Flow‐injection chemiluminescence of the luminol–potassium periodate system enhanced by TGA–capped CdTe quantum dots for the determination of theophylline

Abstract

The chemiluminescence (CL) behaviour of the luminol-potassium periodate system enhanced by CdTe quantum dots capped with thioglycolic acid (TGA-CdTe QDs) was studied using kinetic experiments, CL spectra, UV-vis absorption spectra and fluorescence spectra. The production of oxygen-containing reactant intermediates (O 2•− and OH • ) in the present CL system was verified by CL. The possible CL mechanism was discussed in detail. Furthermore, theophylline (THP) was determined based on its enhancement of the CL intensity of the CdTe QDs-luminol-potassium periodate system coupled with a flow-injection technique. Under these optimized conditions, the linear range was found to be from 1.0 × 10 −8 to 1.0 × 10 −5 g/mL with a detection limit of 2.8 × 10 −9 g/mL (3σ). The recoveries for the determination of THP in tablets were from 98.2 to 99.6%.

Nanomaterials for light-mediated therapeutics in deep tissue

“…TGA-capped CdTe quantum dots (QDs) catalysed the luminol–KIO 4 CL system by generating radicals. 41 KIO 4 is stongly oxidizing and injected a hole into the valence band of CdTe QDs, producing O 2 ˙ − . The presence of a reducer, hydroxide ions (OH − ), injected an electron into the conduction band of CdTe QDs, producing ˙OH.…”

“…TGA-capped CdTe quantum dots (QDs) catalysed the luminol-KIO 4 CL system by generating radicals. 41 KIO 4 is stongly oxidizing and injected a hole into the valence band of CdTe QDs, producing O 2…”

Bright solid‐state luminescence of green‐red tunable CdTe@BaCO3 composite: Synthesis and properties

“…Colloidal quantum dots (QDs) such as CdTe have attracted much attention due to their unique characteristics, including nanoscale, wide absorption spectrum for short wavelengths, high PL quantum yield, excellent color purity, lower light scattering and size adjustable optical characteristics 8–12 . However, the development of CdTe QDs in solid‐state applications is hampered by their severe aggregation‐induced luminescence quenching.…”