DSC and FTIR Testing
3-Day Turnaround
Instant Ordering
Fourier Transform Infrared Spectroscopy
The FTIR generates a spectrum of absorption bands between 4000 and 400 wavenumbers. Absorbances in the region between 4000 and 1500 are usually associated with functional organic groups such as hydroxyl (OH), carbonyl (C=O), amino (NH) or mercaptan (SH) etc. The fingerprint region of the spectrum lies between 1500 and 400 wavenumbers. Here, intra-molecular phenomena predominate that are highly specific for each material giving rise to unique spectra and a “fingerprint” useful for identification purposes.
Once the presence of an ingredient is established, then Quantitative Analyses can be performed where the FTIR of a series of mixtures are scanned with the suspect ingredient present at known but different percentages. When compared to the unknown mixture, the peaks would tend to be in the same position but the extent of the absorbance would change as the concentration of the ingredient is varied. The process is iterated until absorbance position and extent coincide.
