Interscience BagMixer 100W/P, 400W/P/VW & 3500W/P Series Pulsed-Action Stomacher Homogenizers

Overview

The Interscience BagMixer series comprises pulsed-action stomacher homogenizers engineered for rapid, reproducible, and contamination-free microbial extraction from solid and semi-solid food, environmental, clinical, and pharmaceutical samples. Operating on the principle of controlled mechanical percussion—where a motor-driven paddle applies rhythmic, bidirectional pressure pulses against a sterile sample bag—the system achieves efficient cell release without introducing shear-induced lysis artifacts common in rotor-stator or bead-beating methods. Unlike conventional blenders or high-shear homogenizers, the BagMixer maintains sample integrity by isolating the specimen entirely within a single-use, certified sterile bag, eliminating cross-contamination risk and eliminating the need for post-run cleaning or sterilization of internal components. Designed and manufactured in France, each model (100W/P, 400W/P/VW, 3500W/P) is calibrated to deliver consistent pulse energy and dwell time across its specified volume range, ensuring compliance with standardized microbiological enumeration protocols including ISO 6887-1, ISO 7218, AOAC 990.12, and FDA BAM Chapter 3.

Key Features

• Full stainless-steel construction (AISI 304) for corrosion resistance, cleanability, and long-term durability in regulated laboratory environments.
• Watertight dual-safety door mechanism with interlocked power cutoff—prevents operation unless both inner and outer doors are fully sealed, meeting IEC 61010-1 safety requirements.
• Progressive pulsation control: adjustable frequency (2–9 pulses per second, model-dependent) enables optimization for fragile cells (e.g., probiotics, spores) or resilient matrices (e.g., meat, cheese, soil).
• Transparent polycarbonate viewing window (standard on W-series models) allows real-time visual monitoring of bag integrity and homogenization progress without interrupting the cycle.
• Integrated waste collection tray captures minor bag leakage or condensate, preserving benchtop hygiene and supporting GLP-compliant documentation of containment integrity.
• Tool-free removable paddle assembly facilitates rapid inspection, decontamination, or replacement—critical for labs processing high-risk or allergenic samples.
• Programmable timer with digital display (10–360 s range for 100W/P; 30–210 s for 400/3500 series) supports method standardization and audit-ready parameter logging.

Sample Compatibility & Compliance

The BagMixer accommodates a broad spectrum of sample types—including raw meats, dairy products, leafy greens, infant formula, powdered pharmaceuticals, and environmental swabs—when used with Interscience’s ISO 11737-1–certified sterile filtration bags (BagFilter, BagPage, BagLight). Each bag variant is gamma-irradiated (25 kGy), DNAse/RNAse-free, and individually packaged with sterility indicators. The system supports full traceability under ISO/IEC 17025 and FDA 21 CFR Part 11 when paired with optional data-logging software and electronic signature modules. All models comply with European CE marking directives (EMC Directive 2014/30/EU, Low Voltage Directive 2014/35/EU) and meet IP22 ingress protection ratings for laboratory use.

Software & Data Management

While the base hardware operates via intuitive front-panel controls, optional Interscience LabManager™ software enables PC-based method management, remote start/stop, real-time pulse logging, and export of timestamped homogenization reports in CSV or PDF format. Audit trails record operator ID, date/time, selected program, actual pulse count, and door status—supporting GMP/GLP validation requirements. Software configurations include user-level access control (admin/operator/reviewer roles) and integration-ready APIs for LIMS synchronization.

Applications

• Microbiological testing: Enumeration of aerobic plate counts (APC), coliforms, Salmonella, Listeria monocytogenes, and Campylobacter per ISO 11133 and USP .
• Food safety laboratories performing pathogen enrichment preparation in accordance with ISO 16140-2 validation guidelines.
• Pharmaceutical QC labs conducting bioburden testing on non-sterile drug products (USP , EP 2.6.12).
• Environmental monitoring of water filters, air samplers, and surface swabs using membrane filtration or pour-plate techniques.
• Research applications requiring viable cell recovery from biofilms, fermented foods, or probiotic matrices where membrane integrity must be preserved.

FAQ

What distinguishes the BagMixer from traditional rotary-blade homogenizers?
The BagMixer uses non-invasive, low-shear percussion inside a sealed bag—avoiding blade contact, heat generation, and aerosol formation. This preserves microbial viability and eliminates carryover between runs.
Are BagFilter bags compatible across all BagMixer models?
Yes—BagFilter, BagPage, and BagLight bags are dimensionally and material-certified for use with 100W/P, 400W/P/VW, and 3500W/P units. Volume-specific bag formats ensure optimal pulsation efficiency.
Can the BagMixer be validated for regulated environments?
Yes—Interscience provides IQ/OQ documentation templates, calibration certificates traceable to national standards (COFRAC-accredited), and support for installation in FDA-inspected or ISO 13485-certified facilities.
Is temperature control available for sensitive samples?
An optional Peltier-cooled chamber (–5 °C to +25 °C) is available for 400W/P/VW and 3500W/P models to prevent thermal stress during extended homogenization of thermolabile cultures.
How often does the paddle require maintenance or recalibration?
Under normal use, the paddle requires only periodic visual inspection and wipe-down with ethanol. No scheduled recalibration is needed—the pulse frequency and timing are electronically governed and factory-verified at time of shipment.