Fluorescent sensors surfactants

An, Y Bai, H. Li, C. Shi, G. Disassembly-driven colorimetric and fluorescent sensor for aiuoiuc surfactants in water based on a conjugated polyelectrol54e/dye complex. Soft Matter 2011, 7, 6873-6877. 

Fluorescent molecular sensors of neutral molecules and surfactants... 

Sensor fabrication occurs in two steps. The first step is the immobilization of GOx on the surface of the nanotube. This is accomplished by adding GOx to a solution of surfactant stabilized nanotubes and dialyzing away the surfactant. Dialysis is an ideal method for assembling enzymes on a nanotube surface, because the method allows retention of enzyme activity while simultaneously maintaining nanotube colloidal stability. The resulting GOx-S WNT solution exhibits a shift in the nanotube fluorescence indicative of the enzyme layer being less tightly packed around the nanotube than the surfactant layer. The second step is addition of ferricyanide to the GOx-SWNT solution. Adsorption of ferricyanide to the nanotube surface... 

A biosensor has been demonstrated based on acrylodan-labeled bovine serum albumin immobilized on a silica optical fiber. The fluorescence behavior of the sensor changes in the environment of ionic surfactants. It was shown to be elfective in the 5-60 micromolar surfactant range (107). 

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