Sterile-Filtered Grade: Overview

A sterile-filtered grade of a biological reagent refers to a product that has undergone sterile filtration, typically using a 0.2 μm pore-size filter, to remove bacteria and particulate contaminants without compromising the chemical integrity of the reagent.

It is not the same as sterile-manufactured or aseptically filled under ISO-classified conditions, but it is considered suitable for many biological applications where low bioburden and freedom from particulates are critical.

Key Characteristics

· Sterility Assurance: Achieved by filtration, not by autoclaving or irradiation. The filter physically removes microbial contaminants but does not inactivate viruses or spores.

· Filter Pore Size: Typically 0.22 μm or 0.1 μm for higher assurance in sensitive applications.

· No Preservatives: Generally free of antimicrobial preservatives, making them compatible with cell culture.

· Low Endotoxin Levels: Often tested to meet low endotoxin standards (<0.1 EU/mL) for use in endotoxin-sensitive assays or cell-based work.

Common Applications

Sterile-filtered reagents are widely used in:

· Cell culture and molecular biology where sterility is crucial but heat sterilization is not feasible.

· Diagnostic reagent formulations that are sensitive to autoclaving.

· Protein purification workflows, especially buffers that require sterile conditions.

· Pharmaceutical R&D where high-quality buffers or solutions are needed under non-clinical conditions.

Labeling & Certification

High-quality sterile-filtered reagents are often accompanied by:

· Lot-specific certificates of analysis (CoA)

· Documentation of sterility testing (e.g., membrane filtration method)

· Endotoxin testing results, if applicable (e.g., per USP <85> LAL test)

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