Infrared spectroscopy is suggested as a diagnostic method for the characterisation and qualitative estimation of the two classes of tannins. Gallic acid, tannic acid and chebulinic acid have been taken as model compounds for the hydrolysable and catechin for the condensed tannins. The former class is marked by the presence of strong absorption maxima at 1710 – 35 cm −1 . The two classes have characteristic pattern of absorption, from which it is possible to characterise the particular type of tannin.
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Arshad et al. (1969) studied this question.
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