Stability

40nm vs. 20nm Colloidal Gold: Which Size is Best for Your Assay?

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The 40nm Standard For most lateral flow assays, 40nm gold is the industry standard. It offers the best balance between color intensity (optical density) and steric stability against aggregation. When to Use 20nm? Smaller 20nm particles have a higher surface-area-to-volume ratio, allowing for higher antibody loading density. This can be advantageous for competitive assays where … Read more

Extending the Shelf Life of Lateral Flow Assays: Critical Factors

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Humidity is the Enemy Nitrocellulose membranes are highly hygroscopic. Excess moisture can alter the pore structure and degrade antibody activity over time. Proper packaging with high-grade silica desiccants is non-negotiable. Accelerated Aging Protocols To validate a 24-month shelf life, we employ Arrhenius equation-based accelerated aging tests (e.g., storing strips at 55°C for weeks). Due Bio … Read more