DELEITE HM400S Sterile Stomacher Homogenizer

Overview

The DELEITE HM400S Sterile Stomacher Homogenizer is a microprocessor-controlled paddle-beater homogenization system engineered for reproducible, low-shear mechanical disruption of biological samples under aseptic conditions. Based on the standardized stomacher principle—where sample suspension is subjected to controlled reciprocating motion between two parallel plates—the HM400S delivers consistent cell lysis, microbial dispersion, and tissue homogenization without introducing thermal artifacts or excessive shear stress. Its design prioritizes containment integrity and operator safety, making it suitable for routine use in microbiology laboratories, food safety testing facilities, pharmaceutical QC environments, and clinical diagnostic settings where ISO 11133, AOAC 990.12, and USP / compliance is required. The instrument operates exclusively with certified sterile filter bags (17 × 30 cm), eliminating cross-contamination risks associated with reusable vessels and enabling rapid method transfer across batched analyses.

Key Features

• Microprocessor-driven 8-segment programmable protocol memory, supporting repeatable method execution across shifts and operators
• 4.3-inch capacitive touchscreen interface with intuitive icon-based navigation and real-time parameter feedback
• Adjustable beater frequency (3–12 cycles/sec) and variable gap spacing (0–50 mm) to optimize homogenization intensity for diverse sample matrices—from soft cheeses and leafy vegetables to frozen meat composites and environmental swab eluates
• Integrated soft-start activation and automatic pause/resume functionality for seamless intervention during processing
• Tempered glass viewing window with quick-release mechanism for visual monitoring without compromising sterility or interrupting operation
• Dual-layer safety architecture: hardware-based anti-pinch cutoff triggered by door obstruction detection, plus software-enforced interlock preventing operation with open chamber
• Voice-guided operational prompts—including cycle completion alerts, error codes (e.g., “Overload,” “Door Open”), and maintenance reminders—enhancing usability in noisy laboratory environments
• Corrosion-resistant stainless steel chamber and food-grade elastomeric beater sleeves ensure long-term compatibility with disinfectants (e.g., 70% ethanol, quaternary ammonium compounds) and repeated sterilization protocols

Sample Compatibility & Compliance

The HM400S accommodates standard 17 × 30 cm sterile filter bags conforming to ASTM D6319 and EN ISO 6887-1 specifications. It supports aqueous suspensions, semi-solid foods (e.g., dairy products, sauces, infant formula), environmental samples (soil extracts, water concentrates), and clinical specimens (stool, wound swabs, respiratory washes). All contact surfaces meet FDA 21 CFR Part 11 requirements for audit-trail-capable instrumentation when paired with compliant LIMS integration. The device complies with IEC 61010-1:2010 for electrical safety and EN 61326-1:2013 for electromagnetic compatibility. Routine validation per ISO/IEC 17025 Annex A.2 is supported through built-in calibration verification routines and traceable parameter logging.

Software & Data Management

While the HM400S operates as a standalone unit, its microcontroller logs timestamped run records—including program ID, duration, frequency setting, and fault events—to non-volatile memory (retention ≥10 years). Optional RS-232 or USB-to-serial interface enables export of CSV-formatted logs for integration into validated electronic lab notebooks (ELN) or quality management systems (QMS). Audit trail functionality satisfies GLP/GMP documentation requirements, including user identification (via optional external RFID badge reader), change history, and electronic signature support when interfaced with compliant middleware.

Applications

• Preparation of homogenous suspensions for aerobic/anaerobic plate counts (ISO 4833-1, ISO 6887-1)
• Microbial recovery from low-moisture foods and spices per AOAC 990.12 and FDA BAM Chapter 3
• Homogenization of environmental swabs and sponges for pathogen detection (e.g., Listeria monocytogenes, Salmonella spp.)
• Standardized tissue dissociation in pre-analytical workflows for molecular diagnostics
• QC sampling in pharmaceutical manufacturing for bioburden assessment per USP
• Research-grade sample preparation in academic microbiology and food science laboratories requiring method reproducibility across multi-site studies

FAQ

What sterile bag formats are compatible with the HM400S?
The HM400S is validated for use exclusively with 17 × 30 cm sterile filter bags meeting ASTM D6319 specifications. Non-standard bag dimensions may compromise sealing integrity and homogenization efficiency.
Does the HM400S support regulatory-compliant data archiving?
Yes—run logs are stored internally with timestamps and user-accessible via serial export. When integrated with validated QMS or ELN platforms, full 21 CFR Part 11 compliance—including electronic signatures and audit trails—is achievable.
Can the beater gap be calibrated in-house?
The 0–50 mm gap adjustment is mechanically indexed and does not require recalibration; however, periodic verification using certified gauge blocks (±0.1 mm tolerance) is recommended per ISO/IEC 17025 internal calibration procedures.
Is the HM400S suitable for BSL-2 applications?
Yes—when used with sealed, vented sterile bags and operated inside a biosafety cabinet, the HM400S meets containment requirements for BSL-2 agents per CDC/NIH guidelines. The tempered glass door and closed-chamber design prevent aerosol escape during operation.
What maintenance intervals are recommended?
Daily wipe-down of exterior surfaces with 70% ethanol; biweekly inspection of beater sleeve integrity and door seal compression; annual verification of motor torque consistency and touchscreen responsiveness per manufacturer’s service manual.