Fluorescence turn-off detection of myoglobin as a cardiac biomarker using water-stable L-glutamic acid functionalized cesium lead bromide perovskite quantum dots.

Water dispersible L-glutamic acid (Glu) functionalized cesium lead bromide perovskite quantum dots (CsPbBr PQDs), namely CsPbBr@Glu PQDs were synthesized and used for the fluorescence "turn-off" detection of myoglobin (Myo). The as-prepared CsPbBr@Glu PQDs exhibited an exceptional photoluminescence quantum yield of 25% and displayed emission peak at 520 nm when excited at 380 nm. Interestingly, the fluorescence "turn-off" analytical approach was designed to detect Myo using CsPbBr@Glu PQDs as a simple optical probe.

Synthesis of multicolor silver nanostructures for colorimetric sensing of metal ions (Cr, Hg and K) in industrial water and urine samples with different spectral characteristics.

In this work, we have synthesized four different color (yellow, orange, green, and blue (multicolor)) silver nanostructures (AgNSs) by chemical reduction method where silver nitrate, sodium borohydride and hydrogen peroxide were used as reagents. The as-synthesized multicolor AgNSs were successfully functionalized with bovine serum albumin (BSA) and applied as a colorimetric sensor for the assaying of metal cations (Cr, Hg, and K). The addition of metal ions (Cr, Hg, and K) into BSA functionalized AgNSs (BSA-AgNSs) causes the aggregation of BSA-AgNSs, and are accompanied by visual color changes with red or blue shift in the surface plasmon resonance (SPR) band of BSA-AgNSs.