Fig. 1From: Anti-dengue virus serotype 2 activity of tannins from porcupine datesFTIR spectra of a BDTF, b PDTF and c ST tannic acid. Finely ground sample powder was placed on the diamond ATR crystal of the FTIR spectrometer. Pressure was applied to the sample with 80 N force. The spectra represent the average of 15 scansBack to article page