How do Sample Preparation 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.
Which Sample Preparation variants are available?
- Positive-Pressure SPE Manifold for Drug Extraction — A positive-pressure SPE manifold pushes samples and solvents through SPE cartridges or 96-well plates with controlled gas pressure.
- Automated SPE Workstation for Toxicology — An automated SPE workstation performs sample loading, washing, drying and elution on cartridges or 96-well plates without operator intervention.
- Nitrogen Evaporator for Toxicology Extract Concentration — A nitrogen evaporator concentrates SPE eluates and liquid extracts by blowing heated nitrogen over the sample surface.
- Cryogenic Hair Pulverizer for Drug Testing — A cryogenic hair pulverizer grinds hair samples to a fine powder in sealed vials using steel balls, often chilled with liquid nitrogen.
- 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.
How do I choose the right variant?
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.
Where are Sample Preparation used?
Sample Preparation are specified in urine and blood extraction for toxicology, hair testing preparation, workplace drug testing confirmation, forensic casework extraction and oral fluid sample preparation.
Which standards and certifications apply?
Work with Sample Preparation is commonly governed by ANSI/ASB Standard 036, ISO/IEC 17025, ISO 15189, CLSI C62 and IEC 61010-1. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
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.
