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A Local Weighted Nearest Neighbor Algorithm and a Weighted and Constrained Least-Squared Method for Mixed Odor Analysis by Electronic Nose Systems
Sensors 2011, 11(1), 886-904; doi:10.3390/s110100886

Porphyrin-Embedded Silicate Materials for Detection of Hydrocarbon Solvents

* ,
Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA
* Author to whom correspondence should be addressed.
Received: 1 December 2010 / Revised: 5 January 2011 / Accepted: 13 January 2011 / Published: 14 January 2011
(This article belongs to the Special Issue Direct and Indirect Sensing of Odor and VOCs and Their Control)
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The development of porphyrin-embedded mesoporous organosilicate materials for application to the detection of volatile hydrocarbon solvents is described. Design of the receptor and optical indicator construct begins with parallel selection of the porphyrin indicator and design of the mesoporous sorbent. For the porphyrin indicator, high binding affinity and strong changes in spectrophotometric character upon target interaction are desired. The sorbent should provide high target binding capacity and rapid binding kinetics. A number of porphyrin/metalloporphyrin variants and organosilicate sorbents were evaluated to determine the characteristics of their interaction with the targets, benzene, toluene, and hexane. The selected porphyrin candidates were covalently immobilized within a benzene-bridged sorbent. This construct was applied to the detection of targets using both fluorescence- and reflectance-based protocols. The use of red, green, and blue (RGB) color values from the constructs in a highly simplified detection scheme is described.
Keywords: mesoporous; organosilica; fluorescence; porphyrin; hierarchical; detection; solvent mesoporous; organosilica; fluorescence; porphyrin; hierarchical; detection; solvent
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Johnson, B.J.; Anderson, N.E.; Charles, P.T.; Malanoski, A.P.; Melde, B.J.; Nasir, M.; Deschamps, J.R. Porphyrin-Embedded Silicate Materials for Detection of Hydrocarbon Solvents. Sensors 2011, 11, 886-904.

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