Form
Powder
Appearance
White or almost white crystalline powder
Source
Semi-synthetic
Water Content (Karl Fisher)
4.0-8.0%
pH
3.0-5.5
Optical Rotation
+149° to +158°
Assay
950-1030 µg/mg
Cephalexin hydrate is a first generation cephalosporin antibiotic and is slightly soluble in aqueous solution (1.789 mg/mL).
23325-78-2
C16H17N3O4S · H2O
347.39 g/mol (anhydrous basis)
365.41 g/mol (monohydrate)
Like β-lactams, cephalosporins interfere with PBP (penicillin binding protein) activity involved in the final phase of peptidoglycan synthesis. PBP’s are enzymes which catalyze a pentaglycine crosslink between alanine and lysine residues providing additional strength to the cell wall. Without a pentaglycine crosslink, the integrity of the cell wall is severely compromised and ultimately leads to cell lysis and death. Resistance to cephalosporins is commonly due to cells containing plasmid encoded β-lactamases.
-20°C. Protected from light.
2941.90.3000
Cephalexin hydrate is a broad spectrum antibiotic targeting a wide variety of gram positive and gram negative bacteria especially those which cause respiratory infections.
Powder
White or almost white crystalline powder
Semi-synthetic
4.0-8.0%
3.0-5.5
+149° to +158°
950-1030 µg/mg