faintly orange to red-brown
1.7 (4-hydroxyl group)
7.9 (4-piperazine nitrogen)
H2O: 1.3 mg/mL (pH 4.3)
DMSO: 100 mg/mL
H2O: 2.5 mg/mL at 25 °C (pH 7.3)
chloroform: soluble 50 mg/mL
protein synthesis | interferes
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Acute Tox. 4 Oral - Eye Irrit. 2 - Lact. - Skin Irrit. 2 - STOT SE 3
11 - Combustible Solids
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The potency is determined from a microbiological assay (USP XXII) for antibiotics, a 2-level assay. The test organism is Bacillus subtilis ATCC 6633. The minimum dose is 4.0 μg/ml and the maximum dose is 8.0 μg/ml.
This product in its powder form is stable for short periods of time (i.e., the shipping process), at ambient temperature. For long term storage it is best to store it at -20°C.
Sigma-Aldrich offers several Rifampicin products, each tested and best suited for specific applications. The products range from a general use research grade to sterile powder, to plant culture tested. See individual products for specific details.
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