PCN-222 metal–organic framework: a selective and highly efficient sorbent for the extraction of aspartame from gum, juice, and diet soft drink before its spectrophotometric determination

Abstract

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 Zr 6 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%).

Selective Synthesis of Imines by Photo-Oxidative Amine Cross-Condensation Catalyzed by PCN-222(Pd)

“…1.2 and 3 nm, corresponding to trigonal and hexagonal channels, respectively. 53 However, it is worth mentioning that variation of the reaction conditions for the synthesis, such as the amount and nature of the acid, results in different tunable pore sizes. 50 We used the Horvath−Kawazoe method considering spherical pores to obtain differential pore volume plots (Figure 1, insets).…”

“…Previous simulations and experimental results have shown that PCN-222 has two types of pores, with sizes of ca. 1.2 and 3 nm, corresponding to trigonal and hexagonal channels, respectively . However, it is worth mentioning that variation of the reaction conditions for the synthesis, such as the amount and nature of the acid, results in different tunable pore sizes .…”

Enhanced Ultrasensitive Photoelectrochemical Probe for Phosphate Detection in Water Based on a Zirconium–Porphyrin Framework

“…Based on the above-mentioned discussion, a porous zirconium–porphyrin MOF with the formulation [Zr 6 (μ 3 -OH) 8 (OH) 8 (H 2 TCPP) 2 ] (PCN-222) was selected as an electrode material. PCN-222 has been widely studied in application fields such as catalysis, − adsorption and separation, − drug delivery, and chemical sensing ,, due to its excellent structure and properties. PCN-222 has both photoelectric activity and chemical binding property, and we constructed it as an ultrasensitive PEC probe for phosphate detection.…”

Selective Synthesis of Imines by Photo-Oxidative Amine Cross-Condensation Catalyzed by PCN-222(Pd)

“…The full band assignment for TCCP(H 2 ), TCPP(Pd), PCN-222(H 2 ) and PCN-222(Pd) can be found in Table S2. 11 However, it is worth to mention that modulating different parameters during the syntheses, such as the amount and nature of acids, results in different tunable pore sizes. 12 We used the Horvath-Kawazoe method considering spherical pores to obtain the differential pore volume plots.…”