C7795

Chloramphenicol

γ-irradiated

• Synonym(s): D-(−)-threo-2,2-Dichloro-N-[β-hydroxy-α-(hydroxymethyl)-β-(4-nitrophenyl)ethyl]acetamide, D-(−)-threo-2-Dichloroacetamido-1-(4-nitrophenyl)-1,3-propanediol, D-threo-2,2-Dichloro-N-[β-hydroxy-α-(hydroxymethyl)-4-nitrophenethyl]acetamide, Chloromycetin
• Linear Formula: Cl₂CHCONHCH(CH₂OH)CH(OH)C₆H₄NO₂
• CAS Number: 56-75-7
• Molecular Weight: 323.13
• Beilstein: 2225532
• EC Number: 200-287-4
• MDL number: MFCD00078159
• UNSPSC Code: 12352200
• PubChem Substance ID: 24892989
• NACRES: NA.31

Properties

• Quality Level: 200
• sterility: γ-irradiated
• form: powder
• pKa: ~5.5
• mp: 149-153 °C (lit.)
• solubility: absolute ethanol: 5-20 mg/mL (as a stock solution); methanol: soluble (as a stock solution)
• antibiotic activity spectrum: Gram-negative bacteria; Gram-positive bacteria; mycobacteria; mycoplasma
• Mode of action: protein synthesis | interferes
• storage temp.: 2-8°C
• SMILES string: OC[C@@H](NC(=O)C(Cl)Cl)[C@H](O)c1ccc(cc1)[N+]([O-])=O
• InChI: 1S/C11H12Cl2N2O5/c12-10(13)11(18)14-8(5-16)9(17)6-1-3-7(4-2-6)15(19)20/h1-4,8-10,16-17H,5H2,(H,14,18)/t8-,9-/m1/s1
• InChI key: WIIZWVCIJKGZOK-RKDXNWHRSA-N
• Gene Information: human ... CYP1A2(1544)

Description

General description

Chemical structure: phenicole

Application

Chloramphenicol is a synthetic antibiotic, isolated from strains of Streptomyces venezuelae. It is often used for bacterial selection in molecular biology applications at 10-20 μg/mL and as a selection agent for transformed cells containing chloramphenicol reistance genes.

Biochem/physiol Actions

Mode of Action: Chloramphenicol inhibits bacterial protein synthesis by blocking the peptidyl transferase step by binding to the 50S ribosomal subunit and preventing attachment of aminoacyl tRNA to the ribosome. It also inhibits mitochondrial and chloroplast protein synthesis and ribosomal formation of (p)ppGpp, de-pressing rRNA transcription.

Mode of Resistance: Use of chloramphenicol acetyltransferase will acetylate the product and inactivate it.

Antimicrobial Spectrum: This is a broad spectrum antibiotic against gram-positive and gram-negative bacteria, and is used mainly for ophthalmic and veterinary purposes.

Caution

Stock solutions should be stored at 2-8°C and are stable at 37°C for 5 days. Aqueous solutions are neutral and stable over a wide pH range, with 50% hydrolysis occurring after 290 days. Use of a borax buffered solution reduces this number to 14%. Solutions should be protected from light as photochemical decomposition results in a yellowing of the solution. Heating aqueous solutions at 115°C for 30 minutes results in a 10% loss of chloramphenicol.

Preparation Note

Stock solutions can be prepared directly in the vial at any concentration in the recommended range. A solution at 50 mg/mL in ethanol yields a clear, very faint, yellow solution. Degradation of chloramphenicol in aqueous solution is catalyzed by general acids and bases. This rate of degradation is independent of the ionic strength and pH.

Other Notes

Keep container tightly closed in a dry and well-ventilated place. Light sensitive.

Safety Information

• Pictograms: GHS08,GHS05
• Signal Word: Danger
• Hazard Statements: H318,H351,H361fd
• Precautionary Statements: P202 - P280 - P305 + P351 + P338 - P308 + P313 - P405 - P501
• Hazard Classifications: Carc. 2 - Eye Dam. 1 - Repr. 2
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves