Overview
Cytarabine is a pyrimidine nucleoside analog first synthesized in 1959 as part of anticancer drug development. It remains a cornerstone in treating hematological malignancies, particularly acute leukemias. The compound mimics cytidine but contains arabinose instead of ribose, enabling its incorporation into DNA during replication and subsequent chain termination. As a Schedule III controlled substance in some jurisdictions, cytarabine requires regulated handling. Its clinical use demands precise dosing protocols due to narrow therapeutic indices. Pharmaceutical manufacturers typically produce it in sterile lyophilized powder or solution forms for intravenous or subcutaneous administration.
Physical and Chemical Properties
Cytarabine crystallizes in a monoclinic system with characteristic UV absorption maxima at 280 nm. The anhydrous form is hygroscopic, requiring desiccated storage. Its solubility profile allows formulation in aqueous systems, though stability decreases above pH 6.0. The arabinose configuration confers metabolic resistance compared to natural nucleosides. Under accelerated degradation conditions, cytarabine primarily undergoes hydrolytic deamination to uracil arabinoside. Thermal gravimetric analysis shows decomposition beginning at 214°C without distinct melting behavior.
Main Applications
In clinical oncology, cytarabine forms the backbone of '7+3' induction therapy for AML, often combined with anthracyclines. High-dose regimens (up to 3 g/m²) penetrate the blood-brain barrier for meningeal leukemia prophylaxis. Recent advances include liposomal encapsulation (DepoCyt) for sustained-release intrathecal use. Beyond hematologic cancers, research explores cytarabine's potential against viral infections due to its inhibition of viral DNA polymerases. Experimental combinations with hypomethylating agents show promise in myelodysplastic syndromes. Veterinary applications include feline leukemia virus management.
Safety and Storage
Cytarabine requires biosafety level 2 handling precautions due to reproductive toxicity and mutagenic potential. Spill management involves neutralization with sodium hypochlorite solution. Occupational exposure limits recommend airborne concentrations below 0.03 mg/m³ (8-hour TWA). Long-term stability studies indicate 24-month shelf life when stored refrigerated in amber glass vials. Reconstituted solutions maintain sterility for 48 hours at 25°C or 7 days refrigerated. Degradation products include cytotoxic uracil derivatives, mandating HPLC purity monitoring during storage.
B2B Procurement Guide
Bulk pharmaceutical buyers should prioritize suppliers with EDQM certification or US DMF filings. Key quality parameters include endotoxin levels (<0.5 EU/mg), residual solvent profiles (ICH Q3C compliance), and polymorphic form verification (typically β-crystalline). Spot market prices fluctuate based on API production capacity and oncology drug demand cycles. Contract manufacturing agreements often include stability testing clauses. Logistics providers must demonstrate temperature-controlled transportation capabilities with continuous GPS monitoring for high-value shipments.
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