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United States Pharmacopeia (USP), Code of Federal Regulations (CFR) and AOAC International methods for Antibiotic Potency Testing

The OMNICON USP Zones of Inhibition software performs all calculations in accordance to the procedures defined in the Code of Federal Regulations Standard (CFR) 436.105 as well as in the Section of Design and Analysis of Biological Assays <111>, Chapter of Biological Tests, United States Pharmacopoeia (USP). The software calculates the mean and standard deviation values, excludes zones based on the USP Outlier Test and draws the Zones of Inhibition potency line graph for the Standard Analysis. It also calculates the differences between the reference assay and the sample test assay; obtain the mean and standard deviation of these differences, calculate the label claim percentage and the determined potency value for the Trial Analysis, or the Trial analysis results based on weight and dilution.

Plate Reading
The OMNICON Zones Reader reads each 100 mm petri dish with 6 zones in less than 3/10th of a second, measuring the diameter and shape of the zone. The shape value can be used to exclude zones which are oval due to spills or irregular growth.

21 CFR, Part 11, Electronic Records and Signatures
The OMNICON Zones Reader is compliant, providing three levels of security, audit trails and data encryption.

Assay Layout

USP Cylinder Plate Assay

USP Cylinder Plate Bioassay

3 Point Assay
3 Concentrations - S1, S2 & S3

3 Plates per set - User can define up to 9 plates per set

User defined Concentration Levels

4 Point Assay
4 Concentrations - S1, S2, S3 & S4

3 Plates per set - User can define up to 9 plates per set

User defined Concentration Levels


USP Cylinder Plate Bio Assay


5 Point Assay
5 Concentrations - S1, S2, S3, S4 & S5

3 Plates per set - User can define up to 9 plates per set

User defined Concentration Levels


Assay Reports

Standard Curve Report
USP - CFR_ AOAC Standard Report, Antibiotic Potency 

Standard Curve Graph
USP - CFR_ AOAC Standard Curve Graph, Antibiotic Potency 

Trial (Sample) Report
USP - CFR_ AOAC Trial (Sample) Report, Antibiotic Potency

United States Pharmacopeia (USP)
US-FDA Code of Federal Regulations (CFR)
Association of Analytical Communities (AOAC International)
British Pharmacopeia (BP)
European Pharmacopoeia (EP)
Society of Japanese Pharmacopeia (JP)






OMNICON is a registered trademark of BioLogics, Inc


News & Events


In the 2023 Product Catalog we are introducing an automated Peni Cylinder Dispenser with liquid handling capability to dispense and fill Peni Cylinders 

Contact Us
  BioLogics, Inc.
United States of America

Tel: (703) 367-9020
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