Interaction of dipicolinic acid with water-soluble and immobilized porphyrins

Detection of organics using porphyrin embedded nanoporous organosilicas

“…When excited at 400 nm, the fluorescence emission spectrum of CTPP is sensitive to TNT with increasing concentrations yielding increasing difference intensities. When plotted as peak intensity (645 nm) minus trough intensity (675 nm), the changes in the fluorescence characteristics of CTPP upon exposure to the various compounds showed half-hyperbolic dependence on concentration as expected (Connors, 1987;White and Harmon, 2004).…”

“…PMO-A specific surface area = 157 m 2 /g; PMO-B specific surface area = 144 m 2 /g. on previously published work (Awawdeh et al, 2003;Kibbey and Meyerhoff, 1993;White and Harmon, 2004). Reflectance and fluorescence experiments indicate a lower concentration of porphyrin per square meter in the imprinted PMO (PMO-B) as compared to the non-imprinted PMO (PMO-A).…”

“…The bands comprising the emission spectrum are more distinctly separated and the ratio of their intensities is different from that of the porphyrin in solution. The change in porphyrin spectrophotometric characteristics upon immobilization has been well documented (Awawdeh et al, 2003;Kibbey and Meyerhoff, 1993;White and Harmon, 2004). The difference spectra presented in Fig.…”

“…These changes are more intense than the trends observed for PMO-B upon exposure to TNT. The dependence on concentration of the changes in PMO-A and PMO-B spectra do not follow one of the simple binding models (Connors, 1987;White and Harmon, 2004). Exposure of PMO-B materials to TNT and RDX in artificial sea water resulted in changes in the fluorescence excitation and emission spectra identical to those resulting from exposure to the analytes in deionized water with the exception that the intensities were reduced by approximately 30% for TNT and 50% for RDX.…”

Spectrophotometric detection of organophosphate diazinon by porphyrin solution and porphyrin-dyed cotton fabric

“…Without the presence of enzymes, porphyrins also have spectral shifts when bound with other chemicals [12,13]. This property of porphyrin was used in detection protocols for cyanide [14], amino acids [15], dipicolinic acid [16] and pentachlorophenol [17]. The first objective of this study is to investigate OP detection by porphyrin in the absence of enzymes.…”