SYFT TRACER™: NEXT-GENERATION VOLATILE IMPURITIES ANALYSIS FOR ENHANCED WORKFLOWS

Significance of the topic

Direct, rapid and reliable quantitation of trace volatile impurities in condensed-phase materials is critical for pharmaceutical quality control, excipient characterization and R&D. Methods that reduce sample preparation, eliminate derivatization, and increase throughput while maintaining quantitative accuracy enable faster decision-making, reduce bottlenecks in analytical pipelines, and support high-volume screening in regulated environments.

Objectives and overview of the study

This application note evaluates the performance and workflow impact of the Syft Tracer™, a next-generation selected ion flow tube mass spectrometer (SIFT-MS), for quantifying formaldehyde in a polyethylene glycol–based excipient (Gelucire 44/14). The main aims were to demonstrate: direct headspace quantitation without derivatization, long-term stability of quantitation (reducing calibration frequency), achievable sample throughput and time-to-first-result improvements compared with chromatography-based approaches.

Methodology

The study used multiple headspace extraction (MHE) sequences and static headspace sampling to evaluate repeatability and the feasibility of using a single-injection quantitative approach referenced to an MHE-based calibration performed earlier. Key procedural points:

• Sample: ~200 mg Gelucire 44/14 in 20 mL headspace vials.
• Incubation: samples incubated at 50 °C during six-cycle MHE sequences (agitated autosampler).
• Headspace sampling: 2.5 mL syringe heated to 150 °C; syringe flow 50 µL s-1; instrument nominal flow 420 µL s-1 with make-up N2 dilution accounted for.
• Instrument run time per sample: 120 s (analysis window ~50–80 s used for reporting).
• Quantitation: SIFT-MS quantitation of formaldehyde using the known literature reaction rate constant (no formaldehyde calibration standards or internal standard applied across the 86-day study), concentrations corrected only for sample mass in vial.

Used instrumentation

The analytical platform and supporting equipment comprised:

• Syft Tracer™ SIFT-MS instrument operated with helium carrier gas (next-generation SIFT-MS platform with enhanced sensitivity and stability).
• GERSTEL MPS Robotic Pro multipurpose autosampler with heated agitator head for MHE and autosampling.
• 2.5 mL heated headspace syringe and self-sealing septumless sampling head (GERSTEL).
• Make-up ultra-high-purity nitrogen for dilution control.

Main results and discussion

Performance highlights and analytical findings from the 86-day evaluation (two measurement runs: 13 and 27 days within the 86-day window):

• Direct detection: Formaldehyde was selectively detected via proton-transfer chemistry producing the H3CO+ product ion at m/z 31, leveraging SIFT-MS ultra-soft ionization for high specificity and minimal fragmentation.
• Calibration-free stability: Quantitation was performed using the literature reaction rate constant without performing formaldehyde calibrations throughout the study, demonstrating instrument stability over extended periods.
• Repeatability: Individual-injection repeatability (%RSD) ranged from ~0.31 to 3.4% across the study; full MHE calculations on a given day showed RSDs of ~0.9 to 6.6%.
• Reproducibility: Two runs produced highly similar concentrations with RSDs <5% between runs—well within the acceptance window for routine analysis.
• Temporal separation of calibration and routine analysis: The mean Day 0 MHE calibration factor applied across the run yielded single-injection results within ±20% of full six-injection MHE values for samples with consistent particle size and morphology, validating the approach for routine samples.

Benefits and practical applications of the method

The Syft Tracer™ workflow provides several operational and analytical advantages over chromatography-based approaches for volatile impurity analysis in condensed-phase matrices:

• Derivatization-free, direct headspace quantitation of formaldehyde avoids laborious chemical modification and associated artefacts.
• Reduced calibration frequency: long-term instrument stability allows calibration events to be scheduled infrequently (e.g., weekly or during low-use periods), decoupling calibration from daily sample throughput.
• High throughput: typical run-times and incubation times enable routine analysis capacities exceeding 220 samples per 24-hour period for formaldehyde in Gelucire, compared with under four samples/day for chromatography methods requiring full MHE per sample.
• Faster time-to-first-result: the SIFT-MS workflow produces the first quantitative result in under 90 minutes (including system checks and blanks), approximately four-fold faster than workflows that require daily MHE calibration with chromatographic analysis.
• Operational flexibility: a single hardware configuration accommodates multi-analyte workflows without inlet or column changes, supporting multi-team use and continuous 24/7 monitoring scenarios.

Future trends and potential applications

Based on the demonstrated performance, likely developments and uses include:

• Broader adoption in pharmaceutical QC for routine volatile impurity screens (residual monomers, aldehydes, nitrosamines) where rapid turn-around is valued.
• Integration with automated sample preparation and laboratory information management systems to support high-throughput regulated testing and audit trails.
• Scheduled, centralized calibration strategies (e.g., weekend calibrations) that free instrument time for routine testing during business hours.
• Expansion to in-process monitoring, environmental screening and fenceline or workplace monitoring where real-time trace detection is advantageous.
• Coupling SIFT-MS data with chemometric models for enhanced prediction of matrix effects and for automated quality decision-making.

Conclusions

Syft Tracer™ SIFT-MS delivers stable, specific and sensitive direct headspace quantitation of formaldehyde in Gelucire 44/14 without derivatization. The platform’s improved sensitivity (~50% over legacy instruments), enhanced stability and hardware optimizations permit reduced calibration frequency, high daily throughput (>220 samples/day) and substantially faster time-to-result (<90 min) compared with chromatography-based approaches. These attributes translate into transformative workflow benefits for routine volatile impurity analysis in industrial and pharmaceutical laboratories.

References

• Hastie C, Thompson A, Perkins MJ, Langford VS, Eddleston M, Homer N (2021) Selected ion flow tube-mass spectrometry (SIFT-MS) as an alternative to gas chromatography/mass spectrometry (GC/MS) for the analysis of cyclohexanone and cyclohexanol in plasma. ACS Omega 6(48):32818–32822.
• Langford VS (2023) SIFT-MS: Quantifying the volatiles you smell… and the toxics you don’t. Chemosensors 11:111.
• Perkins MJ, Hastie C, Whitlock SE, Langford VS (2023) Head-to-head comparison of Class 2A and 2B residual solvents analysis using SIFT-MS and GC-FID. Syft Technologies application note.
• Perkins MJ, Langford VS (2021a) Application of routine analysis procedures to a direct mass spectrometry technique: Selected ion flow tube mass spectrometry. Rev. Sep. Sci. 3(2):e21003.
• Perkins MJ, Langford VS (2021b) Standard validation protocol for selected ion flow tube mass spectrometry methods applied to direct headspace analysis of aqueous volatile organic compounds. Anal. Chem. 93:8386–8392.
• Perkins MJ, Langford VS (2022a) Multiple Headspace Extraction-[SIFT-MS]. Part 1: A Protocol for Method Development and Transfer to Routine Analysis. Rev Sep Sci. 4(1):e22001.
• Perkins MJ, Langford VS (2022b) Simple, Rapid Analysis of Formaldehyde Impurities in Gelucire Excipient using SIFT-MS. Syft Technologies application note.
• Perkins MJ, Langford VS (2022c) Simple, rapid analysis of N-Nitrosodimethylamine (NDMA) impurity in ranitidine products using SIFT-MS. Syft Technologies application note.
• Smith D, Španěl P, Demarais N, Langford VS, McEwan MJ (2023) Recent developments and applications of selected ion flow tube mass spectrometry (SIFT-MS). Mass Spec. Rev.
• Španěl P, Smith D (2008) Quantification of trace levels of the potential cancer biomarkers formaldehyde, acetaldehyde and propanol in breath by SIFT-MS. J. Breath Res. 2:046003.