Revista Brasileira de Farmacognosia
On-line version ISSN 1981-528X
MONTEIRO, Júlio M. et al. The effects of seasonal climate changes in the caatinga on tannin levels in Myracrodruon urundeuva (Engl.) Fr. All. and Anadenanthera colubrina (Vell.) Brenan. Rev. bras. farmacogn. [online]. 2006, vol.16, n.3, pp. 338-344. ISSN 1981-528X. http://dx.doi.org/10.1590/S0102-695X2006000300010.
The influence of seasonal climatic changes on tannin concentrations was examined in two caatinga (semi-arid) plant species (Myracrodruon urundeuva (Engl.) Fr. All. and Anadenanthera colubrina (Vell.) Brenan). The Folin-Ciocalteau method was used to quantify total phenols, and the casein precipitation method was used for tannins. In general, there is a close relationship between tannin levels and rainfall, although species seem to adopt different strategies of tannin compound production in response to periods of drought and rainfall in the caatinga.
Keywords : Dry forest; Folin-Ciocalteau; medicinal plant; semi-arid.