Sterility Testing Methods for Peptide Manufacturers

Sterility Testing Methods for Peptide Manufacturers

Sterility testing verifies the absence of viable microorganisms in peptide products. For products intended for sensitive research applications, sterility is a critical quality attribute that must be rigorously verified.

Direct Inoculation Method

The simplest sterility testing approach involves directly inoculating growth media with the test sample.

Procedure: A portion of the product is transferred into two types of growth media — Fluid Thioglycollate Medium (FTM) for anaerobic and aerobic bacteria, and Tryptic Soy Broth (TSB) for aerobic bacteria and fungi. Media are incubated for 14 days and observed for turbidity indicating microbial growth.

Membrane Filtration Method

For products that may have inherent antimicrobial properties or turbidity that complicates visual inspection.

Procedure: The product is filtered through a sterile 0.45 μm membrane, which retains any microorganisms. The membrane is then placed in growth media and incubated for 14 days.

Advantages: Removes potential growth-inhibiting substances, allows testing of larger sample volumes.

Rapid Sterility Methods

Emerging technologies are reducing the time required for sterility testing:

ATP Bioluminescence: Detects the presence of living cells through their ATP content. Results in hours rather than days.

PCR-Based Methods: Detect microbial DNA regardless of whether organisms are viable. Extremely sensitive but cannot distinguish live from dead cells.

Flow Cytometry: Can detect and count individual microbial cells, providing rapid quantitative results.

Evolve Aminos Sterility Assurance

We employ appropriate sterility verification methods to ensure our products meet the cleanliness standards required for your research applications.