Form
Powder
Appearance
Whiteoralmostwhitecrystallinepowder
Source
Semi-synthetic
WaterContent(KarlFisher)
4.0-8.0%
pH
3.0-5.5
OpticalRotation
+149°to+158°
Assay
950-1030µg/mg
Cephalexinhydrateisafirstgenerationcephalosporinantibioticandisslightlysolubleinaqueoussolution(1.789mg/mL).
23325-78-2
C16H17N3O4S·H2O
347.39g/mol(anhydrousbasis)
365.41g/mol(monohydrate)
Likeβ-lactams,cephalosporinsinterferewithPBP(penicillinbindingprotein)activityinvolvedinthefinalphaseofpeptidoglycansynthesis.PBP’sareenzymeswhichcatalyzeapentaglycinecrosslinkbetweenalanineandlysineresiduesprovidingadditionalstrengthtothecellwall.Withoutapentaglycinecrosslink,theintegrityofthecellwallisseverelycompromisedandultimatelyleadstocelllysisanddeath.Resistancetocephalosporinsiscommonlyduetocellscontainingplasmidencodedβ-lactamases.
-20°C.Protectedfromlight.
2941.90.3000
Cephalexinhydrateisabroadspectrumantibiotictargetingawidevarietyofgrampositiveandgramnegativebacteriaespeciallythosewhichcauserespiratoryinfections.
Powder
Whiteoralmostwhitecrystallinepowder
Semi-synthetic
4.0-8.0%
3.0-5.5
+149°to+158°
950-1030µg/mg