Applications of Metal Complexes Dyes in Analytical Chemistry

Trace elements, especially heavy metals, are considered to be one of the main sources of pollution in the environment since they have a significant effect on ecological quality. Commonly, the analytical methods for the determination of trace metals are the spectrometry techniques. While, the electroanalytical methods are recognized as a powerful technique for trace metals owing to its remarkable sensitivity, relatively inexpensive instrumentation, ability for multi-element determination at trace and ultra trace level. New alternative electrode materials are highly desired to develop sensitive stripping sensors for meeting the growing demands for on-site environmental monitoring. Dyes aromatic heterocyclic compound, used in food, textile and cosmetic industries has been used for spectrophotometric determination of metals. In electrochemitry, methods for metals determination based on their complexation with dyes were proposed. In this chapter, a brief summary of spectrometry methods and electrochemical sensors for heavy metals detection based on the formation of metals dyes complexes is presented

Les polymères conducteurs

Les polymères conducteurs ont ouvert grâce à leurs propriétés physico-chimiques et électrochimiques très intéressantes, de nouvelles perspectives dans le domaine des matériaux et dans celui des électrodes modifiées. Grâce à leurs propriétés mécaniques extraordinaires, leur résistance à la corrosion, leur faible coût, les polymères ont pu compléter les matériaux métalliques. Ils peuvent être synthétisés par voie chimique ou électrochimique et sont utilisés dans différents domaines de la vie quotidienne allant de l’objet le plus simple aux secteurs les plus pointus

Graphite electrode modified with Indigo Carmine for Cu(II) ions detection

An electrochemical method for Cu(II) determination, based on its reaction with indigo carmine (IC) in alkaline medium and differential pulse voltammetry performed at graphite electrode, was elaborated. The experimental parameters affecting the Cu(II) - IC complex formation (reaction time and pH) were optimized. The linear range of the calibration curve, obtaining by representing the IC oxidation current (Eappl = 0.175 V vs. Ag/AgCl,KClsat) versus the Cu(II) concentration (pH 10), was from 10 μM up to 70 μM Cu (II) and the detection limit was 4.74 μM

Molecular characterization of African Swine fever viruses in Burkina Faso, Mali, and Senegal 1989–2016

International audienceAfrican swine fever (ASF) has been endemic in sub-Saharan Africa since the 1960s. Following its introduction in Senegal, in 1957, ASF steadily progressed through West Africa, reaching Burkina Faso in 2003, and later Mali in 2016. Despite the heavy burden of disease on pig production, little information is available on the genetic diversity of Africa swine fever virus (ASFV) in Burkina Faso, Mali and Senegal. Here, we used real-time PCR ASFV to detect the ASFV genome in samples collected between 1989 and 2016, in Burkina Faso, Mali and Senegal, and conventional approaches for isolate characterization. The C-terminal end of the p72 protein gene, the full E183L gene and the central variable region (CVR) within the B602L gene in ASFV genome were sequenced and compared to publicly available sequences. ASFV genome was found in 27 samples, 19 from Burkina Faso, three from Mali and five from Senegal. The phylogenetic analyses showed that all viruses belong to genotype I, with the ASFVs from Burkina Faso and Mali grouping with genotype Ia and ASFV serogroup 4, and those from Senegal with genotype Ib and the ASFV serogroup 1. The analysis of the CVR tetrameric tandem repeat sequences (TRS) showed four TRS variants in Burkina Faso, two in Senegal and one in Mali. The three countries did not share any common TRS, and all CVRs of this study differed from previously reported CVRs in West Africa, except for Senegal. Three of the five isolates from Senegal fully matched with the CVR, p72 and p54 sequences from ASFV IC96 collected during the 1996 ASF outbreak in Ivory Coast. This study shows the spread of the same ASFV strains across countries, highlighting the importance of continuous m;onitoring of ASFV isolates. It also calls for an urgent need to establish a regional plan for the control and eradication of ASF in West Afric