关重要的作用。该优化方法成功地用于了实际样品中阿斯巴甜的测定，回收率合理（> 98％）。