Raluca Ioana Stefan-van Staden

Flow-injection analysis systems with different detection devices and other related techniques for the in vitro and in vivo determination of dopamine as neurotransmitter. A review.

Dopamine (DA) is one of the most important catecholamine neurotransmitters in the human central nervous system in the brain and plays a key role in the functioning of the renal, hormonal, and cardiovascular systems. Abnormal levels of dopamine are related to neurological disorders, such as schizophrenia and Parkinsons disease and the control and fluctuations of the amount of dopamine are extremely important in monitoring with analytical systems in the human brain. This review covers the attributes of flow-injection analysis systems with different detection devices and other related techniques for the in vitro and in vivo determination of dopamine as neurotransmitter and points out the advantages and disadvantages in the implementation thereof.

Application of porphyrins in flow-injection analysis: A review

Porphyrins and metalloporphyrins fulfil a very important role in the metabolism of living organisms through biological pigments or biochromes and are therefore also employed in numerous applications in analytical chemistry. In flow-injection analysis the role of porphyrins and metalloporphyrins are centered as either that of analyte or that of a reagent or modifier in the determination of other species. This paper covers the attributes of porphyrin and metallophorphyrin complexes as enhancements in chemical analysis in flow-injection systems and points out the advantages and disadvantages in the implementation thereof.

Wireless Electrochemical Sensors: A Tool for Process Control Past, Present and the Future

Wireless sensors are widely used in analytical chemistry. Their utilization in control will make the feed-back of the quality of processes in real time possible followed by immediate remediation of the problems regarding quantity and quality of by-products and final products. The mini review will outline the current situation in interactive-intelligent-real-time process technology with remote on-site wireless sensors as well as giving aspects of the historical background of process and process control from wired to wireless.

Retracted article: A new sensor for the assay of breast cancer antigen

We, the authors Raluca-Ioana Stefan-van Staden, Ileana Stefanescu, Jacobus F. van Staden and Marius Enachescu, hereby wholly retract this Analyst article. Due to confidentiality reasons and possible conflict of interest we cannot provide at this stage more data to support the conclusions of the article. Signed: R. I. Stefan-van Staden, J. F. van Staden, National Institute of Electrochemistry and Condensed Matter, Bucharest, Romania, and I. Stefanescu, M. Enachescu, University “Politehnica” Bucharest, Romania. This retraction is endorsed by May Copsey, Editor. Retraction published 6th September 2012. Editor’s Note: Significant concerns have been received from members of the community regarding the extent of the conclusions that have been drawn in the above Analyst article based on the data presented in the article. May Copsey, Editor.