Overview
Acetamide Medium is a selective culture medium designed to isolate microorganisms that can metabolize acetamide. Developed specifically for Pseudomonas aeruginosa detection, it serves as both a differential and selective medium in clinical and environmental microbiology. The medium typically contains acetamide as the sole carbon and nitrogen source, inorganic salts, and pH indicators. Its formulation creates a growth environment where only acetamide-degrading bacteria can proliferate, producing characteristic color changes that aid in identification.
Physical and Chemical Properties
In powder form, acetamide medium appears as a homogeneous mixture of off-white to light tan particles. When prepared according to manufacturer instructions, it forms a clear to slightly opaque agar with a light amber coloration. The medium's selective properties derive from its chemical composition, where acetamide (CH3CONH2) serves as the exclusive carbon source. Most formulations include bromothymol blue or phenol red as pH indicators, which change color as microorganisms metabolize the acetamide and alter the medium's acidity.
Main Applications
The primary application of acetamide medium is in clinical microbiology for Pseudomonas aeruginosa identification, particularly in cystic fibrosis patients and hospital environments. Regulatory agencies in many countries recommend its use for water quality testing in pharmaceutical manufacturing. Environmental laboratories employ this medium to assess microbial populations in soil and water samples. Industrial applications include monitoring microbial contamination in manufacturing processes where acetamide-containing compounds are present.
Safety and Storage
While the prepared medium presents minimal chemical hazards, standard microbiological safety protocols must be observed when handling cultured plates. Powdered medium should be stored in airtight containers protected from moisture and extreme temperatures. Prepared agar plates have limited shelf life (typically 2-4 weeks when refrigerated). Laboratories should validate sterility before use and discard any plates showing contamination, drying, or color changes before inoculation.
B2B Procurement Guide
When sourcing acetamide medium, buyers should verify the product meets relevant pharmacopeia standards (USP, EP) if intended for regulated applications. Bulk purchases (5kg+) typically offer 20-30% cost savings compared to retail packaging. Technical specifications to evaluate include batch-to-batch consistency, gel strength, and the absence of precipitates in prepared medium. Leading manufacturers provide certificates of analysis with each batch, documenting performance characteristics and sterility testing results.
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