Matareaswerereduced when yeasts were grown in YPD containing 0.1% glucose compared with 2% glucose and this result agrees with Reynolds and Fink (2001). Addition of catechin increased colony area for eight of the thirteen strains, and again Sc2621 exhibited the highest value. When a natural mix of polyphenols was present, three strains (Sc384, Sc1321, BY4742) increased the area colony compared to the previous conditions (Fig. 1c).