Quality Control Framework¶
Quality Philosophy¶
PeptideSourceHub operates under a three-gate quality system that subjects every production batch to analytical verification at multiple stages. This multi-layer approach ensures that quality is not merely tested at the end — it is built into every step of the manufacturing process. Our facility has maintained this framework since 2009, with a production record exceeding 2 million vials.
Our QC system is aligned with:
- ISO 9001:2015 Quality Management Systems
- ICH Q7 GMP for Active Pharmaceutical Ingredients
- USP <1503> Peptide Quality Attributes
Three-Gate Quality System¶
┌─────────────────────────────────────────────────────────────┐
│ MANUFACTURING FLOW │
│ │
│ Raw Materials → Synthesis → Purification → Packaging │
│ │ │ │ │ │
│ ▼ ▼ ▼ ▼ │
│ [Gate 1] [Gate 1] [Gate 2] [Gate 3] │
│ In-Process In-Process Release Pre-Shipment │
│ Inspection Monitoring Testing Verification │
└─────────────────────────────────────────────────────────────┘
Gate 1: In-Process Controls¶
| Stage | Control Point | Method | Acceptance Criteria |
|---|---|---|---|
| Raw Material Receipt | Amino acid identity & purity | HPLC, TLC | ≥99% individual amino acid purity; identity confirmed |
| Raw Material Receipt | Resin and reagent quality | Supplier COA review | Meets specification per approved supplier list |
| Solid-Phase Synthesis | Coupling efficiency monitoring | Kaiser/ninhydrin test, conductivity | ≥99% coupling efficiency per cycle |
| Cleavage & Deprotection | Crude peptide identity | HPLC screening, MS | Target peak present; major impurities identified |
Gate 2: Release Testing¶
All products must pass Gate 2 before advancing to final packaging:
| Test | Method | Reference Standard | Acceptance Criteria |
|---|---|---|---|
| Purity | RP-HPLC (C18, ACN/water/0.1% TFA gradient) | USP <621>, Ph.Eur. 2.2.46 | ≥99.0% main peak area |
| Identity (MW) | ESI-MS | — | Mass within ±1.0 Da of theoretical [M+H]+ |
| Peptide Content | Amino acid analysis or nitrogen content | USP <1051> | ≥85% (typical: 85–92%) |
| Residual TFA | Ion chromatography | — | ≤0.1% (w/w) |
| Appearance | Visual inspection | — | White to off-white lyophilized powder |
| Solubility | Gravimetric in recommended solvent | — | ≥1 mg/mL in specified solvent |
Gate 3: Pre-Shipment Verification¶
Before any batch is released for shipment, Gate 3 confirms:
| Check | Scope |
|---|---|
| Batch Documentation Audit | COA, MS spectra, HPLC chromatogram reviewed and approved |
| Label Verification | Product name, batch number, quantity, storage conditions correct |
| Packaging Integrity | Vacuum-sealed vials, desiccant present, tamper-evident seals intact |
| Storage Conditions | Temperature log verified (-20°C ± 5°C) throughout storage period |
| Documentation Package | All quality documents collated and verified for completeness |
Analytical Instrumentation¶
Our QC laboratory is equipped with the following primary analytical instruments:
| Instrument | Model Range | Application |
|---|---|---|
| Analytical HPLC | Agilent 1260 Infinity II series | Purity determination, impurity profiling |
| Preparative HPLC | Agilent / Shimadzu preparative systems | Purification at gram scale |
| Mass Spectrometer | ESI-MS (single quadrupole) | Molecular weight confirmation |
| MS/MS | Triple quadrupole (select products) | Sequence verification by fragmentation |
| Lyophilizer | Labconco / Christ freeze-dryers | Final product preparation |
| Analytical Balance | Mettler Toledo (0.01 mg readability) | Weighing and content determination |
| Ion Chromatograph | Metrohm | Residual counter-ion analysis (TFA, acetate) |
QC Personnel & Training¶
Our quality team is structured for independence and accountability:
| Role | Responsibility |
|---|---|
| QC Director | System oversight, OOS investigations, batch release authorization |
| QC Analysts | Routine HPLC, MS, and content analysis per SOP |
| QA Manager | GMP compliance, SOP management, deviation/CAPA handling |
| Documentation Specialist | COA issuance, batch record review, archive management |
All analytical staff undergo documented training on each SOP, with periodic requalification. Training records are maintained as part of the ISO 9001 QMS documentation.
In-Depth Quality Guides¶
→ Certificate of Analysis & Purity Analysis — How to read, verify, and challenge a COA
→ HPLC Chromatography — Methodology, peak interpretation, and impurity identification
→ Mass Spectrometry — ESI-MS, MALDI-TOF, MS/MS, and spectrum interpretation
→ Batch Traceability — Lot numbering, traceability chain, and audit trails
→ Documentation Package — Standard and extended documentation deliverables