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News from LabRulezGCMS Library - Week 30, 2024

We, 31.7.2024
| Original article from: LabRulezGCMS Library
New posters from ASMS 2024 by LECO, Agilent Technologies, and Thermo Fisher Scientific and application notes from Shimadzu and Thermo Fisher Scientific in LabRulez Library.
<ul>
<li><strong>Photo:</strong> LabRulezGCMS Library</li>
</ul>
  • Photo: LabRulezGCMS Library

Our Library never stops expanding. What are the most recent contributions to LabRulezGCMS Library in the week of 22nd July 2024? Check out new documents from the field of the gas phase, especially GC and GC/MS techniques!

👉 SEARCH THE LARGEST REPOSITORY OF DOCUMENTS ABOUT GCMS AND RELATED TECHNIQUES

👉 Need info about different analytical techniques? Peek into LabRulezLCMS or LabRulezICPMS libraries.

This week we bring to you poster presentations from ASMS 2024 by LECO, Agilent Technologies, and Thermo Fisher Scientific! And as a bonus two application notes from Shimadzu and Thermo Fisher Scientific.

💡 + 100 ASMS posters and presentations available in the LabRulezGCMS library (unique search and filtering)

1. LECO: A Novel Long-Lifetime Ion Detector for GC-TOFMS and GCxGC-TOFMS with Sub-Femtogram Detection Limits

  • poster - ASMS 2024

Introduction: Ion detection efficiency and fast response times are critical aspects of the ion detectors used in time-of-flight mass spectrometry (TOFMS). With modern advancements in ionization, ion optics, and ion transfer efficiency, TOFMS systems are capable of generating high ion flux onto the ion detectors. Having an ion detector that is capable of maintaining optimal performance over a long period of time while accepting high amounts of ion flux is a significant challenge in development of TOFMS instrumentation. Improvements in detector life will minimize maintenance costs and improve TOFMS user experience. A novel long-lifetime ion detector was developed in partnership with El Mul Technologies for use in LECO’s Pegasus® BTX GC and GCxGCTOFMS. The system was thoroughly evaluated for sensitivity and robustness, including longevity of the detector.

Conclusions: The Pegasus BTX GC(GCxGC)-TOFMS with a novel Long-Lifetime Ion Detector has demonstrated the following performance characteristics:

  • Sub-2 fg IDL for GC-TOFMS and Sub-fg IDL for GCxGC-TOFMS
  • Linear dynamic range of 5 orders of magnitude in GC-TOFMS and 4 orders of magnitude in GCxGC-TOFMS
  • Robust operation: the detector bias remains consistent and BTX peak intensity remains consistent over long periods of time, even with large numbers of samples acquired and significant amounts of charge accumulation on the detector.

2. Thermo Fisher Scientific: Utilizing hydrogen carrier gas for sensitive analysis of pesticides in food using gas chromatography mass spectrometry

  • poster - ASMS 2024
Abstract

Purpose: To demonstrate the performance of the Thermo Scientifc HeSaverH2Safer kit for iConnect split-splitless (SSL) injection module for trace analysis of pesticides using H2 as a carrier gas as a safe and sustainable solution for laboratory operations.

Methods: In this study, hydrogen was used as a carrier gas for GC-MS/MS analysis of trace levels of pesticides in food. The GC was fitted with a new hydrogen safer split/splitless injector, with chromatographic separation performed on a TG-5 SIL MS(30 m × 0.25 mm, 0.25 μm) capillary GC column. The chromatographic conditions applied ensured critical pair separation was achieved. The GC-MS/MS system was equipped.

Conclusions
  • The use of the HeSaver-H2Safer technology allows for a safe and compliant use of hydrogen as an alternative carrier gas in GC/GC-MS applications without the need to install a hydrogen sensor and removes any risk of unwanted reactions with the sample in the hot SSL injector.
  • When used with hydrogen, the limited carrier gas consumption offered by the HeSaverH2Safer mode permits a very controlled system demand for hydrogen, making this solution ideal for laboratories working with hydrogen generators.
  • Migrating the GC-MS/MS method from helium to hydrogen requires an adaptation of method parameters to address (i.e., retention time shift and different fragmentation patterns).
  • 97% of pesticides in baby food and 98% in honey showed a linear response in the concentration range 0.005–0.500 mg/kg and the relative standard deviation for N=5 repeats of each sample type at 0.01 mg/kg was equal or lower than 10% for 98% of the evaluated compounds with an advanced electron ionization (AEI) source to increase sensitivity for analyte detection. Quantification and assessment of critical regulatory requirements, such as linearity and sensitivity, were performed in a single software.

3. Agilent Technologies: Analyzing Nitrosamines with Hydrogen Carrier Gas: GC/MS/MS Analysis of Nitrosamines in Sartan Drugs

  • Poster Reprint - ASMS 2024

Introduction: The limited availability of helium has been a concern, leading to a growing interest in switching to alternative carrier gases like hydrogen. Hydrogen offers several advantages over helium1 , including faster run times and improved chromatographic resolution. Helium is commonly used as a carrier gas for analyzing nitrosamine impurities in pharmaceuticals. However, there are concerns that nitrosamines may react with hydrogen, forming unwanted byproducts. To ensure that using hydrogen as a carrier gas does not impact spectral quality, we evaluated its suitability for analyzing eight impurities:

  • N-nitrosodimethylamine (NDMA),
  • N-nitrosomethylethylamine (NMEA),
  • N-nitrosodiethylamine (NDEA),
  • N-nitroso-ethylisopropylamine (NEIPA),
  • N-nitrosodiisopropylamine (NDIPA),
  • N-Nitrosodipropylamine (NDPA),
  • N-nitrosodi-n-butylamine (NDBA),
  • N-Nitrosopiperidine (NPIP).

Hydrogen carrier gas was used with the 7000E and 7010 Series GC/TQ systems equipped with the HydroInert and HES ion sources respectively, assessing spectral quality, linearity, repeatability, recovery, and compliance with nitrosamine analysis regulations.

MassHunter 13 software suite provided the tools for data acquisition and processing to be performed under a unified compliance environment. OpenLab Electronic Content Management (ECM) XT includes native tools to facilitate compliance, including the ability to create users with affiliated permissions, the generation of audit trails, and remote data storage.

Conclusions:

  • The 7000E and 7010 Series GC/TQ systems equipped with the HydroInert and HES, respectively, exhibited exceptional performance in determining eight nitrosamine drug impurities in sartan drug products and substances using hydrogen carrier gas.
  • The method was validated at 30 ppb with acceptable recovery and long-term repeatability.
  • The 7010 Series GC/TQ system enabled a smooth switch between helium and hydrogen carrier gas without compromising the performance of the methods.
  • Both the HydroInert and the HES sources facilitated achieving the necessary detection limits for the tested impurities.

4. Agilent Technologies: Analysis of Essential Oils Using a Comprehensive GCxGC with a Reverse Flow Modulator Combined with High Resolution GC/MS

  • Poster Reprint - ASMS 2024

Introduction: Essential oils are typically analyzed to determine their chemical composition contributing to flavor and quality as well as to evaluate their authenticity and identify adulterants. Essential oils are often complex samples with high number of volatile and semi-volatile components that include many isomers with highly similar spectra and close Retention Indices (RIs) when separated on a single column. Hence, a comprehensive GCxGC approach is preferable to achieve an appropriate chromatographic separation for this sample matrix. In this study we used comprehensive GCxGC coupled to a high-resolution accurate mass GC/MS to identify the essential oil components. Here we also investigate approaches for comparison of the complex GCxGC essential oil data.

Conclusions:

  • Several comprehensive GCxGC configurations and method using the high-resolution GC/Q-TOF and RFM were developed and optimized using a diesel sample.
  • Essential oils were analyzed using the optimized GCxGC approach, and the workflows for compound identification and statistical analysis were evaluated.

5. Shimadzu: Greenhouse Gas Analyzer

  • Application

User Benefits:

  • Simultaneously measures the 3 main greenhouse gases: CH₄, CO₂, and N₂O.
  • Offers short analysis cycle times and is equipped with an AOC-6000 Plus syringe injection system to analyze large numbers of samples.
  • Uses nitrogen as a carrier gas for lower running costs.

Introduction: Greenhouse gases are a major cause of climate change, and carbon dioxide, (CO₂), methane (CH₄), and nitrous oxide (N₂O) are considered the 3 primary greenhouse gases. Although CO₂ accounts for the majority of greenhouse gas emissions followed by CH₄, reducing CH₄ emissions is considered important because CH₄ has a warming effect that is more than twenty times greater than CO₂. At the United Nations Climate Change Conference (COP26) in November 2021, over 100 countries joined the Global Methane Pledge, which pledges by 2030 to reduce global CH₄ emissions by 30 % compared to 2020 levels. The Greenhouse Gas Analyzer is a gas chromatography system that has been developed by Shimadzu in collaboration with the National Agriculture and Food Research Organization (NARO) (Fig. 1). Measuring levels of CH₄, CO₂, and N₂O simultaneously in a single sample is difficult, but the Greenhouse Gas Analyzer has been designed to do this simultaneously, which reduces analytical errors and improves the sampling speed, giving researchers a valuable tool in reducing greenhouse gas emissions.

This Application News describes using the Greenhouse Gas Analyzer to simultaneously measure CO₂, CH₄, and N₂O levels.

Conclusion: The Greenhouse Gas Analyzer can simultaneously measure 3 greenhouse gases in atmospheric air in a single analysis. Each analysis by the Greenhouse Gas Analyzer is performed in 8 minutes with an analysis cycle time of 10 minutes.

6. Thermo Fisher Scientific: An automated approach for the analysis of VOCs in drinking and surface water by using the TriPlus RSH SMART VOC Sample Prep Station

  • Application - Environmental

Goal: The aim of this study is to demonstrate the suitability of the Thermo Scientific™ TriPlus™ RSH SMART VOC Sample Prep Station for the analysis of volatile organic compounds (VOCs) in drinking and surface water by using a fully automated sample preparation workflow.

Keywords: Automated sample preparation, TriPlus RSH SMART Sample Prep Station, volatile organic compounds, VOCs, drinking water, surface water, gas chromatography, TRACE 1610 GC, single quadrupole mass spectrometry, ISQ 7610 GC-MS.

Conclusions: The results of these experiments demonstrate that the automated sample preparation capability of the TriPlus RSH SMART VOC Sample Prep Station coupled to the ISQ 7610 GC-MS system provides an ideal solution for water testing laboratories looking to improve productivity and deliver confident results.

  • Static headspace is a convenient solventless extraction technique for volatiles in water with almost no sample preparation required.
  • Unattended operations of up to 210 samples can be achieved with the automated calibration dilution and ISTD addition workflows.
  • The automated addition of fresh reagent just before the incubation increases the stability of ISTD/surrogates mix, therefore improving the accuracy of the quantitation of target analytes during data reprocessing.
  • The TriPlus RSH SMART VOC Sample Prep Station ensures increased sample integrity for highly reliable quantitative analysis, and reduced errors or possible cross-contaminations, maximizing the productivity of the laboratory. Additionally, it allows saving valuable analyst time and improving safety by limiting the user’s exposure to toxic chemicals.
  • The integrated control for both autosampler and GC-MS in a single CDS ensures a streamlined automated workflow from on-line sample preparation to sequence setup, data acquisition, and reporting.
  • Suitability of headspace sampling for analysis of VOCs was demonstrated with R2 > 0.990, RRF %RSD < 20%, and calculated amount within 20% of the spiked concentration.
  • Inter-day reproducibility was demonstrated by running three batches of samples bracketed with QCs. Average absolute peak area %RSD across the entire evaluation period was <20%, the QC calculated amount was within 20% of the expected value, and the calculated recovery was within 70–130%, with the only exception of 1,2-dibromo-3-chloropropane for which the % recovery was 132.
  • Reliable quantitative analysis was achieved for drinking water samples and surface water samples analyzed in three different batches across six working days. All the sample results were compliant with the thresholds set by the current EU regulation.
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