Nitrogen Evaporator for Toxicology Extract Concentration

What is the Nitrogen Evaporator for Toxicology Extract Concentration?

A nitrogen evaporator concentrates SPE eluates and liquid extracts by blowing heated nitrogen over the sample surface. It is used to dry down extracts and reconstitute them in a small volume before GC-MS or LC-MS/MS analysis.

Overview

The evaporator consists of a heated block or water bath with needles that direct a gentle stream of nitrogen onto each sample, with needle height adjustable to follow the solvent surface. Heat and gas flow speed evaporation while keeping analytes from splashing or overheating. Typical block temperatures are ambient to 100 °C, and 12 to 96 positions accommodate test tubes or plates. A 10 mL volume of methanol or ethyl acetate evaporates in 15 to 40 minutes depending on temperature and flow. Samples are then reconstituted in mobile phase or derivatization reagent for injection. Accuracy of temperature and careful control of drying time are important because volatile drugs, such as amphetamines, can be lost when dried with free base form. Adding a keeper solvent or acidifying with hydrochloric acid in methanol reduces this loss.

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?

• Heated block or bath from ambient to 100 °C
• Adjustable needles that follow the solvent level
• 12 to 96 positions for tubes or plates
• Individual flow control for each position in many models
• Solvent-resistant construction with gas filter

What are the technical specifications?

A typical nitrogen evaporator for toxicology extract concentration configuration offers positions of 12, 24, 48 or 96, temperature range of Ambient to 100 °C, temperature accuracy of ± 1 °C, gas of Nitrogen, 0.5–5 bar, needle adjustment of Manual or automatic height and tube size of 10–16 mm (or plate). 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 Nitrogen Evaporator for Toxicology Extract Concentration is used in SPE eluate concentration, preparation for derivatization, solvent exchange and trace drug enrichment. 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 Nitrogen Evaporator for Toxicology Extract Concentration?

Select an evaporator whenever extracts must be concentrated before analysis. Choose more positions for batch work and adjustable needles for varied volumes. In an RFQ, specify positions, temperature range, tube or plate format, nitrogen supply and fume extraction.

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.