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Ampicillin trihydrate

900-1050 μg/mg anhydrous basis (HPLC)

Empirical Formula (Hill Notation):
C16H19N3O4S · 3H2O
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


900-1050 μg/mg anhydrous basis (HPLC)


powder or crystals

pKa (25 °C)

2.5 (COOH)
7.3 (NH2)


198-200 °C (dec.) (lit.)

antibiotic activity spectrum

Gram-negative bacteria
Gram-positive bacteria

Mode of action

cell wall synthesis | interferes

storage temp.


SMILES string




InChI key


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General description

Chemical structure: ß-lactam


Ampicillin Trihydrate is commonly 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.

Other Notes

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


Exclamation markHealth hazard

Signal Word


Hazard Classifications

Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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H J Nelis et al.
Antimicrobial agents and chemotherapy, 36(8), 1606-1610 (1992-08-01)
The determination of ampicillin in plasma and serum by reversed-phase high-performance liquid chromatography with UV detection suffers from poor selectivity and sensitivity. Currently, the most common approach to overcoming these problems consists of improving the compound's detectability via pre- or
Ramendra K Singh et al.
European journal of medicinal chemistry, 45(3), 1078-1086 (2009-12-26)
Curcumin bioconjugates, viz. di-O-tryptophanylphenylalanine curcumin (2), di-O-decanoyl curcumin (3), di-O-pamitoyl curcumin (4), di-O-bis-(gamma,gamma)folyl curcumin (6), C(4)-ethyl-O-gamma-folyl curcumin (8) and 4-O-ethyl-O-gamma-folyl curcumin (10) have been synthesized and tested for their antibacterial and antiviral activities. The conjugates 2, 3, 4, 6 and
Sherif A F Rostom et al.
Bioorganic & medicinal chemistry, 17(2), 882-895 (2008-12-17)
The synthesis of two groups of structure hybrids comprising basically the antipyrine moiety attached to either polysubstituted thiazole or 2,5-disubstituted-1,3,4-thiadiazole counterparts through various linkages is described. Twelve out of the newly synthesized compounds were evaluated for their anti-inflammatory activity using
Ebtehal S Al-Abdullah et al.
European journal of medicinal chemistry, 46(9), 4642-4647 (2011-08-19)
New series of 6-phenyl-2,4-disubstituted pyrimidine-5-carbonitriles namely, 2-substitued thio-6-phenyl-3,4-dihydro-4-oxopyrimidine-5-carbonitriles (5a-d, 6, 7a-d, 8), 2-(4-chlorobenzylthio)-4-chloro-6-phenylpyrimidine-5-carbonitrile (9), 2-(4-chlorobenzylthio)-4-arylthio-6-phenylpyrimidine-5-carbonitriles (10a-d) and 2-(4-chlorobenzylthio)-4-arylamino-6-phenylpyrimidine-5-carbonitriles (11a-d) was synthesized and tested for in vitro activities against a panel of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus
Sherif A F Rostom et al.
Bioorganic & medicinal chemistry, 17(6), 2410-2422 (2009-03-03)
The azole pharmacophore is still considered a viable lead structure for the synthesis of more efficacious and broad spectrum antimicrobial agents. Potential antibacterial and antifungal activities are encountered with some tetrazoles. Therefore, this study presents the synthesis and antimicrobial evaluation

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