By Hari Singh Nalwa, Foreword by Richard E. Smalley
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Example text
When quantification is considered the class-membership function turns out to be a vectorial function defined in a metric space. In the case of quality recognition, the class membership is an ensemble of 39 Porphyrin-Based Chemical Sensors abstract sets to which each measured sample is assumed to belong. In the first case we prefer to talk of multicomponent analysis while the term pattern recognition is usually referred to for the second case. Mathematically, a pattern is a vector belonging to its own vector space.
Reprinted with permission from [89], T. , Eur. Surg. 34, 79 (2002). © 2002, Blackwell. 32 Porphyrin-Based Chemical Sensors Table 4. Porphyrin-based NO sensors. Porphyrin NiTHMPP CoTPPCl MnTCPPCl Ru(bipy) 2Cl N Detection limit (Nmol/L) Additional layer 10 15 27 85 1 05 12 100 Ref. Nafion® [86] [88] Nafion® + o-PD [95] eugenol [94] [89] Nafion®, AAO, [96] polylisine Nafion® [88] Poly-pyrrole [88] complexes the coordination of NO to the metalloporphyrin is probably not involved in the electrocatalytic process [91].
To overcome the problem of the sensing element leaching, the same group developed a polymeric matrix with a covalently bound porphyrin [48]. The polymeric matrix was a hydroxyethyl substituted PMMA, deposited onto a PMMA disk. The change of absorption spectra after metal coordination was exploited to develop the optical sensor. Cd(II) and Hg(II) ions were the target analytes and a detection limits of 63 and 20 g/L were obtained respectively for these ions, with a response time of 10 min. The different ions can be easily discriminated because they have different absorption bands and for this reason a simultaneous determination is possible.