Electrochemical Voltammogram Recording for Identifying Varieties of Ornamental Plants

A scientometric study on application of electrochemical sensors for detection of pesticide using graphene-based electrode modifiers

Pesticide testing is an important topic in environmental protection and food safety. The development of green, accurate and reliable pesticide residue detection methods is an important technical support for implementing of agricultural quality supervision. Electrochemical sensors are a very promising analytical method for pesticide detection due to their high sensitivity, speed, low cost and portability. Performance enhancement of electrochemical sensors is often accompanied by research advances in materials science. Among them, carbon material is a very important electrode material for the fabrication of electrochemical sensors. The discovery of graphene makes it the most promising candidate among carbon materials for sensor performance enhancement. The topic of this review is the use of graphene-modified electrochemical sensors for pesticide detection in the last decade. Traditional literature summaries and bibliometric analyses were used for an in-depth analysis of this topic. In addition to the introduction of different sensor types and performance comparisons, this review also parses the authors' country, keywords and publication frequency. The related research experienced rapid growth several years ago and has now reached a relatively stable stage. We also discuss the perspectives on this topic.

Monitoring of Butylated Hydroxyanisole in Food and Wastewater Samples Using Electroanalytical Two-Fold Amplified Sensor

A high performance and fast response sensor was fabricated as a monitoring system for the determination of butylated hydroxyanisole (BHA) in food and wastewater samples. In this regard, a carbon paste electrode (CPE) that was amplified with platinum-decorated single wall carbon nanotubes (Pt/SWCNTs) and 1-Butyl-3-methylimidazolium chloride ([C4mim][Cl]) was investigated as a new electroanalytical sensor for the monitoring of BHA in aqueous solution. The [C4mim][Cl]/Pt/SWCNTs/CPE offered an excellent catalytic activity on oxidation signal of BHA and enhanced its oxidation current about 5.51 times. In the final step, the standard addition results confirmed the powerful ability of [C4mim][Cl]/Pt/SWCNTs/CPE to the monitoring of BHA in different water and food samples with acceptable recovery data.

Electrochemical determination of epirubicin in the presence of topotecan as essential anti-cancer compounds using paste electrode amplified with Pt/SWCNT nanocomposite and a deep eutectic solvent

Epirubicin (EP) and topotecan (TP) are two major anti-cancer compounds for the treatment of breast cancer with serious side effects. Hence herein, a carbon paste electrode (CPE) amplified with Pt/SWCNT nanocomposite and a deep eutectic solvent (CPE/DES/Pt-SWCNT) were proposed as an analytical tool for the monitoring of EP in the presence of TP in the real samples. Amplification of sensor was improve EP oxidation signal about 2.73 times. Under the optimized conditions, EP determined by using differential pulse voltammetry (DPV) technique with linear dynamic range of 0.001-500 μM with limit of detection (LOD) of 0.8 nM. The CPE/DES/Pt-SWCNT offered influential ability for monitoring of EP in injection and dextrose saline samples with a recovery range of 97.4%-104.9%.

Can Electrochemical Sensors Be Used for Identification and Phylogenetic Studies in Lamiaceae?

Electrochemical sensors have shown potential in recent years for plant species identification and phylogenetic studies. These works have been used to investigate the affinities of different species in many genera. However, the ability of electrochemical sensors to study relationships between different genera within a family has not been investigated. In this work, we selected 31 species in the Labiatae and 5 exotaxa as subjects to investigate the feasibility of electrochemical sensors at the genus level. The results show that electrochemical sensors are still very effective for the identification of these plants. Different pattern recognition techniques can make the identification more efficient. Also, the fingerprint profiles collected by the sensors can be used for phylogenetic studies of Labiatae. The phylogram divides all the species into five clusters, where the exotaxa are in one cluster. Species in the Labiatae are mainly distributed in four other clusters. Importantly, the different genera of species all showed close affinities, representing that electrochemical fingerprinting can well distinguish the affinities between the different genera. The results of this work demonstrate the great potential of electrochemical sensors in the study of plant phylogeny. Its application is not limited to the study at the species level, but can be extended to the genus level.

Evaluation of Peroxidase in Herbal Medicines Based on an Electrochemical Sensor

Peroxidases are species-specific. Differences in peroxidase can objectively reflect the genetics among species. The use of peroxidase to assist in species identification is relatively simple and effective. In this work, we proposed a graphene-modified electrode. This electrode can amplify the signal of electrocatalytic reduction of hydrogen peroxide. Since peroxidase can catalyze the reduction of hydrogen peroxide, this signal can be used as an indicator to demonstrate the content of peroxidase in different plant tissues. Twelve herbal medicines were selected for our study. The results show that this electrochemical-based detection technique was comparable to colorimetric method in terms of accuracy.