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| SUAREZ, W. T.; PESSOA NETO, O. D.; SANTOS, V. B. dos; NOGUEIRA, A. R. de A.; FARIA, R. C.; FATIBELLO-FILHO, O.; CHAMARRO, J. A.. |
| In this work, an analytical microsystem based on LTCC (low-temperature co-fired ceramic) technology with monolithic incorporation of an optical flow cell for determination of dipyrone in pharmaceuticals is described. The detection system is based on the formation of a blue chromophore between dipyrone and Fe(III) photometrically monitored at 630 nm using a lab-made LED mini-photometer constructed with a light emitting diode as a radiation source and a Si photodiode as a detector. The lab-made mini-photometer elaborated presented a good performance in regard to high signal/noise ratio, low drift and good sensitivity. The analytical curve was linear in the dipyrone concentration range from 1.0 × 10-4 to 3.5 × 10-3 mol L-1, limit of detection of 4.5 × 10-5... |
| Tipo: Artigo de periódico |
Palavras-chave: Low temperature; Co-fired ceramic; Analytical microsystems; Dipyrone; Flow injection; LED photometer. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/959237 |
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| Vong, Lilita; Laes, Agathe; Blain, Stéphane. |
| A new method for the non-specific determination of iron-porphyrin-like complexes in natural waters has been developed. It is based on the chemiluminescent oxidation of the luminol in the presence of dioxygen (O-2) at pH 13. The method has been implemented in a FIA manifold that allowed the direct injection of seawater. The limit of detection is 0.11 nM of equivalent hemin (Fe-protoporphyrin IX). Fe2+, Fe3+, H2O2, siderophore (deferoxamin mesylate), humic acid and phytic acid did not interfere when the), were present at the concentrations expected in seawater. Metal free porphyrin and Mg, Cu, Co porphyrin complexes did not induce a significant chemiluminescent signal. Poisoned unfiltered samples could be stored for several weeks before analyses. The new... |
| Tipo: Text |
Palavras-chave: Chemiluminescence; Complexation; Flow injection; Seawater; Porphyrin; Iron. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3298.pdf |
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