Chemiluminescence of off‐line and on‐line gold nanoparticle‐catalyzed luminol system in the presence of flavonoid

Abstract

It was found that flavonoids could remarkably inhibit the chemiluminescence (CL) intensity of an off-line gold nanoparticle (AuNP)-catalyzed luminol-H O CL system. By contrast, flavonoids enhanced the CL intensity of an on-line AuNP-catalyzed luminol-H O CL system. In the off-line system, the AuNPs were prepared beforehand, whereas in the on-line system, AuNPs were produced by on-line mixing of luminol prepared in a buffer solution of NaHCO - Na CO and HAuCl with no need for the preliminary preparation of AuNPs. The on-line system had prominent advantages over the off-line system, namely a lowering of the background noise and improvements in the stability of the CL system. The results show that differences in the signal suppression effect of flavonoids on the off-line AuNP-catalyzed CL system are influenced by the combined action of a free radical scavenging effect and occupy-sites function; the latter was proved to be predominant using controlled experiments. Enhancement of the on-line system was ascribed to the presence of flavonoids promoting the on-line formation of AuNPs, which better catalyzed the luminol-H O CL reaction, and the enhancement activity of the six flavonoids increased with the increase in reducibility. This work broadens the scope of practical applications of an AuNP-catalyzed CL system.

Natural catalyst for luminol chemiluminescence: application to validate peroxide levels in commercial hair dyes

“…[ 5–9 ] Specifically, several ecofriendly catalysts, such as anionic peroxidase extracted from plants, have been shown to be highly sensitive to the oxidation of luminol in the absence of any enhancer. [ 10,11 ] For example, anionic peroxidases extracted from soybean, [ 12 ] African oil palm tree, [ 13 ] sweet potato, [ 14 ] royal palm leaf, [ 15 ] and Jatropha curcas [ 16 ] have been identified as potential catalysts for the luminol–H 2 O 2 CL reaction. Notably, gold nanoparticles with Crinum macowanii bulbs [ 17 ] have been used as an enhancer for the luminol–H 2 O 2 CL reaction.…”

Chemiluminescence of 3‐aminophthalic acid anion–hydrogen peroxide–cobalt (II)

“…Among these, the CL related to luminol (3‐aminophthalhydrazide) has been one of the most widely studied CL systems. Based on its efficient CL, luminol CL detection has been used in many fields for detection of various metal ions, reactive oxygen species, oxidants, etc . Inspired by the CL of luminol, some luminol analogues have been synthesized to achieve more efficient CL processes and expand the range of emission wavelengths (Figure S1).…”