Stomacher Blender
Precision laboratory stomacher blender for gentle, uniform sample homogenization in sterile bags with programmable paddle action and 3-400ml processing capacity.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Stomacher Blender is a precision laboratory instrument designed for gentle, uniform homogenization of solid samples in sterile bags. Utilizing controlled paddle action with adjustable flapping speed (3-12 times/second) and spacing (0-50mm), this benchtop system processes samples from 3-400ml without cross-contamination risk. The instrument features programmable operation with 8-segment combination settings, allowing researchers to optimize extraction protocols for diverse sample types.
Key operational features include soft start functionality, anti-pinch safety mechanism with automatic stop, and voice prompt guidance for improved workflow efficiency. The system accommodates standard 17×30cm sterile bags (100 supplied) and operates continuously or for programmed durations up to 99 minutes 59 seconds. Power consumption is rated at 200W with universal AC110/220V compatibility.
How It Works
The stomacher blender operates on the principle of mechanical homogenization through controlled paddle action within sealed sterile bags. Two adjustable paddles create a rhythmic pummeling motion that gently breaks down sample structure while maintaining cell viability. The flapping mechanism generates uniform pressure distribution across the sample surface, ensuring consistent extraction without the heat generation associated with traditional blending methods.
Variable flapping speed (3-12 cycles per second) and adjustable paddle spacing (0-50mm) allow optimization for different sample consistencies and extraction requirements. The soft start function gradually increases paddle action to prevent sample splashing or bag damage during initial processing. This gentle mechanical action maintains the integrity of target organisms while effectively releasing them from solid matrices into the surrounding diluent.
The programmable 8-segment combination system enables complex extraction protocols with varying speed and duration parameters. This capability supports standardized methods requiring specific agitation patterns for different sample types or analytical requirements.
Features & Benefits
Automation Level
- semi-automated
Flapping Time
- 1s~99min 59s or continuous operation
Flapping Speed
- 3~12 times/s
Flapping Spacing
- 0~50mm adjustable
Effective Capacity
- 3~400ml
Program Setting and Storage
- 8-segment combination programming
Temp Control Range
- /
Disinfection Function
- /
Sterile Bag
- 17*30cm, standard 100 pcs
Voice Prompt Function
- Yes
Anti Pinch Function
- With automatic stop anti pinch function
Start Mode
- Soft start
Consumption
- 200W
External Size(W*D*H)
- 460*250*330mm
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Clinical Diagnostics
- Environmental Monitoring
- Food Science
- Microbiology
- Pharmaceutical QC
Power/Voltage
- AC110/220V±10%, 50/60Hz
Weight
- 19.0 kg
Dimensions
- L: 33.0 mm
- W: 46.0 mm
- H: 25.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Flapping Speed Range | 3-12 times per second with precise adjustment | Fixed speed or limited adjustment range in entry-level models | Variable speed optimization allows researchers to match processing intensity to sample requirements and organism sensitivity. |
| Paddle Spacing Adjustment | 0-50mm continuously adjustable spacing | Fixed spacing or limited adjustment positions | Accommodates diverse sample thicknesses from thin liquid-solid mixtures to thick solid materials without compromising extraction efficiency. |
| Programming Capability | 8-segment combination programming with individual speed and time settings | Simple timer functions or basic speed selection | Enables complex multi-phase extraction protocols required for standardized analytical methods and research applications. |
| Processing Capacity | 3-400ml effective capacity range | Limited to smaller volumes or single capacity range | Single instrument handles both small research samples and larger batch processing requirements without equipment changes. |
| Safety Features | Anti-pinch function with automatic stop and soft start | Basic safety covers or manual operation controls | Enhanced operator protection and equipment longevity through automated safety monitoring and controlled startup sequences. |
| User Interface | Voice prompt function with programming display | Silent operation with basic indicators | Audio guidance reduces operator errors and improves workflow efficiency in busy laboratory environments. |
This stomacher blender combines programmable multi-segment processing with comprehensive safety features and wide capacity range. The adjustable paddle spacing and variable speed control provide flexibility for diverse sample types while maintaining sterile processing conditions.
Practical Tips
Verify paddle spacing accuracy using calibrated spacers and confirm timing precision with external timing device during initial setup.
Why: Accurate spacing and timing ensure reproducible results across different operators and experimental sessions.
Clean paddle surfaces and chamber interior with 70% ethanol after each use and inspect for wear patterns monthly.
Why: Regular cleaning prevents cross-contamination between samples and early detection of wear extends equipment lifetime.
Remove excess air from sterile bags before processing and ensure uniform sample distribution within the bag.
Why: Proper sample positioning maximizes contact with paddle action and prevents incomplete homogenization or bag failure.
Start with conservative speed and duration settings for new sample types, then optimize based on extraction efficiency.
Why: Gentle initial processing protects sensitive organisms while allowing optimization for maximum recovery rates.
If processing appears uneven, check paddle alignment and adjust spacing to ensure uniform pressure across sample surface.
Why: Proper paddle alignment is critical for consistent extraction results and prevents localized over-processing or under-processing.
Always ensure safety cover is properly closed before starting operation and never attempt to override anti-pinch protection.
Why: Safety systems protect operators from moving paddle mechanisms and prevent equipment damage from improper loading.
Document paddle spacing, speed settings, and processing duration for each sample type to maintain protocol consistency.
Why: Standardized processing parameters enable reproducible results and facilitate method validation and transfer between laboratories.
Setup Guide
What’s in the Box
- Stomacher blender main unit
- 100 sterile bags (17×30cm)
- Power cord
- User manual and operation guide
- Paddle adjustment tools (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support available for operation and maintenance guidance.
Compliance
References
Background reading relevant to this product:
What sample types are compatible with the stomacher blender processing method?
The system is designed for solid or semi-solid samples that require gentle mechanical homogenization, including food products, environmental samples, pharmaceutical materials, and clinical specimens. Liquid samples alone do not benefit from stomacher processing.
How do I optimize paddle spacing and speed for different sample consistencies?
Start with minimal spacing (0mm) for soft samples and increase up to 50mm for thicker materials. Begin with lower speeds (3-4 cycles/second) for delicate organisms and increase to 8-12 cycles/second for tougher matrices requiring more aggressive extraction.
Can the instrument accommodate custom bag sizes or only the supplied 17×30cm bags?
The instrument is designed for the standard 17×30cm sterile bag format. Custom bag sizes may not fit properly between the paddles or maintain proper seal during processing. Consult product datasheet for alternative bag compatibility.
What maintenance procedures are required for consistent performance?
Regular cleaning of paddle surfaces and interior chamber with appropriate disinfectants, periodic calibration of timing mechanisms, and inspection of safety systems including anti-pinch function are recommended for optimal performance.
How does the 8-segment programming capability work for complex protocols?
Each segment allows independent setting of flapping speed and duration, enabling protocols that require varying intensity phases such as initial gentle mixing followed by more aggressive extraction and final gentle settling phases.
Is the instrument suitable for processing samples containing volatile compounds?
The sealed bag system minimizes volatile loss during processing, but proper ventilation should be maintained in the work area. For highly volatile samples, consider shorter processing times and lower speeds to minimize heating.
What is the typical processing time range for microbiological sample preparation?
Most microbiological homogenization protocols require 30 seconds to 2 minutes of processing, though the instrument supports programming from 1 second to 99 minutes 59 seconds to accommodate specialized extraction requirements.
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