Fourier Transfer Infrared Spectrum FTIR

An interface between gel permeation chromatography (GPC) and Fourier transform infrared (FTIR) spectrometry has been developed. With this system it is possible to collect solvent free polymer deposition and to measure their infrared spectra as a function of molecular weight. The mobile phase from the GPC effluent is converted into an aerosol and removed using a pneumatic nozzle. The sample is collected on a Ge disc that rotates below the nozzle. After the sample is collected, the disc is transferred to an FTIR spectrometer where the infrared spectrum of the sample is collected. Normal GPC sample concentrations (0.1-0.25 wtJvol%) give sufficient sample for useable FTIR signals. All normal GPC solvents can be effectively removed, and the interface works with both low temperature and high temperature GPC applications. 

Fourier transform infrared reflectance spectrum (FTIR) results indicate that AChE was immobilized successfully on the MWCNT/PDDA surface. CV results show that electrooxidation of thiocholine occurs at a much lower oxidation potential +0.55 V at MWCNT/GCE and the electrooxidation current is ten times higher than that of bare GCE. In addition, amperometric results show that the response of thiocholine at MWCNT/GCE was 200 times more than that of bare GCE. This significant enhancement in the anodic oxidation current of the enzymatic product thiocholine can be attributed to the fast electron transfer and... 

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