Overview
The Petri dish is a fundamental tool in biological and medical laboratories, designed for culturing microorganisms, cells, or small organisms. Its simple yet effective design—a shallow dish with a matching lid—minimizes contamination while allowing observation. Originally made of glass, modern versions often use optically clear polystyrene plastic for disposability and cost efficiency. Petri dishes come in standardized sizes, with diameters ranging from 60mm to 150mm. Their transparency enables easy microscopic examination, and the lids ensure a controlled environment. Sterility is critical, so pre-sterilized disposable dishes are common in high-throughput labs.
Product Features
Petri dishes are valued for their transparency, durability, and ease of handling. Glass dishes withstand repeated sterilization (autoclaving) but are heavier and prone to breakage. Plastic dishes are lightweight, inexpensive, and ideal for single-use applications. The dishes often feature stacking rims for efficient storage and ventilation grooves to promote gas exchange in aerobic cultures. Some specialized versions include grid markings for colony counting or compartments for co-culture experiments. The choice between vented and non-vented lids depends on the need for air exchange.
Main Uses
Petri dishes are indispensable in microbiology for isolating and identifying bacteria or fungi. They are also used in pharmaceutical research, environmental testing, and education. In cell biology, dishes may be coated with substrates like collagen to support tissue growth. Beyond research, Petri dishes serve in clinical diagnostics (e.g., antibiotic sensitivity testing) and food safety inspections. Disposable variants reduce cross-contamination risks, while reusable glass dishes suit sustainable lab practices.
Culture and Development
The Petri dish was pioneered by German bacteriologist Julius Richard Petri in 1887 while working under Robert Koch. It replaced less practical methods like solid media in test tubes. Over time, materials evolved from glass to plastics, and manufacturing processes improved sterility assurance. Today, innovations include treated surfaces for enhanced cell adhesion and dishes tailored for automated imaging systems. The design remains largely unchanged, a testament to its functionality.
B2B Procurement Guide
When sourcing Petri dishes, prioritize suppliers with ISO-certified manufacturing and batch-specific sterility documentation. Bulk purchases (e.g., packs of 500–1,000) reduce costs but require proper storage to maintain sterility. Evaluate material compatibility with intended protocols—plastic dishes may warp during autoclaving, while glass requires careful handling. For specialized applications (e.g., anaerobic cultures), confirm lid seals or opt for pre-reduced media dishes.
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