|
M29a
Abeyta-Hunt Bark Agar
Heart infusion agar (Difco) | 40 g |
Yeast extract | 2 g |
Distilled water | 950 ml |
Autoclave 15 min at 121°C. Final pH, 7.4 ± 0.2. Cool and add sodium cefoperazone (6.4 ml if using broth preparation or 4 ml of the agar preparation[below]), 4 ml rifampicin, 4 ml amphotericin B, and 50 ml lysed horse blood.
After pouring plates, dry plates overnight on bench.If plates must be used the same day, place them in 42°C incubator for several hours. Do not dry in a hood with lids open. Even very brief surface drying will inhibit campylobacter growth.
Sodium cefoperazone. Prepare as described for broth for final
concentration of 32 mg/liter, adding 6.4 ml to agar. OR dissolve 0.8 g in
100 ml water in a 100 ml volumetric flask, filter and add 4 ml to agar.
Rifampicin. Dissolve 0.25 g slowly into 60-80 ml alcohol in a 100 volumetric, swirling repeatedly. When powder is dissolved completely, bring to the line with distilled water. Store up to 1 year at -20°C. Final concentration is 10 mg/liter.
Amphotericin B, solubilized (Sigma Cat. No. A9528). Dissolve 0.05 g in water in a 100 ml volumetric flask and bring to the line. Filter sterilize and store at -20°C for 1 year. Final concentration is 2 mg/liter. Add 4 ml per liter.
Note: FBP is light sensitive and absorbs oxygen rapidly. Prepare only the amount needed. 10-25 ml amounts can be filtered with a 0.22 µm syringe filter. Freeze unused portions in 5 ml amounts at -70°C as soon as possible after preparation. It can be stored at -70°C for 3 mos or -20°C for 1 mo.
Hypertext updated by rim/cjm 2005-OCT-21