Technical Data
Yeast Nitrogen Base w/o AA, AS, Thiamine HCl (YNB, Powder)
Molecular Biology Grade
Storage RT/4°C    Shipping RT
Components per Liter
p-Aminobenzoic acid200ug
Folic Acid2ug
D-Pantothenic Acid•Ca400ug
Amino acids:
Trace Elements:
Boric Acid500ug
Copper Sulfate40ug
Ferric Chloride200ug
Manganese Sulfate400ug
Potassium Iodide100ug
Sodium Molybdate200ug
Zinc Sulfate400ug
Inorganic Salts:
Calcium Chloride0.1g
Magnesium Sulfate0.5g
Potassium Phosphate Mono1g
Sodium Chloride0.1g
Total: 1.71g/L
25g makes 14.7 liters
Yeast Nitrogen Base (YNB) media have been prepared according the formulae of Wickerham (1943-51) and Burkholder (1943). Their research on the nutritional requirements of yeast strains resulted in the formulation of YNB. YNB is a well defined composition of salts, vitamins, amino acids and a nitrogen source for a vigorous growth of Sacharomyces cerevisiae.

Thiamine HCl is omitted from this formulation of YNB without Amino Acids to provide the researcher the possibility to grow yeast cells in the absence of thiamine or to replace this vitamin.

Ammonium sulfate, as a source of Nitrogen, has been omitted to test the ability of yeast cells to assimilate different nitrogen sources like Potassium nitrate.

Application: For carbon assimilation tests in the characterization and identification of yeasts. Suitable for use in S. pombe research.

Note: The addition of a carbon source like glucose, galactose or raffinose is required.

Directions per Liter: Dissolve 1.71 g in 800-900ml of ddH2O, stirring gently until completely solubilized. Adjust pH of the medium to the desired level. Add additional water to bring the solution to1L Filter-sterilize using a 0.22 micron membrane filter. Aliquot into sterile containers. Do not autoclave. Contains heat-labile compounds that can be damaged with autoclaving.

Storage and Stability: Store powdered media at RT. Opened bottles should be capped tightly and kept in a dark, low humidity environment. Prepared media should be kept at 4°C and used within a short period of time.

Appearance: White to off-white, homogeneous, free-flowing powder

Solubility: Colorless to pale yellow, clear, complete

pH: As reported

Important Note: This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

1. Difco Manual Tenth Edition, pp.1136-1141(1984). 2. Ronald M. Atlas, Handbook of Microbiological Media, Lawrence C. Parks, ed., CRC Press (1993)