HOGON AKF-CH6 Dedicated Coulometric Karl Fischer Moisture Analyzer for Hard Capsule Shells
| Brand | HOGON |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Coulometric Karl Fischer Moisture Analyzer with Integrated Heating Oven |
| Water Content Range | 3 µg – 199 mg H₂O (0.01 µg resolution) |
| Measurement Accuracy | ≥99.7% at 1000 µg H₂O |
| Repeatability | ≤0.3% RSD |
| Linearity Correlation Coefficient | ≥0.998 |
| Polarization Voltage Adjustment Range | ±10% |
| Titration Control Precision | 0.01 µg H₂O |
| Electrode Type | Electrolytic Electrode |
| Power Supply | 300 W, 220 V / 50 Hz |
| Data Storage | Internal non-volatile memory with timestamped method and result logging |
Overview
The HOGON AKF-CH6 is a fully integrated coulometric Karl Fischer moisture analyzer engineered specifically for pharmaceutical hard capsule shell analysis — yet broadly applicable across solid, semi-solid, and low-solubility biomaterials. Unlike conventional benchtop coulometric systems requiring external heating ovens or gas purging accessories, the AKF-CH6 embeds a precision-controlled sample evaporation module directly into the instrument architecture. It operates on the stoichiometric electrochemical generation of iodine via electrolysis of Karl Fischer reagent (I⁻ → ½I₂ + e⁻), where water quantitatively consumes iodine according to the classical reaction: I₂ + SO₂ + 2H₂O → 2HI + H₂SO₄. This enables absolute, reagent-free quantification traceable to Faraday’s law. Designed in strict alignment with ICH Q5C, USP , and EP 2.5.12 requirements for residual moisture control in dosage forms, the AKF-CH6 delivers sub-microgram-level detection (LOD: 3 µg H₂O) with metrological traceability suitable for GMP-compliant QC laboratories.
Key Features
- Integrated heating oven with programmable temperature ramping (ambient to 250 °C), PID-controlled恒温 stability ±0.5 °C, and intelligent over-temperature cutoff
- Dual-mode sample introduction: automated needle-puncture sealing for sealed vials + rotary cap sealing for open vessels — configurable per SOP requirements
- Heated carrier gas line (up to 120 °C) with real-time digital flow display (0–200 mL/min) to prevent condensation loss during vapor transfer
- High-resolution coulometric titration cell with adjustable polarization voltage (±10%) for optimal sensitivity across diverse electrolyte formulations
- 7-inch capacitive touchscreen interface with full numeric keypad, one-touch method launch, and context-sensitive guidance
- HOGON Smart Detection Technology: automatic baseline stabilization, drift compensation, and adaptive endpoint recognition based on real-time current slope analysis
- Comprehensive hardware protection suite: short-circuit detection, electrode overcurrent lockout, electrolyte level monitoring, and scheduled auto-shutdown
Sample Compatibility & Compliance
The AKF-CH6 accommodates heterogeneous pharmaceutical matrices without derivatization or solvent extraction, including hard gelatin capsules, HPMC shells, lactose monohydrate, microcrystalline cellulose, PVP K30, freeze-dried proteins (e.g., serum albumin, monoclonal antibodies), lyophilized diagnostics reagents, and organic solvents (acetonitrile, chloroform, glacial acetic acid). Its sealed headspace transfer design minimizes atmospheric moisture ingress and eliminates operator exposure to volatile solvents. All firmware and data handling comply with FDA 21 CFR Part 11 requirements for electronic records and signatures, supporting audit trails, user role-based access control (administrator/operator/analyst), and method versioning. Instrument qualification documentation (IQ/OQ/PQ protocols) is provided, and measurement uncertainty budgets are aligned with ISO/IEC 17025:2017 Annex A.5 for moisture determination in regulated environments.
Software & Data Management
The embedded HOGON MoistureSuite™ software provides GLP-compliant data governance: each analysis generates a tamper-evident .csv report containing method ID, operator login, calibration history, raw current-time curve, endpoint confirmation flag, calculated water mass (µg), %w/w, RSD, and environmental metadata (ambient T/RH, carrier gas flow). Up to 100 customizable methods can be stored onboard, each defining temperature profile, gas flow rate, stirring speed, endpoint threshold, and post-analysis purge duration. Data export supports USB flash drive and optional Ethernet connectivity for LIMS integration. Audit trail logs record all user actions — method edits, result deletions, parameter overrides — with timestamps and operator IDs, satisfying regulatory expectations for data integrity under ALCOA+ principles.
Applications
- Quantitative moisture verification of hard capsule shells pre- and post-coating per USP Stage III validation
- Residual solvent analysis in API intermediates (e.g., toluene, ethyl acetate) using headspace equilibrium transfer
- Lyophilized product characterization: mannitol/sucrose excipient hydration state, protein conformational stability correlation
- QC release testing of sterile ophthalmic solutions (e.g., sodium hyaluronate eye drops) via direct injection
- Stability-indicating assay for moisture-sensitive APIs (e.g., amoxicillin trihydrate, ibuprofen) under accelerated storage conditions
- Raw material acceptance testing for excipients including magnesium chloride hexahydrate, starch, and dextran
- Biopolymer moisture mapping: PLA/PGA suture degradation kinetics, PVA film hygroscopicity profiling
FAQ
Is the AKF-CH6 compliant with pharmacopoeial standards for capsule shell moisture testing?
Yes — it meets USP , Ph. Eur. 2.5.12, and JP 2.05 specifications for coulometric KF determination, including validation of linearity (r² ≥ 0.998), accuracy (≥99.7% recovery at 1000 µg), and repeatability (≤0.3% RSD).
Can the instrument handle highly viscous or non-soluble samples like collagen sutures or freeze-dried gels?
Absolutely — the heated headspace evaporation module ensures complete water liberation from thermally stable solids without dissolution, validated for materials up to 250 °C thermal tolerance.
Does the system support multi-user environments with audit-trail capabilities?
Yes — role-based authentication, electronic signatures, immutable audit logs, and 21 CFR Part 11–compliant data archiving are fully implemented in firmware.
What maintenance is required for long-term operational reliability?
Routine maintenance includes weekly electrolyte replacement, monthly electrode cleaning with ethanol, annual calibration verification using certified water standards (e.g., Hydranal® 1.00 mg/mL), and biannual carrier gas filter replacement.
Is method transfer possible from legacy KF systems?
Yes — method parameters (temperature ramp, gas flow, endpoint criteria) are exportable/importable via USB; HOGON provides cross-platform validation support documentation upon request.
