Overview
Mannitol Fermentation Medium is a microbiological culture medium designed to differentiate bacteria based on their ability to ferment mannitol. It is particularly effective for isolating Staphylococcus aureus, which ferments mannitol, producing acid that changes the medium's color. The medium typically includes mannitol as the fermentable carbohydrate, peptones for bacterial growth, and phenol red as a pH indicator. Its selective properties make it invaluable in clinical, food, and environmental laboratories. The formulation may vary slightly depending on the intended application, but the core components remain consistent. Prepared as either a liquid broth or solid agar, the medium is widely used due to its reliability and ease of interpretation. Proper preparation and quality control are essential to ensure accurate results.
Physical and Chemical Properties
Mannitol Fermentation Medium is typically supplied as a dry powder, which is light beige to pink in color. When prepared, it forms a clear to slightly opaque solution or solid agar, often with a pink to red hue due to the phenol red indicator. The medium is water-soluble and requires autoclaving or filtration for sterilization. Its pH is carefully adjusted to around 7.4 ± 0.2 to optimize bacterial growth and indicator performance. Key chemical properties include the presence of mannitol (10-15 g/L), peptones (5-10 g/L), and sodium chloride (75 g/L) to create a selective environment. The phenol red indicator changes from red to yellow under acidic conditions, signaling mannitol fermentation. The medium is stable when stored properly but should be protected from moisture and contamination.
Main Applications
The primary application of Mannitol Fermentation Medium is in clinical microbiology for the detection of pathogenic Staphylococci, especially Staphylococcus aureus. It is a standard tool in hospital laboratories for diagnosing infections. The medium is also used in food safety testing to identify contamination by Staphylococci in dairy, meat, and processed foods. Environmental monitoring programs utilize it to assess microbial quality in water and surfaces. In research, the medium aids in studying bacterial metabolism and antibiotic resistance patterns. Its selectivity and specificity make it a preferred choice for quality control in pharmaceutical manufacturing. The medium's versatility extends to veterinary diagnostics, where it helps detect animal-borne pathogens.
Safety and Storage
Mannitol Fermentation Medium is generally safe to handle, requiring standard laboratory precautions such as gloves and eye protection. The dry powder should be stored in a cool, dry place at room temperature, away from direct sunlight. Prepared plates or broths must be refrigerated at 2-8°C and used before the expiration date to ensure reliability. Sterility is critical; contaminated media can yield false results. Autoclaving at 121°C for 15 minutes is recommended for liquid preparations. Disposal should follow local regulations for biological waste. Users should avoid inhalation of powder and ensure proper ventilation during preparation.
B2B Procurement Guide
When procuring Mannitol Fermentation Medium, B2B buyers should prioritize suppliers with certifications like ISO 13485 or ISO 9001 to ensure quality. Key considerations include batch-to-batch consistency, sterility guarantees, and compliance with pharmacopeial standards (e.g., USP, EP). Bulk purchases often offer cost savings but require verification of shelf life. Custom formulations may be available for specific applications, such as low-salt variants for sensitive strains. Buyers should request technical data sheets and certificates of analysis. Logistics should account for temperature control for prepared media. Establishing long-term partnerships with reputable suppliers can streamline procurement and ensure reliable supply chains.
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