Acona A2000SIS SPOS-Based Insoluble Particle Detector

Overview

The Acona A2000SIS is a high-precision, regulatory-compliant insoluble particle detector engineered specifically for pharmaceutical quality control laboratories requiring trace-level particulate quantification in parenteral solutions, biologics, and advanced dispersions. It employs Single Particle Optical Sensing (SPOS) — a first-principle counting methodology grounded in hydrodynamic focusing and dual-mode optical interrogation. Unlike ensemble-averaging techniques such as laser diffraction (LD) or dynamic light scattering (DLS), SPOS resolves and sizes each particle individually by simultaneously measuring extinction (absorption + scattering) and forward-scattered light intensity as particles traverse a precisely defined sensing zone. This enables true number-based particle size distribution (PSD) generation with statistical fidelity, critical for detecting low-abundance, high-risk subvisible particles (≥0.5 µm) that drive immunogenicity risk, filter clogging, or batch rejection under USP and .

Key Features

• Ultra-Low Volume Sampling: Engineered to meet the stringent volumetric accuracy requirements of USP , the A2000SIS delivers reproducible results down to 50 µL sample volume, reducing material consumption by >92% versus conventional 650 µL protocols while maintaining RSD <3% across replicate measurements.
• Dual-Physics SPOS Detection: Integrated LE400 sensor combines extinction and scattering detection modes within a single flow cell, enabling simultaneous optimization of sensitivity for submicron particles (0.5–2 µm) and counting accuracy for larger particles (up to 400 µm).
• 1024-Channel High-Resolution Binning: Provides 0.01 µm resolution across the full detection range — a 64× increase over standard 16-channel instruments — eliminating spectral convolution artifacts and resolving adjacent peaks (e.g., 0.8 µm, 2.0 µm, and 5.0 µm standards) as discrete, non-overlapping distributions.
• 10 ppt Sensitivity for LPC Detection: Achieves detection limits up to 6000× lower than laser diffraction for large particle counts (LPC), making it suitable for monitoring CMP slurries, lipid emulsions, and protein aggregates where tail-end particle burden dictates stability and safety.
• Modular Architecture: Supports optional APS (Automatic Particle Suspension) dilution module for high-concentration or viscous samples (e.g., USP -compliant emulsion testing); sensor cartridge design allows rapid field replacement without recalibration.

Sample Compatibility & Compliance

The A2000SIS is validated for aqueous and non-aqueous parenterals including saline, dextrose, amino acid solutions, monoclonal antibody formulations, PEGylated proteins, liposomal suspensions, and silicone oil-contaminated vials. Its fluidic path is constructed from USP Class VI-certified materials and features chemically resistant wetted components compatible with ethanol, IPA, and low-pH buffers. Regulatory alignment includes full adherence to USP (Subvisible Particles in Therapeutic Protein Products), USP (Particulate Matter in Lipid Emulsions), EP 2.9.19, and JP 6.07. Instrument qualification documentation supports IQ/OQ/PQ execution per ASTM E2500 and ISO/IEC 17025 frameworks.

Software & Data Management

The embedded Acona ParticleSuite™ software is designed for regulated environments and fully compliant with FDA 21 CFR Part 11, Annex 11, and ALCOA+ data integrity principles. It implements role-based access control with granular permissions (e.g., “Run Test”, “Modify Calibration”, “Delete Raw Data”, “Approve Report”). All user actions — login/logout, method execution, calibration events, report generation, and database queries — are captured in an immutable audit trail with timestamp, operator ID, and contextual metadata. Reports include automated Pass/Fail evaluation against configurable USP/EP limits, electronic signature workflows with biometric or PKI-based authentication, and native export to CSV, PDF/A-2, and XML formats. Optional LIMS integration via ASTM E1482-compliant API ensures seamless data handoff and eliminates manual transcription errors.

Applications

• Final container testing of injectables per USP and
• Stability-indicating monitoring of biologics during accelerated and real-time studies
• Process validation support for filtration, filling, and lyophilization steps
• Root cause analysis of particle generation in glass vials, rubber stoppers, and tubing systems
• Characterization of lipid nanoparticles (LNPs), exosomes, and virus-like particles (VLPs)
• Quality release testing of CMP slurries and ceramic suspensions in semiconductor manufacturing

FAQ

Does the A2000SIS require daily calibration?
No — the system uses factory-traceable NIST-matched polystyrene latex standards and built-in reference checks; calibration verification is performed prior to each test sequence, with full recalibration recommended only after sensor replacement or annual PQ.
Can it analyze opaque or highly concentrated samples?
Yes — when paired with the optional APS automatic dilution module, the A2000SIS handles turbid emulsions, nanoparticle suspensions, and undiluted protein solutions while preserving count accuracy and minimizing coincidence error.
Is raw data export permitted under 21 CFR Part 11?
Yes — all unprocessed sensor waveforms, event logs, and histogram bins are stored in encrypted SQLite databases with write-once/read-many (WORM) attributes; exports retain full metadata and digital signatures.
What maintenance intervals are required?
Sensor cleaning is performed automatically post-run using integrated ultrasonic and solvent flush cycles; routine inspection of fluidic lines and syringe pumps is recommended every 500 runs or quarterly, whichever occurs first.
How does it handle silicone oil droplets?
The dual-mode SPOS algorithm discriminates silicone oil from solid particulates based on refractive index contrast and scattering-to-extinction ratio thresholds, enabling selective reporting per USP Annex guidelines.