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Endotoxin Testing Now Available: Quantitative LAL Assay for Peptides

ACS Peptide Testing Labs now offers quantitative endotoxin testing via LAL assay per USP <85>. Learn why endotoxin screening is critical for injectable peptides, compounding pharmacies, and research applications.

ACS Now Offers Quantitative Endotoxin Testing for Peptides

We're pleased to announce that quantitative endotoxin testing via LAL (Limulus Amebocyte Lysate) assay is now available at ACS Peptide Testing Labs. This addition completes our comprehensive contaminant testing panel alongside heavy metal screening (ICP-MS) and residual solvent analysis (GC-MS).

LAL endotoxin testing measures endotoxin in the submitted sample. Confirm method suitability, reporting limits and sample requirements with the laboratory before ordering.

Why Endotoxin Testing Matters

Endotoxins are lipopolysaccharides (LPS) released from the cell walls of gram-negative bacteria. What makes them particularly dangerous:

  • Heat-stable: Standard autoclaving and sterilization do NOT eliminate endotoxins
  • Ubiquitous: Present in water, on surfaces, and in manufacturing environments
  • Potent: Even trace amounts (nanogram levels) can trigger fever, inflammation, and septic shock
  • Invisible: Cannot be detected by visual inspection, smell, or standard sterility testing

For injectable peptides, endotoxin contamination is arguably the most critical safety concern. The FDA requires all injectable products to meet USP endotoxin limits -- and for good reason.

Our Endotoxin Testing Service

Equipment & Method

We use the Charles River Endosafe nexgen-PTS system with the kinetic chromogenic LAL method. This provides:

  • Quantitative results (not just pass/fail)
  • Sensitivity: 0.01 EU/mL
  • USP <85> compliant methodology
  • Rapid turnaround: 5-7 business days

Endotoxin Limits by Application

ApplicationUSP Limit
Injectable peptidesLess than 5 EU/kg body weight
Intrathecal useLess than 0.2 EU/kg body weight
Cell culture researchLess than 0.5 EU/mL recommended
General research useLess than 20 EU/mL typical specification

Pricing

  • Standalone endotoxin testing: $150-$300 per sample
  • Comprehensive contaminant panel (endotoxin + heavy metals + residual solvents): Bundled pricing available
  • Volume discounts: 25-35% off for 5+ samples

Request a quote for your specific needs.

Need Your Peptides Tested?

ACS Peptide Testing Labs provides fast, accurate HPLC purity testing, mass spectrometry identity confirmation, and comprehensive Certificate of Analysis.

Who Should Get Endotoxin Testing?

Compounding Pharmacies (503A/503B)

The FDA requires sterile compounded preparations to meet USP <85> endotoxin limits. Recent enforcement actions have targeted compounding facilities -- particularly those handling GLP-1 peptides like Semaglutide and Tirzepatide -- for inadequate endotoxin testing documentation.

Our quantitative LAL results provide the documentation needed for:

  • Pharmacy board inspections

  • 503B outsourcing facility compliance

  • FDA audit readiness

Research Institutions

Endotoxin contamination is a well-documented confounder in biological research:

  • Activates TLR4 signaling pathways, skewing immunological assays
  • Induces cytokine production that masks or amplifies experimental effects
  • Compromises cell culture viability and reproducibility

If your peptides are used in cell-based assays or in vivo studies, endotoxin testing protects the integrity of your research.

Peptide Suppliers & Manufacturers

Independent endotoxin testing differentiates your products in a competitive market. Providing third-party endotoxin certificates builds customer trust and demonstrates commitment to safety -- especially for peptides marketed for research injection use.

Clinical Trial Sites

IND-enabling studies require documented endotoxin testing per FDA guidelines. Our quantitative results meet regulatory submission requirements and can be included directly in IND applications.

The Complete Contaminant Panel

With endotoxin testing now available, our comprehensive contaminant panel covers all three critical safety categories:

  1. Endotoxin Testing (LAL) -- Bacterial endotoxin quantification per USP <85>
  2. Heavy Metal Screening (ICP-MS) -- Lead, mercury, arsenic, cadmium at ppb detection
  3. Residual Solvent Analysis (GC-MS) -- TFA, DMF, DCM, acetonitrile per ICH Q3C

All three can be performed from a single sample submission (5-10 mg), with results delivered in a combined Certificate of Analysis within 5-7 business days.

How to Get Started

  1. Request a quote -- Select endotoxin testing or the comprehensive contaminant panel
  2. Ship your sample -- Overnight courier in endotoxin-free containers (we provide guidance)
  3. Receive your COA -- Quantitative results with USP compliance assessment in 5-7 business days

Related Resources

Frequently Asked Questions

Our standard turnaround time for quantitative LAL endotoxin testing is 5-7 business days.

Clients in Texas, and across the US, can easily submit samples. We recommend using cold pack overnight shipping to our lab in Sun City Center, FL, to maintain sample integrity. Please call us at (561) 513-8435 for detailed shipping instructions and a quote.

An ACS Certificate of Analysis provides independent, third party verification of endotoxin levels using the quantitative LAL assay. Our COA will detail the methodology, detection limits, and the measured endotoxin units (EU) per milligram, offering an unbiased assessment crucial for research and compounding quality control. Vendor COAs may lack the objective, independent validation we provide.

For accurate quantitative LAL endotoxin testing, we generally require a minimum of 5-10 mg of peptide material. This ensures sufficient sample for both initial testing and any necessary re-tests or dilutions. Should your peptide be particularly potent or limited in quantity, please discuss this with our team.

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Ready to Verify Your Peptide Quality?

Get professional testing from a US-based laboratory. HPLC purity, mass spectrometry identity, contaminant screening with fast turnaround and comprehensive documentation.

(561) 513-8435cpierre@acslabtest.com