Middle infrared (ATR FT-MIR) characterization of industrial tannin extracts

In the present paper a detailed investigation of the molecular vibrations of eight industrial tannin powder extracts is presented. The ATR FT-MIR spectra observed in the spectral window between 1800 and 600 cm−1 allow specific band profiles to be identified which are typical for the various hydroxyl-aromatic molecules that constitute the tannin extracts. Hence, it was possible to rapidly discriminate the two main families of tannin. The...