WIGGENS HG400VW Stomacher-Style Homogenizer

Overview

The WIGGENS HG400VW Stomacher-Style Homogenizer is an engineered solution for gentle, reproducible mechanical homogenization of solid and semi-solid biological samples under aseptic conditions. Based on the stomacher principle—where controlled reciprocating motion of dual paddles applies shear and compressive forces against a sealed sample bag—the instrument achieves uniform dispersion of microorganisms without thermal stress or cellular lysis beyond intended extraction. This method complies with standardized microbiological protocols for food safety testing (ISO 6887-1), pathogen isolation (ISO 11290-1), and pharmaceutical environmental monitoring (USP ). Unlike rotor-stator or ultrasonic systems, the HG400VW eliminates direct contact between sample and instrument surfaces, eliminating cross-contamination risk and reducing validation burden in GLP/GMP environments.

Key Features

• Brushless DC motor ensures maintenance-free operation, consistent torque delivery across speed range (20–600 cycles/min), and compliance with IEC 60034 efficiency standards.
• Tempered glass viewing window enables real-time visual confirmation of bag integrity, paddle alignment, and homogenization progress without interrupting the cycle.
• Adjustable beat distance accommodates varying bag thicknesses and viscosity profiles—critical for heterogeneous matrices such as meat trimmings, leafy vegetables, or fibrous tissue.
• Microprocessor-controlled interface supports programmable time (1 s–9 min 59 s) and speed settings, with memory retention for up to 10 user-defined protocols.
• Stainless steel housing with antimicrobial coating meets EN ISO 13845 requirements for cleanroom-compatible laboratory equipment and resists corrosion from disinfectants (e.g., 70% ethanol, sodium hypochlorite).
• Detachable paddles facilitate cleaning validation; no tools required for removal or reinstallation—reducing downtime during high-throughput workflows.

Sample Compatibility & Compliance

The HG400VW accepts standard sterile stomacher bags (e.g., WIGGENS 2125C25, 2150C25, 4125C15, 6125C15) ranging from 50 mL to 400 mL capacity. Its design accommodates samples requiring pre-cutting (≤10 × 10 mm), including raw meat, poultry, seafood, dairy products, plant tissues, clinical swabs, and cosmetic emulsions. The system conforms to regulatory frameworks governing microbiological analysis: ISO 6887-1 (preparation of microbiological samples), ISO 11290-1 (Listeria monocytogenes detection), ASTM D6978 (biosafety handling), and USP (microbial enumeration tests). All validated protocols assume use of single-use, gamma-irradiated bags—eliminating need for autoclaving, detergent rinsing, or residue verification per FDA 21 CFR Part 11 audit trails.

Software & Data Management

While the HG400VW operates via embedded firmware (no external PC dependency), its control logic supports full traceability: each run logs timestamp, selected program ID, actual duration, average beat frequency, and door-open events. Data export is enabled via optional RS-232 or USB-to-serial adapter (sold separately), compatible with LIMS platforms supporting ASCII-based log ingestion. Firmware updates are performed via secure firmware upgrade utility compliant with IEC 62443-3-3 cybersecurity guidelines. Audit trail functionality satisfies ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) for regulated laboratories subject to FDA or EMA inspections.

Applications

• Food microbiology: Enumeration of aerobic plate count (APC), Enterobacteriaceae, Salmonella, and Listeria from processed meats, ready-to-eat salads, and dairy powders.
• Clinical diagnostics: Recovery of fastidious pathogens (e.g., Campylobacter jejuni) from stool specimens and wound swabs using selective enrichment media.
• Pharmaceutical QC: Microbial load assessment of non-sterile APIs, excipients, and environmental monitoring swabs per USP and EP 2.6.12.
• Research applications: Preparation of homogenates for DNA/RNA extraction, ELISA antigen recovery, and flow cytometry suspension stability studies.
• Environmental testing: Processing of biofilm-coated surfaces, water filtration membranes, and soil slurries for culture-based or qPCR quantification.

FAQ

What sterilization methods are compatible with the HG400VW’s accessories?
All WIGGENS-certified stomacher bags (e.g., 2125C25, 4125C15) undergo gamma irradiation (25 kGy); the Acura® 810 manual dilutor and PE filters are autoclavable at 121°C for 20 minutes.
Can the HG400VW be integrated into automated lab workflows?
Yes—via optional digital I/O module (WIGGENS part #IO-HG400), enabling start/stop triggering and status feedback (door open/closed, cycle complete) to robotic arms or PLC controllers.
Is calibration required for routine operation?
No scheduled calibration is mandated; however, users must perform periodic performance verification using NIST-traceable reference bags containing known CFU counts (e.g., ATCC 25922 suspensions) per ISO/IEC 17025 clause 7.7.
How does the HG400VW ensure mechanical consistency across batches?
Each unit undergoes factory verification of paddle stroke amplitude (±0.5 mm tolerance), motor response latency (<50 ms), and timer accuracy (±0.1 s over 10-min interval) prior to shipment.
What safety certifications does the instrument hold?
CE marked per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU; RoHS 2011/65/EU compliant; electrical safety certified to IEC 61010-1:2010.