Automated Liquid Handling Workstation for Toxicology Sample Preparation

What is the Automated Liquid Handling Workstation for Toxicology Sample Preparation?

An automated liquid handling workstation prepares calibrators, controls and samples for toxicology by pipetting, diluting, adding internal standards and reformatting into plates. It improves precision and traceability in routine drug testing workflows.

Overview

The workstation uses a robotic arm with one or more pipetting channels, disposable or fixed tips, and a deck for sample racks, reagent troughs, plates and optionally shakers, heaters and centrifuges. Methods are programmed to transfer volumes from 1 to 1000 µL, add internal standards, carry out protein precipitation or dilution, mix, and deliver prepared samples to 96-well plates or autosampler vials. Liquid level sensing and pressure monitoring detect errors such as clots or short samples, and barcode readers identify tubes and plates. Precision is typically under 2 percent CV for volumes above 10 µL. Audit logs record each pipetting action, supporting chain of custody. The system is flexible but requires method development, preventive maintenance and verification of pipetting accuracy, and solvents used must be compatible with the tip material.

How does it work?

Biological samples contain proteins, lipids and salts that interfere with chromatography and mass spectrometry, so drugs must be separated before analysis. Solid-phase extraction passes the sample through a sorbent bed that retains the drug, is washed to remove interferences and releases the drug with an elution solvent. Supported liquid extraction uses a diatomaceous earth support to perform liquid-liquid extraction without emulsions. Hydrolysis with acid, base or enzyme such as beta-glucuronidase releases conjugated drugs. Evaporation with heated nitrogen concentrates extracts, and derivatization may be needed for GC-MS. Hair is decontaminated, pulverized or cut and extracted to release incorporated drug. Automated liquid handlers pipette samples, internal standards and reagents with volume precision near 1 percent. Good preparation improves recovery, reproducibility and instrument uptime.

What are the key features?

• Robotic arm with multiple pipetting channels and disposable tips
• Volumes from 1 to 1000 µL with liquid level and clot detection
• Barcode reading of tubes and plates for traceability
• Optional shaker, heater and centrifuge on deck
• Audit log of every pipetting operation

What are the technical specifications?

A typical automated liquid handling workstation for toxicology sample preparation configuration offers pipetting channels of 1–8 or 96-channel head, volume range of 1–1000 µL, accuracy of ≤ 2 % at 10 µL, precision (CV) of ≤ 2 %, deck positions of ≥ 20 and tips of Disposable, filtered. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Automated Liquid Handling Workstation for Toxicology Sample Preparation is used in calibrator and control preparation, protein precipitation workflows, plate reformatting for LC-MS/MS and forensic traceable sample handling. Across the wider Sample Preparation class, laboratories also deploy it for urine and blood extraction for toxicology, hair testing preparation and workplace drug testing confirmation.

Which standards and certifications apply?

Relevant standards and methods include ANSI/ASB Standard 036, ISO/IEC 17025, ISO 15189, CLSI C62 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Validate each preparation method for recovery, matrix effects, precision and carryover, and use isotope-labeled internal standards added early. Keep consistent flow rates and drying times in SPE because variation changes recovery. Place evaporators and manifolds in a fume hood or use solvent vapor extraction, and follow biosafety procedures for blood and urine. Clean pipetting channels, needles and manifold ports regularly to avoid cross-contamination. Use calibrated pipettes and balances, verify temperature blocks with an independent thermometer, and document maintenance. For hair, decontamination steps must be defined and controlled. Keep chain-of-custody records and label every tube, plate and vial unambiguously.

How do I select the right Automated Liquid Handling Workstation for Toxicology Sample Preparation?

Select a liquid handler when manual pipetting is a precision or throughput limit, or when full traceability is required. For extraction-only needs, a dedicated SPE workstation is more focused. In an RFQ, specify channels, volume range, deck space, detection features, barcode reading and required integrations.

How does it compare with other Sample Preparation variants?

Choose according to sample type, volume and downstream technique. Positive-pressure manifolds suit laboratories running tens of SPE samples with consistent flow, while automated SPE workstations suit hundreds of samples and reduce hands-on time. Nitrogen evaporators are needed whenever eluates must be concentrated or solvents exchanged, and their throughput is set by the number of positions and block temperature range. Hair testing requires a cryogenic or ball-mill pulverizer to achieve reproducible extraction. Liquid handlers add precision and traceability for calibrators, internal standards and dilutions. Check plate formats, such as 96-well, compatibility with consumables, carryover control, solvent resistance and the ability to log operations. Consider operator safety, because organic solvents and biological samples are present.