B158

D NASE TEST AGAR BASE 

Formula 

B158 

Ingredients 

gms/lit.

Casein enzymic hydrolysate 

Papaic digest of soyabean meal 

Deoxyribonucleic acid (DNA) 

Sodium chloride 

Agar 

15.00 

5.00 

2.00 

5.00 

15.00 

Final pH (at 25 C) : 7.3 + 0.2

Directions 

Suspend 42 gms. of B158 in 1000 ml. distilled water. Heat with frequent agitation to dissolve the medium completely. Sterilize by autoclaving at 12 to 15 lbs pressure (118°C to 121°C) for 15 minutes. Cool to 45°C and pour into sterile petriplates. Add 0.1 gm. Toluidine Blue (BF045) to (B158) before sterilizing the medium or flood the plates with 0.1% Toluidine Blue after incubation as desired

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