一般的な興味

Articles

A Primer on Control Systems

This article provides an introduction to control systems and discusses how control variables influence process variables. Topics include open loop, closed loop, and PID control systems. Simulations illustrate overshoot and undershoot around the setpoint during process control.

A Primer on Gas Flow

A basic understanding of gas flow principles is fundamental to obtaining accurate flow measurements. This primer contrasts mass flow and volumetric flow regimes, and illustrates the effect of flow impedance and loading on the flow source in gas chromatography.
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Activity in the FID Detection Port: A Big Problem if Underestimated

It is commonly known in gas chromatography that many problems can be traced to the injection system (e.g., sample, syringe, inlet), which is often a primary place to look at possible issues. This is a valid statement as 80% of “trouble” is related to injection conditions. One must also be aware that activity may be caused by other contributions. For instance, if we look at nonsymmetrical peaks, there are more important areas to look at. Not only can the columns be overloaded or poorly deactivated, but the contribution of the detector also has a huge impact on peak shape and response. Here, it is shown that flame tips can adsorb up to 90% of components and cause tailing of polar as well as basic/acidic components. Though it looks like columns are not performing, it’s the detector that is the problem.
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Agilent GC-MS Maintenance: Restek’s Quick Reference Guide

With Restek's guidance and our comprehensive line of high-quality GC inlet supplies, performing proper GC inlet maintenance to help maximize your lab's uptime and ensure accurate, reproducible data is as easy as replacing a liner (and a few other items).
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Analysis of Gases via Gas Chromatography: Nitrous Oxide

Because nitrous oxide is a gas under ambient conditions, it will not be retained by liquid stationary phases unless subambient conditions are established, which can be expensive to set up and difficult to maintain. Using an adsorbent stationary phase, such as porous polymers, is a better approach because adsorbents provide very high retention and allow gases to be separated at temperatures above ambient. This article explores best practices and demonstrates the separation of nitrous oxide on several different adsorbent phases.
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Analyze CO and CO2 at ppb Levels Easily and Accurately using a Restek Methanizer for Agilent GCs

The new Restek methanizer (CH4izer) for Agilent GCs allows ppb-level determination of CO and CO2 using a cost-effective FID instead of more expensive instrumentation. This unit is factory set to 380 °C (± 1 °C) for optimal catalytic conversion, but can be easily adjusted as desired. Less cumbersome than other models, the Restek methanizer is designed for easy installation and fast catalyst tube replacement so you spend more time analyzing samples and less time on maintenance. (PDF - 2093kB)
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Application and Limitation of Using Adsorbents as Stationary Phases in Gas Chromatography for the Separation of Volatile Compounds

Adsorbents have unique separation characteristics. The adsorption process allows very volatile components to be retained at higher temperatures that create easier conditions to quantify very volatile compounds. Several adsorbents have found wide application in industry. Molecular sieves are used for the separation of inert gases, and porous polymers based on styrene divinylbenzene are used for the separation of the more polar compounds. These adsorption materials have also been made available in capillary columns where the retention is generated by a layer of adsorbent particles on the inside wall of a capillary. Such capillaries are called PLOT (Porous Layer Open Tubular) columns and are highly efficient. They produce high theoretical plate numbers and have high operation temperatures. The challenge of PLOT columns is to stabilize the layer as particles can be dislodged from the layer and form restrictions. Such restrictions can be measured and the values can be used to control PLOT quality. It was also possible to apply the PLOT technology in metal columns (MXT), allowing the process type of applications to take full advantage of these developments.
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Changing from Helium to Nitrogen and Maintaining the Separation Efficiency in the Same Analysis Time

For several reasons, there is interest in replacing helium with a different carrier gas in gas chromatography. Hydrogen is the obvious choice, but there is concern about safety and reactivity. It is also possible to use nitrogen, but this is often not considered because it has a low optimal flow and velocity. Here, we will show that it is possible to replace helium with nitrogen as the carrier gas while separation, peak elution order, analysis time, response, and even oven temperature conditions can be kept the same.
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Developing Fast GC Methods—Avoiding Changes in Elution Order or Separation Efficiency

Recently, I spoke with a customer who was trying to speed up an analysis. He had decided to use a shorter column with a smaller diameter to maintain separation efficiency and decrease run times by a factor of two. However, using this approach, the customer did not get the same separation as peaks moved, even swapping direction. What was happening and how could the risk of peak swapping be reduced? In this article, we discuss the phenomena of relative peak shifting, which can occur because of a possible change in the elution temperature.
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Diagnosing and Preventing High Back Pressure in LC Systems

High back pressure is one of the most common problems encountered in LC systems. Here, we review the typical causes, give tips on troubleshooting, and provide details on routine maintenance parts and practices that can help you avoid unplanned instrument downtime.

Dual Vespel Ring Inlet Seals

Restek's Dual Vespel Ring inlet seal gives you a better seal with fewer parts. Data show that the soft Vespel material has a much lower leak rate than a metal seal. Also, since less torque is required for installation, user variability is reduced.
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Dynamic Duo brochure

Protect your instrument and improve data quality with this powerful pair from Restek. Checking for leaks with our new electronic leak detector and verifying flows with a ProFLOW 6000 flowmeter before you analyze samples helps you avoid costly problems later. (PDF - 1719kB)

Effect of Organic Solvent on Selectivity in LC Separations

Switching the organic modifier in LC mobile phases can have significant effects on retention and selectivity. This article explores what you need to consider before changing from acetonitrile to methanol or vice versa.
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Electron Multipliers for Mass Spectrometry

The multi-dynode approach of all ETP electron multipliers results in longer lifetimes—and better sensitivity—compared with channel electron multipliers (CEM) or continuous-dynode multipliers. Optimized ion and electronic optics help ensure maximum performance, while the increased surface area offers enhanced sensitivity and extended operational life. (PDF - 0kB)
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Eliminate Cross-Contamination with New Resprep Quick-Replace Vacuum Manifolds

Cross-contamination of samples run in series through typical SPE vacuum manifolds is a common problem for sample prep labs. New Resprep Quick-Replace vacuum manifolds eliminate this risk because they contain a disposable valve liner that can be quickly and easily replaced between samples, ensuring a clean flow path for every extraction. (PDF - 1307kB)

Rxi-35Sil MSカラムを用いたGC-MSによる
アゾ色素アリルアミン類の優れた分離

ここでは、Rxi-35Sil MSカラムを使用したこれらのアリルアミン類の高速GC-MS分析法の検討をおこないました。一部のアゾ色素は還元開裂することで発がん性のあるアリルアミン類を生成します。分解によってこのようなアミンを形成するアゾ色素が衣類に使用されていると潜在的な暴露リスクとなり、EUでは化学物質の登録、評価、許可および制限に関する規則EC 1907/2007(通称REACH規制)により規制されています。加えてOEKO-TEX Standard 100に基づく認定では、繊維製品に(EC)1907/2006を遵守することを求めています。Rxi-35SilMSカラムの最適な選択性、高い効率と不活性度は、微量アリルアミン類のハイスループットGC-MS分析において理想的な選択となります。

Flip Seal Inlet Seals
Frequently Asked Questions

New reversible Flip Seal inlet seals from Restek last longer than other inlet seals. Simply use—flip—then use again. Review our Flip Seal FAQ page for quick answers on how to install and optimize use of this innovative new GC inlet seal.
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Gas Management for GC Labs

Setting up and maintaining an effective gas management system is critical for GC labs. This guide provides an overview of gas management and helps you determine which components are right for your lab. Includes gas generators, regulators, tubing, fittings, gas purifiers, and more. (PDF - 5040kB)

Gas Management Supplies for GC Labs

Setting up and maintaining an effective gas management system is critical for GC labs. This guide provides an overview of gas management and helps you determine which components are right for your lab. Includes gas generators, regulators, tubing, fittings, gas purifiers, and more.

GC Column Installation Made Easier with Extended Reducing Nuts for the Agilent Split/Splitless Inlet

In order to make GC column installation easier when using an insulating cup in your Agilent split/splitless GC inlet, standard reducing nuts should be replaced with extended reducing nuts. This simple change improves visibility of the nut during column installation and allows you to reap the benefits of using the insulating cup.
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GC Columns Installation Guide

The Restek Innovations and Technical Services specialists have found this to be a reliable sequence for avoiding problems when preparing and installing a capillary GC column. (PDF - 0kB)

GC Inlet Maintenance: Restek’s Quick-Reference Guide

With Restek's guidance and our comprehensive line of high-quality GC inlet supplies, performing proper GC inlet maintenance to help maximize your lab's uptime and ensure accurate, reproducible data is as easy as replacing a liner (and a few other items).

フタル酸エステル類のGC-MS分析: GC液相の特性比較

このアプリケーションノートでは、フタル酸分析で最も一般的に使用される7つのカラムの比較をおこないました。 Rtx-440およびRxi-XLBカラムは、18の規制されたフタル酸エステルと40におよぶ拡張リストの両方に対する高速分析時間と良好な分離という点で、フタル酸GC-MS分析の推奨選択肢となります。 GC-ECDの分析では、Rtx-440およびRxi-35Sil MSカラムのデュアルカラムセットが推奨されます。
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Get a Quicker Cleanup: Resprep SLE Cartridges and 96-Well Plates

New Resprep SLE cartridges and 96-well plates effectively remove proteins, phospholipids, and salts in three simple steps: just load, wait 5 minutes, then elute. (PDF - 1168kB)
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Get Better Reproducibility, Accuracy, and Separation with Derivatization Reagents from Restek

• Improve volatility, thermal stability, and peak shape for more reproducible results. • Decrease adsorption and activity for improved accuracy. • Increase molecular weight for better separations. (PDF - 452kB)

GCアクセラレータキットとEZGCメソッドトランスレータによる既存のGC-MS分析の高速化

現在の分析条件をより短くする必要性を感じていますか?EZGCメソッドトランスレータを使うと分離は同等のまま、分析時間の短縮が可能です。カラムサイズを小さくし、既存のメソッドを適切に変換することで分析時間は短縮できます。Agilent GC-MSユーザーの方は、GCアクセラレータキットをオーブンに取付けることで、さらなる高速化をはかれます。

Get More Uptime with Restek’s Long-Life ESI Electrode for Sciex Turbo V Sources

The harsh environment inside an MS source takes its toll on ESI electrodes and, once they corrode, sensitivity drops, runs fail, and productivity halts while the instrument is offline for maintenance. The testing detailed here shows that Restek Long-Life ESI electrodes for Sciex Turbo V sources provide equivalent LC-MS/MS performance over significantly longer lifetimes.
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Ghost Peaks in Gas Chromatography Part 1: The Carrier Gas and Carrier Gas Lines

We get always a number of inquiries from customers who see peaks show up in their chromatogram when they do not inject them. There are several sources for these “ghost peaks,” which we will discuss in several articles.
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Ghost Peaks in Gas Chromatography Part 2: The Injection Port

In the last issue, we discussed possible sources of ghost peaks related to the carrier gas and gas lines. Here, we move into the injection port itself, as it is a big source of trouble. The injection of the sample is responsible for >80% of the troubles that are experienced in gas chromatography. In the process of rapid evaporation of the sample, several things can go wrong.
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Ghost Peaks in Gas Chromatography Part 3: Sample Contamination and Ghost Peaks Formed by the Stationary Phase Itself

In the last issue, we discussed possible sources for ghost peaks related to the carrier gas and the gas lines. The injection port septa and O-rings can also be a source for ghost peaks. Here we look at the sample itself and the different contaminants that can result in unwanted “extra” peaks. Also, the stationary phase in the column can play an interesting role in ghost peak formation.
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Ghost Peaks in Gas Chromatography Part 4: Reactivity in the Column While Doing Separations

In the latest issues, we discussed possible sources of ghost peaks related to the carrier gas, gas lines, injection port and parts, degradation, and the column. Here we move onto several other contributions that are not as obvious as the former options.
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Ghost Peaks in Gas Chromatography Part 5: Impact of Injection and Oven Parameters during Injection

In gas chromatography, 80% of the trouble is caused by the injection system. Also, here we have seen that by degradation of sample components, O-rings, backflash, and septa, extra peaks can be generated. Besides this, the conditions used for injecting the sample can also produce extra peaks.
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Guide to GC Column Selection and Optimizing Separations

Simplify GC column selection and optimizing GC separations with this companion guide to our popular posters. Detailed discussion of the resolution equation and how it relates to column factors such as stationary phase selectivity, film thickness, internal diameter, and length teach you how to choose the best GC column for your separation easily and effectively. Also includes GC troubleshooting. (PDF - 2946kB)
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High-Performing Restek PAL SPME Fibers

High-Performing Restek PAL SPME fibers are optimized for PAL system autosamplers and are compatible with most GC inlets. (PDF - 2944kB)

How Much Sensitivity is Needed in a Leak Detector?

Restek's Electronic Leak Detector is sensitive enough to find leaks below instrument pressure decay test levels and is available at a fraction of the cost of other hand-held units.

HILICモード使用上の注意点
HILICメソッドでよく起こる問題を回避するために

HILICモードを試したことがある場合でも、初めておこなう場合でも、逆相モードとHILICモードの間には考慮すべき大きな違いがあります。ここでは、HILICモードでよくある一般的な問題と、それらを避け、このモードをうまく実行する方法について説明します。

GC注入口ライナーの選び方:注入口タイプ別の簡単なセレクションガイド

あなたは、どうやってあなたのアプリケーションにマッチしたGC注入口ライナーを選んでいますか?たくさんの選択肢があり、正しいライナーを選択することが、難しいかもしれません。このテクニカルノートは、最適なGC注入口ライナーを選択するため、各注入法を元に簡便に選べるように示しています。ライナーの選択にお役立てください。

How to Condition a New Capillary GC Column

Proper conditioning is essential for optimal performance from a capillary GC column, but inexperienced chromatographers might not know the proper procedures for installing and conditioning a new column. Here, we summarize our recommendations for installation and conditioning procedures.

How to Diagnose GC Septum Bleed Contamination Sources: Could it be Your Vial Cap?

In gas chromatography, septum bleed is often attributed to the inlet septum, but the vial cap septum can also be a source. Fortunately, it’s easy to determine which septum is causing the problem and by identifying it so you can avoid the time and trouble of unnecessary inlet maintenance. Read on to learn how to identify vial cap septum bleed and also how to choose a GC septum that will reduce the problem.

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How to Get More Analysis Out of Your GC System

A common question we get asked by our customers is how they can get longer column lifetime. This can be from a cost perspective (column price) or from a maintenance perspective (downtime, labor, calibration).
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Impact of the GC Parameters on the Separation—Part 1: Choice of the Stationary Phase

In this series, we will discuss the impact of different parameters on the actual separation. We will do this by discussing how they impact and then explain the impact with some practical examples. In GC, there are seven important parameters that we can choose to get a separation. All parameters have an impact and selection of a certain parameter has an impact on the separation.
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Impact of the GC Parameters on the Separation—Part 2: Choice of Column Internal Diameter

In part 1 of this series, we focused on how to select the stationary phase, which is one of the seven important parameters we need to understand. Once the stationary phase is selected, the column dimensions must be considered. Here, column length, diameter, and film thickness are the key parameters. In this article we turn our attention to the column internal diameter and its relevance.
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Impact of the GC Parameters on the Separation—Part 3: Choice of Column Length

In parts 1 and 2 of this series we focused on selection of stationary phase and looked at different applications for using different internal diameter. Capillary columns are also available in different length. Here, we look at the third parameter: column length. What is the impact of column length on the separation? If length is changed, what do I have to do to get the results that I anticipate?
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Impact of the GC Parameters on the Separation—Part 4: Choice of Film Thickness

In parts 1–3 of this series, we focused on the selection of stationary phase, column length, and internal diameter. The stationary phase is deposited as a film or a layer and its thickness is the fourth parameter we need to understand that impacts the separation. The thickness of the layer determines the amount of the stationary phase that is present in the capillary. Retention is directly related to the amount of the stationary phase; thicker films equal more retention. When do we choose thin or thick films and how do they impact the chromatography? Changing film thickness will impact several parameters: retention, loadability, bleed, efficiency, and even inertness.
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Impact of the GC Parameters on the Separation—Part 5: Choice of Column Temperature

In parts 1–4 of this series, we focused on the selection of stationary phase, column length, column ID, and the film thickness. Besides the column-specific parameters, there are three non-column specific parameters that impact the separation. These are the type of carrier gas, its linear velocity, and the temperature of the column. Here we look into the effects of temperature on separations.
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Impact of the GC Parameters on the Separation—Part 6: Choice of Carrier Gas and Linear Velocity

In parts 1–5 of this series, we focused on the selection of the column dimensions and stationary phase. We also saw that temperature has a big impact on chromatography. The last two factors to consider, which are somewhat related, are the choice of carrier gas and the setting of carrier gas linear velocity.
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Inlet Supplies for Agilent GCs With Split/Splitless Inlet

A quick reference for ordering the top-quality supplies you need to service and maintain your GC inlet. (PDF - 2085kB)
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Inlet Supplies for Gerstel CIS4 (PTV) Inlet

Inlet Supplies for Gerstel CIS4 (PTV) Inlet (PDF - 2226kB)
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Inlet Supplies for PerkinElmer GCs With CAP Inlet

A quick reference for ordering the top-quality supplies you need to service and maintain your GC inlet. (PDF - 2113kB)
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Inlet Supplies for Shimadzu GCs With Split/Splitless Inlet

A quick reference for ordering the top-quality supplies you need to service and maintain your GC inlet. (PDF - 2092kB)
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Inlet Supplies for Thermo TRACE 1300/1310 GCs

Septa, O-rings, inlet liners, and seals—all tailored to your Thermo TRACE 1300/1310 inlet. (PDF - 2077kB)
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Inlet Supplies for Thermo TRACE Ultra GCs

A quick reference for ordering the top-quality supplies you need to service and maintain your GC inlet. (PDF - 2084kB)

It’s A Matter of Degrees, but Do Degrees Really Matter?

Injecting a liquid sample into a hot GC inlet is a dynamic and complex event. Of the many parameters that affect the success of an injection, inlet temperature is one of the most significant. Raising or lowering the inlet temperature setpoint can have a profound effect on how much sample is transferred onto the column depending on sample volatility and thermal sensitivity. But, once the inlet temperature is set, how much of the inlet is actually kept at that setpoint? Moreover, how might thermal profiles change between inlets?

LC Method Translation: Will Switching Column Dimensions Speed Up Sample Analyses?

Switching a method to a smaller column format can save time, solvent, and sample, but proper LC method translation is essential. Pro EZLC method translation software makes it easy to test different scenarios and ensure success.

Leak Checking a GC System

Analysts should use an electronic leak detector when installing a new column or fitting, changing a cylinder, or troubleshooting the system. The portable, reliable, easy-to-use Restek Electronic Leak Detector reveals minute leaks without contaminating the system.
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ライナーの手引き

役に立つGCライナーセレクションガイドは、簡単で、有益な比較ーライナーの充填物の選択肢や形状、サイズと同様に注入法のタイプやどうやってライナーを選択するかが述べられています。どのライナーが適しているか、簡単・迅速に選択する際のヒントになるようお手元にお持ちください。 (PDF - 0kB)

メソッド開発とカラム選択:FluoroPhenyl固定相は
どのようにHILIC・逆相の両モードで作用するのか

難しい分離がうまくいくかどうかはカラムの保持と選択性によって大きく左右されるため,カラム選択はメソッド開発において重要です。一般的にはC18カラムが使用されますが,FluoroPhenylカラムはメソッド開発に全く異なる選択性をもたらします。これは,FluoroPhenylに複数の保持機構が組み込まれており,逆相モードと親水性相互作用クロマトグラフィー(HILIC)モードの両方で利用できるためです。ここでは,塩基性化合物や低分子極性化合物のように特にC18で分離が難しい化合物に対して,FluoroPhenylがどのように分離を改善するのかをご紹介します。
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More of What You Need to Keep Your LC Flowing: Fittings, tubing, mobile phase management & safety, and more.

Browse top-quality couplers, fittings, unions, tees, and crosses; PEEK and stainless steel tubing; mobile phase maintenance and safety products including bottle tops, valves, filters, and spargers—and that’s on top of our already wide selection of instrument replacement parts and supplies. Don’t stop at the column, outfit your entire LC system with Restek LC products. (PDF - 3764kB)
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Multi-task with an Ultra IBD Column

The Ultra IBD is an extremely versatile HPLC column. It offers alternate selectivity, and a high degree of both polar and nonpolar retention, making it a powerful tool for analyzing a wide range of compounds. (PDF - 130kB)
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MXT Columns: The Perfect Solution for Portable, Process, and High-Temperature GC Analysis

Stainless steel MXT columns are your best choice for high temperature chromatography or any other situation where the potential for column breakage is too high to rely on fused silica. For field instruments, process GCs, GCs with small ovens, and more, reach for robust Restek MXT columns! (PDF - 4057kB)
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New Thermolite Plus and BTO Septa from Restek

Restek’s new Thermolite Plus septa offer advanced technology for optimal performance. The ultra-low bleed characteristic of these new septa minimizes the background signal, and the plasma coating prevents the septa from sticking in the injection port. Precision molding ensures a consistent, accurate fit. In addition, select Thermolite Plus septa feature a CenterGuide design to minimize coring. (PDF - 705kB)
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Outfit Your Agilent MSDs with Restek Chromatography Supplies

Outfit your Agilent MSDs with Restek chromatography supplies including high-temp EI filaments; fittings, connectors, nuts & transfer lines; ETP electron multipliers; pump oil & cleaning powders; and more. (PDF - 0kB)
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Parker Balston FID Gas Stations

Parker Balston FID gas stations produce 99.9995% hydrogen from deionized water and UHP zero air (<0.1 ppm hydrocarbons) from house compressed air, eliminating inconvenient, costly, hazardous cylinders. The note describes models available from Restek. (PDF - 0kB)
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Parker Balston Hydrogen Generators

Replace inconvenient, costly, hazardous gas cylinders with a safe, reliable Parker Balston hydrogen generator that produces 99.9995% pure hydrogen from deionized water at up to 510 cc/minute. This note describes all models available from Restek. (PDF - 0kB)
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Parker Balston Zero Air Generators

Eliminate the inconveniences, costs, and hazards of gas cylinders – reliable Parker Balston zero air generators produce UHP zero air (<0.1 ppm hydrocarbons) from house compressed air. This note describes all models available from Restek. (PDF - 0kB)
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Peak Tailing in GC Trace Analysis

In chromatography the analysis methods are becoming more and more challenging. Lower detection limits are required, especially if quantification is required at trace levels. As soon as activity develops in a GC system, the first components that start to lose response will be ones that have polar functionality. These can be hydroxyl, amine, or carboxyl groups or combinations. Peaks usually start to tail and retention times can even change.
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Preventing GC Septum Problems

Handy tips for choosing the right septum for your application and instrument. Includes an overview of common GC septum problems including coring and bleed. Guidelines help you avoid extraneous peaks and optimize your system’s performance.

ProFLOW 6000 Electronic Flowmeter—Frequently Asked Questions (FAQ)

Wondering why you are seeing differences in flowmeter readings or trying to change gas flow units? You’ll find answers to these and other frequently asked questions on our ProFLOW 6000 electronic flowmeter FAQ page.

Reducing Column Internal Diameter

Scaling down column size is simple to do and can help reduce solvent use. Here is an easy-to-follow example that teaches you how to reduce column internal diameter.
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Resprep VM-96 Vacuum Manifold

Designed for performance, versatility, ergonomics, and accuracy, Restek’s Resprep VM-96 vacuum manifold is perfect for everyday laboratory applications, including SPE, SLE, PPT, and filtration. Features include a heavy-duty, metal body that keeps the unit in place; precision-manufactured parts that assemble quickly and easily; a viewing window that allows easy observation of plate height and drip rate; durable O-ring and gaskets that provide leak-free seals time after time; and a precision height adaptor and five shims so users can customize plate height to their exact requirements. (PDF - 0kB)

Restek Coated Blade Spray (CBS) Technology – Redefining Rapid-Screening Analysis

Restek is redefining rapid screening with coated blade spray (CBS) technology. The blade is an easy sample prep device that couples to a mass spec for qualitative or semiquantitative analysis without chromatography.
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Restek GCxGC Columns: Your One Source for 2D Gas Chromatography

Restek is your one source for 2D gas chromatography! Also known as GCxGC, 2D gas chromatography is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. By choosing a primary and a secondary column with differing (orthogonal) stationary phases, it is possible to identify analytes using comprehensive two-dimensional gas chromatography that simply cannot be separated through standard one-dimensional GC. (PDF - 0kB)
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Restek GCxGC Columns: Your One Source for 2D Gas Chromatography

Restek GCxGC Columns: Your one source for 2D gas chromatography! GCxGC is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. By choosing a primary and a secondary column with differing (orthogonal) stationary phases, it is possible to identify analytes using comprehensive two-dimensional gas chromatography that simply cannot be separated through standard one-dimensional GC. (PDF - 0kB)
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Restek LC Columns and Accessories

Our state-of-the-art, high-quality lines of LC columns—Raptor, Force, and Roc—with industry-leading stationary phases undergo extensive testing, competitor benchmarking, and strict QC systems to ensure all of our columns consistently produce the results you need. Restek also offers instrument replacement parts that meet or even exceed the original manufacturer’s performance. (PDF - 17384kB)

Restek LC ガードカラムセレクター:
適切なガードを迅速に見つける方法

LCガードカラムの選択は、技術と分離カラムに基づいて決定する場合、簡単な作業です。 セレクションガイドを使用して、セットアップに最適なLCガードをすばやく見つけてください。信頼性の高い保護と分離カラムの最適なパフォーマンスが得られ、さらにの多くの分析が可能になります。

Restek Liquid Chromatography (LC) Columns — Cleaning Recommendations

Even when using guard columns, your LC column may become blocked or contaminated by strongly adsorbed sample components. If you observe decreased column performance, increased backpressure, or other signs of blockage or column contamination, these LC column regeneration steps may help restore your column.

Routine LC Maintenance: Simple Steps to Preventing Unexpected Downtime

Routine LC maintenance will keep your instrument performing well and minimize downtime for unexpected repairs. In this article, we explore how to develop an effective preventative maintenance plan.
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Routine Maintenance for Agilent 1100 and 1200 HPLC Systems

Keep Your Lab Flowing With RM on Your Agilent 1100 & 1200 HPLC Systems Routine maintenance (RM) reduces downtime and protects your valuable analytical data. Use this guide to keep your Agilent 1100 and 1200 HPLC Systems operating at their best—replace these crucial components at the recommended intervals and keep extras on hand. (PDF - 574kB)
PDF Document

Routine Maintenance for Shimadzu HPLC Systems

Keep Your Lab Flowing with RM on Your Shimadzu HPLC Systems Routine maintenance (RM) reduces downtime and protects your valuable analytical data. Use this guide to keep your Shimadzu HPLC Systems operating at their best—replace these crucial components at the recommended intervals and keep extras on hand. (PDF - 440kB)
PDF Document

Routine Maintenance for Waters ACQUITY LC Systems

Keep Your Lab Flowing with RM on Your Waters ACQUITY LC Systems Routine maintenance (RM) reduces downtime and protects your valuable analytical data. Use this guide to keep your Waters ACQUITY LC Systems operating at their best—replace these crucial components at the recommended intervals and keep extras on hand. (PDF - 449kB)
PDF Document

Routine Maintenance for Waters Alliance HPLC Systems

Keep Your Lab Flowing with RM on Your Waters Alliance HPLC Systems Routine maintenance (RM) reduces downtime and protects your valuable analytical data. Use this guide to keep your Waters Alliance HPLC Systems operating at their best—replace these crucial components at the recommended intervals and keep extras on hand. (PDF - 457kB)
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Same Separation, Speedier Solution

Designed with GC-MS users in mind, the GC Accelerator kit provides a simple way to speed up sample analysis. By reducing oven volume, these inserts allow faster ramp rates to be attained, which reduces oven cycle time and allows for increased sample throughput and more capacity to process rush samples. When faster ramp rates are used, existing methods can be accurately scaled down to smaller, high-efficiency, narrow-bore columns using Restek’s EZGC method translator. With a scaled-down column, a properly translated method, and a GC Accelerator kit, you can obtain the same chromatographic separation—often with greater sensitivity—in a fraction of the time without making a capital investment. (PDF - 2184kB)

Set Your Sights on Superior Performance

The PAL SPME Arrow system is a revolutionary change in microextraction that combines exceptional robustness with faster extraction times and trace-level sensitivity. In contrast to traditional SPME fibers, SPME Arrows contain significantly more sorbent which allows more target analyte to be extracted in less time, significantly increasing sample throughput. In addition, the unique Arrow tip, inner stabilizing rod, and outer sheath design fully protect the sorbent, minimizing both and analyte loss and mechanical damage.
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Simplify Sample Prep and Protect Analytical Equipment With Syringe Filters

Filtering sample extracts with syringe filters will greatly extend the life of costly chromatographic columns and replacement parts, particularly for HPLC systems. This 2-page fact sheet includes helpful membrane, porosity, and size selection guides. (PDF - 0kB)
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Simplify Your Routine LC Maintenance with These Handy Kits for Agilent and Waters Systems

Simplify routine maintenance with these handy, cost-effective Restek LC kits for preventative maintenance. (PDF - 1109kB)

Solvent Compatibility Chart

Chemical Compatibility Chart for the Q-sep Bottle Top Solvent Dispenser (cat.# 23990)
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Speed Up and Simplify GC Method Development with the EZGC Online Software Suite

Now available in multiple languages, this new and improved version of our popular EZGC chromatogram modeler is just as simple to use as the original software, but it now offers advanced options for selecting phases, changing carrier gases and control parameters, further optimizing your results, and much more! Already a favorite of analysts around the world, the software was updated based on user feedback and now helps you develop and optimize methods more efficiently and effectively than ever before. In just seconds, you can generate a customized, interactive model chromatogram that matches real-world chromatograms with exceptional accuracy. (PDF - 0kB)
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Stabilwax-MS Columns—Thermally Stable, High Polarity GC Columns for Flavor, Food, Fragrance, Industrial Chemical, and Solvent Analyses

Low-bleed Stabilwax-MS columns produce excellent results for the analysis of trace levels of polar compounds by GC-MS. These columns are ideal for a wide range of polar analytes including FAMEs, flavor compounds, essential oils, solvents, aromatics, acrolein/acrylonitrile, and oxygenated compounds. (PDF - 0kB)

優れた不活性度は、精確な微量分析を保証します。

カラムの不活性度はなぜ重要なのか、Rxiカラムを使うことで結果がどのように改善されるのかを紹介します。

Tech Tip — Why do I Lose Retention on my C18 in Highly Aqueous Mobile Phases?

Learn what de-wetting is, and how to avoid it, by using an Aqueous C18 column, instead of a conventional C18, when analyzing polar compounds by HPLC.

カラム性能に対する粒子径の影響:
UHPLC用Raptor 1.8 µm 表面多孔性粒子(SPP)

表面多孔性粒子(一般にSPPもしくはコアシェルと呼ばれる)は、高速かつ効率的なLC分離能を有することが証明されています。この粒子は、薄い多孔性シリカで覆われた透過性のない固体のコアを特徴とし、全多孔性粒子(FPP)に比べてはるかに高いカラム効率と感度をもたらします。Raptor SPP LCカラムの発売当時は、その選択性や既存のHPLCシステムによる高速分離に役立つ性能をうたっていました。Raptor 1.8 μmカラムの発売により、Raptorのこの優れた性能はUHPLC分析へと広がりました。しかし、それはどういう意味を持つのでしょうか?このテクニカルノートでは、ピークキャパシティ、カラムの耐久性および選択性に焦点を当て、UHPLCシステムにおけるRaptor 1.8 μmカラムの利点を検証します。

The Effects of LC Particle Choice on Column Performance: Switching from 3 and 5 µm Fully Porous Particles (FPP) to
5 µm Superficially Porous Particles (SPP)

In this technical note, we will compare the performance of Raptor 5 µm superficially porous particle (SPP) LC columns to traditional 3 and 5 µm fully porous particle (FPP) LC columns. We will demonstrate how faster, more efficient analyses can be attained with greater sensitivity and reduced system pressure by switching from FPP to SPP—without altering method conditions.

The Effects of LC Particle Choice on Column Performance:
2.7 vs. 5 µm Diameter Superficially Porous Particles (SPP)

Restek's Raptor LC columns feature superficially porous particles (commonly referred to as SPP or “core-shell” particles) and are available in both 2.7 and 5 µm particle sizes, giving analysts greater flexibility. However, it may not always be clear which particle size to choose. In this technical note, we will examine the differences in efficiency, sensitivity, and pressure between Raptor LC columns packed with 2.7 vs. 5 µm particles and provide advice on making the appropriate LC particle choice
PDF Document

The Impact of Using Guard Columns in Gas Chromatography

Gas chromatography is a technique that can be used for a wide range of sample types. If the components to analyze can be transferred in the gas phase by increasing the temperature, then there is a high probability that they can be analyzed by gas chromatography.
Content previously published on www.sepscience.com. (PDF - 0kB)
PDF Document

Thermal Desorption: A Practical Applications Guide: II. Residual Volatiles & Materials Emissions Testing

Thermal desorption is a convenient, fully automated alternative to solvent extraction for measuring residual volatiles. This 32-page publication from Markes International Ltd. details the testing of a wide variety of products using thermal desorption. (PDF - 0kB)

Tips for Preparing Calibration Curve Standards and Avoiding Sources of Error

When preparing calibration curve standards, minimizing sources of error is vital for obtaining accurate quantitative results. This article shares best practices relating to equipment, chemical interactions, and workflow solutions that will help ensure accurate and precise analytical results.
PDF Document

Trident LC Column Protection System: Redesigned to be more rugged and easier to use!

Unlike “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. With three levels of protection and a variety of guard cartridges and cap frits, 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. (PDF - 1187kB)
PDF Document

UHPLC Filters: Protect Your Column and Chromatographic Performance

UltraShield UHPLC Precolumn Filter
Extend UHPLC column lifetime. Negligible effect on column performance.
Universal fit—easily connects directly to any brand column.
Leak tight to 15,000 psi (1,034 bar).
Does not contribute to system backpressure. Does not contribute to band broadening.

UltraLine UHPLC In-Line
Cost-effective protection for UHPLC systems. Installs quickly with standard UHPLC fittings. Includes replaceable filter element.
Low dead volume supports many applications.
Leak tight to 15,000 psi (1,034 bar). (PDF - 0kB)

Understanding Your Restek Reference Standard Certificate
of Analysis:

Restek’s Certificates of Analysis, or CofAs, offer comprehensive information to help you understand the composition, proper storage conditions, and method of shipment for your reference standard.

Using a Methanizer for CO and CO2 Analysis at Low Levels

Adding a methanizer to a GC-FID is an easy, effective, and cost-efficient way to analyze CO and CO2 at ppb levels. This article explains the technique and shares best practices for preventing problems and obtaining accurate results.

Using Micropacked Columns

Micropacked columns are 1-2 meter, 0.75-1.0mm ID packed stainless steel columns with performance characteristics intermediate between conventional packed columns and capillary columns. They are inexpensive, very durable, and easy to install and operate. They have a wide range of applications, but are especially useful for analyses of gas mixes, including sulfur compounds or light hydrocarbons, for which a packed column is needed to obtain baseline separations of sample components.
PDF Document

Vials Sales Sheet

Quickly and easily choose the right vials, caps, and inserts for your application, even headspace. (PDF - 0kB)

ウォーミングアップ

GCシステムのバックグラウンドノイズは、サンプル分析の前にシステムのコンディショニングをすることによって、低減することができます。このテクニカルノートでは、バックグラウンドピークを減らすためのシステムのコンディショニングの重要さをウォーミングアップの方法とライナーの使用方法と、据え付け法を紹介しています。また、少しの時間をコンディショニングに費やすことにより、よりよい分析結果を得られるTipを紹介しています。

Why Do Smaller Particle Size Columns Improve Resolution?

Smaller particle sizes have been shown to offer higher peak efficiencies, but how does this affect the resolution? In this article, we explore the impact that particle size has on the resolution equation, and how choosing the right size particle can lead to improved separations.

Will Pro EZGC Chromatography Modeling Software Work For You? We Put It to the Test!

When it comes to speeding up method development, Pro EZGC modeling software saves you time, materials, and a lot of frustration. This technical article puts Restek’s GC chromatogram simulator to the test and demonstrates how well it predicts actual experimental outcomes.

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