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Zebron PLUS GC Columns - Improved Inertness, Better Peak Shape, Low Bleed, and Aqueous Stability

Brochures and specifications | 2019 | PhenomenexInstrumentation
GC columns, Consumables
Industries
Manufacturer
Phenomenex

Summary

Importance of the Topic


Gas chromatography demands stationary phases that combine chemical inertness, low bleed, and thermal stability to ensure accurate quantitation of volatile and semi-volatile compounds. Surface activity in traditional columns can cause analyte adsorption, peak tailing, and spectral degradation. The Zebron PLUS series addresses these challenges by employing advanced deactivation and bonding chemistries to deliver improved peak shape, reduced bleed at high temperatures, and compatibility with aqueous matrices. Such performance is vital for environmental monitoring, pharmaceutical quality control, food safety, and forensic analysis.

Objectives and Overview


The primary goal of the Zebron PLUS development was to create a family of general-purpose GC stationary phases that outperform conventional polysiloxane and polyethylene glycol columns. The series includes:
  • ZB-1plus (100% dimethylpolysiloxane)
  • ZB-5plus (5% phenyl/95% dimethylpolysiloxane)
  • ZB-5MSplus (5% phenyl-arylene/95% dimethylpolysiloxane)
  • ZB-624plus (proprietary phase for volatile organics)
  • ZB-WAXplus (100% polyethylene glycol with aqueous stability)
This summary reviews phase compositions, performance characteristics, and comparative results against market-leading alternatives.

Applied Methodology and Instrumentation


Column performance was assessed using standardized GC and GC-MS conditions across multiple analyte classes. Evaluation criteria included:
  • Inertness tests using acids, amines, phenols, and diols to measure peak symmetry and tailing factors.
  • Thermal bleed profiling from isothermal and temperature programmed runs up to 360 °C.
  • Aqueous injection reproducibility for ZB-WAXplus with repeated water or whiskey samples.
  • Residual solvent and VOC separations under EPA methods 524, 624, and 8260.
Instrumentation used:
  • Gas chromatographs equipped with FID detectors (325 °C) or mass spectrometers (transfer line 230–320 °C).
  • Carrier gases: hydrogen or helium at constant flows (0.7–2.4 mL/min).
  • Oven programs tailored to each application, typically ranging from subambient starts to final holds between 300–360 °C.
  • Zebron PLUS Single Taper and Straight Z-Liners for inlet deactivation consistency.

Main Results and Discussion


All PLUS phases demonstrated substantially lower bleed profiles versus competing columns, maintaining baseline stability at elevated temperatures. Key observations include:
  • ZB-1plus achieved the lowest bleed of 100% dimethylpolysiloxane columns up to 360 °C and highly symmetric peaks for active acids and bases.
  • ZB-5plus and ZB-5MSplus provided enhanced inertness for acidic/basic analytes and improved skew values in diol and organics separations.
  • ZB-624plus delivered exceptional sensitivity for high-boiling solvents, outstanding reproducibility, and fast residual solvent analyses in under 15 min.
  • ZB-WAXplus maintained 100% aqueous stability with reproducible separations of alcohols and flavor compounds over multiple injections.
Comparative chromatograms confirmed that Zebron PLUS columns often exceed the performance of Agilent, Restek, and Supelco equivalents in bleed resistance, analyte symmetry, and selectivity consistency.

Benefits and Practical Applications


The PLUS series enhances analytical workflows by reducing method development time and maintenance frequency. Applications span:
  • Environmental testing of pesticides, PAHs, and endocrine disruptors.
  • Pharmaceutical impurity screening, residual solvents, and drug metabolite profiling.
  • Food and beverage flavor analysis and quality control.
  • Forensic toxicology and cannabis terpene quantitation.
  • High-sensitivity GC-MS/MS in clinical and specialty chemical labs.
Engineered Self Cross-linking (ESC) bonding and fused silica deactivation improve column-to-column reproducibility, supporting validated methods and regulatory compliance.

Future Trends and Potential Uses


Advancements in stationary phase chemistry are expected to focus on:
  • Ultra-inert coatings for trace-level analysis of highly polar or reactive species.
  • Nanofabricated and micro-bore columns for faster separations with reduced solvent and sample requirements.
  • Integration with two-dimensional GC and high-resolution MS for comprehensive profiling.
  • AI-driven method optimization tools that tailor thermal programs to specific compounds on the fly.
  • New polymer backbones to extend thermal limits beyond 400 °C and expand chemical compatibility.

Conclusion


The Zebron PLUS family represents a significant step forward in GC column technology, combining low bleed, enhanced inertness, and aqueous stability across a versatile lineup. By outperforming legacy phases, these columns streamline sensitive analyses in diverse fields, reduce downtime, and support rigorous quality standards, making them valuable tools for modern analytical laboratories.

References


No literature references were provided in the original material.

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