DB-17ht

DB-17ht Column

High Temperature GC Columns

Agilent J&W DB-17ht is a high-temperature, mid-polarity GC column designed for demanding applications that require extended oven temperatures and enhanced selectivity. With a stabilized (50 percent phenyl)-methylpolysiloxane stationary phase, DB-17ht offers improved resolution for structurally similar analytes and thermally stable compounds that cannot be effectively separated on traditional nonpolar phases.

This column is engineered using a high-temperature polyimide-coated fused silica tubing that withstands rigorous thermal cycling up to 340 Â°C isothermal and 365 Â°C programmed. The bonded, crosslinked phase is solvent-rinsable for extended lifetime and maintains consistent retention behavior even under aggressive heating conditions.

DB-17ht is well suited for the analysis of triglycerides, complex natural products, thermally stable semivolatiles, and high-boiling analytes often encountered in specialty chemical, food, petrochemical, and environmental workflows. Its enhanced mid-polarity interaction delivers improved separation efficiency and sharper peak shapes compared to purely nonpolar high-temperature phases.

Key Definitions â–¸
(50 Percent Phenyl)-Methylpolysiloxane Phase
A mid-polarity stationary phase containing fifty percent phenyl groups, providing enhanced selectivity for structurally similar compounds and thermally stable analytes. This phase is designed to deliver improved separation efficiency at elevated temperatures.
High-Temperature Polyimide Tubing
A reinforced polyimide coating applied to fused silica to withstand extreme oven conditions. This tubing construction ensures mechanical stability and consistent retention at temperatures up to 340 Â°C isothermal and 365 Â°C programmed.
Mid-Polarity Selectivity
Chromatographic behavior between nonpolar and polar phases, providing enhanced separation for analytes that exhibit limited resolution on nonpolar high-temperature columns such as DB-1ht or DB-5ht.
Triglyceride Analysis
The process of analyzing large, thermally stable lipid molecules. DB-17ht’s mid-polarity phase improves separation efficiency for triglycerides and other complex, high-boiling compounds that require elevated-temperature operation.
Extended Temperature Limits
The operational temperature range of 40 Â°C to 340 Â°C (isothermal) or 365 Â°C (programmed), allowing efficient elution of high-boiling compounds while maintaining stable retention indices and low bleed.
Frequently Asked Questions â–¸
What applications are best suited for DB-17ht columns?
DB-17ht is ideal for extended-temperature GC workflows involving triglycerides, thermally stable semivolatiles, high-boiling compounds, natural products, and complex chemical matrices. Its mid-polar selectivity is especially effective for compounds that do not resolve well on nonpolar high-temperature phases.
How is DB-17ht different from DB-1ht or DB-5ht?
DB-17ht uses a mid-polar (50 percent phenyl) stationary phase, providing enhanced separation for structurally similar analytes. In contrast, DB-1ht and DB-5ht offer lower polarity and are best suited for nonpolar and semi-nonpolar analytes. DB-17ht provides greater selectivity for thermally stable polar and moderately polar compounds.
Can DB-17ht be used with GC/MS instruments?
Yes. DB-17ht performs reliably in GC/MS applications due to its low bleed at elevated temperatures and its ability to maintain stable baselines during extended high-temperature operation. This ensures high-quality mass spectral data and robust quantitation.
Is the DB-17ht column solvent rinsable?
Yes. DB-17ht is bonded and crosslinked, allowing solvent rinsing to remove heavy contaminants and extend column lifetime, especially when working with high-boiling or complex matrices.
What temperature limits does DB-17ht support?
DB-17ht operates from 40 Â°C up to 340 Â°C isothermal and 365 Â°C programmed. These extended limits support efficient elution of high-boiling compounds while maintaining robust column stability and low bleed characteristics.