title: Porphyrin-embedded silicate materials for detection of hydrocarbon solvents.
abstract: 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.
authors.affiliation: Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA. brandy.white@nrl.navy.mil
authors.forename: Brandy J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: Nicole E
authors.initials: NE
authors.lastname: Anderson
authors.forename: Paul T
authors.initials: PT
authors.lastname: Charles
authors.forename: Anthony P
authors.initials: AP
authors.lastname: Malanoski
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Melde
authors.forename: Mansoor
authors.initials: M
authors.lastname: Nasir
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Deschamps
mesh_terms: D008823:Micelles; D016062:Porosity; D011166:Porphyrins / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012997:Solvents / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents / Q000737:chemistry; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D008823:Micelles; D011166:Porphyrins; D017640:Silicates; D012997:Solvents; D013501:Surface-Active Agents; D055549:Volatile Organic Compounds