A9518 Sigma-Aldrich

Ampicillin sodium salt

Synonym: D-(−)-α-Aminobenzylpenicillin sodium salt

  • CAS Number 69-52-3

  • Empirical Formula (Hill Notation) C16H18N3NaO4S

  • Molecular Weight 371.39

  •  Beilstein Registry Number 4119211

  •  EC Number 200-708-1

  •  MDL number MFCD00064313

  •  PubChem Substance ID 24891463


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Used to select for ampicillin resistance in mutated and transformed cells.

Biochem/physiol Actions

A β-lactam antibiotic with an amino group side chain attached to the penicillin structure. Penicillin derivative that inhibits bacterial cell-wall synthesis (peptidoglycan cross-linking) by inactivating transpeptidases on the inner surface of the bacterial cell membrane. Bactericidal only to growing Escherichia coli . Mode of resistance: Cleavage of β-lactam ring of ampicillin by β-lactamase. Antimicrobial spectrum: Gram-negative and Gram-positive bacteria.


5, 25, 100 g in poly bottle

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anhydrous, 96.0-100.5% (anhydrous basis)


meets USP testing specifications

Ready Made Solution, 100 mg/mL, 0.2 μm filtered

Ampicillin sodium salt

powder, BioReagent, suitable for cell culture

Ampicillin sodium salt

BioXtra, suitable for cell culture

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