Overview
Martin Agar Medium, developed by Martin in 1950, is a specialized microbiological growth medium designed for selective cultivation of fungi and yeasts. Its formulation combines peptones as nitrogen sources, dextrose for energy, and selective inhibitors (rose bengal and streptomycin) to suppress bacterial growth while allowing fungal proliferation. The medium's distinctive pink-red coloration from rose bengal aids in colony differentiation. It meets ISO 21527 and FDA BAM standards for yeast/mold counts, making it a regulatory-compliant choice for quality control laboratories in food production facilities and pharmaceutical manufacturing.
Physical and Chemical Properties
The prepared medium appears as a translucent pink gel at room temperature, with a pH range of 5.6±0.2 after sterilization. Rose bengal acts as both a pH indicator and selective agent, becoming more inhibitory at lower pH levels. Streptomycin sulfate provides additional selectivity against gram-negative bacteria. Key preparation requires boiling to dissolve agar (15-20 g/L), followed by autoclaving at 121°C for 15 minutes. The medium remains stable for ~3 months when stored refrigerated in airtight containers. Performance validation should include growth promotion testing with Aspergillus brasiliensis and Candida albicans reference strains.
Main Applications
In food microbiology, Martin Agar is the gold standard for detecting spoilage molds in dairy (cheese, yogurt), baked goods, and processed meats. The pharmaceutical industry uses it for cleanroom environmental monitoring, particularly in sterile manufacturing areas where fungal contamination poses product risks. Environmental testing laboratories apply this medium for air sampling in HVAC systems and surface swabs in water-damaged buildings. Recent adaptations include combination with chloramphenicol for enhanced selectivity in soil microbiome studies. Some clinical labs utilize modified versions for superficial fungal infection diagnostics.
Safety and Storage
While non-toxic in solidified form, powdered Martin Agar components require PPE (gloves, mask) during preparation due to streptomycin's antibiotic properties. Spent cultures should be autoclaved before disposal to prevent environmental release of selective agents. Manufacturers typically supply the medium as ready-to-mix powders in foil pouches with oxygen absorbers. Unopened packages maintain stability for 2 years at room temperature. Once prepared, plates should be used within 4 weeks when stored at 2-8°C in humidity-controlled conditions to prevent dehydration and pH drift.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 13485 certification for microbiological media production. Key specifications to verify include: ≤5% moisture content in powder, sterility assurance level (SAL) of 10^-6, and growth performance guarantees with ATCC strains. Bulk orders (50+ kg) typically offer 15-30% cost savings, with lead times of 4-6 weeks for customized formulations. Some manufacturers provide irradiation sterilization as an alternative to autoclaving for heat-sensitive components. For GMP applications, request full traceability documentation including raw material COAs and manufacturing batch records.
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