Development of a Modified Porphyrin Based Composite for Biomedical Application

Abstract

Zn-TCPP@CNC, a novel fluorescent nanocomposite was prepared by conjugation of Zn-TCPP and CNC. That Zn2+ ions have been successfully coordinated with the porphyrin core, the key functional groups are retained, and the MOF interacts well with the CNC support have been confirmed by structural and optical characterizations, such as UV-Vis, FTIR, and XRD. FESEM analysis showed rod shaped morphology with MOF particles decorated on the surface, this leads to high surface area and less aggregation of the MOF particles, which is ideal in sensing application. Fluorescence of Zn-TCPP@CNC was studied in the process of selectively detecting ascorbic acid. The material had maximum absorption at 420 nm, and showed fluorescence emission spectra with peaks between 600-700nm, which was effectively quenched with the help of ascorbic acid through a photoinduced electron transfer process. Optimization experiments have shown that a material concentration of 200 mL gave both stable and reproducible fluorescence values. The specificity of the sensor was proved by selectivity experiments, which showed low interference with glucose, fructose, urea, uric acid and biogenic amines. Sensitivity analyses demonstrated that the quenching effect was concentration-dependent, and, therefore, allowed the quantitative determination of ascorbic acid. The slope of the calibration curve and the standard deviation of the blank values were used to determine the limit of detection (LOD) which is 18.29 µM. This is explained by the fact that quenching is because of effective molecular interactions, such as hydrogen bonding and photoinduced electron transfer. These findings suggest that Zn-TCPP@CNC is a sensitive, selective, and reliable platform of fluorescence detection of ascorbic acid.