Amoxicillin Analyzed Orthogonally with HPLC – AppNote

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May 16, 2012
Bill Ciccone

AppNotes ANP/HILIC Methods / AppNotes Cogent Diamond Hydride / AppNotes Library / AppNotes Pharmaceuticals / ARTICLES, APPNOTES, FAQ

Orthogonal Analysis to USP Assay Method for Validation

The USP Assay Method for the antibiotic Amoxicillin is performed in Reversed Phase. Analysis by an Orthogonal Retention mode is very useful and can be readily done by Aqueous Normal Phase (ANP) mode of HPLC, using solvents common to both.

A benefit of this Method is the more Symmetrical Peak Shape obtained. This is important for compounds such as Amoxicillin that can give poor Peak Shapes in many Reversed Phase Methods including the USP Monograph.

Peak:
Amoxicillin

Method Conditions
Column: Cogent Diamond Hydride™, 4μm, 100Å
Catalog No.: 70000-7.5P
Dimensions: 4.6 x 75mm
Mobile Phase:
—A: DI Water / 10mM Ammonium Acetate
—B: 90% Acetonitrile / 10% DI Water / 10mM Ammonium Acetate
Gradient:

Time (minutes)	%B
0	100
4	90
5	100

Injection vol.: 2μL
Flow rate: 1.0mL / minute
Detection: UV @ 230nm
Sample Preparation:
—Stock Solution: 1mg / mL Amoxicillin Trihydrate USP RS in 50:50 Solvent A / Solvent B diluent.
—Working Solution: A 100μL aliquot of the Stock Solution was diluted to 0.1mg / mL using 900μL 50:50 Solvent A / Solvent B diluent.
t0: 0.95 minutes

Note: Amoxicillin is a beta-lactam antibiotic used to treat a variety of bacterial infections. Its mechanism of action is by inhibition of the synthesis of bacterial cell walls.

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