A novel sensor based on metalloporphyrins-embedded covalent organic frameworks for rapid detection of antioxidants in plant oil

In this study, the effect of different exocyclic substituents on the electron transfer ability of metalloporphyrin was investigated. The obtained optimal metalloporphyrins were then fabricated into porphyrin-based COFs materials (COF-366-Zn) through reversible condensation between aldehydes and amines. And it was modified on graphene oxide (GO) to make COF-366-Zn/GO composite as the modification material of glassy carbon electrode (GCE). COF-366-Zn and COF-366-Zn/GO were fully characterized using SEM, EDX, XRD, BET, FT-IR, XPS methods which revealed the formation of COF-366-Zn and spherical structure. The sensor made from this material exhibited high sensitivity and selectivity for the detection of tert-butyl hydroquinone (TBHQ). The response of as developed sensor was linear in the range of 2.5–500 µM TBHQ, R2 = 0.9955. The sensor had negligible response to various interfering substances. Furthermore, this sensor is also used for TBHQ detection in plant oil successfully with acceptable recovery.