Re188LiposomeQualityChecker

Re-188 Liposome Quality Checker — Quality control of Re-188 Liposomes

ℹ️ Utility checks critical parameters of Re-188 Liposomes:

• Radiochemical purity (≥95%)
• Encapsulation efficiency (≥90%)
• Particle size (100-200 nm) and PDI (<0.2)
• W-188 impurity (<0.001%)
• pH, osmolality, endotoxins, sterility

⚠️ CRITICAL: Low encapsulation leads to rapid Re-188 leakage!

Re-188 Liposomes are used for radiosynovectomy and local therapy.

Lipid bilayer membrane stability is critical for isotope retention.

Usage

Re188LiposomeQualityChecker.exe → demo mode (console output)

Re188LiposomeQualityChecker.exe input.csv output.json → evaluate your data

Input format

BatchNumber,RadiochemicalPurityPercent,FreeRheniumPercent,EncapsulationEfficiencyPercent,ParticleSizeMeanNm,PolydispersityIndex,pH,Osmolality_mOsm_per_kg,EndotoxinsEU_per_mL,SterilityTest,ActivityMBq,RadionuclidicPurityPercent,W188ImpurityPercent

Example

RE188-LIPO-2026-001,98.0,2.0,95.0,150.0,0.15,7.4,300.0,10.0,0,500.0,99.95,0.0005

— WHY IS THIS NEEDED?

Re-188 Liposomes are promising drug for local radiation therapy.

• Re-188 has 16.9-hour half-life and emits high-energy beta particles.
• Liposomal form allows retaining isotope in target zone (e.g., joint or tumor).
• Requires high control of particle size and encapsulation efficiency.
• Produced by active loading or post-forming of liposomes.

⚠️ CRITICAL:

• Radiochemical purity ≥95% — guarantee that isotope is inside liposome.
• Encapsulation efficiency ≥90% — minimization of free Re-188 which is rapidly cleared.
• Particle size 100-200 nm — optimal for biodistribution and suspension stability.
• PDI <0.2 — indicator of particle size uniformity.
• W-188 impurity <0.001% — W-188 is parent nuclide of W-188/Re-188 generator.
• pH 7.0-7.6 — physiological range for intra-articular or IV administration.
• Osmolality 250-350 mOsm/kg — isotonicity.
• Endotoxins <175 EU/mL — standard for parenteral drugs.
• Sterility — MANDATORY.

Key features

• Strict control of encapsulation efficiency, unique for liposomal forms.
• Assessment of particle size and polydispersity (PDI).
• W-188 impurity check characteristic of generator production.
• Compliance with GMP requirements for nano-radiopharmaceuticals.
• Comprehensive safety check (endotoxins, sterility, pH, osmolality).

Critical parameters

• Radiochemical purity: ≥95.0%
• Encapsulation efficiency: ≥90.0%
• Free rhenium: ≤5.0%
• Particle size: 100–200 nm
• PDI: <0.2
• Radionuclidic purity: ≥99.9%
• W-188 impurity: <0.001%
• pH: 7.0–7.6
• Osmolality: 250–350 mOsm/kg
• Endotoxins: <175 EU/mL
• Sterility: no growth

💡 Usage tips:

1. Radiochemical purity and encapsulation efficiency determined by ultrafiltration or gel chromatography.

2. Particle size and PDI measured by dynamic light scattering (DLS).

3. Drug should be stored at 2-8°C to maintain lipid bilayer stability.

4. Suspension must be thoroughly mixed before administration.

5. Re-188 also emits 155 keV gamma quantum, allowing distribution imaging.

⚠️ Note: Re-188 Liposomes combine benefits of beta therapy and nanotechnology. Quality control here is more complex than for simple solutions as it requires assessment of both chemical and physical stability of nanoparticles.