Yeast Nitrogen Base (YNB)May be used to test carbon assimilation in the presence of a carbon source like glucose, galactose, or raffinoseBased upon the formulation of Yeast Agar except that Ammonium Sulfate is the sole nitrogen source and that addition of carbon source is requiredpH: 5.4Dehydrated Appearance: off-white, homogeneous powderPrepared Appearance: colorlessSoluble in water with agitationContains:Ammonium Sulfate L-Histidine MonohydrochlorideLD-Methionine LD-Tryptophan Biotin Calcium PantothenateFolic Acid Inositol Niacinp-Aminobenzoic AcidPyridoxine HydrochlorideRiboflavinThiamine Hydrochloride Boric Acid Copper Sulfate Potassium Iodide Ferric Chloride Manganese Sulfate Sodium Molybdate Zinc Sulfate Monopotassium Phosphate Magnesium Sulfate Sodium Chloride Calcium Chloride