Medium 4 (Yeast Beef Agar) 250g for microbiological antibiotic potency testing​

Antibiotic Medium No. 4 – Yeast Beef Agar for Antibiotic Potency Testing

Let us know which dry culture media products you’re interested in, including specifications and quantities. We’ll reply promptly.

Product Overview

Antibiotic Medium No. 4, also known as Yeast Beef Agar, is a dehydrated solid culture medium developed for the microbiological determination of antibiotic potency.
The formulation contains peptone, yeast extract, beef extract, dextrose, and agar, providing suitable growth conditions for agar-based antibiotic assay methods.

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

Key Features

  • Designed for microbiological antibiotic potency testing

  • Solid agar medium suitable for diffusion-based assays

  • 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. 4
  • Alternative Name: Yeast Beef Agar
  • Form: Dehydrated powder
  • Package Size: 250 g / bottle
  • Storage Condition: Room temperature
  • Shelf Life: 3 years
  • Reference Standard: USP
  • Final pH (25°C): 6.6 ± 0.1

✅ Composition (per liter)

ComponentQuantity
Peptone6.0 g
Yeast Extract3.0 g
Beef Extract1.5 g
Dextrose1.0 g
Agar15.0 g

✅ Preparation Instructions

  1. Suspend 26.5 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 or 115°C for 30 minutes.
  5. After sterilization, mix well to prevent agar from settling.
  6. Allow to cool and store for use.

You may also like

Previous Next

Review My Order

0

Subtotal

Taxes & shipping calculated at checkout

Checkout