Composition of Yeast Nitrogen Base (YNB)

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Yeast Nitrogen Base (YNB), per liter

  • Biotin 2 μg
  • Calcium pantothenate 400 μg
  • Folic acid 2 μg
  • Inositol 2000 μg
  • Niacin 400 μg
  • p-Aminobenzoic acid 200 μg
  • Pyridoxine hydrochloride 400 μg
  • Riboflavin 200 μg
  • Thiamine hydrochloride 400 μg


  • Boric acid 500 μg
  • Copper sulfate 40 μg
  • Potassium iodide 100 μg
  • Ferric chloride 200 μg
  • Manganese sulfate 400 μg
  • Sodium molybdate 200 μg
  • Zinc sulfate 400 μg


  • Potassium phosphate monobasic 1 g
  • Magnesium sulfate 500 mg
  • Sodium chloride 100 mg
  • Calcium chloride 100 mg


  • Final pH 4.5 before addition of Ammonium sulfate (5 g/liter)
  • Final pH 5.4 after addition of Ammonium sulfate (5 g/liter)


  • Difco 0919-15 Yeast nitrogen base w/o amino acids 100g
  • Difco 0335-15 Yeast nitrogen base w/o amino acids and ammonium sulfate 100g