“…birrea has also received attention (Galvez et al, 1991;Galvez et al, 1992;Galvez et al, 1993;Hutchings et al, 1996;Kubo and Kinst-Hori, 1999), with recent research involving biochemical analyses ofthe active properties of different marula products and derivatives (e.g. Pretorius et al, 1985;Anderson et al, 1986;Fatope et al, 1993;Trovato et al, 1995;Mhlongo, 1997;Mugo.chi et al, 1999;Thiong'o et al, 2000). The bark of marula contains tannins and traces of alkaloids and therefore acts as an astringent and coagulant (Shone, 1979).…”