Acona A7000APS Optical Particle Counter

Overview

The Acona A7000APS Optical Particle Counter is an advanced, laboratory-grade SPOS (Single Particle Optical Sensing) instrument engineered for high-fidelity particle characterization in demanding regulatory and R&D environments. Unlike ensemble-averaging techniques such as laser diffraction (LD) or dynamic light scattering (DLS), the A7000APS employs a true single-particle detection architecture—measuring extinction and scattering signals from each individual particle traversing the LE400 dual-mode optical sensor. This enables direct quantification of both number- and volume-based particle size distributions (PSD) across a broad 0.5–400 µm range, with 0.01 µm resolution and 1024 logarithmically spaced data channels. Its patented two-step automatic dilution system allows unattended analysis of highly concentrated suspensions up to 10¹¹ particles per milliliter—eliminating manual dilution errors while preserving statistical validity and reproducibility. Designed for mission-critical applications in biopharmaceutical quality control, semiconductor slurry monitoring, and advanced material development, the A7000APS delivers trace-level large particle count (LPC) sensitivity and regulatory-compliant data integrity.

Key Features

• Dual-physical-mode optical sensing: Simultaneous extinction and scattering signal acquisition within a single flow cell, optimizing detection fidelity for sub-micron and micron-scale particles.
• Patented two-step automatic dilution module: Enables direct analysis of ultra-concentrated samples without operator intervention; maintains stoichiometric accuracy through real-time dilution factor compensation.
• 1024-channel high-resolution PSD output: Provides granular binning at 0.01 µm intervals—resolving closely spaced populations (e.g., 0.8 µm, 2 µm, and 5 µm standards) as distinct, non-overlapping peaks.
• 10 ppt (particles per trillion) detection limit: Achieves >6000× higher sensitivity for large particle counts (>2 µm) compared to conventional LD systems—critical for detecting low-probability aggregation events in parenteral formulations and CMP slurries.
• Robust fluidic architecture: Chemically resistant wetted path compatible with organic solvents, high-viscosity fluids (up to 500 cP), and aggressive etchants used in semiconductor processing.

Sample Compatibility & Compliance

The A7000APS supports diverse sample matrices including lipid emulsions, liposomal dispersions, CMP slurries (SiO₂, Al₂O₃), photoresists, protein solutions, inkjet inks, and colloidal suspensions. It is validated for compliance with pharmacopeial standards including USP (Fat Emulsion Evaluation), Chinese Pharmacopoeia (ChP) 2020 Edition, and ISO 21501-4 for particle counting instrumentation. The system meets 21 CFR Part 11 requirements through built-in electronic signature support, role-based access control (with over 30 configurable permission levels), immutable audit trails covering all user actions (login, calibration, test execution, report generation), and encrypted database backups. Optional LIMS integration ensures seamless data transfer and long-term archival in GxP-aligned workflows.

Software & Data Management

The Acona Control Suite v4.x provides a validated, Windows-based interface supporting method-driven operation, automated pass/fail assessment per USP PFAT5 criteria, and time-series trend analysis for stability studies. All raw event data—including pulse height, width, and shape—are retained with timestamped metadata. Reports include customizable templates compliant with GLP/GMP documentation requirements and support digital signatures with certificate-based authentication. Audit logs are exportable in CSV or PDF format and searchable by date range, user ID, or test ID. Database auto-backup occurs at scheduled intervals or upon session termination, minimizing risk of data loss during extended testing campaigns.

Applications

• Biopharmaceutical Quality Control: Quantitative PFAT5 evaluation of IV fat emulsions and liposomal drug products; early-stage detection of particle growth kinetics during accelerated stability studies.
• Semiconductor Manufacturing: In-line monitoring of CMP slurry degradation via LPC trending (>2 µm); formulation optimization of abrasive slurries under varying acid concentrations (e.g., H₂SO₄ vs. HNO₃).
• Advanced Materials R&D: Characterization of protein aggregates, nanoparticle dispersions, and high-solids-content inks where ensemble methods fail due to polydispersity or refractive index heterogeneity.
• Regulatory Submissions: Generation of auditable, ALCOA+ compliant datasets for FDA, EMA, and NMPA submissions requiring traceable particle count evidence.

FAQ

Does the A7000APS require manual dilution for high-concentration samples?
No. Its patented two-step automatic dilution system handles samples up to 10¹¹ #/mL without user intervention.
How does SPOS differ from laser diffraction in terms of resolution and accuracy?
SPOS measures each particle individually, enabling true number-weighted distribution and resolving adjacent peaks (e.g., 0.8 µm vs. 2 µm); LD provides only intensity-weighted averages and cannot resolve multimodal distributions below ~10% peak separation.
Is the software validated for use in FDA-regulated environments?
Yes—the Acona Control Suite is designed and documented to meet 21 CFR Part 11, USP , and ISO/IEC 17025 requirements for analytical instrument software validation.
Can the system analyze viscous or non-aqueous samples?
Yes. The fluidic design accommodates viscosities up to 500 cP and is compatible with common organic solvents, acids, and bases used in semiconductor and pharmaceutical manufacturing.
What calibration standards are supported?
NIST-traceable polystyrene latex (PSL) and silica microspheres ranging from 0.2 µm to 100 µm; optional certified reference materials for PFAT5 verification per USP .