# 699: TRIPLE-SUGAR-IRON MEDIUM (Difco) ## Main sol. 699 3 g Bacto beef extract 3 g Yeast extract (Bacto ) 15 g Bacto peptone 1 g Dextrose 10 g Lactose 10 g Sucrose 0.2 g FeSO4 5 g NaCl 0.3 g Na2S2O3 0.024 g Phenol red 12 g Agar, if required 1000 ml Distilled water 1. pH 7.4