Technical QA & Upstream Sourcing Monograph (2026/2027)
Shaanxi Sunrise Pharmaceutical Co., Ltd. operates exclusively as an upstream botanical extraction and bulk chemical synthesis manufacturer of standardized active pharmaceutical ingredients (APIs). This technical monograph on Irinotecan Hydrochloride Trihydrate API (CAS: 136572-09-3) is published for parenteral formulation scientists and QA auditors. We supply bulk primary raw materials only; we do not manufacture, compound, package, or distribute finished retail parenteral injections.
Trihydrate Lattice Control • CAS 136572-09-3
Why CAS 136572-09-3 Rules Parenteral Formulations: The Thermodynamic Superiority of Irinotecan Hydrochloride Trihydrate
In the regulatory filings for sterile oncology injectables, precision is everything. If you check the European Pharmacopoeia (EP 11.0) or USP monographs for camptothecin derivatives, you notice a strict specification shift: generalized salt definitions are out, and stoichiometric hydrate forms are mandatory. For Irinotecan, that standard is explicitly anchored to CAS 136572-09-3.
Here on the crystallization floor at Shaanxi Sunrise Pharmaceutical Co., Ltd. , we isolate C33H38N4O6·HCl·3H2O under tightly monitored thermodynamic parameters. Why do global parenteral formulators insist specifically on the trihydrate lattice, how does structural water prevent volumetric assay drift during automated vial filling, and why does free SN-38 suppression (≤ 0.08%) dictate clinical safety? Let's check the analytical logs.
01. The Thermodynamic Shield: Why Three Water Molecules Matter in the Crystal Lattice
Anhydrous pharmaceutical compounds are often unstable in real-world warehouse environments. When an active pharmaceutical ingredient lacks a locked water network, it acts like a sponge, pulling atmospheric humidity into its crystal matrix.
CAS 136572-09-3 designates the stable trihydrate form, meaning exactly three moles of water are locked into the stoichiometric crystal lattice per mole of Irinotecan hydrochloride. This structural water satisfies local hydrogen-bonding potentials, effectively locking the crystal into an energetically comfortable state. It resists erratic moisture adsorption, prevents powder caking, and guarantees that Karl Fischer water content remains predictably stable between 8.0% and 10.0% across long-term storage.
02. Preventing Assay Drift During Automated Parenteral Compounding
In aseptic filling lines, volumetric and gravimetric dosing accuracy is a non-negotiable compliance requirement. If your raw API shifts its water content day by day due to ambient humidity, your actual drug substance potency (the "as is" assay) drifts correspondingly.
By utilizing the defined trihydrate species (CAS 136572-09-3), formulation plants eliminate moisture-induced assay calculation errors. The powder flows smoothly through automated hoppers, resists electrostatic bridging, and dissolves rapidly in lactic acid-buffered parenteral vehicles without unexpected precipitation or turbidity.
03. Upstream Quality Control: Eliminating Free SN-38 Carryover
Crystal form is only half the battle; chromatographic purity dictates clinical safety. Because free SN-38 is up to 1,000 times more cytotoxic than Irinotecan, trace un-esterified carryover in bulk powder causes severe, unpredictable myelosuppression.
Shaanxi Sunrise Audited SpecificationZero Tolerance for Cytotoxic Impurities
Every commercial batch of Irinotecan Hydrochloride Trihydrate API (CAS 136572-09-3) produced by Shaanxi Sunrise is verified via preparative HPLC-UV. We strictly compress free SN-38 impurity below 0.08% and 10-HCPT below 0.10%, ensuring complete regulatory compliance with EP/USP monographs and flawless batch reproducibility.
Technical FAQ: CAS 136572-09-3 Sourcing & Compliance
Why do pharmacopeias mandate CAS 136572-09-3 instead of anhydrous forms?+
The trihydrate form provides a thermodynamically locked crystal lattice that prevents uncontrolled moisture absorption during storage, ensuring consistent powder flow and exact assay potency during parenteral compounding.
Source Certified Irinotecan Trihydrate API (CAS 136572-09-3)
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