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Two electrochemical sensors were proposed for the determination of L‐tyrosine from pharmaceutical capsules. The electrochemical sensors were based on plain graphite paste and chitosan modified graphite paste. Working conditions, e. g. pH, supporting electrolytes have been optimized. The results revealed for both electrodes very low limits of quantification (LOQ) (0.18 mg L−1 and 0.0018 mg L−1) for...
A simple, sensitive and selective fluorimetric method for the determination of trace amounts of nitrite in different water samples (e.g., underground water, geothermal waste water, domestic waste water and drinking water) was proposed. The fluorimetric determination is based on the diazotization reaction of nitrite with a fluorescent dye, tetraamino zinc (II) phthalocyanine in an acidic medium. Under...
Phthalocyanines and metallophthalocyanines play 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-, and sequential-injection analysis and microfluidic systems the role of phthalocyanines and metallophthalocyanines is centered as either that of analyte or that...
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