Antimonotungstate-Based Heterometallic Framework Formed by the Synergistic Strategy of In Situ-Generated Krebs-Type Building Units and the Substitution Reaction and Its High-Efficiency Biosensing KRAS Gene

Le résumé fourni par la source

A novel antimonotungstate (AT)-based heterometallic framework {[Er(H 2 O) 6 ] 2 [Fe 4 (H 2 pdc) 4 (B-β-SbW 9 O 33 ) 2 ]}·50H 2 O ( 1, H 2 pdc = pyridine-2,5-dicarboxylic acid) was obtained through a synergistic strategy of in situ-generated transition-metal-encapsulated polyoxometalate (POM) building units and the substitution reaction. Its structural unit is composed of a tetra-Fe III -substituted Krebs-type [Fe 4 (H 2 pdc) 4 (B-β-SbW 9 O 33 ) 2 ] 6– subunit and two [Er(H 2 O) 6 ] 3+ cations. This subunit can be regarded as a product of carboxylic oxygen atoms of H 2 pdc ligands replacing active water ligands in the [Fe 4 (H 2 O) 10 (B-β-SbW 9 O 33 ) 2 ] 6– species. Apparently, the substitution action of carboxylic oxygen atoms of H 2 pdc ligands for active water ligands, together with the coordination function of Er 3+ ions, plays a connection role in the architecture of the three-dimensional (3-D) heterometallic framework. Based on the stability and high redox activity of 1, a glassy carbon electrode modified by 1 is used for the construction of an electrochemical biosensor (ECBS). Thus, such 1 -based ECBS can sensitively detect the KRAS gene (a key genetic marker for identifying the occurrence of malignant tumors) and displays a low detection limit (0.106 pM), high selectivity, and reproducibility. This work not only provides a feasible approach to prepare novel multicomponent POM-based heterometallic frameworks but also establishes a new platform for biosensing the KRAS gene and extends the application scope of POM-based functional materials.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.