Water soluble fraction of yeast autolysale  Standard material for culture media Rich in B-Vitamins and growth factors. Assay (ex N on dried subs.) min 60.0% Phosphorus max 2.5% Coagulable protein not detectable Heavy metals(as Pb) max 0.005% Loss on drying max 5.0% Sulphated ash max 15.0% Suitability for microbiology passes test Heat resistant bacteria not detectable