Quality Control
ISO 9001 Certification
QYAOBIO operates under an ISO 9001-certified quality management system, maintained continuously since 2012. This certification means our quality processes — from supplier qualification and incoming material inspection through production monitoring and final product release — are documented, audited, and continuously improved. Annual third-party surveillance audits verify ongoing compliance.
While we do not produce for clinical applications, we apply ISO 9001 discipline to every research-grade product. Our customers rely on this consistency for reproducible experimental results. In research, the cost of poor quality is not patient harm but wasted time, irreproducible data, and compromised publications. We take that seriously.
Quality Control Workflow
Stage 1: Raw Material Qualification
Every raw material — amino acid derivatives, resins, coupling reagents, solvents, immunogens, and chromatography media — is sourced from pre-qualified suppliers. Critical reagents are tested on receipt for identity and purity. Supplier quality history is tracked and reviewed during periodic re-qualification.
Stage 2: In-Process Quality Control
Monitoring during production captures issues before they propagate:
- Peptide Synthesis: Small-scale test cleavage provides crude HPLC profile. For long or difficult sequences, intermediate sampling at defined chain lengths verifies coupling efficiency.
- Antibody Production: Serum titers are monitored by ELISA after each boost. Hybridoma supernatants are screened for specific antibody production before clone expansion.
- Protein Expression: Small-scale expression screening identifies optimal host, temperature, and induction conditions before scale-up.
Stage 3: Final Product QC
Every product batch undergoes release testing before shipment. Results are documented in a Certificate of Analysis (COA).
Analytical Methods
| Method | Purpose | Instrument | Specification |
|---|---|---|---|
| RP-HPLC | Purity determination | Agilent 1260 Infinity II | ≥95% or as ordered |
| LC-MS | Molecular weight confirmation | Agilent 6120 Single Quad | Theoretically calculated ±1.0 Da |
| MALDI-TOF MS | MW for large peptides/proteins | Bruker Autoflex | Theoretically calculated ±0.1% |
| SDS-PAGE | Protein purity | Bio-Rad system | ≥90% (Coomassie staining) |
| ELISA Titer | Antibody activity | Plate reader | ≥1:64,000 (polyclonal) |
| Western Blot | Antibody specificity | Bio-Rad system | Single band at expected MW |
| Amino Acid Analysis | Peptide content | Hitachi L-8900 | ±10% of theoretical |
| Endotoxin (LAL) | Endotoxin level | Charles River Endosafe | ≤1 EU/mg (on request) |
Certificate of Analysis (COA)
Every QYAOBIO shipment includes a comprehensive COA that documents:
- Product Identity: Product name, catalog or project number, lot number, CAS number (if applicable)
- Physical Data: Appearance, molecular weight (calculated and observed), peptide/protein content
- Purity Data: HPLC chromatogram with integration results, MS spectrum with mass assignment
- Solubility Information: Recommended solvents, tested solubility, pH recommendations
- Storage Conditions: Temperature, desiccation requirements, protected from light (if applicable)
- QC Sign-Off: Date of release, analyst signature/identifier
COAs are archived for traceability. Historical COAs for repeat orders are available upon request.
Frequently Asked Questions
What does ISO 9001 certification mean for research products?
ISO 9001 ensures our processes are documented, standardized, and audited. For researchers, this translates to reproducible product quality, traceability from raw material to final shipment, and confidence that batch-to-batch variation is controlled.
Can I request additional QC tests beyond the standard panel?
Yes. Additional testing — amino acid analysis, endotoxin quantification, solubility profiling, and functional activity assays — is available upon request. Specify requirements when requesting a quote.
What happens if a product does not meet specifications?
Any batch that does not meet the agreed purity or identity specification is not released. We re-synthesize or re-purify at our cost. Customers are never charged for products that do not meet specification.
Do you provide QC data with every order?
Yes. Every order ships with a Certificate of Analysis containing HPLC purity data and MS molecular weight confirmation. Additional data (SDS-PAGE, Western Blot, ELISA titer) is included based on product type.
How do you handle stability during international shipping?
Peptides are shipped lyophilized in sealed vials under inert gas where appropriate, ensuring stability during transit. Cold-chain shipping with temperature loggers is available for temperature-sensitive products. We recommend storing lyophilized peptides at -20°C upon receipt. Desiccated storage is critical — avoid repeated freeze-thaw cycles by aliquoting upon reconstitution.
What is the difference between peptide purity and peptide content?
HPLC purity measures the percentage of the target peptide relative to peptide-related impurities in the sample. Peptide content (determined by amino acid analysis or nitrogen content) measures the actual amount of peptide material, accounting for residual water, salts, and counterions from TFA cleavage. A peptide at >98% HPLC purity may have a peptide content of 75–85% — this is normal and documented on the COA. When preparing solutions for biological assays, use the peptide content value, not the gross weight, for accurate concentration calculation.