Form
Powder
Appearance
Whiteoralmostwhitepowder
Source
Semi-synthetic
WaterContent(KarlFisher)
≤10.0%
MeltingPoint
196-197°C(dec.)
OpticalRotation
+225°
Assay
≥90.0%
Methicillinsodiumisanarrowspectrumβ-lactamantibioticinthepenicillinfamilyandissolubleinaqueoussolution(0.3mg/mL).
132-92-3
C17H19N2NaO6S
402.40
β-lactamsinterferewithPBP(penicillinbindingprotein)activityinvolvedinthefinalphaseofpeptidoglycansynthesis.PBP’sareenzymeswhichcatalyzeapentaglycinecrosslinkbetweenalanineandlysineresiduesprovidingadditionalstrengthtothecellwall.Withoutapentaglycinecrosslink,theintegrityofthecellwallisseverelycompromisedandultimatelyleadstocelllysisanddeath.Resistancetoβ-lactamsiscommonlyduetocellscontainingplasmidencodedβ-lactamases.Methicillinismostlyresistanttoβ-lactamases.
-20°C
2941.10.5000
MethicillintargetsprimarilythecellwallofGrampositiveorganismsespeciallyStaphylococcusaureus.
Powder
Whiteoralmostwhitepowder
Semi-synthetic
≤10.0%
196-197°C(dec.)
+225°
≥90.0%