The term API (Active Pharmaceutical Ingredient) designates the biologically active substance of a medicine, responsible for its therapeutic effect. For pharmaceutical peptides (insulin, semaglutide, tirzepatide, octreotide, liraglutide, desmopressin, goserelin, etc.), the API is the peptide itself in pure and stabilised form, before incorporation into the final galenic form (injectable solution, tablet, lyophilised powder, patch).
Quality and production requirements. Manufacturing of a pharmaceutical peptide API is subject to GMP (Good Manufacturing Practice) defined by ICH Q7 and USP/Ph. Eur./JP pharmacopoeias. Typical specifications include: identity (NMR, MS, amino acids, Edman), purity >99% by RP-HPLC (USP <621>), individual impurities <0.1-0.5%, water content (Karl Fischer), residual solvents (GC <1062>), heavy metals (USP <232>), endotoxins (LAL <85>, <0.1 EU/mg for injection), sterility (<71>), microbial count, particle size. Industrial SPPS yield for a 30-40 aa peptide is between 5 and 15% after RP-HPLC purification.
Regulatory documentation. Registration of a pharmaceutical API requires a Drug Master File (DMF in USA, ASMF in Europe) including Module 3 (CTD/Common Technical Document quality) with manufacturing data, quality control, ICH Q1A stability (25°C/60%RH and 40°C/75%RH accelerated), process validation, impurity characterisation (ICH Q3A), forced degradation study (pH, heat, light, oxidation). GMP inspection is conducted by FDA (USA), EMA/ANSM (Europe), PMDA (Japan) or NMPA (China).
Peptide API vs finished product. An RUO API (Research Use Only) meets similar analytical specifications (HPLC >98%, ESI-MS, COA) but is not intended for human use and has no marketing authorisation. The pharmaceutical equivalent also requires complete GMP validation, documented traceability chain, multi-batch stability studies over 24-36 months, and complete regulatory registration (NDA, MAA) for each therapeutic indication.
Décryptez la caractérisation complète d'un peptide : RP-HPLC préparative et analytique, LC-MS haute résolution Orbitrap/QTOF, RMN 2D (COSY/TOCSY/NOESY), dégradation d'Edman, cartographie peptidique MS/MS, dichroïsme circulaire. Les 10 techniques qui séparent un peptide research-grade d'un peptide douteux, avec seuils de détection et stratégie de QC.
Maitrisez les mecanismes qui detruisent vos peptides : oxydation Met, deamidation Asn, hydrolyse, aggregation. Protocoles de lyophilisation, conditions de stockage, reconstitution optimale et QC shelf-life. Le pilier technique que tout laboratoire doit integrer pour garantir l'integrite de ses peptides en recherche exploratoire.
Principe Merrifield, stratégies Fmoc et Boc, résines (Wang, Rink amide, 2-chlorotrityl), agents de couplage (HBTU, HATU, DIC/HOBt), cycle de synthèse, clivage TFA, purification RP-HPLC, contrôle qualité LC-MS et test Kaiser. Le pilier scientifique de référence sur la fabrication des peptides synthétiques.