Low-temperature filter paper phosphorescence

A fluorescence optosensor for analyzing naphazoline in pharmaceutical preparations

“…Capillary electrophoresis [8][9][10] and atomic absorption and emission [11] methods have also been published. NPZ presents intrinsic fluorescence and phosphorescence emission, thus different luminescence methods have been developed for its determination [12][13][14][15]. All of them present too many complications for routine lab use.…”

Comparison of three different phosphorescent methodologies in solution for the analysis of naphazoline in pharmaceutical preparations

“…NPZ has native phosphorescence and four phosphorimetric methods have been described. Among these, one was developed on filter paper (λ ex/em =290/485, 520 nm) [36] and the others were proposed by our research group [11,37].…”

Investigations of a new sample compartment assembly for low-temperature and room-temperature solid substrate phosphorimetry

“…Several researchers have shown that in certain cases lowering the temperature of the analyte adsorbed on the filter paper increases the phosphorescence intensity and thus enables an improvement in the limit of detection (12,32,33). McCall and Winefordner (33) found that low-temperature measurements affect each compound in a different way, e.g., the intensity enhancement for trytophane was 2.4X and the improvement of the limit of detection (LOD) at low temperature was 1.7X; however, in the case of 6-methylmercaptopurine the intensity enhancement was 84 X, and the LOD at 90 K was 8X better than the LOD at room temperature.…”