A Novel Electroanalytical Biosensor Based on ZIF‐8/Acetylcholinesterase Bio‐nanohybrids for Early Management of Hirschsprung Disease

Abstract

Hirschsprung's disease (HD) is characterised by missing nerve cells in the colon of infants and children which results in strained bowel movement. Under such situations, undiagnosed and untreated cases often lead to a cascade of gastrointestinal infections eventually resulting in Hirschsprung‐assisted enterocolitis which has significantly high mortality rate. This is further exacerbated by the absence of suitable, sensitive and efficient technologies to detect the pathological segment of the intestine, which could significantly reduce surgery duration in the operation theatre, as well as associated risks to patients. It therefore becomes a matter of extreme importance to develop a point‐of‐care platform for early and efficient management/identification of the occurrence of HD in neonates and older children during its onset, before it proves fatal with life‐threatening outcomes. The present work reports an electrochemical enzymatic biosensor using Zeolitic Imidazolate Framework‐8 (ZIF‐8) modified with acetylcholinesterase enzyme (AchE), for detection of HD as a function of the key biomarker – acetylcholine. The developed sensor was initially characterized using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS), while the analytical performance and insights onto interfacial redox kinetics were assessed using Differential Pulse Voltammetry (DPV) and EIS respectively. The sensor exhibited limit of detection and sensitivity of 0.19 μM and sensitivity of 0.42 μA/μM/mm2 with a shelf life of 1 month, while remaining unperturbed in the presence of common interferants. The performance of developed sensor was also examined in spiked serum samples and was observed to yield a high degree of linearity.

Facile Synthesis of Nonprecious Bimetallic Zeolitic Imidazolate Framework-Based Hierarchical Nanocomposites as Efficient Electrocatalysts for Oxygen Reduction Reaction

“…Furthermore, stretching of the Hmim aromatic ring is responsible for the weak peak at 1630 cm –1 . The strong metal-linker bond such as Co–N or Zn–N at 434 cm –1 confirms the presence of metal centers in Zn/ZIF-8 and Co/ZIF-67@Zn/ZIF-8 MOF structures . Moreover, localized SEM coupled with EDX spectroscopy (SEM-EDX) measurements (Figure c) unequivocally demonstrate the presence of the respective Zn and Co metal nodes in Co/ZIF-67@Zn/ZIF-8 and Zn/ZIF-8 MOF samples.…”