Occurrence and sensory perception of Z-2-(β-d-glucopyranosyloxy)-3-phenylpropenoic acid in rooibos (Aspalathus linearis)

► Z-2-(β-d-Glucopyranosyloxy)-3-phenylpropenoic acid (PPAG) was isolated and identified. ► PPAG was not present in all Aspalathus linearis plant material. ► PPAG in water has a slightly bitter to astringent taste. ► Detection threshold for PPAG in water is 0.4 mg/l.