Using Alternative Carrier Gases with Accelerated ASTM D2887 Simulated Distillation Analysis

Author(s): Katarina Oden, Barry Burger, and Amanda Rigdon
Restek Corporation

Published By: Restek Corporation

Year of Publication: 2016


Abstract: ASTM Method D2887 now allows for alternate carrier gases, so hydrogen or nitrogen can replace helium carrier gas for simulated distillation. Here, we show that with an MXT®-1HT SimDist column and Restek’s EZGC® online method translator existing methods using helium can be easily converted to either hydrogen or nitrogen carrier gas. Because retention times are preserved with proper method translation, there are minimal changes to peak identification tables which significantly simplifies method validation.

SilTite® μ-Union Connectors Stay Connected Under Pressure

GNPR2411-UNV_imagePress-fit style connectors work well for many applications, but the connector seal can be broken by extreme temperature and pressure cycling. In these situations, SilTite® μ-Unions are a better alternative as they create a permanent connection between fused silica analytical columns, guard columns, and retention gaps. SilTite® FingerTite technology provides easy installation and a reliable, leak-tight connection. Data quality can be improved by using these connectors because their zero-dead-volume design and deactivated metal construction ensure optimal peak shapes. Robust SilTite® μ-Unions are recommended for mass spectrometry work and any application with extreme temperature and pressure changes. Connector kits are available in six configurations that are designed to securely connect columns of either the same or different inner diameters. Each kit contains two SilTite® μ-Union connectors, five double-taper ferrules, and installation tools.

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Trident LC Column Protection System: Redesigned for Ruggedness and Ease of Use

picture of Trident guardsUnlike “one size fits all” guard systems, the Trident LC column protection system gives you the power to select the right level of protection for your analysis (filter only, guard cartridge only, or filter and guard cartridge). With three levels of protection and a variety of guard cartridges and cap frit filters, you can select the best combination to match your specific analytical needs. The economical, leak-free design provides a highly versatile combination of convenience, economy, and reliability.

This newly redesigned protection system features an improved, reusable direct connect holder, which is machined from specialized materials that create a seal that will withstand rigorous repeat use. A durable metal tip and replaceable PEEK ferrules allow easy installation onto the column without tools. The holder has also been engineered for easy removal of the cap frit filter, allowing you to replace it in just seconds. Finally, since the Trident LC column protection system is designed with exceptionally low dead volume, it has minimal effect on retention, peak shape, and efficiency.

Protect your analytical column and preserve method chromatography with a Trident LC column protection system.

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Restek to Offer May 3 Twitter Q&A Session on QuEChERS

#AskRestekOn Tuesday, May 3, Restek will host the next installment of the popular #AskRestek question-and-answer (Q&A) series on Twitter. This free, hour-long chat forum with Restek chromatography experts will start at 3:00 p.m. Eastern Time (12:00 noon Pacific Time) and will focus on QuEChERS sample preparation. Whether Restek customers or not, analysts are encouraged to follow the chat and join in with their own questions.

Panelists will include:

Mike Chang (@MC_Restek), Restek’s Product Marketing Manager (PMM) for Sample Preparation

Jonathan “Munch” Keim (@MunchAtRestek), Restek’s Education Coordinator as well as former Technical Service Manager and Sample Preparation PMM..

To stay informed leading up to the chat, follow @Restek, @MC_Restek, and @MunchAtRestek on Twitter.

At 3:00 p.m. EST (12:00 noon PST), on Tuesday, May 3, follow along by simply visiting and clicking All Tweets (app) or Live (browser). Periodically refresh your browser or Twitter feed to catch the latest posts.

People interested in receiving a reminder to join the chat can email us. Restek will send a reminder on the day of the event to those who sign up.

To join in the conversation, simply tweet a question or comment on Twitter and be sure to include the #AskRestek hashtag in your post.

For additional help using Twitter, you can also go to

#AskRestek is your direct line to Restek’s chromatography experts on Twitter. Follow Restek on Twitter now for this event and more valuable chromatography information:

GC-MS Analysis of Phthalates: Comparison of GC Stationary Phase Performance

Author(s): Dan Li, Rebecca Stevens, and Chris English
Restek Corporation

Published By: Restek Corporation

Year of Publication: 2016


Abstract: Phthalates are ubiquitous in the environment and have attracted attention due to their potential adverse impact on human health. For this reason, detection and separation of phthalates has become a necessity. Gas chromatography is an effective approach for separating phthalates, and it can be paired with several detection techniques, including electron capture (ECD), flame ionization (FID), and mass spectrometry (MS). In this study, Pro EZGC® gas chromatographic modeling software was employed to determine the optimal stationary phases and conditions for phthalate GC-MS analysis. The separation of phthalates was compared on seven different stationary phases: Rtx®-440, Rxi®-XLB, Rxi®-5ms, Rtx®-50, Rxi®-35Sil MS, Rtx®-CLPesticides, and Rtx®-CLPesticides2 phases. In all cases, 18 EPA- and EU-listed phthalates were analyzed in less than 6 minutes. In addition, an extended list of 37 phthalates was analyzed in less than 40 minutes using an optimized method. Both Rtx®-440, which is unique to Restek, and Rxi®-XLB columns showed the best resolution of the complex phthalate mixture.

Acknowledgment(s): The authors would like to thank Shimadzu Corporation for their consultation.

The Practical Chemist: Easy Ways to Generate Scientifically Sound Data

Author: Amanda Rigdon
Restek Corporation

Published By: Cannabis Industry Journal

Year of Publication: 2016


Abstract: The inaugural installment of a new column that will provide simple ways for laboratories to improve the quality of their chromatographic data, including instrument calibration and method development.

Electronic Maintenance Indicators for Gas Filters

SGT_CRMRestek’s electronic maintenance indicator is a monitoring device that warns you when planned maintenance for a gas filter is due. Simply attach it to the consumable that you would like to monitor and the device will progressively display real-time filter status, allowing analysts to follow a controlled replacement schedule instead of responding to “last minute” color changes from traditional indicators. Prevent unexpected downtime by controlling your routine maintenance schedule with an electronic maintenance indicator from Restek.

Electronic maintenance indicators are factory set to a 12-month interval, but can be custom configured by users to match their routine maintenance schedules. These devices are to be used with Super Clean, In-line, and Big Trap gas filters and come with a battery, a USB cable, and a mounting clip.

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