Evaluation of growth, primary productivity, nutritional composition, redox state, and antimicrobial activity of red seaweeds Gracilaria debilis and Gracilaria foliifera under pCO2-induced seawater acidification

Journal Article

2022

Published in: https://doi.org/10.1016/j.molliq.2021.118356

In the present study, a novel colorimetric dual sensor for ultra sensitive detection of S2- ion or cysteine was designed by the encapsulation of Ag-ZnCo2O4 nanocomposite on chitosan (CS) matrix (CS-Ag-ZnCo2O4 NCs). The CS-Ag-ZnCo2O4 NCs was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR) and energy-dispersive X-ray spectroscopy (EDAX). TEM results shows that the nanomaterial was polydisperse in nature. The zeta potential and particle size of NCs were found to be −35.4 mV ± 3 mV and 12 ± 2 nm respectively. The synthesized NCs were highly sensitive, specific and sensitive towards the detection of S2- ion or cysteine. The dual detection of S2- ion or cysteine was confirmed by the disappearance of UV–visible absorption spectra of CS-Ag-ZnCo2O4 NCs at 404 nm. Here, the limit of detection (LOD) of S2- ion or cysteine by the present probe was calculated to be 0.62 nM and 2.87 nM. In advent, the detection of S2- ion or cysteine under varying environmental conditions were also performed. Thus, the CS-Ag-ZnCo2O4 NCs provides a convenient and reliable way for the detection of S2- ion or cysteine.