Tryptone (Casein Peptone), FMB Grade by Biologix is a light yellow, readily soluble powder rich in nitrogen and amino acids for preparing LB and other microbial culture media. Total nitrogen is at least 12.0%, amino nitrogen at least 4.0% and pH 6.0–7.0, with clear solutions and no precipitate. 500 g bottles, 36-month shelf life at 2–30 °C.