Overview
Counting reagents are essential tools in laboratories for accurately quantifying cells, bacteria, or particles in suspensions. They are widely used in biomedical research, clinical diagnostics, and quality control processes. These reagents typically contain dyes or stains that enhance visibility under microscopes or automated counters. Their formulations vary depending on the target (e.g., mammalian cells, yeast, or bacteria) and counting method (manual or instrument-based).
Physical and Chemical Properties
Most counting reagents are aqueous solutions with neutral pH (6.5-7.5) to maintain cell integrity during analysis. They often incorporate vital dyes like trypan blue or fluorescent markers for dead/live cell differentiation. The solutions are designed to be isotonic to prevent cell lysis or shrinkage. Shelf life typically ranges from 6 months to 2 years when stored properly. Some advanced formulations include preservatives for extended stability at room temperature.
Main Applications
In research laboratories, counting reagents are indispensable for cell culture work, enabling scientists to determine cell concentrations for experiments. Clinical labs use them for blood cell counts and urinalysis. Industrial applications include microbial load testing in food production and water quality monitoring. Automated cell counters in biopharmaceutical manufacturing rely on specialized counting reagents for process control.
Safety and Storage
While generally low-risk, counting reagents may contain chemicals that require proper handling. Always consult SDS sheets and use appropriate PPE. Most reagents should be aliquoted to minimize contamination risk. Storage at 2-8°C is standard, though some room-temperature stable formulations exist. Avoid freeze-thaw cycles as they may compromise reagent performance. Always check for precipitation or color changes before use.
B2B Procurement Guide
When purchasing counting reagents in bulk, verify the manufacturer's quality certifications (ISO 13485 for medical-grade products). Consider compatibility with your existing equipment and protocols. For large-volume orders (100+ liters), negotiate tiered pricing. Request samples for validation testing before major purchases. Lead times for custom formulations may extend to 4-6 weeks, so plan accordingly.
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