Medium 9 (Polymyxin Base Agar) 250g for microbiological antibiotic potency testing

Antibiotic Medium No. 9 – Polymyxin Base Agar for Antibiotic Potency Testing

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Product Overview

Antibiotic Medium No. 9, also known as Polymyxin Base Agar, is a dehydrated solid agar culture medium developed for the microbiological determination of antibiotic potency.
The formulation is suitable for agar diffusion–based assay methods used in antibiotic activity evaluation.

This medium is referenced to USP guidelines and supplied in powder form, providing consistent quality, convenient preparation, and long-term stability for routine microbiology laboratory use.

Key Features

  • Designed for microbiological antibiotic potency testing

  • Suitable for agar diffusion assay methods

  • Referenced to USP guidelines

  • Dehydrated powder format for easy storage and preparation

  • Reliable and reproducible laboratory performance

Applications

  • Antibiotic potency determination

  • Microbiological assay of antibiotics

  • Quality control testing

  • Laboratory research and analysis

✅ Product Specifications

  • Product Name: Antibiotic Medium No. 9
  • Alternative Name: Polymyxin Base Agar
  • Form: Dehydrated powder
  • Package Size: 250 g / bottle
  • Storage Condition: Room temperature
  • Shelf Life: 3 years
  • Reference Standard: USP
  • Final pH (25°C): 7.2 ± 0.1

✅ Composition (per liter)

ComponentQuantity
Pancreatic Digest of Casein17.0 g
Papaic Digest of Soyabean3.0 g
Sodium Chloride5.0 g
Dibasic Potassium Phosphate2.5 g
Dextrose2.5 g
Agar20.0 g

✅ Preparation Instructions

  1. Suspend 50.0 g of the product in 1 liter of distilled or deionized water.
  2. Heat to boiling until completely dissolved.
  3. Dispense into suitable containers.
  4. Sterilize at 121°C for 15 minutes.
  5. After sterilization, mix well to prevent agar from settling.
  6. Allow to cool and store for use.

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