A spectrofluorimetric method to determine tacrine is proposed and applied to the determination of tacrine in human serum and pharmaceuticals. The fluorimetric method allows the determination of 1-70 ng ml-1 of tacrine in aqueous solutions containing acetic acid-sodium acetate buffer (pH 5.6) with lambda exc = 242 nm and lambda em = 362 nm.

Prochlorococcus marinus strain CCMP 1375 is the sole prokaryote to possess phycoerythrin in addition to (divinyl-)chlorophyll a/b binding antenna complexes. Here we demonstrate, employing a spectrofluorimetric assay, that phycoerythrin serves a light-harvesting antenna function (transfers energy to chlorophylls).

The synthesis, characterisation, and crystallographic analysis of a novel -OH functionalised Ni-Salphen complex its hybrid nanomaterial counterparts in the form molecule covalently bonded to Edge-Oxidised Graphene Oxide are described. Spectrophotometric titrations performed against different pyridine-based guests showed constant stoichiometry association but trends constants upon grafting. Thes...

As an alternative to electrophysiological procedures, fluorescent probes have been widely used to assess modifications in the plasma membrane potential (PMP) of living cells, mostly via spectrophotometric or spectrofluorimetric analysis of samples of suspended cells. Another suggested procedure for the quantitative study of PMP changes using fluorescent probes utilizes confocal microscopy and i...

New simple spectrofluorimetric method with enhanced sensitivity has been developed and validated for the determination of the antidepressant paroxetine (PXT) in its dosage forms and plasma. The method was based on nucleophilic substitution reaction of PXT with 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole in an alkaline medium (pH 8) to form a highly fluorescent derivative that was measured at 545 nm...

A method based on the ultrasound-assisted solidification of floating drop microextraction technique was developed for the spectrophotometric and spectrofluorimetric determination of curcumin in turmeric powder. In this work a small volume of an organic solvent was floated on the surface of an aqueous solution. After sonication the organic solvent is solidified and separated. The effect of extra...