stilbenes and aniline

In this study, a nano-structured copolymer of luminol/aniline (PLA) was deposited onto nano-TiO2-functionalised indium tin oxide (ITO)-coated glass by electrochemical polymerisation using cyclic voltammetry (CV). The resulting reagentless electrochemiluminescent (ECL) electrode (ECLode) can be used for flow injection analysis (FIA). The properties of the ECLode were characterised by CV, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The ECLode has high background ECL emission as well as excellent stability and reproducibility, and yielding sensitive response towards target analytes. The ECL emissions of the ECLode were 50 times higher than PLA/ITO, and 500 times higher than polyluminol (PL)/ITO. The ECLode showed sensitive responses to reactive oxygen species (ROSs), permitting its application for determination of antioxidants by quenching. Under optimised conditions, an absolute detection limit of 69.9 pg was obtained for resveratrol, comparable to the highest levels of sensitivity achieved by other methods. Thus, the gross antioxidant content of red wine was determined, with satisfactory recoveries between 87.6% and 108.3%. These results suggest a bright future for the use of the ECLode for single-channel FIA due to its high sensitivity, accuracy and reproducibility.

Topics: Aniline Compounds; Antioxidants; Electrochemical Techniques; Electrochemistry; Electrodes; Flow Injection Analysis; Glass; Indium; Luminescence; Luminol; Microscopy, Electron, Scanning; Molecular Structure; Polymers; Reactive Oxygen Species; Reproducibility of Results; Resveratrol; Stilbenes; Tin Compounds; Titanium; Wine

New enantiopure aniline-containing amino alcohols are directly derived from trans-(R,R)-2-(2-nitrophenyl)-3-phenyloxirane, by alternative regioselective double reductions. Subsequent selective alkylation procedures and derivatizations provide a rapid and high-yielding access to different chiral ligands, bases, and benzoxazines, without loss of optical purity.

Topics: Amino Alcohols; Aniline Compounds; Benzoxazines; Epoxy Compounds; Ligands; Molecular Conformation; Stereoisomerism; Stilbenes

Topics: Aniline Compounds; Animals; Coloring Agents; Histamine; Mast Cells; Peritoneum; Protamines; Rats; Stilbenes