Sensitive determination of catechol using a glassy carbon electrode modified with l-cysteine and ZnS:Ni/ZnS quantum dots

Abstract

In this work, water-soluble ZnS:Ni/ZnS quantum dots (QDs) with core/shell structure were obtained successfully using mercaptoacetic acid as dressing agent, which were characterized by X-ray diffraction, fourier transform infrared spectroscopy, atomic force microscopy and transmission electron microscope. A highly sensitive and stable electrochemical sensor was developed through immobilizing L-Cysteine and ZnS:Ni/ZnS QDs on the surface of glassy carbon electrode. The sensor showed excellent catalytic activity to catechol (CC).Experimental results showed that the oxidation peak current of CC was linear over the range from 0.5 to 100 µM, and the detection limits (S/N = 3) for CC was 32 nM. The proposed sensor was successfully examined CC in real sample of lake water and revealed stabled and reliable recovery data.

Comparative Metabolomic Analysis of the Cambium Tissue of Non-transgenic and Multi-Gene Transgenic Poplar (Populus × euramericana ‘Guariento’)

“… Haruta et al (2001) propose that PPO contributes to aspen defense by enhancing the toxicity of catechol, and that release of catechol and PPO oxidation is a possible mechanism of toxicity in trembling aspen ( Populus tremuloides ). Indeed, approximately 50% of synthetic catechol is used to consume for pesticides ( Qu et al, 2015 ). Therefore, catechol in transgenic lines has likely a role in insect resistance.…”

Highly sensitive simultaneous electrochemical determination of hydroquinone, catechol and resorcinol based on carbon dot/reduced graphene oxide composite modified electrodes

“…Dihydroxybenzene isomers, hydroquinone (HQ), catechol (CC) and resorcinol (RC), are derived from a wealth of sources, including agriculture, factory discharges, wastewater treatment plants and other related industries. [1][2][3] Owing to their low degradation in the environment and high toxicity to the environment and humans, the US Environmental Protection Agency (EPA) and the European Union have classied dihydroxybenzene isomers as environmental pollutants. 4 Therefore, simultaneous determination of dihydroxybenzene isomers has become a hot topic for scientists.…”