Tannin concentrations in freeze?, oven? and room?temperature?dried samples of leaves of Eulalia villosa Thunb. (Nees), as well as undried material stored at ?70°C, were determined in order to compare the effect of different preservation methods on the tannin levels measured. The highest concentrations of tannin were monitored in leaves which had been freeze?dried and dried at room temperature. Air?drying plant material at lower temperatures may be a suitable option for field studies where laboratory facilities are limited. However, air?drying may result in increased polymerization with the production of polymers too large to precipitate proteins, while oven?drying leads to severe inactivation of tannin bringing about a decrease in condensed tannin levels.
Journal articles from the Grassland Society of Southern Africa (GSSA) African Journal of Range and Forage Science as well as related articles and reports from throughout the southern African region.