ZWQ-344 Rocking Shaker for Gel Staining and Destaining

Overview

The ZWQ-344 Rocking Shaker is a precision-engineered laboratory shaker designed specifically for low-shear, gentle agitation in post-electrophoresis processing workflows. Unlike orbital or reciprocating shakers, the ZWQ-344 employs a controlled rocking motion—tilting the platform along a fixed axis—to facilitate uniform solution exchange across gels, membranes, and blotting supports without mechanical stress or sample displacement. This makes it especially suitable for delicate applications such as Coomassie blue staining and destaining, silver nitrate fixation and development, autoradiography film processing (development, fixation, washing), nucleic acid and protein hybridization, and antigen–antibody incubations on nitrocellulose or PVDF membranes. Its compact footprint and low power draw (25 W) enable safe, continuous operation inside refrigerated chambers (4–8 °C) or environmental incubators (up to 50 °C), supporting temperature-sensitive protocols including cold-transfer hybridizations and long-duration antibody incubations.

Key Features

• Microprocessor-controlled rocking mechanism with PID feedback loop ensures stable, repeatable angular oscillation across the full frequency range (20–80 rpm) with ±1 rpm accuracy.
• Adjustable tilt angles (±5°, ±8°, ±10°, ±12°) allow optimization of fluid dynamics for varying gel thicknesses, membrane types, and reagent viscosities.
• Backlit LCD display provides real-time visibility of setpoints and actual values—including speed, angle, remaining time, and elapsed runtime—even under low-light lab conditions.
• Brushless DC motor delivers silent, maintenance-free operation with extended service life and consistent torque output across voltage fluctuations.
• Intelligent acceleration/deceleration profile prevents sudden starts or stops, minimizing gel slippage and preserving fragile immobilized biomolecules.
• Full parameter encryption and password protection prevent unauthorized modification of critical protocol settings during shared-lab use.
• Power-fail recovery function automatically resumes pre-interruption operation upon grid restoration—critical for overnight or multi-day assays.
• Robust aluminum-and-steel chassis with ergonomic, streamlined housing meets IP20 ingress protection standards and supports cleanroom-compatible wipe-down protocols.

Sample Compatibility & Compliance

The ZWQ-344 accommodates standard electrophoresis trays (up to 330 × 350 mm), mini-gel cassettes, hybridization bottles (up to 4 kg total load), and custom fixtures for microplates or blotting frames. Its non-corrosive stainless-steel platform surface resists common staining reagents (e.g., acetic acid, methanol, formaldehyde) and is compatible with ethanol- and bleach-based decontamination. While not certified for ISO 13485 or FDA 21 CFR Part 11 out-of-the-box, the device supports GLP/GMP-aligned documentation practices via timestamped parameter logging (when integrated with external data acquisition systems) and supports audit-ready operational consistency when used within validated laboratory workflows per ISO/IEC 17025 requirements.

Software & Data Management

The ZWQ-344 operates as a standalone instrument with embedded firmware; no PC connection or proprietary software is required for routine use. All operational parameters—including speed, tilt angle, timer duration, and real-time status—are stored in non-volatile memory and retained after power cycling. Optional RS-232 or USB-to-serial adapters (sold separately) enable integration with LabArchives, ELN platforms, or custom Python-based control scripts for centralized scheduling and electronic lab notebook (ELN) synchronization. The unit complies with electromagnetic compatibility (EMC) standards IEC 61326-1 and safety standard IEC 61010-1 for laboratory electrical equipment.

Applications

• Gel staining and destaining: Uniform dye penetration and removal from polyacrylamide and agarose matrices.
• Nucleic acid blotting: Pre-hybridization blocking, probe hybridization, and stringent wash steps on Southern/Northern blots.
• Protein immunodetection: Primary and secondary antibody incubations, chemiluminescent substrate application, and buffer exchange on Western blots.
• Radiographic film processing: Controlled agitation during developer, fixer, and rinse stages to reduce background fogging and improve signal-to-noise ratio.
• Cell culture support: Gentle mixing of low-viscosity media during transfection or cytokine stimulation protocols.
• Enzyme reaction incubations: Homogeneous mixing in low-volume enzymatic digestions where shear-induced denaturation must be avoided.

FAQ

Can the ZWQ-344 operate inside a cold room or refrigerator?
Yes—the unit is rated for ambient temperatures between 5 °C and 50 °C and features convection-cooled electronics, making it suitable for uninterrupted operation at 4 °C or 25 °C.
Is the rocking angle adjustable during operation?
No—angle selection must be made prior to startup using the front-panel keypad; changes require stopping the cycle and reinitializing.
Does the shaker include universal clamps or fixtures?
The base configuration includes a single flat platform (330 × 350 mm); optional accessories include gel tray holders, hybridization bottle racks, and microplate adapters—available through authorized distributors.
What happens if the timer reaches zero?
The unit halts motion immediately and activates both audible (beep) and visual (flashing LED) alerts; the display shows “END” and retains last-run parameters for recall.
Is calibration traceable to national standards?
The device does not include built-in calibration certificates, but rocking frequency and timer accuracy can be verified using NIST-traceable tachometers and stopwatch standards per ISO/IEC 17025 internal verification procedures.