A procedure for the enzymatic determination of lecithin and sphingomyelin in aqueous solution is described. The phospholipids are first dissolved in chloroform:methanol (2:1 by vol), the solvent is evaporated, and the residue is redissolved in an aqueous zwitterionic detergent solution. The enzymatic reaction sequences of both assays involve hydrolysis of the phospholipids to produce choline, w...

Abstract Phenolic compounds are widespread water contaminants with high toxicity and chronic carcinogenicity, whose concentration is restricted by a variety of quality regulations. In the present study, we developed tyrosinase biosensor based on nanocomposite carbon nanotubes, nanodiamonds, soluble starch to enhance sensing performance during practical application. Doping nanodiamonds in consid...

This work studies the chlorination and monochloramination reaction kinetics of two phenazone-type drugs (phenazone – Phe propyphenazone PrPhe) three metabolites (4-formylaminoantipyrine FAA, 4-aminoantipyrine - AA 4-acetoamidoantipyrine AAA). Kinetics were faster with chlorine (apparent second-order constants between 100 66,500 times higher) than monochloramine. For FAA AAA, no significant was ...