How Do You Make a 5 Mcfarland Standard
Mixing the Two Compounds Forms a Barium Sulfate Precipitate, Which Causes Turbidity in the Solution. a 0.5 Mcfarland Standard Is Prepared by Mixing 0.05 mL of...
Mixing the two compounds forms a barium sulfate precipitate, which causes turbidity in the solution. A 0.5 McFarland standard is prepared by mixing 0.05 mL of 1.175% barium chloride dihydrate (BaCl2•2H2O), with 9.95 mL of 1% sulfuric acid (H2SO4).
How McFarland standards are made?
McFarland turbidity standards are prepared by mixing various volumes of 1% sulfuric acid and 1% barium chloride to obtain solutions with specific optical densities. 0.5 McFarland turbidity standard provides an optical density comparable to the density of a bacterial suspension 1.5x 10^8 colony forming units (CFU/ml).
What is the OD of 0.5 McFarland standard?
Tips for Using McFarland Standards A McFarland standard of 0.5 should have an OD600 between about 0.08 and 0.1 but you will have to determine this relationship for your particular spectrophotometer.
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