KEZHE AllSmall-40 Automated Stomacher Homogenizer

Overview

The KEZHE AllSmall-40 Automated Stomacher Homogenizer is a precision-engineered laboratory instrument designed for the gentle, reproducible, and contamination-free mechanical disruption of biological and food matrices. Based on the validated stomacher principle—applying controlled reciprocal motion to a sealed sample bag immersed in a buffered solution—the AllSmall-40 delivers consistent shear forces without generating excessive heat or cellular damage. Unlike rotor-stator or bead-beating systems, this device operates via external paddle-driven agitation, ensuring complete physical separation between the sample and instrument mechanics. This non-invasive architecture eliminates cross-contamination risks, removes the need for internal cleaning or sterilization cycles, and supports strict adherence to ISO 7218, AOAC 990.12, and FDA Bacteriological Analytical Manual (BAM) protocols for microbiological sample preparation. Its primary application domain includes pre-enrichment homogenization of food, environmental swabs, clinical specimens, and pharmaceutical raw materials prior to plating, filtration, or nucleic acid extraction.

Key Features

• Full stainless steel housing and contact surfaces for corrosion resistance, cleanability, and compliance with GLP/GMP facility requirements
• Adjustable stroke distance mechanism enabling optimized mechanical energy transfer across variable sample viscosities and volumes (3–400 mL)
• Programmable homogenization parameters: time (0–999 s), speed (0–9 strokes/sec), and progressive ramp-up profile to minimize thermal stress on heat-sensitive microbes
• Integrated Hall-effect safety interlock that halts operation instantly upon door opening—meeting IEC 61000-6-2 electromagnetic compatibility and EN 61000-6-4 functional safety standards
• Large transparent polycarbonate viewing window for real-time process monitoring without interrupting operation
• Dedicated leak-proof waste tray beneath the chamber to contain accidental bag breaches during high-speed cycles
• LCD interface with intuitive menu navigation, parameter recall, and event logging (timestamped start/stop)
• Compatible exclusively with certified sterile, low-binding stomacher bags (30 × 170 mm), eliminating carryover and reducing manual handling errors

Sample Compatibility & Compliance

The AllSmall-40 accommodates a broad spectrum of heterogeneous samples—including raw meat, leafy produce, dairy products, soil suspensions, biofilm-coated surfaces, and powdered pharmaceutical excipients—without requiring pre-grinding or solvent addition. Its gentle yet effective lysis preserves viability of stressed or fastidious organisms (e.g., Campylobacter jejuni, Salmonella Enteritidis, Listeria monocytogenes) essential for subsequent colony enumeration or molecular detection. The system meets critical regulatory expectations for microbiological testing workflows: it supports audit-ready documentation when paired with validated SOPs; enables traceable parameter settings required under ISO/IEC 17025 accreditation; and facilitates integration into FDA 21 CFR Part 11–compliant environments when connected to compliant LIMS platforms via optional RS-232 output.

Software & Data Management

While the AllSmall-40 operates as a standalone unit with embedded firmware, its LCD interface stores up to 20 user-defined protocols with name tagging and version timestamps. Optional serial communication (RS-232) allows bidirectional data exchange with laboratory information management systems (LIMS) or electronic lab notebooks (ELN), enabling automated capture of run metadata—including operator ID, sample ID, cycle parameters, and completion status—for full chain-of-custody documentation. Firmware updates are delivered via secure USB dongle, ensuring version control and cybersecurity alignment with NIST SP 800-53 Rev. 5 guidelines for embedded medical and laboratory devices.

Applications

• Preparation of homogenates for ISO 6887-1 and ISO 6887-2 compliant microbiological analysis of food and feed
• Standardized dilution and dispersion of environmental water filters and air sampling cassettes per EPA Method 1603
• Recovery of intracellular pathogens from macrophage infection models in immunology research
• Homogenization of frozen tissue biopsies for downstream qPCR or metagenomic sequencing library prep
• Dispersion of probiotic powders and fermented dairy products for viable count validation
• Extraction of mycotoxins or pesticide residues from composite agricultural samples prior to LC-MS/MS analysis

FAQ

Is the AllSmall-40 suitable for use in ISO Class 5 cleanrooms?
Yes—its fully sealed stainless steel chassis, absence of internal airflow paths, and lack of lubricated moving parts make it compatible with controlled environments when operated with certified sterile bags and validated cleaning procedures.
Can the instrument be calibrated or verified for performance consistency?
While no routine calibration is required per ISO/IEC 17025, users may perform periodic verification using standardized test bags containing known concentrations of microbeads or spores (e.g., Bacillus atrophaeus ATCC 9372) to confirm recovery efficiency and repeatability (RSD ≤ 8% across n=6 replicates).
Does KEZHE provide IQ/OQ documentation packages?
Yes—validated installation qualification (IQ) and operational qualification (OQ) protocols are available upon request, aligned with GAMP 5 principles and supporting regulatory submissions for pharmaceutical and clinical diagnostics laboratories.
What maintenance is required beyond routine wiping and bag disposal?
No scheduled maintenance is needed; the brushless DC motor and sealed gearbox are rated for >10,000 operating hours. Only visual inspection of door gasket integrity and waste tray cleanliness is recommended after each shift.