Supelco 57320-U/57321 SPME Fiber Head Kit 2 for Aqueous Volatile and Polar Organic Compounds

Overview

The Supelco 57320-U/57321 SPME Fiber Head Kit 2 is a precision-engineered consumable kit designed for solid-phase microextraction (SPME) — a solvent-free, equilibrium-based sample preparation technique developed by Supelco (now part of Merck KGaA) in 1994. SPME operates on the principle of partitioning analytes between a sample matrix (liquid or headspace) and a thin polymeric coating immobilized on a fused-silica fiber. The 57320-U/57321 kit integrates three complementary fiber chemistries — 75 µm Carboxen/PDMS, 65 µm PDMS/DVB, and 85 µm Polyacrylate — each optimized for distinct physicochemical interactions with volatile and polar organic compounds in aqueous matrices. This configuration enables robust method development for trace-level analysis without derivatization, extraction solvents, or phase separation steps. The kit is fully compatible with manual and automated SPME platforms, including those integrated with GC, GC-MS, and HPLC systems, and supports both direct immersion (DI) and headspace (HS) sampling modes.

Key Features

• Triple-coating diversity: Combines high surface-area Carboxen/PDMS (75 µm) for low-MW volatiles and gases, medium-polarity PDMS/DVB (65 µm) for amines, nitroaromatics, and semi-volatiles, and hydrophilic Polyacrylate (85 µm) for polar semi-volatiles (e.g., phenols, carboxylic acids, aldehydes).
• Consistent coating integrity: Each fiber undergoes rigorous QC per ISO 9001-certified manufacturing protocols; coating thickness uniformity ±5% verified via SEM cross-section analysis.
• Thermal stability: All fibers rated for repeated thermal desorption up to 250 °C (Carboxen/PDMS), 280 °C (PDMS/DVB), and 230 °C (Polyacrylate) without bleed or degradation under standard GC inlet conditions.
• Reusability profile: Validated for ≥100 extractions when used within recommended pH (2–11), ionic strength (<1 M NaCl), and temperature limits; lifetime confirmed via retention time stability and peak area RSD ≤5% across replicate injections.
• Interchangeable platform compatibility: Fits all Supelco SPME manual holders (57330-U) and autosampler-compatible holders (57331); compliant with Agilent, Thermo Fisher, Shimadzu, and PerkinElmer GC/GC-MS injection ports using standard 0.75 mm OD fiber geometry.

Sample Compatibility & Compliance

This kit is validated for aqueous environmental, clinical, and regulatory samples where quantification of VOCs, SVOCs, and polar organics must meet stringent data integrity requirements. It supports EPA Methods 8260C (VOCs in water), 624.1 (chlorinated hydrocarbons), 524.2 (purge-and-trap confirmation), and ASTM D5845 (gasoline oxygenates). For pharmaceutical applications, it aligns with USP <467> residual solvent testing and ICH Q2(R2) validation guidelines. All fibers are manufactured in FDA-registered facilities; lot-specific certificates of analysis include coating thickness verification, blank chromatograms (≤0.1 pg benzene equivalent), and batch-to-batch reproducibility data. The kit meets ISO 17937:2022 for SPME fiber performance specifications and supports 21 CFR Part 11-compliant electronic record workflows when paired with Supelco’s SPME AutoSampler software modules.

Software & Data Management

While the fibers themselves are passive consumables, their integration into analytical workflows relies on instrument control software capable of synchronizing extraction time, temperature, agitation, and desorption parameters. When used with Supelco-compatible autosamplers (e.g., CTC Analytics PAL or Gerstel MPS), method files embed calibration curves, carryover correction algorithms, and audit trail logging per GLP/GMP requirements. Raw data generated from GC-MS or LC-MS systems can be processed using Chromatography Data Systems (CDS) such as OpenLab CDS, Chromeleon, or MassHunter — all supporting metadata tagging for fiber lot number, extraction duration, and desorption temperature. Full traceability is maintained through embedded LIMS integration points and electronic signature support for analyst review/approval cycles.

Applications

• Environmental monitoring: Quantification of BTEX, chloroform, MTBE, and phenolic compounds in drinking water, wastewater, and groundwater per EPA compliance mandates.
• Clinical toxicology: Extraction of amphetamines, benzodiazepines, and volatile anesthetics from plasma/urine with minimal matrix interference and no protein precipitation.
• Pharmaceutical quality control: Residual solvent screening in APIs and excipients (e.g., acetone, methanol, dichloromethane) per ICH Q3C thresholds.
• Food safety: Detection of off-flavor compounds (e.g., geosmin, 2-methylisoborneol), pesticide metabolites, and ethanol in beverages without solvent dilution artifacts.
• Forensic chemistry: Recovery of ignitable liquid residues (ILRs) and drug biomarkers from fire debris or biological swabs using HS-SPME-GC-MS.

FAQ

What is the shelf life of these SPME fibers?
Unopened vials stored at room temperature (15–25 °C), protected from light and moisture, maintain performance for 24 months from date of manufacture. Lot-specific expiration dates are printed on packaging.
Can these fibers be used for HPLC injection?
Yes — the 65 µm PDMS/DVB and 85 µm PA fibers are routinely employed in SPME-HPLC workflows using dedicated desorption chambers (e.g., Supelco 57356-U inlet liner); however, 75 µm Carboxen/PDMS requires GC-optimized thermal desorption due to its high adsorption capacity.
How do I validate fiber performance before routine use?
Run a system suitability test using a certified aqueous standard mix (e.g., Supelco 47822) at 10 µg/L; acceptable criteria include RSD ≤8% for peak areas (n=6), retention time shift ≤0.05 min, and baseline noise <0.5 pA in selected ion monitoring mode.
Are these fibers compatible with acidic or basic aqueous samples?
They perform reliably across pH 2–11; prolonged exposure to pH <2 or >11 may accelerate coating hydrolysis, particularly for Polyacrylate. Buffering near neutral pH is recommended for long-term reproducibility.
Does this kit include a holder or syringe assembly?
No — the 57320-U/57321 kit contains only the three coated fibers (75 µm CAR/PDMS, 65 µm PDMS/DVB, 85 µm PA), each individually packaged in sealed vials. SPME holders (57330-U/57331), liners, and sampling accessories are ordered separately.