PreeKem TOPEX+ Advanced Microwave Digestion and Extraction Platform

Overview

The PreeKem TOPEX+ is an advanced microwave digestion and extraction platform engineered for high-precision, high-throughput sample preparation in regulated and research-intensive laboratories. It operates on the principle of non-pulsed, continuous 2450 MHz microwave energy delivery within a rigorously engineered multimode resonant cavity. Unlike conventional systems relying on stochastic field distribution, the TOPEX+ integrates vector-based microwave field modeling and top-reflector architecture to concentrate electromagnetic energy directionally into the sample zone—enhancing energy coupling efficiency and thermal uniformity across up to 40 simultaneously processed vessels. This design supports both closed-vessel high-pressure microwave digestion (e.g., EPA 3051A, ISO 15587-1) and solvent-based microwave-assisted extraction (MAE) per ASTM D7699 and USP /. The system is purpose-built for applications requiring trace-level elemental analysis (ICP-MS/OES), organic contaminant recovery (GC-MS, LC-MS), and matrix-specific method validation under GLP or GMP frameworks.

Key Features

• Directional microwave compression technology based on vector field simulation and top-reflector cavity geometry, delivering improved energy density and spatial homogeneity.
• Laser-welded 316L stainless steel cavity with five-layer PFA (perfluoroalkoxy) interior coating—resistant to aqua regia, hydrofluoric acid, and aggressive organic solvents; backed by a 5-year cavity warranty.
• Modular rotor interchange system supporting three distinct vessel configurations: high-pressure digestion rotors (up to 150 bar), large-volume MAE rotors (100 mL capacity), and low-pressure open-vessel accessories—enabling seamless transition between EPA, AOAC, and ISO workflows.
• Dual-sensor thermal monitoring: bottom-mounted dual-infrared pyrometry combined with optional full-vessel continuous scanning for real-time, non-contact temperature profiling of all vessels.
• Integrated solvent leakage detection system with automatic shutdown protocol and active vapor containment—critical for chlorinated or low-boiling-point solvent applications (e.g., dichloromethane, acetone).
• Non-pulsed microwave generation via dual offset magnetrons, eliminating thermal overshoot and enabling precise kinetic control during ramp-hold segments.

Sample Compatibility & Compliance

The TOPEX+ accommodates diverse sample matrices—including biological tissues, soil/sediment, food composites, pharmaceutical excipients, polymer additives, geological digests, and metallurgical slags—without cross-contamination risk. All rotors are constructed from reinforced quartz, PTFE-TFM, or high-purity quartz-glass composites compliant with ISO 17025 reference material handling requirements. The system meets mechanical and electromagnetic safety standards per IEC 61000-6-3 (EMC) and IEC 61010-1 (lab equipment). Its software architecture implements full 21 CFR Part 11 compliance—including electronic signatures, audit trails, user access tiers (administrator/operator/observer), and immutable method/data logs—making it suitable for FDA-regulated QC labs and contract research organizations performing method transfer or validation studies.

Software & Data Management

The embedded operating system features a role-based, three-tier interface with intuitive workflow navigation and contextual help overlays. Method development includes slope heating profiles, dynamic power modulation, and programmable pressure ramp rate limits—supporting standardized protocols such as ASTM D5511 (anaerobic digestion) and EN 13656 (waste characterization). All temperature, pressure, power, and time parameters are logged at ≤1-second intervals and exportable in CSV or XML formats compatible with LIMS integration. Built-in video-guided operation tutorials reduce operator training time and improve inter-user reproducibility. Calibration routines include microwave power verification, IR temperature sensor drift compensation, and pressure transducer zero-point adjustment—all traceable to NIST-traceable references.

Applications

• High-throughput trace metal digestion for ICP-MS quantification in environmental monitoring (soil, water, air filters).
• Simultaneous multi-residue pesticide extraction from fruits, vegetables, and cereals per EU SANTE/11312/2021 guidelines.
• Pharmaceutical impurity profiling using microwave-accelerated derivatization and clean-up prior to HPLC analysis.
• Rapid leaching of heavy metals from construction materials and electronic waste in accordance with TCLP and SPLP protocols.
• Controlled depolymerization of synthetic polymers for additive identification and recycling feedstock assessment.
• Geochemical sample dissolution for rare earth element (REE) mapping in igneous and metamorphic rock samples.

FAQ

What types of microwave vessels are supported by the TOPEX+?
The platform accepts three interchangeable rotor systems: high-pressure digestion rotors (max. 300 °C / 150 bar), 100 mL MAE rotors with magnetic stirring, and open-vessel reflux modules—each certified for specific ASTM, ISO, and EPA methods.
Is the TOPEX+ suitable for accredited testing laboratories?
Yes. With full 21 CFR Part 11 software compliance, hardware-level security (locked firmware, tamper-evident logs), and ISO/IEC 17025-aligned calibration documentation, it meets accreditation requirements for CNAS, UKAS, and A2LA assessments.
How does the directional microwave compression improve analytical reproducibility?
By minimizing field nulls and hot/cold spots through top-reflector geometry and dual-magnetron phasing, the system achieves ±0.8 °C inter-vessel temperature deviation at 200 °C—critical for achieving RSD <3% in multi-sample digestions.
Can the TOPEX+ be integrated into an automated lab workflow?
Yes. RS-232, Ethernet, and USB interfaces support bidirectional communication with LIMS and robotic sample handlers. Optional API access enables custom scripting for unattended batch scheduling and result auto-import.
What maintenance is required for long-term cavity integrity?
The 316L cavity requires only periodic inspection of PFA coating integrity and cleaning with ethanol or dilute nitric acid. No routine magnetron replacement is needed—the system monitors output stability and alerts users when recalibration is indicated.